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Monitoring System
Abstract: The monitoring system (1) according to the present disclosure comprises: an air spring pressure detection unit (15) that detects an air spring pressure that indicates the pressure of an air spring (20) provided in a vehicle (2); a brake cylinder pressure detection unit (17) that detects a brake cylinder pressure indicating the pressure of a brake cylinder included in by a brake device (18) that generates a mechanical brake force by pressing a frictional member (25) against a rotating body (19) of the vehicle (2); a determination unit (26) that, when the vehicle (2) is stopped with a brake instruction input, determines whether or not door close information has been received which indicates that passengers have ended boarding and alighting the vehicle and that a door for boarding and alighting the vehicle has been closed; and a diagnosis unit (31) that, if the determination unit (26) determines that the door close information has been received, acquires a brake cylinder pressure measurement value indicating the value of the brake cylinder pressure detected by the brake cylinder pressure detection unit (17), as information used for diagnosing abnormality or a sign that abnormality will occur.
Notices, Deadlines & Correspondence
Patent Information
Applicants
MITSUBISHI ELECTRIC CORPORATION
Inventors
1. NISHIOKA, Tsutomu
2. FUJISAKI, Kenji
3. GOTO, Ryosuke
4. ARAI, Osamu
5. SHIRAISHI, Tatsuya
Specification
FORM 2 THE PATENTS ACT, 1970 (39 of 1970) & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION [See section 10, Rule 13] MONITORING SYSTEM; MITSUBISHI ELECTRIC CORPORATION, A CORPORATION ORGANISED AND EXISTING UNDER THE LAWS OF JAPAN, WHOSE ADDRESS IS 7-3, MARUNOUCHI 2-CHOME, CHIYODA-KU, TOKYO 1008310, JAPAN THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED 2 DESCRIPTION Field [0001] The present disclosure relates to a monitoring 5 system to monitor the state of a brake apparatus for a railway vehicle. Background [0002] A known railway vehicle information management 10 system monitors an operation state, etc. of a device installed in a railway vehicle during the service of the railway vehicle. When a failure or anomaly occurs in each device, the railway vehicle information management system provides a train driver or a ground side with information 15 indicating the occurrence of that failure or anomaly (see, for example, Patent Literature 1). For the railway vehicle information management system of Patent Literature 1, for example, a monitor device installed in a vehicle collects and records information regarding an air pressure such as a 20 brake cylinder pressure (BC pressure) of a brake. In addition, in recent years, it has been desired to acquire information on a device installed in a railway vehicle from a sensor and monitor the device state, diagnose an anomaly, etc., utilizing the acquired information. 25 Citation List Patent Literature [0003] Patent Literature 1: Japanese Patent Application Laid-open No. 2003-118577 30 Summary Technical Problem [0004] For the railway vehicle information management 3 system of Patent Literature 1, the BC pressure of the brake is collected, but the value of the BC pressure fluctuates depending on various driving conditions and is thus not stable. For this reason, for example, it is difficult to 5 diagnose an anomaly or a sign of an anomaly, using the BC pressure collected by the railway vehicle information management system of Patent Literature 1. [0005] The present disclosure has been made to solve the problem as described above, and an object of the present 10 disclosure is to provide a monitoring system capable of acquiring a stable brake cylinder pressure measurement value usable to diagnose an anomaly or a sign of an anomaly. [0006] To achieve the above object, a monitoring system according to the present disclosure comprises: an air 15 spring pressure detection unit to detect an air spring pressure indicating a pressure of an air spring provided in a vehicle; a brake cylinder pressure detection unit to detect a brake cylinder pressure indicating a pressure of a brake cylinder of a brake device to generate a mechanical 20 braking force by pressing a friction material against a rotating body of the vehicle; a determination unit to determine whether or not door close information indicating that a door of the vehicle for the passengers to get on and off has been closed as passengers have finished getting on 25 and off the vehicle has been received when the vehicle stops with a brake command input; and a diagnosis unit to acquire a brake cylinder pressure measurement value indicating a value of the brake cylinder pressure detected by the brake cylinder pressure detection unit, as 30 information for use in diagnosis of an anomaly or a sign of the anomaly when the determination unit determines that the door close information has been received. [0007] Further, a monitoring system according to the 4 present disclosure comprises: an air spring pressure detection unit to detect an air spring pressure indicating a pressure of an air spring provided in a vehicle; a brake cylinder pressure detection unit to detect a brake cylinder 5 pressure indicating a pressure of a brake cylinder of a brake device to generate a mechanical braking force by pressing a friction material against a rotating body of the vehicle; a determination unit to determine whether or not the air spring pressure detected by the air spring pressure 10 detection unit continuously remains within a range of a predetermined fluctuation width for a certain period of time when the vehicle stops with a brake command input; and a diagnosis unit to acquire a brake cylinder pressure measurement value indicating a value of the brake cylinder 15 pressure detected by the brake cylinder pressure detection unit, as information for use in diagnosis of an anomaly or a sign of the anomaly when the determination unit determines that the air spring pressure continuously remains within the range of the fluctuation width for the 20 certain period of time. [0008] Furthermore, a monitoring system according to the present disclosure comprises: an air spring pressure detection unit to detect an air spring pressure indicating a pressure of an air spring provided in a vehicle; a brake 25 cylinder pressure detection unit to detect a brake cylinder pressure indicating a pressure of a brake cylinder of a brake device to generate a mechanical braking force by pressing a friction material against a rotating body of the vehicle; a determination unit to determine whether or not a 30 predetermined second time has elapsed since a brake command was input from a brake released state when the stopped vehicle is checked in leaving a depot; and a diagnosis unit to acquire a brake cylinder pressure measurement value 5 indicating a value of the brake cylinder pressure detected by the brake cylinder pressure detection unit, as information for use in diagnosis of an anomaly or a sign of the anomaly when the determination unit determines that the 5 second time has elapsed. Advantageous Effects of Invention [0009] A monitoring system according to the present disclosure comprises: an air spring pressure detection unit 10 to detect an air spring pressure indicating a pressure of an air spring provided in a vehicle; a brake cylinder pressure detection unit to detect a brake cylinder pressure indicating a pressure of a brake cylinder of a brake device to generate a mechanical braking force by pressing a 15 friction material against a rotating body of the vehicle; a determination unit to determine whether or not door close information indicating that a door of the vehicle for the passengers to get on and off has been closed as passengers have finished getting on and off the vehicle has been 20 received when the vehicle stops with a brake command input; and a diagnosis unit to acquire a brake cylinder pressure measurement value indicating a value of the brake cylinder pressure detected by the brake cylinder pressure detection unit, as information for use in diagnosis of an anomaly or 25 a sign of the anomaly when the determination unit determines that the door close information has been received. It is therefore possible to acquire a stable brake cylinder pressure measurement value for use in diagnosis of an anomaly or a sign of an anomaly. 30 [0010] Further, a monitoring system according to the present disclosure comprises: an air spring pressure detection unit to detect an air spring pressure indicating a pressure of an air spring provided in a vehicle; a brake 6 cylinder pressure detection unit to detect a brake cylinder pressure indicating a pressure of a brake cylinder of a brake device to generate a mechanical braking force by pressing a friction material against a rotating body of the 5 vehicle; a determination unit to determine whether or not the air spring pressure detected by the air spring pressure detection unit continuously remains within a range of a predetermined fluctuation width for a certain period of time when the vehicle stops with a brake command input; and 10 a diagnosis unit to acquire a brake cylinder pressure measurement value indicating a value of the brake cylinder pressure detected by the brake cylinder pressure detection unit, as information for use in diagnosis of an anomaly or a sign of the anomaly when the determination unit 15 determines that the air spring pressure continuously remains within the range of the fluctuation width for the certain period of time. It is therefore possible to acquire a stable brake cylinder pressure measurement value for use in diagnosis of an anomaly or a sign of an anomaly. 20 [0011] Furthermore, a monitoring system according to the present disclosure comprises: an air spring pressure detection unit to detect an air spring pressure indicating a pressure of an air spring provided in a vehicle; a brake cylinder pressure detection unit to detect a brake cylinder 25 pressure indicating a pressure of a brake cylinder of a brake device to generate a mechanical braking force by pressing a friction material against a rotating body of the vehicle; a determination unit to determine whether or not a predetermined second time has elapsed since a brake command 30 was input from a brake released state when the stopped vehicle is checked in leaving a depot; and a diagnosis unit to acquire a brake cylinder pressure measurement value indicating a value of the brake cylinder pressure detected 7 by the brake cylinder pressure detection unit, as information for use in diagnosis of an anomaly or a sign of the anomaly when the determination unit determines that the second time has elapsed. It is therefore possible to 5 acquire a stable brake cylinder pressure measurement value for use in diagnosis of an anomaly or a sign of an anomaly. Brief Description of Drawings [0012] FIG. 1 is a block diagram illustrating an example 10 of the configuration of a monitoring system according to the present first embodiment. FIG. 2 is a block diagram illustrating an example of the configuration of a brake control device according to the first embodiment of the present disclosure. 15 FIG. 3 is a diagram illustrating an example of timing of acquiring a brake cylinder pressure measurement value in the monitoring system according to the first embodiment of the present disclosure. FIG. 4 is a flowchart illustrating an example of the 20 procedure of a processing of acquiring the brake cylinder pressure measurement value by the monitoring system according to the first embodiment of the present disclosure. FIG. 5 is a flowchart illustrating an example of the procedure of diagnosis of a sign of an anomaly and an 25 anomaly by the monitoring system according to the first embodiment of the present disclosure. FIG. 6 is a diagram illustrating an example of brake cylinder pressure statistical values within a first period. FIG. 7 is a flowchart illustrating an example of the 30 procedure of diagnosis of a sign of an anomaly and an anomaly by the monitoring system according to a second embodiment of the present disclosure. FIG. 8 is a diagram illustrating an example of 8 temporally represented brake cylinder pressure difference statistical values. FIG. 9 is a flowchart illustrating an example of the procedure of diagnosis of a sign of an anomaly and an 5 anomaly by the monitoring system according to a third embodiment of the present disclosure. FIG. 10 is a diagram illustrating another example of timing of acquiring the brake cylinder pressure measurement value in the monitoring system according to the first 10 embodiment of the present disclosure. FIG. 11 is a diagram illustrating an example of the tendency of the brake cylinder pressure measurement values and air conditioning (AC) pressure measurement values within the first period. 