DESC:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patent Rules, 2003
COMPLETE SPECIFICATION
(See sections 10 & rule 13)
1. TITLE OF THE INVENTION
A SYSTEM AND METHOD OF CALIBRATION OF INPUT DEVICES AND RAW DATA MONITORING IN DOZER EQUIPMENT
2. APPLICANT (S)
NAME NATIONALITY ADDRESS
BEML LIMITED IN BEML Soudha, No 23/1, 4th Main S.R. Nagar, Bengaluru- 560027, Karnataka, India.
3. PREAMBLE TO THE DESCRIPTION
COMPLETE SPECIFICATION

The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF INVENTION:
[001] The present invention relates to the field of bulldozer monitoring system. The present invention in particular relates to a system and method of calibration of input devices and raw data monitoring in Dozer equipment.
DESCRIPTION OF THE RELATED ART:
[002] Dozer is off-highway equipment used for operation in dozing activities in mainly open cast coal & non coal mines, construction sites and for disaster management etc. Dozers are equipped with instrumentation system consisting of conventional round gauge (fig7) for each parameter (or) latest LCD display based instrumentation. Conventional round gauge instrumentation (or) LCD display based instrumentation provides operator continuously present state of equipment’s critical parameters & the equipment.
[003] The Dozer equipment provided with LCD based human machine interface (HMI) strategically mounted in dashboard in such a way that it is in full view of operator. The display equipped with several screens for displaying parameters in analog/digital forms.
[004] Reference may be made to the following:
[005] Publication No. US2010261526 provides human interaction with a computer, including human control of three-dimensional input devices, force feedback, and force input. There are a number of applications, simulations, and games that simulate sculpting including those that utilize chisels, knives, drills, razors, clippers, jackhammers, oil rigs, lasers, high-pressure water cannons, scalpels, blades, back hoes, bulldozers, sandblasters, shovels, picks, axes, post-hole diggers, awls, hoes, hammers, ice cream scoops, scrapers, fine instruments like toothpicks, or body parts such as hands and fingers, and any other objects, processes, or materials that can remove material from objects or surfaces in order to achieve an intended design. Surfaces which can be sculpted include rock, marble, sand, dirt, stone, wood, plastic, tooth-material, bone, ivory, metal, clay, mud, turf, grass, soil, flesh, hair, fur, or any other surface.
[006] IN Publication No. 201914018460 relates to A working machine joystick assembly controls a working machine of the type having a body, a working arm attached to the body, a working implement attached to a distal end of the working arm, and a drive arrangement for propelling the working machine. The joystick assembly includes: a controller configured and arranged to control a plurality of functions of a working machine; a first electronic joystick in communication with the controller; and a plurality of actuators in communication with the controller, each actuator configured to actuate a function associated with a working arm of a working machine; wherein the first electronic joystick comprises four axes of movement, and wherein the first electronic joystick is configured to transmit electronic signals to the controller in response to being displaced along an axis from a neutral position; wherein the controller is configured to receive the electronic signals from the first electronic joystick, and to transmit an electrical signal to one or more of the plurality of actuators to actuate said actuators; and wherein the joystick assembly is configured such that the controller actuates a different actuator for controlling a different function associated with the working arm, dependent upon the axis of displacement of the first electronic joystick.
[007] IN Publication No. 202117051841 relates to The electronic control unit includes a memory including computer executable instructions for recognizing a ground engaging tool and a processor coupled to the memory and configured to execute the computer executable instructions the computer executable instructions when executed by the processor cause the processor to: determine a dimension of a ground engaging tool installed on a work tool compare the determined dimension of the ground engaging tool installed on a work tool to the theoretical dimension of a new ground engaging tool installed on the work tool and calculate the difference between the determined dimension and the theoretical dimension.
[008] IN Publication No. 704/CHE/2009 relates to BEML has successfully engineered Radio Control System on 90 hp Dozer to model BD50 and subjected to rigorous functional tests to ensure precise maneuvers. This system provides method of controlling machine without physical connection between the operator and the machine. It enables the operator to perform complete vehicle operations from a distance at any time from any position. Hence the radio control technology when integrated with vehicle makes possible to deploy the Dozer in the environment without any potential risk to the operator. With this technology development, BEML is in a position to provide total solution for wireless automatic control of the machine to meet specific requirement of various agencies.
