Claims:1. A system (100) for pressure calibration, said system comprising:
a blender (104) configured in a breathing apparatus (102), the blender (104) combines the fluid received from a source to form a mixture, the fluid is any or a combination of air and oxygen;
a pressure regulator (106, 132) configured in the apparatus, the pressure regulator (106, 132) regulates the flow of mixture;
a first valve (108) coupled to the pressure regulator (106), the first valve (108) are operated, upon receipt of a set of signals, to allow dispensation of the required flow at target pressure;
a second valve (110) coupled to the pressure regulator (132), the second valve (110) are operated, upon receipt of the set of signals, to allow dispensation to the target pressure; and
a controller (114) operatively coupled to the first valve 108, the second valve 110, the controller (114) operatively coupled to a memory, the memory storing instructions executable by the controller to:
generate, the set of signals pertaining to pulse width modulation (PWM) count; and
compute, from the generated set of signals, the pressure values for each of the generated set of signals,
wherein, based on determination of the computed pressure values for each of the generated set of signals, the controller (114) is configured to control the valves to allow dispensation of a predetermined quantity of the fluid at target pressure.
2. The system as claimed in claim 2, wherein the apparatus (102) comprises humidifier (124) coupled to a breathing circuit (122), the humidifier (124) adds any or a combination of moisture and warmth to the mixture.
3. The system as claimed in claim 1, wherein the apparatus comprises one or more sensors (112) that may include pressure sensors (126, 128) and flow sensor (130), wherein the pressure sensors (126, 128) monitor the pressure of the flow, and the flow sensor (130) monitors the flow from the apparatus.
4. The system as claimed in claim 1, wherein the controller (114) defines targeted pressure values for the valves with corresponding PWM counts, by finding the cracking point of the valves for calibration.
5. The system as claimed in claim 1, wherein calibration data containing the required PWM count and the corresponding pressure values is logged in an array.
6. The system as claimed in claim 6, wherein calibration data is validated and stored in a storage to be used during normal operation.
7. The system as claimed in claim 7, wherein the controller configured to set required PWM count for pumping the required pressure during normal operation.
8. The system as claimed in claim 1, wherein different makes of the valves having common specifications are employed for pressure calibration in inspiration and expiration process.
9. A method (400) for pressure calibration, the method comprising:
generating (402), at a computing device, the set of signals pertaining to pulse width modulation (PWM) count, the set of signals is received by a first valve (108) coupled to the pressure regulator (106), the first valve (108) are operated, upon receipt of the set of signals, to allow dispensation of the required flow at target pressure, a second valve (110) are operated, upon receipt of the set of signals, to allow dispensation to the target pressure, wherein a blender configured in a breathing apparatus, the blender combines the fluid received from a source to form the mixture, the pressure regulators regulates the flow of the mixture; and
computing (404), at the computing device, from the generated set of signals the pressure values for each of the generated set of signals,
wherein, based on determination of the computed pressure values for each of the generated set of signals, the computing device is configured to control (406) the valves to allow dispensation of a predetermined quantity of the fluid at target pressure.
, Description:TECHNICAL FIELD
[0001] The present disclosure relates, in general, to a health apparatus, and more specifically, relates to a means for pressure calibration using proportional valves in a breathing apparatus.

BACKGROUND
[0002] Breathing apparatus is a system that provides mechanical ventilation by acting as a bellow to move the air in and out of the respiratory organs to deploy previously unused components of the respiratory organs, to ensure sufficient breathing rate and maintain adequate oxygenation of the casualty blood, without causing trauma to the respiratory organs.
[0003] Few exemplary existing technologies in the field of breathing apparatus may employ intracuff pressure measurements, calibration module to perform one or more pressure drop calibration tests, and calibration process in which the value on output pressure is measured for a predetermined number of pressures across the range of the controller. However, these exemplary technologies suffer from the limitation of inaccurate calibration, and unreliable pressure calibration.