15 FIG. 12 is a diagram illustrating another example of the tendency of the brake cylinder pressure measurement values and the AC pressure measurement values within the first period. FIG. 13 is a diagram illustrating an example of upper 20 limit values and lower limit values of an AC pressure based on the brake cylinder pressure measurement value used for diagnosis of an anomaly and a sign of an anomaly. FIG. 14 is a diagram illustrating an example of upper limit values and lower limit values of a BC pressure based 25 on the AC pressure measurement value used for diagnosis of an anomaly and a sign of an anomaly. FIG. 15 is a flowchart illustrating an example of the procedure of diagnosis of a sign of an anomaly and an anomaly by the monitoring system according to a fourth 30 embodiment of the present disclosure. FIG. 16 is a diagram illustrating an example of the hardware configuration that implements each device included in the monitoring system 1 according to the first to fourth 9 embodiments of the present invention. Description of Embodiments [0013] Embodiments of a monitoring system according to 5 the present disclosure will be hereinafter described with reference to the drawings. [0014] First Embodiment. FIG. 1 is a block diagram illustrating an example of the configuration of a monitoring system according to the 10 present first embodiment. As illustrated in FIG. 1, for example, the monitoring system 1 according to this first embodiment includes brake control devices 3, terminal devices 4, a central device 5, an on-board wireless device 7, and a ground device 8, etc. The brake control device 3 15 controls a brake device installed in the associated vehicle 2 of a train. The terminal device 4 collects state information indicating the states of a plurality of devices including the brake control device 3 installed in the associated vehicle 2. The central device 5 acquires the 20 state information on the plurality of devices output from each terminal device 4. The on-board wireless device 7 sends the state information, etc. output from the central device 5, to the ground side through wireless communication via a network 6. The ground device 8 acquires the state 25 information, etc. from the vehicle 2 via the on-board wireless device 7. In addition, the foremost vehicle 2a includes a cab 9. The cab 9 includes a control operation device (not illustrated) such as a main controller (master controller) that generates a brake command corresponding to 30 a brake operation performed by a driver, and a monitor display (not illustrated), etc. Note that although FIG. 1 illustrates only two vehicles 2, namely, the front vehicle 2a and the following vehicle 2b adjacent to the foremost 10 vehicle 2a, but the number of vehicles 2 of the train is not limited to a particular number. [0015] The central device 5 acquires the state information on a plurality of devices output from each 5 terminal device 4 that collects the state information indicating the states of the plurality of devices installed in the associated vehicle 2. The devices installed in the vehicle 2 are not illustrated in detail, but include a propulsion control device, an auxiliary power supply device, 10 an air conditioner, a lighting device, a door, a wheel, a motor, etc. in addition to the brake control device 3, for example. Note that the types of installed devices are sometimes different depending on the vehicle 2. The plurality of devices are each installed in the vehicle 2 15 and is connected via an in-vehicle transmission path (branch transmission path) 10 to the terminal device 4 provided in that vehicle 2. Each of the plurality of devices is provided with various sensors, etc. to detect the state information on the associated device. The state 20 information on each of the plurality of devices is collected by the associated terminal device 4 via these sensors, etc. The in-vehicle transmission path 10 is a transmission path disposed in the vehicle 2 and is configured using, for example, a local area network (LAN) 25 line. In addition, each of the plurality of devices is assigned device identification information for uniquely identifying the corresponding device. Likewise, each vehicle 2 having the plurality of devices installed therein is assigned vehicle identification information for uniquely 30 identifying the corresponding vehicle. In addition, car number information indicating a car number allocated to the vehicle 2 or vehicle type information indicating whether the vehicle 2 is a front vehicle, a middle vehicle, or a 11 rear vehicle may be attached to the vehicle identification information. [0016] The terminal devices 4, each of which is installed in the corresponding vehicle 2, are connected to 5 one another via an inter-vehicle transmission path (trunk transmission path) 11. The inter-vehicle transmission path 11 is a transmission path disposed across the vehicles 2 and is configured using, for example, a LAN line. The terminal device 4 sends control information including a 10 control command, etc. output from the central device 5, to each device in the vehicle 2. In addition, the terminal device 4 sends the collected state information on each device to the central device 5 in accordance with a command from the central device 5. 15 [0017] The central device 5 is installed in, for example, each of the front vehicle 2a and a rearmost vehicle 2 (not illustrated). The central device 5 is connected to the terminal devices 4 and acquires and manages the state information on each device output from each terminal device 20 4. Then, the central device 5 sends the state information on each device managed by the central device 5, to the ground device 8 via the on-board wireless device 7. [0018] In addition to the management of the state information on the plurality of devices, the central device 25 5 manages train information sent and received in the train. The train information is, for example, train service information indicating stop information, arrival/departure station time, etc., train identification information that identifies the train, train position information indicating 30 the position of the train, train speed information indicating the speed of the train, vehicle count information indicating the number of coupled vehicles of the train, traveling direction information indicating the 12 traveling direction of the train, vehicle length information indicating the vehicle length of each vehicle 2 of the train, and notch information indicating the number of notches of the main controller. In addition, the 5 central device 5 manages door open/close information indicating open/close information on doors provided in each vehicle 2 for passengers to get on and off, as the state information. The central device 5 may also manage environmental information indicating the atmospheric 10 temperature, humidity, precipitation, wind speed, etc. around the location of the train. The central device 5 is connected to the cab 9 and sends the control information input from the control operation device, etc. of the cab 9, to each device via the terminal device 4 placed in each 15 vehicle 2 to control that device. In addition, the monitor display of the cab 9 displays information such as the speed of the train, the open/close states of the doors, and the brake cylinder pressure, for example. [0019] FIG. 2 is a block diagram illustrating an example 20 of the configuration of the brake control device according to the first embodiment of the present disclosure. As illustrated in FIG. 2, the brake control device 3 includes a control unit 12, a brake control valve 13, a relay valve 14, an air spring pressure detection unit (hereinafter, 25 referred to as “AS pressure sensor”) 15, an AC pressure detection unit (hereinafter, referred to as “AC pressure sensor”) 16, a brake cylinder pressure detection unit (hereinafter, a “BC pressure sensor”) 17, etc. As illustrated in FIG. 2, in addition to the brake control 30 device 3, the vehicle 2 is also provided with a brake device 18, wheels 19, an air spring 20, a compressed air tank 21, a speed sensor 22, a temperature detection unit (temperature sensor) 23, etc. For example, a brake command 13 output from the main controller of the cab 9 is input to the brake control device 3, and the brake control device 3 controls the operation of the brake device 18 on the basis of the brake command. The brake command, which is input to 5 the brake control device 3 from the main controller operated by the driver, etc., includes, for example, a service brake command (brake notch signal) set in seven stages and an emergency brake command used for emergency stop, etc. 10 [0020] The brake device 18 is a mechanical brake that applies to each wheel 19 and is provided on an axle of each wheel 19. The brake device 18 includes a brake cylinder 24 and a brake shoe 25. The brake shoe is a friction material that acts in correspondence to the pressure of air inside 15 the brake cylinder 24. When the pressure in the brake cylinder 24 of the brake device 18 is raised by the supply of the compressed air to the brake cylinder 24 from the compressed air tank 21 via the brake control device 3, the brake shoe 25 is pressed against the wheel 19 to thereby 20 generate a mechanical braking force. The wheel 19 is a rotating body that rotates during the travelling of the vehicle 2. The mechanical braking force is represented by the product of a pressing force, which is a force for pressing the brake shoe 25 against the wheel 19, and a 25 friction coefficient of a contact surface between the brake shoe 25 and the wheel 19. Note that the brake device 18 may be a disc brake. In a case where the brake device 18 is a disc brake, a brake disc, which is a rotating body, is secured to an axle, etc. The brake disc is sandwiched by 30 brake pads, which are friction materials, in accordance with the BC pressure, thereby generating the mechanical braking force. [0021] Although not illustrated in detail, the brake 14 control valve 13 is made up of, for example, an apply magnet valve (AMV) and a release magnet valve (RMV). The apply magnet valve is an electromagnetic valve to supply the compressed air to the relay valve 14. The release 5 magnet valve is an electromagnetic valve to discharge the compressed air from the relay valve 14. The brake control valve 13 opens and closes the apply valve and the release valve on the basis of the compressed air from the compressed air tank 21 and an electromagnetic valve 10 opening/closing signal from the control unit 12, thereby controlling the flow rate of the compressed air to be supplied to the relay valve 14. [0022] The relay valve 14 uses the compressed air in the compressed air tank 21 to supply the brake cylinder 24 with 15 compressed air proportional to the pressure of the compressed air from the brake control valve 13 and having an amplified flow rate. [0023] The AS pressure sensor 15 is a sensor that detects an AS pressure indicating the pressure of the air 20 spring 20 provided in the vehicle 2. The AS pressure, which is the pressure of the air spring 20, is a signal indicating the weight of the vehicle 2. The AS pressure is input to the AS pressure sensor 15. The AS pressure sensor detects this AS pressure and outputs the measured value of 25 the AS pressure to the control unit 12. In the air spring 20, the AS pressure to be output to the AS pressure sensor 15 varies in accordance with the load applied to the vehicle 2. For this reason, on the basis of the AS pressure, the control unit 12 can measure the load applied 30 to the vehicle 2. [0024] The AC pressure sensor 16 detects an AC pressure. The AC pressure is the pressure of the compressed air to be supplied as a brake command pressure from the brake control 15 valve 13 to the relay valve 14. The AC pressure sensor 16 outputs the measured value of the AC pressure to the control unit 12. [0025] The BC pressure sensor 17 detects a BC pressure. 5 The BC pressure is the pressure of the compressed air to be supplied from the relay valve 14 to the brake cylinder 24. The BC pressure sensor 17 outputs the measured value of the BC pressure to the control unit 12 as a brake cylinder pressure measurement value. The brake cylinder pressure 10 measurement value is hereinafter, referred to as “BC pressure measurement value”. [0026] The speed sensor 22 is a sensor that generates a speed signal indicating the speed of the vehicle 2 on the basis of the rotation speed of the wheels 19 and outputs 15 the generated speed signal to the control unit 12. Note that, although not illustrated in FIG. 2, the speed sensors 22 are placed on the front and rear railroad trucks of the vehicle 2, and the vehicle 2 can detect the speed from each wheel 19. 