Hydrogen leakage fault diagnosis method, system, device and computer readable storage medium

Abstract

A method, system, device, and computer-readable storage medium for diagnosing hydrogen leak faults are disclosed, relating to the field of hydrogen fuel cell vehicles. Specifically, the method includes determining the hydrogen leak fault status of a safety valve based on the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply from the pressure reducing valve, and the hydrogen consumption of the fuel cell system; and determining the hydrogen leak fault status of the fuel cell stack based on the hydrogen consumption of the fuel cell system, the hydrogen consumption of the fuel cell stack, and the hydrogen release from the exhaust valve. This application enables real-time and accurate hydrogen leak fault diagnosis.

Description

Technical Field

[0001] This application relates to the field of hydrogen fuel cell vehicles, specifically to a method, system, device, and computer-readable storage medium for diagnosing hydrogen leakage faults. Background Technology

[0002] With the gradual promotion of hydrogen fuel cell commercial vehicles, the application of hydrogen as a clean energy source is receiving increasing attention. Hydrogen fuel cell systems are widely used in electric vehicles, where hydrogen is used as the anode gas supplied to the anode of the fuel cell. During the operation of the fuel cell system, aging of the proton exchange membrane and changes in other system components may lead to hydrogen leakage, including leakage from the anode to the cathode, or from the anode to the cooling system connected to the fuel cell stack. In addition, changes in pressure reducing valves, safety valves, and pipe connections in the on-board hydrogen storage system may also cause hydrogen leakage of varying degrees. Excessive hydrogen leakage can result in excessively high hydrogen concentrations in the tailpipe and inside the on-board hydrogen storage system, posing safety hazards. Therefore, the detection and diagnosis of hydrogen leaks are particularly important.

[0003] Currently, existing methods mainly obtain the value of the pressure change over time and integrate the value of the change to obtain the integral value of the hydrogen leakage. The difference between the integral values ​​of hydrogen leakage obtained at two different times in the time interval is used to determine whether a hydrogen leakage event has occurred. However, this method relies on the coordination between valves when the fuel cell system is in the off state, which means that it cannot be detected when the system is running. Furthermore, it cannot determine whether the leakage is from the fuel cell stack or a valve, which leads to the inability to accurately monitor the leakage of the hydrogen storage system.

[0004] Therefore, how to provide a hydrogen leak fault diagnosis method to achieve real-time and accurate hydrogen leak fault diagnosis is an urgent problem to be solved. Summary of the Invention

[0005] This application provides a hydrogen leak fault diagnosis method, system, device, and computer-readable storage medium, which can achieve real-time and accurate hydrogen leak fault diagnosis.

[0006] In a first aspect, embodiments of this application provide a method for diagnosing hydrogen leakage faults, the method comprising: The hydrogen leakage fault status of the safety valve is determined based on the target pressure between the bottle valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system. The hydrogen leakage fault status of the fuel cell stack is determined based on the amount of hydrogen used in the fuel cell system, the amount of hydrogen used in the fuel cell stack, and the amount of hydrogen released by the exhaust valve.

[0007] In conjunction with the first aspect, in one embodiment, determining the hydrogen leakage fault state of the safety valve based on the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system includes: When the vehicle is stationary for a preset time, the safety valve’s hydrogen leakage fault status is determined based on the target pressure drop and the preset drop threshold. When the gas-fired power system uses hydrogen, the hydrogen leakage fault status of the safety valve is determined based on the hydrogen supply of the pressure reducing valve and the hydrogen consumption of the gas-fired power system.

[0008] In conjunction with the first aspect, in one implementation, determining whether the hydrogen leakage fault state of the safety valve is a static hydrogen leakage fault based on the decrease in target pressure and a preset decrease threshold includes: If the detected drop in target pressure is greater than the preset drop threshold, the hydrogen leakage fault status of the safety valve is determined to be a static hydrogen leakage fault. If the detected drop in target pressure is not greater than the preset drop threshold, it is determined that the safety valve does not have a static hydrogen leakage fault.