[0004] During manufacturing of the breathing apparatus, each device and calibration of the internal pressure sensors and valves is to be tested. The accuracy of the pressure calibration must be robust and have the best long-term stability to minimize re-calibration and maintenance. When the manufacturer decides to use different makes of proportional valves (when sufficient numbers of the same make valves are not available) for pressure inspiration, common qualifications of the valves are to be identified, performances of the different valves are to be analysed before use.
[0005] Breathing apparatus need to be calibrated before they can be used on a patient to avoid adverse side effects. It also needs to be re-calibrated periodically to ensure they are performing to established standards and manufacturer specifications. Calibrating breathing apparatus with test lung or lung simulators also helps medical staff to understand what to expect from the breathing apparatus and how each mode, in particular, will perform under real-world conditions.
[0006] Therefore, there is a need in the art to provide a means that provides pressure calibration of different makes of proportional valves by ensuring accurate, fast and reliable pressure calibration.

OBJECTS OF THE PRESENT DISCLOSURE
[0007] An object of the present disclosure relates, in general, to a health apparatus, and more specifically, relates to a means for pressure calibration using proportional valves in a breathing apparatus.
[0008] Another object of the present invention relates generally to the pressure calibration of different makes of proportional valves through a novel mechanism by ensuring accurate, fast and reliable pressure calibration.
[0009] Another object of the present invention is to provide a standard method that allows for the calibration of different makes of proportional control valves with common operating conditions but provide different pressure values at different voltage
[0010] Another object of the present invention is to provide a mechanism that can provide efficient, effective, reliable method for calibrating different proportional control valves by initializing the targeted pressure values during the start of the calibration.
[0011] Another object of the present disclosure finds the set or predefined cracking point of the valve opening by applying the pulse width modulation (PWM) count, once PWM count is found for the cracking point, the method computes the PWM count for the corresponding targeted values and logs them in an array effectively.
[0012] Another object of the present disclosure is to provide a system that can minimize the hysteresis in proportional valves, by reading the pressure values only in one direction to achieve good control and reputable valve performance.
[0013] Yet another object of the present disclosure is to provide a system that allows the calibration data to store in a persistent storage as a table for reference, targeted pressure value and its corresponding PWM count for pumping the required pressure during normal operation.

SUMMARY
[0014] The present disclosure relates, in general, to a health apparatus, and more specifically, relates to a means for pressure calibration using proportional valves in a breathing apparatus.
[0015] The present disclosure relates to a novel method for pressure calibration with different varieties of proportional valves, which are used in breathing apparatus. To use the novel method across different varieties of proportional valves, common qualification of the valves are identified, the performance of the different valves are analysed for pressure calibration. Initially, define the targeted pressure values for the valve and the cracking point of the valve. Apply PWM count starting from minimum value and increase in steps as defined, till it reaches the cracking point. Wait for the required settling time for each reading of pressure value. To minimize hysteresis in proportional valves, read the pressure value only in one direction to achieve good control and reputable valve performance. Once the cracking point is found, decrement the PWM count in steps as defined, to find the pressure value and find the next pressure value by following the above step. Increment the PWM count in steps as defined from cracking point to find the target pressure values.
[0016] For logging required pressure value, the PWM count is set to minimum and then to required PWM count to follow the feed-forward compensation to cancel out the hysteresis. The calibration data is logged in an array for the targeted pressure value and its corresponding PWM count applied. This data is finally validated for the forward slope of the pressure and PWM values and it is also stored in persistent storage to refer as a lookup table during normal operation of the breathing apparatus. The present disclosure can be described in enabling detail in the following examples, which may represent more than one embodiment of the present disclosure.
[0017] In an aspect, the present disclosure provides a system for pressure calibration, the system includes a blender configured in a breathing apparatus, the blender combines the fluid received from a source to form a mixture, the fluid is any or a combination of air and oxygen, a pressure regulator configured in the apparatus, the pressure regulator regulates the flow of mixture, a first valve coupled to the pressure regulator, the first valve are operated, upon receipt of a set of signals, to allow dispensation of the required flow at target pressure, a second valve coupled to the pressure regulator, the second valve are operated, upon receipt of the set of signals, to allow dispensation to the target pressure, a controller operatively coupled to the first valve, the second valve, the controller operatively coupled to a memory, the memory storing instructions executable by the controller to generate, the set of signals pertaining to pulse width modulation (PWM) count; and compute, from the generated set of signals, the pressure values for each of the generated set of signals, wherein, based on determination of the computed pressure values for each of the generated set of signals, the controller is configured to control the valves to allow dispensation of a predetermined quantity of the fluid at target pressure.