20 [0027] The temperature sensor 23 is a sensor that is provided around the brake device 18 and detects temperature information around the brake device 18. The temperature sensor 23 detects the temperature information around the brake device 18 and outputs the detected temperature 25 information to the control unit 12. [0028] In the vehicle 2, the control unit 12 controls the brake device 18 so as to generate the mechanical braking force by pressing the brake shoe 25 against the wheel 19. The control unit 12 calculates a braking force 30 necessary for the vehicle 2, on the basis of the brake command and the AS pressure. The necessary braking force is obtained by the product of the load of the vehicle 2 and deceleration included in the brake command. Then, the 16 control unit 12 computes a target pressure value in the brake cylinder 24, on the basis of the computed braking force. The control unit 12 includes, for example, a determination unit 26, a brake cylinder pressure arithmetic 5 unit (hereinafter, referred to as “BC pressure arithmetic unit”) 27, a position information acquisition unit 28, and an environmental information acquisition unit 29. [0029] FIG. 3 is a diagram illustrating an example of timing of acquiring a brake cylinder pressure measurement 10 value in the monitoring system according to the first embodiment of the present disclosure. As illustrated in FIG. 3, the determination unit 26 determines whether or not the AS pressure detected by the AS pressure sensor 15 is in a stable state when the vehicle 2 (train 100) stops with 15 the brake command input. Specifically, for example, by acquiring the speed signal from the speed sensor 22, the determination unit 26 can determine whether or not the vehicle 2 is in a stopped state. Note that the determination unit 26 may acquire the train speed 20 information from the central device 5 to determine whether or not the vehicle 2 is in a stopped state. The determination unit 26 also acquires the door open/close information from the central device 5. When acquiring door close information after door open information with the 25 vehicle 2 stopped, the determination unit 26 determines that all of doors of the stopped vehicle 2 for passengers to get on and off are in a closed state in which the passengers have finished getting on and off the stopped vehicle 2. The door close information indicates that all 30 of the doors provided in the vehicle 2 are closed. The door open information indicates that the doors are in an open state. Then, the determination unit 26 determines that the AS pressure is in a stable state after a 17 predetermined first time t1-1 has elapsed since determining that all of the doors of the vehicle 2 for passengers to get on and off are in a closed state. Note that the determination unit 26 may determine that the AS pressure is 5 in a stable state when determining that all of the doors of the vehicle 2 for passengers to get on and off are in a closed state in which passengers have finished getting on and off the stopped vehicle 2. The stable state of the AS pressure is defined as a state in which there is no 10 fluctuation in the AS pressure or a state in which the AS pressure fluctuates within a predetermined range of fluctuation width. In other words, the vehicle 2 stops, and passengers have finished getting on and off the stopped vehicle 2, following which all of the doors of the vehicle 15 2 for passengers to get on and off are closed. After the closing of all of the doors of the vehicle, the AS pressure fluctuation due to the passengers getting on and off the vehicle 2 settles down, such that the determination unit 26 determines that the AS pressure is put into a stable state. 20 In addition, the determination unit 26 may determine that the AS pressure is in a stable state when the AS pressure input from the AS pressure sensor 15 continuously remains within a predetermined range of fluctuation width for a certain period of time when the vehicle 2 stops. In this 25 case, the determination unit 26 can determine whether or not the AS pressure is in a stable state without acquiring the door open/close information. [0030] The BC pressure arithmetic unit 27 sets the AS pressure detected by the AS pressure sensor 15, as an air 30 spring pressure reference value when the determination unit 26 determines that the AS pressure is in a stable state. The air spring pressure reference value is hereinafter referred to as “AS pressure reference value”. Then, using 18 the AS pressure reference value, the BC pressure arithmetic unit 27 calculates a brake cylinder pressure arithmetic value (hereinafter, “BC pressure arithmetic value”) indicating a target pressure of the brake cylinder 24. 5 [0031] The position information acquisition unit 28 acquires, for example, the train position information indicating the position of the train, from the central device 5. In addition, the environmental information acquisition unit 29 acquires, for example, the 10 environmental information indicating the atmospheric temperature, humidity, precipitation, wind speed, and the like around the location of the train, from the central device 5. [0032] In addition, when the determination unit 26 15 determines that the AS pressure is in a stable state, the control unit 12 acquires a brake cylinder pressure measurement value (hereinafter, referred to as “BC pressure measurement value”) indicating the measurement value of the BC pressure detected by the BC pressure sensor 17. The 20 control unit 12 acquires such a BC pressure measurement value as information for use in diagnosis of an anomaly or a sign of an anomaly relating to the BC pressure. For example, as illustrated in FIG. 3, the control unit 12 acquires the BC pressure measurement value in an interval 25 (BC pressure measurement value acquisition period) from the first time t1-1 until time t1-2. At the first time t1-1, the determination unit 26 determines that the AS pressure is in a stable state. At the time t1-2, the brake command is canceled. Assume that the brake command (brake notch 30 signal) remains not switched while the control unit 12 acquires the BC pressure measurement value which is information for use in diagnosis of an anomaly or a sign of an anomaly relating to the BC pressure. In addition, the 19 control unit 12 may acquire the BC pressure measurement value in an interval from when the determination unit 26 determines that the AS pressure is in a stable state to when the brake command is canceled and the speed of the 5 vehicle 2 becomes equal to or higher than a predetermined speed (for example, 5 km/h). Furthermore, the control unit 12 may acquire the BC pressure measurement value in an interval from when the determination unit 26 determines that the AS pressure is in a stable state to when a 10 predetermined brake cylinder pressure acquisition permission time has elapsed. Then, for example, the control unit 12 associates the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement value with information such as the train 15 position information, the environmental information, the temperature information, date and time information, the train speed information, brake command information, and the door open/close information when the determination unit 26 determines that the AS pressure is in a stable state. The 20 control unit 12 further associates the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement value with the vehicle identification information on the vehicle 2 having the brake device 18 installed therein, the device 25 identification information on the brake device 18, and the device identification information on the brake control device 3 and sends these associated information to the ground device 8 via the on-board wireless device 7. [0033] As illustrated in FIG. 1, the ground device 8 30 includes the data accumulation unit 30 and the diagnosis unit 31. The data accumulation unit 30 accumulates the AS pressure reference value, the BC pressure arithmetic value, the BC pressure measurement value, etc. sent from the 20 vehicle 2. Note that the data accumulation unit 30 similarly accumulates information acquired by the brake control device 3 installed in a vehicle 2 of a train other than the vehicle 2 of the train in such a manner as to 5 distinguish the information acquired by the brake control device 3 of the former vehicle 2 from the information acquired by the brake control device 3 of the latter vehicle 2. When the determination unit 26 determines that the AS pressure is in a stable state, the diagnosis unit 31 10 diagnoses an anomaly or a sign of an anomaly relating to the BC pressure, using the BC pressure measurement value detected by the BC pressure sensor 17. The diagnosis unit 31 acquires the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement 15 value, for example, from the data accumulation unit 30. The diagnosis unit 31 calculates a brake cylinder pressure measurement statistical value (hereinafter, referred to as “BC pressure measurement statistical value”) indicating a statistical value of the acquired BC pressure measurement 20 values. The diagnosis unit 31 calculates, for example, an average value or a median value of the BC pressure measurement values as the BC pressure measurement statistical value. Description will be hereinafter made as to an example in which the diagnosis unit 31 uses the 25 average value of the BC pressure measurement values as the BC pressure measurement statistical value. [0034] In addition, as illustrated in FIG. 3, the diagnosis unit 31 sets the acquired BC pressure arithmetic value as a brake cylinder pressure reference value 30 (hereinafter, referred to as “BC pressure reference value”). Note that the BC pressure reference value serves as a reference value when the diagnosis unit 31 diagnoses an anomaly or a sign of an anomaly relating to the BC pressure. 21 The diagnosis unit 31 determines that there is a sign of an anomaly when the BC pressure measurement statistical value is within a first upper limit-side anomaly sign region or within a first lower limit-side anomaly sign region. The 5 first upper limit-side anomaly sign region is a region where the BC pressure measurement statistical value is equal to or higher than a first upper limit value set to be higher than the BC pressure reference value. The first lower limit-side anomaly sign region is a region where the 10 BC pressure measurement statistical value is equal to or lower than a first lower limit value set to be lower than the BC pressure reference value. Then, when determining that there is a sign of an anomaly, for example, the diagnosis unit 31 generates and outputs an attention signal 15 for calling attention. For example, by sending the attention signal output from the diagnosis unit 31 to the vehicle 2 via the network 6, the ground device 8 displays information calling attention, on the monitor display of the cab 9 of the vehicle 2. 20 [0035] In addition, the diagnosis unit 31 determines that there is an anomaly relating to the BC pressure when the BC pressure measurement statistical value is within a first upper limit-side anomaly region or within a first lower limit-side anomaly region. The first upper limit25 side anomaly region is a region where the BC pressure measurement statistical value is equal to or higher than a second upper limit value set to be higher than the first upper limit value. The first lower limit-side anomaly region is a region where the BC pressure measurement 30 statistical value is equal to or lower than a second lower limit value set to be lower than the first lower limit value. Then, when determining that there is an anomaly, for example, the diagnosis unit 31 generates and outputs an 22 anomaly signal for notifying of the anomaly. For example, by sending the anomaly signal output from the diagnosis unit 31 to the vehicle 2 via the network 6, the ground device 8 displays information notifying of the anomaly, on 5 the monitor display of the cab 9 of the vehicle 2. [0036] FIG. 4 is a flowchart illustrating an example of the flow of a process of acquiring the BC pressure measurement value by the monitoring system according to the first embodiment of the present disclosure. Hereinafter, 10 an example of the procedure of the processing of acquiring the BC pressure measurement value by the monitoring system 1 according to the first embodiment of the present disclosure will be described with reference to the flowchart in FIG. 4. As illustrated in FIG. 4, in step 15 S101, the determination unit 26 of the monitoring system 1 determines whether or not the brake command has been input. [0037] When determining in step S101 that the brake command has been input (Yes), the determination unit 26 determines, in step S102, whether or not the vehicle 2 20 stops. When determining in step S101 that the brake command has not been input (No), the determination unit 26 again determines whether or not the brake command has been input. That is, the determination unit 26 repeats the determination in S101 until the brake command is input. 