[009] Publication No. US20160348341 provides an outrigger and dozer control device of a construction machine which includes one or more outriggers and one or more dozers, the device comprising: an actuator which drives outriggers or dozers of a vehicle; a first key input means which can select one of an outrigger set and a dozer set; a second key input means which can specifically select an outrigger or a dozer; a screen display unit which displays a selected outrigger or dozer while a specific outrigger or a dozer is being selected by the first key input means and the second key input means; and a control unit which receives a selection of an outrigger and a dozer from the first key input means and the second input means and controls an actuator of each selected outrigger and each selected dozer. The present invention simplifies the equipment operation environment for a worker and makes the equipment operation more convenient and easier.
[010] Publication No. CN102373724 discloses a bulldozer control system, which comprises a controller local network controller area network (CNA) bus, an intelligent monitor, an engine electronic control unit (ECU), an electric control handle, a center controller and a global positioning system (GPS) controller, wherein the intelligent monitor is accessed into the CAN bus, the GPS controller is used for obtaining position parameters and time parameters, the engine ECU is used for collecting operation parameters and fault parameters of a bulldozer engine in real time, the center controller is used for collecting operation parameters and fault parameters of each electric component of the bulldozer in real time, the intelligent monitor is used for obtaining various parameters transmitted onto the CAN bus by the GPS controller, the engine ECU and the center controller, and displaying each parameter. In the technical scheme, various parameters of the bulldozer are transmitted to the intelligent monitor to display in a uniform way, operators can conveniently and integrally know the state of the bulldozer, and further, the corresponding unified control and management is carried out.
[011] Publication No. US20050085929 relates to an operator interface for a work machine having a machine display system and a mechanical linkage is disclosed. The interface includes an input device having a series of input mechanisms that are adapted to generate a linkage input signal to control the motion of the mechanical linkage and that are adapted to generate a display input signal to input information to the machine display system. A control module is adapted to operate in a linkage control mode, where the motion of the mechanical linkage is controlled, and a display control mode, where the input of information to the machine display system is controlled. A switch may also be associated with the interface. The switch may be adapted to switch the operating mode between the linkage control mode and the display control mode.
[012] Publication No. US20080270074 discloses a data acquisition system for a machine. The data acquisition system has at least one sensor disposed on a machine and configured to produce a signal indicative of a value of an operational condition of the machine. The system also has a controller communicatively coupled to the at least one sensor. The controller is configured to receive a user-defined event associated with operation of the machine, and receive a user-defined trigger corresponding to the event. The controller is also configured to receive a user-defined parameter to be reported upon triggering of the event, and report an occurrence of the event and a value of the user-defined parameter based on the signal.
[013] Generally, a separate data logger unit apart from HMI is provided in mining equipments for logging of power train’s vital data to monitor health. Present technologies represent the parameter monitoring by using mono chrome displays. Monochrome displays only represent parameters but generally they are not equipped with features such as calibration of sensors, monitoring of raw values, raw CAN data logging etc. The conventional way of using individual gauges in the instrumentation panel (fig. 7) does not offer any benefit except parameter monitoring.
[014] The above listed prior art are the way data is represented in HMI/indicating devices, whereas the present invention aims to provide a system and method of calibration of input devices and raw data monitoring in Dozer equipment. The present invention covers the way and manner a) the machine health raw data (voltages, current, resistance and true/false status conditions) acquisition & presentation, b) the provision of onboard calibration of sensors & control devices (joystick) measurement and display of raw data.
OBJECTS OF THE INVENTION:
[015] The principal object of the present invention is to provide a system and method of calibration of input devices and raw data monitoring in dozer equipment.
[016] Yet another object of the present invention is to provide a bulldozer monitoring system which enables operator/service engineers to perform insitu calibration of pressure sensors on the equipment, without usage of any external calibrator.
[017] Still another object of the present invention is to provide a bulldozer monitoring system which provides real time data of sensors/valves/switches without using external measuring instrument such as multi meter or any other tools.
SUMMARY OF THE INVENTION:
[018] The present invention relates to a system and method of calibration of input devices and monitoring of parameter raw data in terms of voltages/currents/resistance in dozer display. This is a bulldozer monitoring system in the equipment and enables operator/service engineers to perform insitu calibration of input devices on the equipment, without usage of any external calibrator. The input devices are onboard viz. Transmission pressure sensors & Transmission joystick.
[019] The system provides real time data of sensors/ valves/ switches without using external measuring instrument such as multi meter or any other measuring tools.
BREIF DESCRIPTION OF THE INVENTION
[020] It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments.