[0018] In another embodiment, the apparatus may include humidifier coupled to the breathing circuit, the humidifier adds any or a combination of moisture and warmth to the mixture.
[0019] In another embodiment, the apparatus may include one or more sensors that may include pressure sensors and flow sensor, wherein the pressure sensors monitor the pressure of the flow, and the flow sensor monitors the flow from the apparatus.
[0020] In another embodiment, the controller defines targeted pressure values for the valves with corresponding PWM counts, by finding the cracking point of the valves for calibration.
[0021] In another embodiment, calibration data containing the required PWM count and the corresponding pressure values is logged in an array.
[0022] In another embodiment, the calibration data may be validated and stored in a storage to be used during normal operation.
[0023] In another embodiment, the controller configured to set required PWM count for pumping the required pressure during normal operation.
[0024] In another embodiment, different makes of the valves having common specifications are employed for pressure calibration in inspiration and expiration process.
[0025] In an aspect, the present disclosure provides a method for pressure calibration, the method includes generating, at a computing device, the set of signals pertaining to pulse width modulation (PWM) count, the set of signals is received by a first valve coupled to the pressure regulator, the first valve are operated, upon receipt of the set of signals, to allow dispensation of the required flow at target pressure, a second valve are operated, upon receipt of the set of signals, to allow dispensation to the target pressure, wherein a blender configured in a breathing apparatus, the blender combines the fluid received from a source to form the mixture, the pressure regulators regulates the flow of the mixture, and computing, at the computing device, from the generated set of signals the pressure values for each of the generated set of signals, wherein, based on determination of the computed pressure values for each of the generated set of signals, the computing device is configured to control the valves to allow dispensation of a predetermined quantity of the fluid at target pressure.
[0026] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The following drawings form part of the present specification and are included to further illustrate aspects of the present disclosure. The disclosure may be better understood by reference to the drawings in combination with the detailed description of the specific embodiments presented herein.
[0028] FIG. 1A illustrates an exemplary representation of a system for pressure calibration, in accordance with an embodiment of the present disclosure.
[0029] FIG. 1B illustrates exemplary functional components of the breathing apparatus, in accordance with an embodiment of the present disclosure.
[0030] FIG. 2 illustrates exemplary flow diagram of a method used for pressure calibration in breathing apparatus, in accordance with an embodiment of the present disclosure.
[0031] FIGs. 3A-3B illustrate exemplary flow diagram of a method for determining pressure calibration, in accordance with an embodiment of the present disclosure.
[0032] FIG. 4 is an exemplary flow diagram illustrating a method for pressure calibration, in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[0033] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[0034] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0035] The present disclosure relates, in general, to a health apparatus, and more specifically, relates to a means for pressure calibration using proportional valves in a breathing apparatus.
[0036] The present disclosure relates to a method used for pressure calibration using proportional valves in a breathing apparatus, more specifically, the present disclosure relates a novel method used for pressure calibration having common specifications with different makes of proportional valves, which are critical to the well-being of the patient. The present disclosure relates to the breathing apparatus, where the novel method is derived by defining the targeted pressure values for the valve and finding the set or predefined cracking point of the valve opening.
[0037] The present disclosure relates to a novel method for pressure calibration with different varieties of proportional valves, which are used in breathing apparatus. To use the novel method across different varieties of proportional valves, common qualification of the valves are identified, the performance of the different valves are analysed for pressure calibration. Initially, define the targeted pressure values for the valve and the cracking point of the valve. Apply PWM count starting from minimum value and increase in steps as defined, till it reaches the cracking point. Wait for the required settling time for each reading of pressure value. To minimize hysteresis in proportional valves, read the pressure value only in one direction to achieve good control and reputable valve performance. Once the cracking point is found, decrement the PWM count in steps as defined, to find the pressure value and find the next pressure value by following the above step. Increment the PWM count in steps as defined from cracking point to find the target pressure values.