25 [0038] When determining in step S102 that the vehicle 2 stops (Yes), the determination unit 26 determines, in step S103, whether or not the door close information has been received, the door close information indicating that the doors of the vehicle 2 for passengers to get on and off 30 have been closed as passengers have finished getting on and off the stopped vehicle 2. When determining in step S102 that the vehicle 2 does not stop (No), the determination unit 26 returns to step S101 and again determines whether 23 or not the brake command has been input. [0039] When determining in step S103 that the door close information has been received (Yes), in step S104, the determination unit 26 determines whether or not the 5 predetermined first time t1-1 has elapsed from the time point at which the door close information was received. When determining in step S103 that the door close information has not been received (No), the determination unit 26 again determines whether or not the door close 10 information has been received. That is, the determination unit 26 repeats the determination in S103 until the door close information is received. [0040] When the determination unit 26 determines, in step S104, that the first time t1-1 has elapsed (Yes), the 15 BC pressure arithmetic unit 27 of the monitoring system 1 sets, in S105, the AS pressure as the AS pressure reference value. In other words, the BC pressure arithmetic unit 27 sets, as the AS pressure reference value, the AS pressure detected by the AS pressure sensor 15 when the 20 determination unit 26 determines that the AS pressure is in a stable state. In addition, when determining in step S104 that the first time t1-1 has not elapsed (No), the determination unit 26 again determines whether or not the first time t1-1 has elapsed. That is, the determination 25 unit 26 repeats the determination in S104 until the first time t1-1 has elapsed. [0041] Then, using the AS pressure reference value set in step S105, the BC pressure arithmetic unit 27 calculates, in step S106, the BC pressure arithmetic value indicating 30 the target pressure of the brake cylinder 24. In addition, the control unit 12 acquires, in S107, the BC pressure measurement value as information for use in diagnosis of an anomaly or a sign of an anomaly relating to the BC pressure. 24 [0042] Next, in step S108, the determination unit 26 determines whether or not the brake command has been canceled. When the determination unit 26 determines, in step S108, that the brake command has been canceled (Yes), 5 the control unit 12 terminates the acquisition of the BC pressure measurement value as information for use in diagnosis of an anomaly or a sign of an anomaly relating to the BC pressure. [0043] In addition, when the determination unit 26 10 determines, in step S108, that the brake command has not been canceled (No), the control unit 12 returns to step S107 and again acquires the BC pressure measurement value. That is, the control unit 12 acquires the BC pressure measurement value in an interval from when the 15 determination unit 26 determines that the AS pressure is in a stable state to when the brake command is canceled. Then, the control unit 12 outputs, in step S109, the BC pressure measurement value, the AS pressure reference value, and the BC pressure arithmetic value. At this time, the control 20 unit 12 outputs the BC pressure measurement value, the AS pressure reference value, and the BC pressure arithmetic value in association with the vehicle identification information on the vehicle 2 having the brake device 18 installed therein, the device identification information on 25 the brake device 18, the device identification information on the brake control device 3, and the like. In addition, the control unit 12 may associate, with the BC pressure measurement value, the AS pressure reference value, and the BC pressure arithmetic value, information such as the train 30 position information, the environmental information, the temperature information, the date and time information, the train speed information, the brake command information, and the door open/close information when the determination unit 25 26 determines that the AS pressure is in a stable state. Furthermore, the state information such as the BC pressure measurement value, the AS pressure reference value, and the BC pressure arithmetic value output from the control unit 5 12 is sent to the ground device 8 via the terminal device 4, the central device 5, and the on-board wireless device 7, for example. [0044] FIG. 5 is a flowchart illustrating an example of the procedure of diagnosis of a sign of an anomaly and an 10 anomaly by the monitoring system according to the first embodiment of the present disclosure. An example of the procedure of diagnosis of a sign of an anomaly and an anomaly according to the first embodiment of the present disclosure will be hereinafter described with reference to 15 the flowchart in FIG. 5. As illustrated in FIG. 5, in step S201, the diagnosis unit 31 of the monitoring system 1 determines whether or not the BC pressure measurement value and the BC pressure arithmetic value when the determination unit 26 determines that the AS pressure is in a stable 20 state have been acquired. [0045] When determining in step S201 that the BC pressure measurement value and the BC pressure arithmetic value have been acquired (Yes), the diagnosis unit 31 calculates, in step S202, an average value of the BC 25 pressure measurement values as the BC pressure measurement statistical value indicating a statistical value of the acquired BC pressure measurement values. When determining in step S201 that the BC pressure measurement value and the BC pressure arithmetic value have not been acquired (No), 30 the diagnosis unit 31 again determines whether or not the BC pressure measurement value and the BC pressure arithmetic value have been acquired. That is, the diagnosis unit 31 repeats the determination in S201 until 26 the BC pressure measurement value and the BC pressure arithmetic value are acquired. [0046] In addition, in step S203, the diagnosis unit 31 sets the BC pressure arithmetic value acquired in step S201 5 as the BC pressure reference value. Then, in step S204, as illustrated in FIG. 3, the diagnosis unit 31 determines whether or not the BC pressure measurement statistical value is equal to or higher than the first upper limit value set to be higher than the BC pressure reference value 10 or is equal to or lower than the first lower limit value set to be lower than the BC pressure reference value. [0047] When determining in step S204 that the BC pressure measurement statistical value is equal to or higher than the first upper limit value or is equal to or 15 lower than the first lower limit value (Yes), the diagnosis unit 31 determines, in step S205, whether or not the BC pressure measurement statistical value is equal to or higher than the second upper limit value set to be higher than the first upper limit value or equal to or lower than 20 the second lower limit value set to be lower than the first lower limit value. [0048] When determining in step S205 that the BC pressure measurement statistical value is equal to or higher than the second upper limit value or is equal to or 25 lower than the second lower limit value (Yes), the diagnosis unit 31 determines, in step S206, that the BC pressure measurement statistical value is within the first upper limit-side anomaly region or the first lower limitside anomaly region. In other words, the diagnosis unit 31 30 determines that an anomaly relating to the BC pressure has arisen, and generates and outputs the anomaly signal for notifying of the anomaly. [0049] When determining in step S205 that the BC 27 pressure measurement statistical value is not equal to or higher than the second upper limit value or is not equal to or lower than the second lower limit value (No), the diagnosis unit 31 determines, in step S207, that the BC 5 pressure measurement statistical value is within the first upper limit-side anomaly sign region or the first lower limit-side anomaly sign region. In other words, the diagnosis unit 31 determines that there is a sign of an anomaly relating to the BC pressure, and generates and 10 outputs the attention signal for calling attention. [0050] In addition, when determining in step S204 that the BC pressure measurement statistical value is not equal to or higher than the first upper limit value or is not equal to or lower than the first lower limit value (No), 15 the diagnosis unit 31 determines, in step S208, that the BC pressure measurement statistical value is within a normal region, and generates and outputs a normal signal. Note that, in step S202, the diagnosis unit 31 may calculate another statistical value as the BC pressure measurement 20 statistical value instead of the average value of the BC pressure measurement values and may calculate a median value, for example. In addition, the diagnosis unit 31 may perform the processes in steps S204 and S205 using the BC pressure measurement value acquired in S201 as a substitute 25 for the BC pressure measurement statistical value without calculating the BC pressure measurement statistical value in step S202. [0051] The monitoring system 1 according to the first embodiment of the present disclosure includes: the AS 30 pressure sensor 15 to detect the AS pressure indicating the pressure of the air spring 20 provided in the vehicle 2; the BC pressure sensor 17 to detect the BC pressure indicating the pressure of the brake cylinder 24 of the 28 brake device 18 to generate a mechanical braking force by pressing the brake shoe 25 against the wheel 19; the determination unit 26 to determine whether or not the door close information has been received, the door close 5 information indicating that a door of the vehicle 2 for the passengers to get on and off has been closed as passengers have finished getting on and off the vehicle 2 when the vehicle 2 stops with a brake command input; and the diagnosis unit 31 to acquire the BC pressure measurement 10 value indicating the value of the BC pressure detected by the BC pressure sensor 17, as information for use in diagnosis of an anomaly or a sign of an anomaly when the determination unit 26 determines that the door close information has been received. It is therefore possible to 15 acquire a stable BC pressure measurement value for use in diagnosis of an anomaly or a sign of an anomaly. [0052] In the monitoring system 1 according to the first embodiment of the present disclosure, the determination unit 26 determines whether or not the AS pressure is in a 20 stable state, on the basis of the door close information indicating that the door of the vehicle 2 for the passengers to get on and off has been closed as the passengers have finished getting on and off the stopped vehicle 2. It is therefore possible to efficiently acquire 25 the BC pressure measurement value as fluctuations in the AS pressure due to the passengers getting on and off the vehicle 2 have settled down. [0053] In the monitoring system 1 according to the first embodiment of the present disclosure, when determining that 30 the door close information has been received, the determination unit 26 determines that the AS pressure is in a stable state after the predetermined first time has elapsed since the door close information was received. It 29 is therefore possible to efficiently acquire a more stable BC pressure measurement value. [0054] In the monitoring system 1 according to the first embodiment of the present disclosure, the determination 5 unit 26 determines that the AS pressure is in a stable state when the AS pressure detected by the AS pressure detection unit continuously remains within the predetermined range of fluctuation width for a certain period of time. It is therefore possible to determine 10 whether or not the AS pressure is in a stable state, without acquiring door close information. [0055] In the monitoring system 1 according to the first embodiment of the present disclosure, the diagnosis unit 31 acquires the BC pressure measurement value in an interval 15 from when the determination unit 26 determines that the AS pressure is in a stable state to when the brake command is canceled, or in an interval from when the determination unit 26 determines that the AS pressure is in a stable state to when the brake command is canceled and the speed 20 of the vehicle 2 becomes equal to or higher than a predetermined speed. It is therefore possible to efficiently acquire a stable BC pressure measurement value, using a period of time during which the vehicle 2 stops at a station, for example. 