[021] Figure 1, 2 and 3 shows HMI display screens;
[022] Figure 4 shows calibration window;
[023] Figure 5 shows sensors to sense inside pressure in the clutch responsible for gear selection in the transmissionon;
[024] Figure 6 shows trouble shooting screen;
[025] Figure 7 shows cconventional dash board;
[026] Figure 8 shows calibration flow chart;
[027] Figure 9 shows block diagram;
[028] Figure 10 shows trouble shooting flow chart;
[029] Figure 11 shows calibration command window before calibration;
[030] Figure 12 shows Troubleshooting screen;
[031] Figure 13 shows calibration command window after calibration;
[032] Figure 14 shows Dummy pressure of Main Pressure sensor;
[033] Figure 15 shows Main Pressure sensor’s dummy pressure nullified.
DETAILED DESCRIPTION OF THE INVENTION:
[034] The present invention provides a system and method of calibration of input devices and monitoring of parameter raw data in terms of voltages/ currents/ resistance in dozer display. This is a bulldozer monitoring system in the equipment and enables operator/service engineers to perform insitu calibration of input devices on the equipment, without usage of any external calibrator. The input devices are onboard viz. Transmission pressure sensors & Transmission joystick.
[035] The system provides real time data of sensors/ valves/ switches without using external measuring instrument such as multi meter or any other measuring tools.
[036] In the HMI display screens Fig(1),(2),(3), power train and equipment’s vital parameters viz engine oil pressure, engine oil pressure, engine water temperature, engine speed & equipment hours, engine oil temperature, voltmeter, transmission oil pressure, fuel level, torque converter oil temperature, transmission current gear, transmission oil temperature, engine coolant level, battery charging status, transmission clutch pressures and data logging & fault logging of all the above listed parameters etc. The parameters are received by the display(202) from ECU(203), Engine controller and other controller’s in real time over communication protocol for displaying purpose.
[037] Fig. 9 depicts the block diagram of the system, where in when power supply (201) is turned on then display (202) and ECU (203) turn ON. CAN (205) communication link b/w Display (202) and ECU (203) gets established when power supply (201) is ON and CAN (205) is responsible for data sharing b/w display (202) and ECU (203). Pressure sensors (204) are for monitoring of various clutch pressures. Pressure sensors (204) always measure the individual clutch pressures and transmit the pressure feedback to ECU (203). Similarly, Transmission Joystick (206) is used to for Dozer movement and steering. Transmission Joystick (206) and pressure sensors (204) are part of Transmission system.
[038] The input devices in the present invention are pressure sensors (204), Transmission joystick (206). Fig(4) depicts design & presentation of calibration screen wherein electrical data received by ECU(203) in real time from sensors. Fig11 depicts the real time calibration screen extracted from Dozer.
[039] In fig. 5, pressure sensors constitute a bunch of sensors for monitoring Transmission system pressures. They are F pressure sensor (5a), R pressure sensor (5b), 2 pressure sensor (5c), 1 pressure sensor (5d), L pressure sensor (5e) & H pressure sensor (5f) are placed to sense inside pressure in the clutch responsible for gear selection in the transmission. The sensors measure real time pressures being developed inside the Transmission system and transmit pressure data to ECU(203) for closed loop control. Dozer equipment generally tend to produce low frequency vibrations coupled with dusty conditions, the pressure sensors (204) may generate offset pressure when really there is no real pressure in the Transmission system causing non-functioning of closed loop control system.
[040] Offset generated in pressure sensors can be nullified in the control loop by the way of recalibration of range in the controller. The standard way of recalibrating the sensor is to connect a laptop equipped with service software wherein the offset can be measured, corrected in the calibration profile & then loading the revised calibration profile into controller. The offset affected sensor can be recalibrated provided the offset is within the correctable range.
[041] In the present invention, the process of calibration of the offset affected sensor is incorporated in the display itself.