[0038] For logging required pressure value, the PWM count is set to minimum and then to required PWM count to follow the feed-forward compensation to cancel out the hysteresis. The calibration data is logged in an array for the targeted pressure value and its corresponding PWM count applied. This data is finally validated for the forward slope of the pressure and PWM values and it is also stored in persistent storage to refer as a lookup table during normal operation of the breathing apparatus. The present disclosure can be described in enabling detail in the following examples, which may represent more than one embodiment of the present disclosure.
[0039] FIG. 1A illustrates an exemplary representation of a system for pressure calibration, in accordance with an embodiment of the present disclosure.
[0040] Referring to FIG. 1A, system 100 may be configured to perform pressure calibration with different makes of proportional valves in a health/breathing apparatus 102 to provide respiratory support to a patient/user. The breathing apparatus 102 may include blender 104, pressure regulators (106, 132), the valves (108, 110) also interchangeably referred to as first valve 108 and second valve 110, one or more sensors 112, a microcontroller/controller 114 and a power supply 116. The valves (108, 110) may include an inspiratory valve 108 and an expiratory valve 110. The one or more sensors 112 may include pressure sensors (126, 128) and flow sensor 130 as illustrated in FIG. 1B and described in detail below. The pressure sensors monitor the pressure of the flow, and the flow sensor monitors the flow from the apparatus. The present disclosure may provide pressure calibration of different makes of proportional valves through a novel mechanism by ensuring accurate, fast and reliable pressure calibration.
[0041] In an exemplary embodiment, the breathing apparatus 102 as presented in the example may include ventilator, insufflators and the like. As can be appreciated, the present disclosure may not be limited to this configuration but may be extended to other configurations. The present disclosure may be used in systems like health care, laser cutting, leak testing, fluid spraying or coating and the like, where the proportional control valves are used for pressure calibration.
[0042] The breathing apparatus 102 are critical for patient inspiration and expiration process. The present disclosure relates to a method used for pressure calibration using proportional valves in the breathing apparatus 102, more specifically the novel method used for pressure calibration with different makes of proportional valves which are critical to the well-being of the patient. It is the responsibility of the manufacturer of the breathing apparatus 102 to ensure the elements used to measure pressure are accurate, fast and reliable. It is also the responsibility of the manufacturer and medical staff to calibrate the breathing apparatus 102 periodically to maintain their performance.
[0043] FIG. 1B illustrates exemplary functional components of the breathing apparatus, in accordance with an embodiment of the present disclosure. As shown in FIG. 1B, the blender 104 configured to receive fluids from a source, where the fluids may be any or a combination of air and oxygen. The oxygen is administered to the patient/user with the air during inspiration in the breathing apparatus 102. The blender 104 adapted to combine the fluid to form the mixture and may be adjusted to achieve the desired pressure. The blender 104 may be coupled to the pressure regulator 106, which regulate the flow of the mixture and pressure. The pressure regulator 106 coupled to the inspiratory valve 108, where the inspiratory valve 108 may be operated, upon receipt of a set of signals, to allow dispensation of the required flow at target pressure. The pressure sensor 118 may monitor the pressure and its output may be sent to the microcontroller 114, which gives the feedback to the operator. The power supply 116 configured to provide power to the apparatus 102.
[0044] In another embodiment, the inspiratory valve 108 coupled to a breathing circuit 122 and to a humidifier 124. The output of the inspiratory valve 108 may be given to the breathing circuit 122 and the humidifier 124, which adds the moisture and warmth to the air/oxygen mixture for reducing the symptoms of dryness and congestion, and may improve comfort and compliance to the patient 120. The flow sensor 130 configured in the apparatus 102 may monitor and measure the air/oxygen flow before it reaches the patient 120.