25 [0056] In the monitoring system 1 according to the first embodiment of the present disclosure, the diagnosis unit 31 acquires the BC pressure measurement value in an interval from when the determination unit 26 determines that the AS pressure is in a stable state to when a predetermined brake 30 cylinder pressure acquisition permission time has elapsed. It is therefore possible to prevent the acquisition of the BC pressure measurement value more than necessary. [0057] The monitoring system 1 according to the first 30 embodiment of the present disclosure includes the BC pressure arithmetic unit 27 to set, as the AS pressure reference value, the AS pressure detected by the AS pressure sensor 15 when the determination unit 26 5 determines that the AS pressure is in a stable state. The BC pressure arithmetic unit 27 calculates the BC pressure arithmetic value, using the AS pressure reference value, the BC pressure arithmetic value indicating an arithmetic value of the pressure of the brake cylinder 24. The 10 diagnosis unit 31 sets, as the BC pressure reference value, the BC pressure arithmetic value calculated by the BC pressure arithmetic unit 27, and determines that there is a sign of an anomaly when the BC pressure measurement value is within the first upper limit-side anomaly sign region or 15 within the first lower limit-side anomaly sign region, the first upper limit-side anomaly sign region being a region where the BC pressure measurement value is equal to or higher than the first upper limit value set to be higher than the BC pressure reference value, the first lower 20 limit-side anomaly sign region being a region where the BC pressure measurement value is equal to or lower than the first lower limit value set to be lower than the BC pressure reference value. It is therefore possible to determine a phase preceding the occurrence of an anomaly, 25 which phase was conventionally considered normal. [0058] In the monitoring system 1 according to the first embodiment of the present disclosure, the diagnosis unit 31 calculates the BC pressure measurement statistical value indicating a statistical value of the BC pressure 30 measurement values when the determination unit 26 determines that the AS pressure is in a stable state, and determines that there is a sign of an anomaly when the BC pressure measurement statistical value is within the first 31 upper limit-side anomaly sign region or the first lower limit-side anomaly sign region. It is therefore possible to reduce the number of times of processing in determining a sign of an anomaly, even when the data amount of the BC 5 pressure measurement values is large. [0059] In the monitoring system 1 according to the first embodiment of the present disclosure, the BC pressure measurement statistical value is an average value or a median value of the BC pressure measurement values. It is 10 therefore possible to accurately diagnose an anomaly or a sign of an anomaly relating to the BC pressure. [0060] In the monitoring system 1 according to the first embodiment of the present disclosure, the diagnosis unit 31 determines that there is an anomaly when the BC pressure 15 measurement value or the BC pressure measurement statistical value is within the first upper limit-side anomaly region or within the first lower limit-side anomaly region, the first upper limit-side anomaly region being a region where the BC pressure measurement value or the BC 20 pressure measurement statistical value is equal to or higher than the second upper limit value set to be higher than the first upper limit value, the first lower limitside anomaly region being a region where the BC pressure measurement value or the BC pressure measurement 25 statistical value is equal to or lower than the second lower limit value set to be lower than the first lower limit value. It is therefore possible to appropriately determine an anomaly relating to the BC pressure that needs to be immediately handled. 30 [0061] In the monitoring system 1 according to the first embodiment of the present disclosure, the diagnosis unit 31 outputs the attention signal for calling attention when determining that there is a sign of an anomaly, and outputs 32 the anomaly signal for notifying of an anomaly when determining that there is an anomaly. It is therefore possible to appropriately inform a driver, etc. of the anomaly or the sign of the anomaly. 5 [0062] The monitoring system 1 according to the first embodiment of the present disclosure includes the data accumulation unit 30 to accumulate the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement value when the determination unit 10 26 determines that the AS pressure is in a stable state. It is therefore possible to diagnose an anomaly or a sign of an anomaly by acquiring the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement value from the data accumulation unit 30. 15 [0063] The monitoring system 1 according to the first embodiment of the present disclosure includes the position information acquisition unit 28 to acquire the position information on the vehicle 2. The data accumulation unit 30 accumulates the position information on the vehicle 2 in 20 association with the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement value, the position information on the vehicle 2 being acquired by the position information acquisition unit 28 when the determination unit 26 determines that the AS 25 pressure is in a stable state. It is therefore possible to learn of where the vehicle 2 was located when the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement value accumulated in the data accumulation unit 30 were given. 30 [0064] The monitoring system 1 according to the first embodiment of the present disclosure includes the temperature detection unit 23 to detect the temperature information around the brake device 18. The data 33 accumulation unit 30 accumulates the temperature information in association with the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement value, the temperature information 5 being detected by the temperature detection unit 23 when the determination unit 26 determines that the AS pressure is in a stable state. It is therefore possible to learn of how many degrees the temperature around the brake device 18 was when the AS pressure reference value, the BC pressure 10 arithmetic value, and the BC pressure measurement value accumulated in the data accumulation unit 30 were given. [0065] The monitoring system 1 according to the first embodiment of the present disclosure includes the environmental information acquisition unit 29 to acquire 15 the environmental information including at least one of the atmospheric temperature, humidity, precipitation, and wind speed of an area where the vehicle 2 is located. The data accumulation unit 30 accumulates the environmental information in association with the AS pressure reference 20 value, the BC pressure arithmetic value, and the BC pressure measurement value, the environmental information being acquired by the environmental information acquisition unit 29 when the determination unit 26 determines that the AS pressure is in a stable state. It is therefore possible 25 to learn of what state of environment the area where the vehicle 2 is located has when the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement value accumulated in the data accumulation unit 30 were given. 30 [0066] In the monitoring system 1 according to the first embodiment of the present disclosure, the BC pressure detection unit detects, as the BC pressure, a usual or service brake cylinder pressure or an emergency brake 34 cylinder pressure, the service brake cylinder pressure being the pressure applied to the brake cylinder 24 on the basis of a service brake command, the emergency brake cylinder pressure being the pressure applied to the brake 5 cylinder 24 on the basis of an emergency brake command. It is therefore possible to diagnose an anomaly or a sign of an anomaly relating to the BC pressure at the time of not only the service brake command but also the emergency brake command. 10 [0067] Note that, the monitoring system 1 according to this first embodiment includes, by way of example, the BC pressure arithmetic unit 27 provided in the control unit 12 of the brake control device 3, as illustrated in FIG. 2, but the BC pressure arithmetic unit 27 may be provided in 15 the ground device 8. In this case, for example, the control unit 12 of the brake control device 3 only needs to send the AS pressure reference value, which is the AS pressure detected by the AS pressure sensor 15 when the determination unit 26 determines that the AS pressure is in 20 a stable state, to the ground device 8 via the on-board wireless device 7 such that the BC pressure arithmetic unit 27 provided in the ground device 8 calculates the BC pressure arithmetic value. [0068] Second Embodiment. 25 Next, the monitoring system 1 according to a second embodiment of the present disclosure will be described. The monitoring system 1 according to the second embodiment is different from the monitoring system according to the first embodiment in the method of determining an anomaly or 30 a sign of an anomaly by the diagnosis unit 31. Note that, since the configuration of the monitoring system 1 according to the second embodiment is similar to the configuration of the monitoring system 1 according to the 35 first embodiment illustrated in FIG. 1, the detailed description thereof will be omitted. For the monitoring system 1 according to this first embodiment, as illustrated in FIG. 3, by way of example, the diagnosis unit 31 5 diagnoses an anomaly or a sign of an anomaly, using the BC pressure measurement value in one BC pressure measurement value acquisition period from the first time t1-1 at which the determination unit 26 determines that the AS pressure is in a stable state, until the time t1-2 at which the 10 brake command is canceled. However, the diagnosis unit 31 of the monitoring system 1 according to the second embodiment diagnoses an anomaly or a sign of an anomaly, using the BC pressure measurement values acquired in a plurality of BC pressure measurement value acquisition 15 periods within a predetermined first period. In addition, for example, the diagnosis unit 31 of the monitoring system 1 according to the second embodiment may acquire the AS pressure reference value, the BC pressure reference value, and the BC pressure measurement value every time the 20 determination unit 26 determines that the AS pressure is in a stable state in the first period, and obtain a tendency of the BC pressure measurement values or the BC pressure measurement statistical values in the first period, using the AS pressure reference values, the BC pressure reference 25 values, and the BC pressure measurement values or the BC pressure measurement statistical values. Note that, for example, the first period is a period on a one-day basis or a one-week basis or the like, but is not particularly limited. 30 [0069] FIG. 6 is a diagram illustrating an example of the BC pressure measurement statistical values within the first period. In FIG. 6, the horizontal axis indicates the AS pressure, and the vertical axis indicates the BC 36 pressure. Each of a plurality of plots of “×” marks in FIG. 6 indicates the BC pressure measurement statistical value indicating a statistical value (average value) of the BC pressure measurement values in one BC pressure measurement 5 value acquisition period. In addition, in FIG. 6, the solid line illustrates the BC pressure reference value, and the broken lines illustrate the first upper limit value, the first lower limit value, the second upper limit value, and the second lower limit value. As illustrated in FIG. 6, 10 the BC pressure reference value increases in proportion to the increase in the AS pressure. FIG. 6 indicates an example in which one BC pressure measurement statistical value A1 is within the first lower limit side anomaly region and one BC pressure measurement statistical value A2 15 is within the first lower limit side anomaly sign region. In addition, in FIG. 6, a large number of BC pressure measurement statistical values are distributed on the lower limit side lower than the BC pressure reference value. In such a case, the diagnosis unit 31 can determine that, for 20 example, the BC pressure measurement statistical values tend to be on the side of the lower limit. [0070] In addition, the diagnosis unit 31 of the monitoring system 1 according to the second embodiment may determine that there is a sign of an anomaly relating to 25 the BC pressure, for example, when a predetermined number or more of or a predetermined proportion or more of the BC pressure measurement values or the BC pressure measurement statistical values in the first period are included in the first upper limit-side anomaly sign region or the first 30 lower limit-side anomaly sign region. FIG. 7 is a flowchart illustrating an example of the procedure of diagnosis of a sign of an anomaly and an anomaly by the monitoring system according to the second embodiment of the 37 present disclosure. An example of the procedure of diagnosis of a sign of an anomaly and an anomaly according to the second embodiment of the present disclosure will be hereinafter described with reference to the flowchart in 5 FIG. 7. As illustrated in FIG. 7, in step S301, the diagnosis unit 31 of the monitoring system 1 according to the second embodiment determines whether or not the BC pressure measurement value and the BC pressure arithmetic value when