[042] As shown in (fig4), the calibration window is provided on display (202). The calibration window (fig4) is basically password protected. Once the calibration window is opened, the window does have various check boxes for various parameters like F pressure sensor, R pressure sensor, main pressure sensor, left steering and right steering etc. When anyone parameter of this calibration window is pressed and released by user, then corresponding calibration request in terms of hex code will go to ECU (203). In turn ECU (203) will recognise the hex code and ECU (203) will nullify the offset pressure if any in the respective parameter and ECU(203) provides an acknowledgement to display(202) in green colour. To elaborate this further, when ‘F pressure sensor’ tab is pressed, its corresponding hex code ‘F6’ under the Parameter Group number (PGN) code 65421 goes to ECU(203). As per pre-program in the ECU(203), ECU(203) recognises the request and ECU(203) nullifies the offset pressure in the F pressure senor by treating current pressure value to zero and sensor output voltage will be considered as zero equivalent at that moment. Once calibration is completed, ECU(203) sends acknowledgement code ‘F6’ under the Parameter Group number (PGN) code 65420 back to display(202). After receiving acknowledgement code by display then display makes ‘F pressure sensor’ text field into green colour indicating that the ‘F pressure sensor’ is successfully calibrated. Table1 gives the list of Controller Area Network (CAN) data that is being shared b/w display and ECU (203)
Table 1:

[043] The above method has eliminated the usage of dedicated laptop based service tool for calibration purpose.
[044] The other claim of the present invention is, further in the display a provision of raw data measurement from each pressure sensor has been provided as has been indicated in Fig 6. Troubleshooting screen (fig6) data is transmitted from ECU (203) based on request from display (202). The display continuously sends Parameter Group number (PGN) code 65421, ‘byte position 1’ and ‘bit position1’ request to ECU (203) which in turn ECU (203) recognizes it and sends back data on various other custom defined Parameter Group number (PGN). The data received by display is in terms of voltage/current/true/false status which are directly indicating real time raw equivalent of all parameters. The complete PGN list is appended below in table 2.
Table 2

[045] Thus, the present invention provides presentation of all parameters in terms of electrical format like voltage/current, resistance & digital status for troubleshooting purposes. On board calibration of input devices viz pressure sensors (204) & Transmission joystick (206) are done without any external device.
[046] It is easy to carry troubleshooting using troubleshooting screen as fault codes are displayed carrying particular cause of the issue and feasible to perform calibration of potentiometric sensors & joysticks without usage of any external device like laptop, hand held calibration device etc. Presentation of raw data of parameters to ascertain functioning of input devices without usage of external tools like multi meter, clamp meter and frequency counter etc.
[047] Fig. 11 & Fig. 14 depicts the example case of how “Main pressure sensor” is calibrated if the concerned pressure sensor shows pressure value of more than 0 bar when engine is not running on Dozer equipment.
[048] Fig. 13 & Fig. 15 depicts the case when “Main pressure sensor” is calibrated and the offset/dummy pressure in the concerned pressure sensor is made 0bar.
[049] Fig. 12 depicts the raw values of all pressure sensors of transmission system in terms of voltages & currents and status of Transmission joystick switches.
[050] Material used in the present invention are power supply (201), display (202), ECU (203), pressure sensors (204), CAN communication (205) and Transmission Joystick (206)
[051] Numerous modifications and adaptations of the system of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the true spirit and scope of this invention.
,CLAIMS:WE CLAIM:
1. A bulldozer monitoring system in the equipment and enables operator/service engineers to perform insitu calibration of input devices on the equipment, without usage of any external calibrator comprises-
a) electronic control units with sensors providing electrical data real time to display;
b) pressure sensors, F pressure sensor (5a), R pressure sensor (5b), 2 pressure sensor (5c), 1 pressure sensor (5d), L pressure sensor (5e) & H pressure sensor (5f) are placed on Transmission system to sense inside pressure in the clutch responsible for gear selection in the transmission;
c) input devices;
d) HMI display screens wherein calibration of the offset affected sensor is incorporated in the display itself.
2. The bulldozer monitoring system, as claimed in claim 1, wherein the system provides real time data of sensors/valves/switches without using external measuring instrument such as multi meter or any other measuring tools.
3. The bulldozer monitoring system, as claimed in claim 1, wherein the sensors may generate offset pressure when really there is no pressure in the clutch causing nonfunctioning of closed loop control.
4. The bulldozer monitoring system, as claimed in claim 1, wherein offset generated in pressure sensors can be nullified in the control loop by the way of recalibration of range in the controller.
5. The bulldozer monitoring system, as claimed in claim 1, wherein once the calibration window is opened, the window does have various check boxes for various parameters like F pressure sensor, R pressure sensor, main pressure sensor, left steering and right steering etc and when anyone parameter of this calibration window is pressed and released by user, then corresponding calibration request in terms of hex code will go to ECU(203); in turn ECU(203) will recognize the hex code and ECU(203) will nullify the offset pressure if any in the respective parameter and ECU(203) provides an acknowledgement to display(202) in green color.