[0045] The oxygen is the most common gas administered to patients along with the air during inspiration in the breathing apparatus 102. The mixing of air with oxygen is achieved by the blender 104, the blender 104 may be adjusted to achieve the desired pressure. The pressure regulator 106 may regulate the desired flow to the required flow to the patient and the pressure sensor 126 may monitor the pressure and its output is sent to the microcontroller 114 which gives the feedback to the operator to adjust the mixture, or alarms if there is a discrepancy between the set and delivered flow.
[0046] In another embodiment, the volume that passes through the inspiratory valve 108 also interchangeably referred to as output proportional control valve 108 of breathing apparatus 102 is never exactly equal to the volume delivered to the patient as the volume may be compressed in the breathing circuit 122. Further, the mixture is passed through the humidifier 124, which adds moisture and warmth to the air delivered by the device to reduce the symptoms of dryness and congestion and to improve comfort and compliance to the patient.
[0047] In another embodiment, the flow changes may be detected by the flow sensor 130 in the patient circuit. Directing flow from the source gas into the patient requires the coordination of the inspiratory valve 108 also interchangeably referred to as output flow-control valve 108 and the expiratory valve 110 or “exhalation manifold”. For example, when inspiration is triggered on, the output control valve 108 opens, and the expiratory valve 110 closes, and the only path left for gas is into the patient. When inspiration is cycled off, the output valve 108 closes and the exhalation valve 110 opens, flow from the ventilator ceases and the patient exhales out through the expiratory valve 110. The pressure sensors (126, 128) monitor the pressure and its output is sent to the microcontroller 114.
[0048] In an exemplary implementation, the blender 104 may combine the fluid received from the source to form the mixture, the fluid may be any or a combination of air and oxygen. The pressure regulator (106, 132) regulates the flow of mixture. The valves (108, 110) coupled to the pressure regulator (106, 132), the first valve 108 are operated, upon receipt of the set of signals, to allow dispensation of the required flow at target pressure. The second valve 110 coupled to the pressure regulator 132, the second valve 110 are operated, upon receipt of the set of signals, to allow dispensation to the target pressure. The controller 114 operatively coupled to the valves (108, 110), the controller 114 operatively coupled to a memory 134, the memory 134 storing instructions executable by the controller 114 to generate, the set of signals pertaining to pulse width modulation (PWM) count.
[0049] The controller 114 may compute, from the generated set of signals, the pressure values for each of the generated set of signals. The controller 114 may be configured to control the valves (108, 110) to allow dispensation of a predetermined quantity of the fluid at target pressure based on the determination of the computed pressure values for each of the generated set of signals. For example, if the patient is making a breath attempt, the controller 114 may indicate that more pressure is needed. If the patient is exhaling, the controller 114 may indicate that less pressure is needed.
[0050] In another embodiment, the controller 114 may define targeted pressure values for the valve 110 that is used for pressure control with corresponding PWM counts, by finding the cracking point of the of the valves for calibration. The calibration data containing the required PWM count and the corresponding pressure values are logged in an array. The calibration data is stored in a storage, for example, persistent storage to be used during normal operation. The controller 114 may be configured to set the required PWM count for pumping the required pressure during normal operation.
[0051] In another embodiment, the one or more processor(s)/controllers 114 can be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, logic circuitries, and/or any devices that manipulate data based on operational instructions. Among other capabilities, the one or more processor(s) are configured to fetch and execute computer-readable instructions stored in a memory 134 of the system 100. The memory 134 can store one or more computer-readable instructions or routines, which may be fetched and executed to create the data. The memory 134 can include any non-transitory storage device including, for example, volatile memory such as RAM, or non-volatile memory such as EPROM, flash memory, and the like.
[0052] Thus, the system 100 can provide pressure calibration of different makes of proportional valves through a novel mechanism by ensuring accurate, fast and reliable pressure calibration. The present disclosure provides a standard method that allows for the calibration of different makes of proportional control valves with common operating conditions but provides different pressure values at a different voltage. The system 100 can provide an efficient, effective, reliable method for calibrating different proportional control valves by initializing the targeted pressure values during the start of the calibration. Further, the hysteresis in the proportional valves can be minimized by reading the flow value only in one direction to achieve good control and reputable valve performance.