the determination unit 26 determines that the AS 10 pressure is in a stable state have been acquired. [0071] When determining in step S301 that the BC pressure measurement value and the BC pressure arithmetic value have been acquired (Yes), the diagnosis unit 31 calculates, in step S302, an average value of the BC 15 pressure measurement values as the BC pressure measurement statistical value indicating a statistical value of the acquired BC pressure measurement values. When determining, in step S301, that the BC pressure measurement value and the BC pressure arithmetic value have not been acquired 20 (No), the diagnosis unit 31 again determines whether or not the BC pressure measurement value and the BC pressure arithmetic value have been acquired. That is, the diagnosis unit 31 repeats the determination in S301 until the BC pressure measurement value and the BC pressure 25 arithmetic value are acquired. [0072] In addition, in step S303, the diagnosis unit 31 sets the BC pressure arithmetic value acquired in step S301 as the BC pressure reference value. Then, in step S304, the diagnosis unit 31 determines whether or not the BC 30 pressure measurement statistical value is equal to or higher than the first upper limit value set to be higher than the BC pressure reference value or is equal to or lower than the first lower limit value set to be lower than 38 the BC pressure reference value. [0073] When determining in step S304 that the BC pressure measurement statistical value is equal to or higher than the first upper limit value or is equal to or 5 lower than the first lower limit value (Yes), the diagnosis unit 31 determines, in step S305, whether or not the BC pressure measurement statistical value is equal to or higher than the second upper limit value set to be higher than the first upper limit value or is equal to or lower 10 than the second lower limit value set to be lower than the first lower limit value. [0074] When determining in step S305 that the BC pressure measurement statistical value is equal to or higher than the second upper limit value or is equal to or 15 lower than the second lower limit value (Yes), the diagnosis unit 31 determines, in step S306, that the BC pressure measurement statistical value is within the first upper limit-side anomaly region or the first lower limitside anomaly region. In other words, the diagnosis unit 31 20 determines that an anomaly relating to the BC pressure has arisen, and generates and outputs the anomaly signal for notifying of the anomaly. [0075] When determining in step S305 that the BC pressure measurement statistical value is not equal to or 25 higher than the second upper limit value or is not equal to or lower than the second lower limit value (No), the diagnosis unit 31 determines, in step S307, whether or not the BC pressure measurement statistical value equal to or higher than the first upper limit value appears a 30 predetermined number of times N or more or the BC pressure measurement statistical value equal to or lower than the first lower limit value appears the predetermined number of times N or more. 39 [0076] When determining in step S307 that the BC pressure measurement statistical value equal to or higher than the first upper limit value appears the predetermined number of times N or more or that the BC pressure 5 measurement statistical value equal to or lower than the first lower limit value appears the predetermined number of times N or more (Yes), the diagnosis unit 31 determines, in step S308, that there is a sign of an anomaly relating to the BC pressure, and generates and outputs the attention 10 signal for calling attention. [0077] When determining in step S307 that the BC pressure measurement statistical value equal to or higher than the first upper limit value does not appear the predetermined number of times N or more or the BC pressure 15 measurement statistical value equal to or lower than the first lower limit value does not appear the predetermined number of times N or more (No), the diagnosis unit 31 determines, in step S309, whether or not the first period has elapsed. 20 [0078] When determining in step S309 that the first period has elapsed (Yes), the diagnosis unit 31 determines, in step S310, the BC pressure measurement statistical values to be normal, and generates and outputs the normal signal. When determining in step S309 that the first 25 period has not elapsed (No), the diagnosis unit 31 returns to step S301 and determines whether or not the BC pressure measurement value and the BC pressure arithmetic value have been acquired. [0079] In addition, when determining in step S304 that 30 the BC pressure measurement statistical value is not equal to or higher than the first upper limit value or is equal to or lower than the first lower limit value (No), the diagnosis unit 31 determines, in step S309, whether or not 40 the first period has elapsed. Then, when determining in step S309 that the first period has elapsed (Yes), in step S310, the diagnosis unit 31 determines the BC pressure measurement statistical values to be normal, and generates 5 and outputs the normal signal. In addition, when determining in step S309 that the first period has not elapsed (No), the diagnosis unit 31 returns to step S301 and determines whether or not the BC pressure measurement value and the BC pressure arithmetic value have been 10 acquired. [0080] Third Embodiment. Next, the monitoring system 1 according to a third embodiment of the present disclosure will be described. The monitoring system 1 according to the third embodiment 15 is different from the monitoring system according to the first and second embodiments in the method of determining an anomaly or a sign of an anomaly by the diagnosis unit 31. Note that, since the configuration of the monitoring system 1 according to the third embodiment is similar to the 20 configuration of the monitoring system 1 according to the first embodiment illustrated in FIG. 1, the detailed description thereof will be omitted. For example, every time the determination unit 26 determines that the AS pressure is in a stable state, the diagnosis unit 31 of the 25 monitoring system 1 according to the third embodiment may calculate a brake cylinder pressure difference (hereinafter, referred to as “BC pressure difference”) indicating the difference between the BC pressure measurement value or the BC pressure measurement statistical value and the BC 30 pressure reference value and obtain a temporal tendency of the BC pressure differences. In addition, the diagnosis unit 31 of the monitoring system 1 according to the third embodiment calculates a brake cylinder pressure difference 41 statistical value (hereinafter, referred to as “BC pressure difference statistical value”) indicating a statistical value of the BC pressure differences for each predetermined second period, for example, and obtains a temporal tendency 5 of the BC pressure difference statistical values. Note that, for example, the second period is a period on a oneday basis or a week basis, etc., but is not limited to a particular period. In addition, the diagnosis unit 31 may calculate the BC pressure difference statistical value not 10 for each period but every time the BC pressure differences are calculated a predetermined number of times. Furthermore, for example, the BC pressure difference statistical value includes an average value, a median value, a maximum value, a minimum value, etc. of the BC pressure 15 differences within the second period. [0081] FIG. 8 is a diagram illustrating an example of temporally represented brake cylinder pressure difference statistical values. In FIG. 8, the horizontal axis indicates the date, and the vertical axis indicates the BC 20 pressure difference. FIG. 8 illustrates the BC pressure difference statistical values for 10 days as an example. Note that FIG. 8 illustrates an example in which the second period is one-day basis. In FIG. 8, the dates on the horizontal axis are expressed as day 1 to day 10 but may be 25 expressed as day, month, and year. In addition, in FIG. 8, the “●” marks each indicate the maximum value of the BC pressure differences within the second period, the “◊” marks each indicate the average value of the BC pressure differences within the second period, and the “■” marks 30 each indicate the minimum value of the BC pressure differences within the second period. FIG. 8 illustrates an example in which the maximum value and the average value of the BC pressure differences all fall within the normal 42 region, and only the minimum value of the BC pressure differences on day 3 is located within a second lower limit-side anomaly sign region. For example, as illustrated in FIG. 8, the diagnosis unit 31 of the 5 monitoring system 1 according to the third embodiment may calculate the BC pressure difference statistical value for each second period and obtain a temporal tendency by performing tendency estimation, etc. In addition, to diagnose an anomaly or a sign of an anomaly, the diagnosis 10 unit 31 may perform machine learning, combining information such as the environmental information and the temperature information accumulated in the data accumulation unit 30 together with the plurality of BC pressure difference statistical values. 15 [0082] Furthermore, the diagnosis unit 31 of the monitoring system 1 according to the third embodiment may diagnose an anomaly or a sign of an anomaly relating to the BC pressure, using, for example, the BC pressure difference statistical value. Specifically, for example, as 20 illustrated in FIG. 8, when the average value of the BC pressure differences within the second period is within a second upper limit-side anomaly sign region or within a second lower limit-side anomaly sign region, the diagnosis unit 31 determines that there is a sign of an anomaly. The 25 second upper limit-side anomaly sign region is a region where the average value is equal to or higher than a third upper limit value set to be higher than a brake cylinder pressure difference reference value (hereinafter, “BC pressure difference reference value”) indicating a state in 30 which the difference between the BC pressure measurement value or the BC pressure measurement statistical value and the BC pressure reference value is zero. The second lower limit-side anomaly sign region is a region where the 43 average value is equal to or lower than a third lower limit value set to be lower than the BC pressure difference reference value. In addition, the diagnosis unit 31 determines that there is an anomaly when the average value 5 of the BC pressure differences is within a second upper limit-side anomaly region or within a second lower limitside anomaly region. The second upper limit-side anomaly region is a region where the average value is equal to or higher than a fourth upper limit value set to be higher 10 than the third upper limit value. The second lower limitside anomaly region is a region where the average value is equal to or lower than a fourth lower limit value set to be lower than the third lower limit value. Note that the difference between the third upper limit value and the BC 15 pressure difference reference value may be the same as the difference between the first upper limit value and the BC pressure reference value illustrated in FIG. 6. Alternatively, the third upper limit value may be set so that a difference between the third upper limit value and 20 the BC pressure difference reference value differs from the difference between the first upper limit value and the BC pressure reference value illustrated in FIG. 6. In addition, similarly, the difference between the third lower limit value and the BC pressure difference reference value 25 may have the same value as the value of the difference between the first lower limit value and the BC pressure reference value illustrated in FIG. 6. Alternatively, the third lower limit value may be set so that a difference between the third lower limit value and the BC pressure 30 difference reference value differs from the difference between the first lower limit value and the BC pressure reference value illustrated in FIG. 6. Furthermore, the difference between the fourth upper limit value and the 44 third upper limit value, that is, the width of the BC pressure in the second upper limit-side anomaly sign region, may be the same as the difference between the second upper limit value and the first upper limit value illustrated in 5 FIG. 6, that is, the width of the BC pressure in the first upper limit-side anomaly sign region. Alternatively, the third upper limit value or the fourth upper limit value may be set so that a difference between the fourth upper limit value and the third upper limit value differs from the 10 difference between the second upper limit value and the first upper limit value illustrated in FIG. 6. Likewise, the difference between the fourth lower limit value and the third lower limit value, that is, the