[0053] FIG. 2 illustrates exemplary flow diagram of a method used for pressure calibration in breathing apparatus, in accordance with an embodiment of the present disclosure.
[0054] Referring to FIG. 2, define the targeted pressure values for the valve 110 that is used for pressure control and cracking point of the valve 110 that is used for pressure control. The PWM count may be applied starting from minimum value and increase in steps as defined, till it reaches the cracking point. Once cracking point is found, decrement the PWM count in steps as defined, to find the pressure value and find the next pressure value by following the above step. Increment the PWM count in steps as defined from cracking point to find the target pressure values. For logging required pressure value, the PWM count is set to minimum and then to required PWM count to follow the feed-forward compensation to cancel out the hysteresis. This data is finally validated for the forward slope of the pressure and PWM values and it is also stored in persistent storage to refer as a lookup table during normal operation of the breathing apparatus 102.
[0055] In another embodiment, the one or more processor(s)/controllers 114 can be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, logic circuitries, and/or any devices that manipulate data based on operational instructions. Among other capabilities, the one or more processor(s) are configured to fetch and execute computer-readable instructions stored in a memory 134 of the system 100. The memory 134 can store one or more computer-readable instructions or routines, which may be fetched and executed to create the data. The memory 134 can include any non-transitory storage device including, for example, volatile memory such as RAM, or non-volatile memory such as EPROM, flash memory, and the like.
[0056] In an embodiment, the breathing apparatus 102 may initialize the PWM count to minimum value and initialize the targeted pressure values to compute the table of pressure values and its corresponding PWM count during calibration to refer the table during normal operation of the breathing apparatus 102. The breathing apparatus 102 may read the pressure value during calibration by applying PWM count starting from minimum value in step of defined value, till it reaches the cracking point. It also waits for required settling time for each reading of pressure value for corresponding PWM count.
[0057] In another embodiment, the breathing apparatus 102 may decrement the PWM count in defined steps to find the previous targeted values from the cracking point and log the PWM count and its corresponding pressure values in the table. It also waits for required settling time for each reading of pressure value for corresponding PWM count.
[0058] In another embodiment, the breathing apparatus 102 continue to find the PWM count for the defined targeted pressure values by incrementing from the cracking point of the proportional valve and log all the targeted pressure values and its corresponding PWM counts in a table along with the cracking point and its corresponding PWM count. It also waits for required settling time for each reading of pressure value for corresponding PWM count.
[0059] In another embodiment, during calibration of the breathing apparatus 102, each PWM is going to minimum value and then it is set to the required PWM count to minimize the hysteresis in proportional valves, by reading the pressure values only in one direction to achieve good control and reputable valve performance. The breathing apparatus 102 during calibration the data is logged in the table for the targeted pressure values and its corresponding PWM counts applied. This data is finally validated for the forward slope of the pressure and PWM count and it is also stored in the persistent storage to refer as the lookup table during normal operation of the breathing apparatus 102.
[0060] FIGs. 3A-3B illustrate exemplary flow diagram of a method for determining pressure calibration, in accordance with an embodiment of the present disclosure.
[0061] Referring to FIG. 3A, the method 300 may define the targeted pressure values for the valve 110 that is used for pressure control and cracking point of the valve 110 that is used for pressure control. The PWM count may be applied starting from minimum value and increase in steps as defined, till it reaches the cracking point. Once cracking point is found, decrement the PWM count in steps as defined, to find the pressure value and find the next pressure value by following the above step. Increment the PWM count in steps as defined from cracking point to find the target pressure values. For logging required pressure value, the PWM count is set to minimum and then to required PWM count to follow the feed-forward compensation to cancel out the hysteresis. This data is finally validated for the forward slope of the pressure and PWM values and it is also stored in persistent storage to refer as a lookup table during normal operation of the breathing apparatus 102.
[0062] At block 302, initialize PWM count to minimum value and initialize 17 pressure target values from P1 to P17. Initialize the PWM count to minimum value and define the targeted pressure values for the valve and cracking point of the valve. At block 304, apply PWM count starting from minimum value and increase in steps as defined, till the cracking point, wait for required settling time for each reading of pressure value. To minimize hysteresis in proportional valves, read the pressure value only in one direction to achieve the good control and reputable valve performance.
[0063] At block 306, once cracking point is found, decrement the PWM count in steps as defined, to find the pressure value and find the next pressure value by following the above step. At block 308, each PWM count is set to minimum and then set the required PWM count. At block 310, increment the PWM count in steps as defined from cracking point to find the target pressure values. For logging required pressure value, the PWM count is set to minimum and then to required PWM count to follow the feed forward compensation to cancel out the hysteresis. At block 312, the calibration data is logged in the array for the targeted pressure value and its corresponding PWM count applied. This data is finally validated for the forward slope of the pressure and PWM values and it is also stored in the persistent storage to refer as lookup table during normal operation of the breathing apparatus 102.
[0064] In an embodiment, the breathing apparatus 102 need to be calibrated before they can be used on the patient to avoid adverse side effects. It also needs to be re-calibrated periodically to ensure they are performing to established standards and manufacturer specifications. Calibrating breathing apparatus 102 with test lung or lung simulators also helps medical staff to understand what to expect from the breathing apparatus 102 and how each mode, in particular, may perform under real-world conditions.
[0065] FIG. 4 is an exemplary flow diagram illustrating a method for pressure calibration, in accordance with an embodiment of the present disclosure.
[0066] The method 400 can be implemented using a computing device, which can include one or more processors/controllers. At block 402, the computing device generates the set of signals pertaining to pulse width modulation (PWM) count, the set of signals may be received by a first valve 108, the first valve 108 is operated, upon receipt of the set of signals, to allow dispensation of the required flow at target pressure. The second valve 110 coupled to the pressure regulator 132, the valve 110 are operated, upon receipt of the set of signals, to allow dispensation to the target pressure. The blender configured in the breathing apparatus, the blender combines the fluid received from a source to form the mixture, the pressure regulator regulates the flow of the mixture.
[0067] At block 404, computing device, computes from the generated set of signals the pressure values for each of the generated set of signals. At block 406, based on determination of the computed pressure values for each of the generated set of signals, the computing device is configured to control the valves to allow dispensation of a predetermined quantity of the fluid at target pressure.
[0068] It will be apparent to those skilled in the art that the system 100 of the disclosure may be provided using some or all of the mentioned features and components without departing from the scope of the present disclosure. While various embodiments of the present disclosure have been illustrated and described herein, it will be clear that the disclosure is not limited to these embodiments only. Numerous modifications, changes, variations, substitutions, and equivalents will be apparent to those skilled in the art, without departing from the spirit and scope of the disclosure, as described in the claims.

ADVANTAGES OF THE PRESENT DISCLOSURE
[0069] The present disclosure provides pressure calibration of different makes of proportional valves through a novel mechanism by ensuring accurate, fast and reliable pressure calibration.
[0070] The present disclosure provides a system that allows for the calibration of different makes of proportional control valves with common operating conditions but provide different pressure values at different voltage
[0071] The present disclosure provides a system that can provide efficient, effective, reliable method for calibrating different proportional control valves by initializing the targeted pressure values during the start of the calibration.
[0072] The present disclosure finds the set or predefined cracking point of the valve opening by applying the pulse width modulation (PWM) count, once PWM count is found for the cracking point, the method computes the PWM count for the corresponding targeted values and logs them in an array effectively.
[0073] The present disclosure provides a system that allows the calibration data to store in persistent storage as a table for reference, targeted pressure value and its corresponding PWM count for pumping the required pressure during normal operation.
[0074] The present disclosure provides a system that can minimize the hysteresis in proportional valves, by reading the pressure values only in one direction to achieve good control and reputable valve performance.