width of the BC pressure in the second lower limit-side anomaly sign region, 15 may be the same as the difference between the second lower limit value and the first lower limit value illustrated in FIG. 6, that is, the width of the BC pressure in the first lower limit-side anomaly sign region. Alternatively, the third lower limit value or the fourth lower limit value may 20 be set so that a difference between the fourth lower limit value and the third lower limit value differs from the difference between the second lower limit value and the first lower limit value illustrated in FIG. 6. In addition, the diagnosis unit 31 may use, as the BC pressure 25 difference statistical value, a median value of the BC pressure differences within the second period, instead of the average value. [0083] Furthermore, the diagnosis unit 31 may calculate the maximum value and the minimum value of the BC pressure 30 differences within the second period as the BC pressure difference statistical values and determine that there is a sign of an anomaly when the maximum value is within the second upper limit-side anomaly sign region or when the 45 minimum value is within the second lower limit-side anomaly sign region. Likewise, the diagnosis unit 31 may determine that there is an anomaly when the maximum value is within the second upper limit-side anomaly region, or when the 5 minimum value is within the second lower limit-side anomaly region, the second upper limit-side anomaly region being a region where the maximum value is equal to or higher than the fourth upper limit value, the second lower limit-side anomaly region being a region where the minimum value is 10 equal to or lower than the fourth lower limit value. [0084] FIG. 9 is a flowchart illustrating an example of the procedure of diagnosis of a sign of an anomaly and an anomaly by the monitoring system according to the third embodiment of the present disclosure. An example of the 15 procedure of diagnosis of a sign of an anomaly and an anomaly according to the third embodiment of the present disclosure will be hereinafter described with reference to the flowchart in FIG. 9. As illustrated in FIG. 9, in step S401, the diagnosis unit 31 of the monitoring system 1 20 according to the third embodiment determines whether or not the BC pressure measurement value and the BC pressure arithmetic value when the determination unit 26 determines that the AS pressure is in a stable state have been acquired. 25 [0085] When determining in step S401 that the BC pressure measurement value and the BC pressure arithmetic value have been acquired (Yes), the diagnosis unit 31 calculates, in step S402, an average value of the BC pressure measurement values as the BC pressure measurement 30 statistical value indicating a statistical value of the acquired BC pressure measurement values. The diagnosis unit 31 then calculates the BC pressure difference indicating the difference between the BC pressure 46 measurement statistical value and the BC pressure reference value. When determining in step S401 that the BC pressure measurement value and the BC pressure arithmetic value have not been acquired (No), the diagnosis unit 31 again 5 determines whether or not the BC pressure measurement value and the BC pressure arithmetic value have been acquired. That is, the diagnosis unit 31 repeats the determination in S401 until the BC pressure measurement value and the BC pressure arithmetic value are acquired. 10 [0086] In step S403, the diagnosis unit 31 determines whether or not the second period has elapsed. When determining, in step S403, that the second period has elapsed (Yes), the diagnosis unit 31 calculates, in step S404, the BC pressure difference statistical value 15 indicating a statistical value (for example, an average value) of the BC pressure differences within the second period. In addition, when determining, in step S403, that the second period has not elapsed (No), the diagnosis unit 31 returns to step S401 and determines whether or not the 20 BC pressure measurement value and the BC pressure arithmetic value have been acquired. [0087] In step S405, the diagnosis unit 31 determines whether or not the BC pressure difference statistical value calculated in step S404 is equal to or higher than the 25 third upper limit value or is equal to or lower than the third lower limit value. When determining in step S405 that the BC pressure difference statistical value is equal to or higher than the third upper limit value or is equal to or lower than the third lower limit value (Yes), the 30 diagnosis unit 31 determines, in step S406, whether or not the BC pressure difference statistical value is equal to or higher than the fourth upper limit value set to be higher than the third upper limit value or is equal to or lower 47 than the fourth lower limit value set to be lower than the third lower limit value. [0088] When determining in step S406 that the BC pressure difference statistical value is equal to or higher 5 than the fourth upper limit value or equal to or lower than the fourth lower limit value (Yes), the diagnosis unit 31 determines, in step S407, that the BC pressure difference statistical value is within the second upper limit-side anomaly region or the second lower limit-side anomaly 10 region. In other words, the diagnosis unit 31 determines that an anomaly relating to the BC pressure has arisen, and generates and outputs the anomaly signal for notifying of the anomaly. [0089] When determining in step S406 that the BC 15 pressure difference statistical value is not equal to or higher than the fourth upper limit value or is not equal to or lower than the fourth lower limit value (No), the diagnosis unit 31 determines, in step S408, that the BC pressure difference statistical value is within the second 20 upper limit-side anomaly sign region or the second lower limit-side anomaly sign region. In other words, the diagnosis unit 31 determines that there is a sign of an anomaly relating to the BC pressure, and generates and outputs the attention signal for calling attention. 25 [0090] In addition, when determining in step S405 that the BC pressure difference statistical value is not equal to or higher than the third upper limit value or is not equal to or lower than the third lower limit value (No), the diagnosis unit 31 determines, in step S409, that the BC 30 pressure difference statistical value is within the normal region, and generates and outputs the normal signal. [0091] In the monitoring system 1 according to the present first to third embodiments, when the determination 48 unit 26 determines that the AS pressure is in a stable state, the BC pressure measurement value detected by the BC pressure sensor 17 is acquired as information for use in diagnosis of an anomaly or a sign of an anomaly relating to 5 the BC pressure. However, in the monitoring system 1 of the present disclosure, the determination unit 26 may determine whether or not the BC pressure detected by the BC pressure sensor 17 is in a stable state when the vehicle 2 stops with the brake command input. 10 [0092] FIG. 10 is a diagram illustrating another example of timing of acquiring the BC pressure measurement value in the monitoring system according to the first embodiment of the present disclosure. For example, as illustrated in FIG. 10, the determination unit 26 may determine that the BC 15 pressure is in a stable state after a predetermined second time t2-1 has elapsed since the brake command was input from the brake released state when the stopped vehicle 2 is checked in leaving a depot. In FIG. 10, when the determination unit 26 determines that the BC pressure is in 20 a stable state, the monitoring system 1 acquires the BC pressure measurement value detected by the BC pressure sensor 17 as information for use in diagnosis of an anomaly or a sign of an anomaly relating to the BC pressure. Then, the monitoring system 1 acquires the BC pressure 25 measurement value in the BC pressure measurement value acquisition period (the difference between a third time t2- 2 and the second time t2-1) from when the determination unit 26 determines that the BC pressure is in a stable state to when the predetermined brake cylinder pressure 30 acquisition permission time has elapsed. [0093] In addition, in the monitoring system 1 according to this first embodiment, the diagnosis unit 31 does not need to acquire the AS pressure reference value, the BC 49 pressure arithmetic value, and the BC pressure measurement value every time when the determination unit 26 determines that the AS pressure is in a stable state or determines that the BC pressure is in a stable state in the second 5 period. For example, the diagnosis unit 31 may acquire the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement value when the AS pressure reference value, the BC pressure arithmetic value, and the BC pressure measurement value match a predetermined 10 condition in the second period. Examples of the predetermined condition are where the AS pressure reference value is within a predetermined AS pressure region, and where the determination unit 26 determines the BC pressure is in a stable state when the vehicle is checked in leaving 15 a depot. This allows the diagnosis unit 31 to efficiently acquire the BC pressure measurement value under the predetermined condition. [0094] In addition, the monitoring system 1 according to this first embodiment includes, by way of example, the data 20 accumulation unit 30 and the diagnosis unit 31 provided in the ground device 8, as illustrated in FIG. 1. However, the data accumulation unit 30 and the diagnosis unit 31 are not limited to being provided in the ground device 8. For example, the monitoring system 1 may be configured such 25 that the data accumulation unit 30 and the diagnosis unit 31 are provided in the brake control device 3, the central device 5, etc. provided in the vehicle 2. [0095] Fourth Embodiment. Next, the monitoring system 1 according to a fourth 30 embodiment of the present disclosure will be described. The monitoring system 1 according to the fourth embodiment is different from the monitoring system according to the first to third embodiments in the method of determining an 50 anomaly or a sign of an anomaly by the diagnosis unit 31. Note that, since the configuration of the monitoring system 1 according to the fourth embodiment is similar to the configuration of the monitoring system 1 according to the 5 first embodiment illustrated in FIG. 1, the detailed description thereof will be omitted. The diagnosis unit 31 of the monitoring system 1 according to the fourth embodiment acquires the BC pressure measurement value indicating the value of the BC pressure detected by the BC 10 pressure sensor 17 and the AC pressure measurement value indicating the value of the AC pressure detected by the AC pressure sensor 16 from the brake control device 3 via the on-board wireless communication device 7, for example, when the determination unit 26 makes one of: the determination 15 that the door close information has been received; the determination that the predetermined first time has elapsed since the door close information was received; and the determination that the AC pressure continuously remains within the predetermined range of fluctuation width for a 20 certain period of time. That is, the diagnosis unit 31 of the monitoring system 1 according to the fourth embodiment acquires these BC and AC pressure measurement values from the brake control device 3 via the on-board wireless communication device 7 when the determination unit 26 25 determines that the AS pressure is in a stable state, . Then, the diagnosis unit 31 of the monitoring system 1 according to the fourth embodiment diagnoses an anomaly or a sign of an anomaly, using the BC pressure measurement value, the AC pressure measurement value, and a relational 30 expression indicating the correlation between the BC pressure and the AC pressure. [0096] FIG. 11 is a diagram illustrating an example of the tendency of the BC pressure measurement values and the 51 AC pressure measurement values within the first period. Note that, for example, the first period is a period on a one-day basis or a one-week basis or the like, but is not limited to a particular period. In FIG. 11, the BC 5 pressure measurement values and the AC pressure measurement values every time the determination unit 26 determines that the AS pressure is in a stable state are indicated by the “×” marks. In addition, in FIG. 11, a relational expression indicating the correlation between the BC 10 pressure and the AC pressure at the normal time is indicated by the solid line. The relational expression indicating the correlation between the BC pressure and the AC pressure can be represented as, for example, following expression (1). 15 AC pressure=a1×BC pressure+b1... (1) In expression (1), reference character “a1” denotes a proportional coefficient, and reference character “b1” denotes a hysteresis correction value. Note that the proportional coefficient a1 and the hysteresis correction 20 value b1 are attributable to and defined by the relay valve 14 and are set as appropriate according to the relay valve 14 to be used. [0097] In addition, for example, as illustrated in FIG. 11, the diagnosis unit 31 analyzes the tendency, performing 25 linear approximation indicating the correlation between the BC pressure measurement values and the AC pressure measurement values indicated by the “×” marks. Note that the way of analyzing the tendency of the BC pressure measurement values and the AC pressure measurement values 30 is not limited to a particular way, and a variety of statistical means can be used for the analysis of the tendency. In FIG. 11, the AC pressure measurement values tend to appear on a higher side of the relational 52 expression at the normal time. In other words, the BC pressure measurement values relative to the AC pressure measurement values are lower than the values at the normal time. In such a case, for example, the diagnosis unit 31 5 can diagnose that there is a possibility of leakage from the pipe of the relay valve 14 or the brake cylinder 24 to the atmosphere side for some reason. [0098] FIG. 12 is a diagram illustrating another example of the tendency of the BC pressure measurement values and 10 the AC pressure measurement values within the first period. In FIG. 12, similarly to FIG. 11, the BC pressure measurement values and the AC pressure measurement values every time the determination unit 26 determines that the AS pressure is in a stable state are indicated by the “×” 15 marks. In addition, in FIG. 12, similarly to FIG. 11, a relational expression indicating the correlation between the BC pressure and the AC pressure at the normal time is indicated by the solid line. [0099] For example, as illustrated in FIG. 12, the 20 diagnosis unit 31 analyzes the tendency, performing linear approximation indicating the correlation between the BC pressure measurement values and the AC pressure measurement values indicated by the “×” marks. In FIG. 12, the AC pressure measurement values tend to appear on a lower side 25 of the relational expression at the normal time. In other words, the BC pressure measurement values relative to the AC pressure measurement values are higher than the values at the normal time. In such a case, for example, the diagnosis unit 31 can diagnose that there is a possibility 30 that the supply air reservoir (SR) pressure leaks from the relay valve 14 into the pipe of the brake cylinder 24. [0100] FIG. 13 is a diagram illustrating an example of the upper limit values and the lower limit values of the AC 53 pressure based on the BC pressure measurement value used for diagnosis of an anomaly and a sign of an anomaly. In FIG. 13, a relational expression indicating the correlation between the BC pressure and the AC pressure at the normal 5 time is indicated by the solid line. In addition, in FIG. 13, relational expressions between the BC pressure and the AC pressure for setting the upper limit values and the lower limit values of the AC pressure based on the BC pressure measurement value for use in diagnosis of an 10 anomaly and a sign of an anomaly are indicated by the broken lines. [0101] The diagnosis unit 31 can obtain an AC pressure theoretical value by substituting the BC pressure measurement value into expression (1) indicating the 15 relational expression at the normal time and performing an arithmetic operation. A fifth upper limit value of the AC pressure, which serves as a reference for the diagnosis unit 31 to determine a sign of an anomaly, is a value set to be higher than the AC pressure theoretical value at the 20 normal time. In addition, a sixth upper limit value of the AC pressure, which serves as a reference for the diagnosis unit 31 to determine an anomaly, is a value set to be higher than the fifth upper limit value. In FIG. 13, for example, the fifth upper limit value of the AC pressure is 25 represented as AC pressure=a2×BC pressure+b2. The sixth upper limit value of the AC pressure is represented as AC pressure=a3×BC pressure+b3. The fifth upper limit value of the AC pressure and the sixth upper limit value of the AC pressure are set according to the BC pressure measurement 30 value. Note that the relational expressions for each upper limit value are set such that a3≥a2≥a1 and b3≥b2≥b1 hold. In the case of a2=a1, the relational expressions are set such that b2>b1 holds. In addition, in the case of b2=b1, 54 the relational expressions are set such that a2>a1 holds. Furthermore, in the case of a3=a2, the relational expressions are set such that b3>b2 holds. Likewise, in the case of b3=b2, the relational expressions are set such 5 that a3>a2 holds. [0102] Note that, in the case of a2>a1 in the relational expression for setting the fifth upper limit value of the AC pressure, the slope of the relational expression becomes larger than the slope of the relational expression at the 10 normal time. As the BC pressure measurement value becomes larger, therefore, the difference between the fifth upper limit value of the AC pressure and the AC pressure theoretical value also becomes larger. In addition, in the case of a3>a2 in the relational expression for setting the 15 sixth upper limit value of the AC pressure, the slope of the relational expression becomes larger than the slope of the relational expression for setting the fifth upper limit value of the AC pressure. As the BC pressure measurement value becomes larger, therefore, the difference between the 20 sixth upper limit value of the AC pressure and the fifth upper limit value of the AC pressure also becomes larger. Furthermore, in the case of a2=a1 in the relational expression for setting the fifth upper limit value of the AC pressure, the slope of the relational expression is the 25 same as the slope of the relational expression at the normal time. Regardless of the magnitude of the BC pressure measurement value, therefore, the difference between the fifth upper limit value of the AC pressure and the AC pressure theoretical value is always constant (b2- 30 b1). Likewise, in the case of a3=a2 in the relational expression for setting the sixth upper limit value of the AC pressure, the slope of the relational expression is the same as the slope of the relational expression for setting 55 the fifth upper limit value of the AC pressure. Regardless of the magnitude of the BC pressure measurement value, therefore, the difference between the sixth upper limit value of the AC pressure and the fifth upper limit value of 5 the AC pressure is always constant (b3-b2). [0103] In addition, as illustrated in FIG. 13, a fifth lower limit value of the AC pressure, which serves as a reference for the diagnosis unit 31 to determine a sign of an anomaly, is a value set to be lower than the AC pressure 10 theoretical value at the normal time. Furthermore, a sixth lower limit value of the AC pressure, which serves as a reference for the diagnosis unit 31 to determine an anomaly, is a value set to be lower than the fifth lower limit value. In FIG. 13, for example, the fifth lower limit value of the 15 AC pressure is represented as AC pressure=a4×BC pressure+b4. The sixth lower limit value of the AC pressure is represented as AC pressure=a5×BC pressure+b5. The fifth lower limit value of the AC pressure and the sixth lower limit value of the AC pressure are set according to the BC 20 pressure measurement value. Note that the relational expressions for each lower limit value are set such that a5≤a4≤a1 and b5≤b4≤b1 hold. In the case of a4=a1, the relational expressions are set such that b4d1 holds. In addition, in the case of d2=d1, the relational expressions are set such that c2>c1 holds. Furthermore, in the case of 10 c3=c2, the relational expressions are set such that d3>d2 holds. Likewise, in the case of d3=d2, the relational expressions are set such that c3>c2 holds. [0109] Note that, in the case of c2>c1 in the relational expression for setting the seventh upper limit value of the 15 BC pressure, the slope of the relational expression becomes larger than the slope of the relational expression at the normal time. As the AC pressure measurement value becomes larger, therefore, the difference between the seventh upper limit value of the BC pressure and the BC pressure 20 theoretical value also becomes larger. In addition, in the case of c3>c2 in the relational expression for setting the eighth upper limit value of the BC pressure, the slope of the relational expression becomes larger than the slope of the relational expression for setting the seventh upper 25 limit value of the BC pressure. As the AC pressure measurement value becomes larger, therefore, the difference between the eighth upper limit value of the BC pressure and the seventh upper limit value of the BC pressure also becomes larger. Furthermore, in the case of c2=c1 in the 30 relational expression for setting the seventh upper limit value of the BC pressure, the slope of the relational expression is the same as the slope of the relational expression at the normal time. Regardless of the magnitude 61 of the AC pressure measurement value, therefore, the difference between the seventh upper limit value of the BC pressure and the BC pressure theoretical value is always constant (d2-d1). Likewise, in the case of d3=d2 in the 5 relational expression for setting the eighth upper limit value of the BC pressure, the slope of the relational expression is the same as the slope of the relational expression for setting the seventh upper limit value of the BC pressure. Regardless of the magnitude of the AC 10 pressure measurement value, therefore, the difference between the eighth upper limit value of the BC pressure and the seventh upper limit value of the BC pressure is always constant (d3-d2). [0110] In addition, as illustrated in FIG. 14, a seventh 15 lower limit value of the BC pressure, which serves as a reference for the diagnosis unit 31 to determine a sign of an anomaly, is a value set to be lower than the BC pressure theoretical value at the normal time. Furthermore, an eighth lower limit value of the BC pressure, which serves 20 as a reference for the diagnosis unit 31 to determine an anomaly, is a value set to be lower than the seventh lower limit value. In FIG. 14, for example, the seventh lower limit value of the BC pressure is represented as BC pressure=c4×AC pressure+d4. The eighth lower limit value 25 of the BC pressure is represented as BC pressure=c5×AC pressure+d5. The seventh lower limit value of the BC pressure and the eighth lower limit value of the BC pressure are set according to the AC pressure measurement value. Note that the relational expressions for each lower 30 limit value are set such that c5≤c4≤c1 and d5≤d4≤d1 hold. In the case of c4=c1, the relational expressions are set such that d4
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 202227052821.pdf | 2022-09-15 |
| 2 | 202227052821-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [15-09-2022(online)].pdf | 2022-09-15 |
| 3 | 202227052821-STATEMENT OF UNDERTAKING (FORM 3) [15-09-2022(online)].pdf | 2022-09-15 |
| 4 | 202227052821-REQUEST FOR EXAMINATION (FORM-18) [15-09-2022(online)].pdf | 2022-09-15 |
| 5 | 202227052821-PROOF OF RIGHT [15-09-2022(online)].pdf | 2022-09-15 |
| 6 | 202227052821-POWER OF AUTHORITY [15-09-2022(online)].pdf | 2022-09-15 |
| 7 | 202227052821-FORM 18 [15-09-2022(online)].pdf | 2022-09-15 |
| 8 | 202227052821-FORM 1 [15-09-2022(online)].pdf | 2022-09-15 |
| 9 | 202227052821-FIGURE OF ABSTRACT [15-09-2022(online)].pdf | 2022-09-15 |
| 10 | 202227052821-DRAWINGS [15-09-2022(online)].pdf | 2022-09-15 |
| 11 | 202227052821-DECLARATION OF INVENTORSHIP (FORM 5) [15-09-2022(online)].pdf | 2022-09-15 |
| 12 | 202227052821-COMPLETE SPECIFICATION [15-09-2022(online)].pdf | 2022-09-15 |
| 13 | 202227052821-MARKED COPIES OF AMENDEMENTS [10-10-2022(online)].pdf | 2022-10-10 |
| 14 | 202227052821-FORM 13 [10-10-2022(online)].pdf | 2022-10-10 |
| 15 | 202227052821-AMMENDED DOCUMENTS [10-10-2022(online)].pdf | 2022-10-10 |
| 16 | 202227052821-ENDORSEMENT BY INVENTORS [23-11-2022(online)].pdf | 2022-11-23 |
| 17 | Abstract1.jpg | 2023-01-02 |
| 18 | 202227052821-FER.pdf | 2023-01-11 |
| 19 | 202227052821-FORM 3 [23-01-2023(online)].pdf | 2023-01-23 |
| 20 | 202227052821-FER_SER_REPLY [25-04-2023(online)].pdf | 2023-04-25 |
| 21 | 202227052821-DRAWING [25-04-2023(online)].pdf | 2023-04-25 |
| 22 | 202227052821-COMPLETE SPECIFICATION [25-04-2023(online)].pdf | 2023-04-25 |
| 23 | 202227052821-CLAIMS [25-04-2023(online)].pdf | 2023-04-25 |
| 24 | 202227052821-ABSTRACT [25-04-2023(online)].pdf | 2023-04-25 |
| 25 | 202227052821-FORM 3 [16-10-2023(online)].pdf | 2023-10-16 |
| 26 | 202227052821-PatentCertificate14-03-2024.pdf | 2024-03-14 |
| 27 | 202227052821-IntimationOfGrant14-03-2024.pdf | 2024-03-14 |
Search Strategy
| 1 | 202227052821E_11-01-2023.pdf |