[0009] In conjunction with the first aspect, in one embodiment, determining whether the hydrogen leakage fault state of the safety valve is a dynamic hydrogen leakage fault based on the hydrogen supply from the pressure reducing valve and the hydrogen consumption of the fuel-electric system includes: The first hydrogen quantity difference is determined based on the hydrogen supply from the pressure reducing valve and the hydrogen consumption of the gas-fired power system. If the first hydrogen quantity difference is greater than the preset first difference threshold, the hydrogen leakage fault state of the safety valve is determined to be a dynamic hydrogen leakage fault. If the first hydrogen quantity difference is not greater than the preset first difference threshold, it is determined that the safety valve does not have a dynamic hydrogen leakage fault.

[0010] In conjunction with the first aspect, in one embodiment, determining the hydrogen leakage fault state of the fuel cell stack based on the hydrogen consumption of the fuel cell system, the hydrogen consumption of the fuel cell stack, and the hydrogen release from the exhaust valve includes: The second hydrogen quantity difference is determined based on the hydrogen consumption of the gas-fired power system, the hydrogen release from the exhaust valve, and the hydrogen consumption of the fuel cell stack. If the second hydrogen quantity difference is greater than the preset second difference threshold, the hydrogen leakage fault status of the fuel cell stack is determined to be a hydrogen leakage fault. If the second hydrogen quantity difference is not greater than the preset second difference threshold, it is determined that there is no hydrogen leakage fault in the fuel cell stack.

[0011] In conjunction with the first aspect, in one embodiment, prior to the step of determining the hydrogen leakage fault state of the safety valve based on the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system, the method further includes: The hydrogen supply of the pressure reducing valve is determined based on the preset pressure reducing valve flow coefficient, target pressure, first pressure between the pressure reducing valve and the proportional valve, preset gas specific gravity, preset unit conversion factor, preset gas compressibility factor, and first real-time temperature of the gas at the cylinder valve. The flow coefficient under the preset opening is determined based on the preset opening degree, the preset proportional valve adjustable ratio, and the preset proportional valve fully open flow coefficient. The amount of hydrogen used in the fuel cell system is determined based on the flow coefficient at a preset opening degree, the preset gas specific gravity, the preset unit conversion factor, the preset gas compressibility factor, the first pressure between the pressure reducing valve and the proportional valve, the second pressure between the proportional valve and the fuel cell stack, and the second real-time temperature between the pressure reducing valve and the proportional valve, wherein the first pressure is greater than the second pressure.

[0012] In conjunction with the first aspect, in one embodiment, prior to the step of determining the hydrogen leakage fault state of the safety valve based on the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system, the method further includes: The amount of hydrogen used in the fuel cell stack is determined based on the stack's operating current, a preset Faraday constant, and a preset time unit conversion factor. The hydrogen release capacity of the exhaust valve is determined based on the real-time operating temperature of the fuel cell stack, the output voltage of the fuel cell stack, the preset expansion coefficient, the preset hydrogen release valve flow coefficient, the preset gas specific gravity, and the preset valve critical pressure difference ratio coefficient.

[0013] Secondly, embodiments of this application provide a hydrogen leak fault diagnosis system, the hydrogen leak fault diagnosis system comprising: The first processing module is used to determine the hydrogen leakage fault status of the safety valve based on the target pressure between the bottle valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system. The second processing module is used to determine the hydrogen leakage fault status of the fuel cell stack based on the amount of hydrogen used in the fuel cell system, the amount of hydrogen used in the fuel cell stack, and the amount of hydrogen released by the exhaust valve.

[0014] Thirdly, embodiments of this application provide a hydrogen leak fault diagnosis device, which includes a processor, a memory, and a hydrogen leak fault diagnosis program stored in the memory and executable by the processor. When the hydrogen leak fault diagnosis program is executed by the processor, it implements the steps of the hydrogen leak fault diagnosis method as described in any of the preceding claims.

[0015] Fourthly, embodiments of this application provide a computer-readable storage medium storing a hydrogen leak fault diagnosis program, wherein when the hydrogen leak fault diagnosis program is executed by a processor, it implements the steps of the hydrogen leak fault diagnosis method as described in any of the preceding claims.

[0016] The beneficial effects of the technical solutions provided in this application include: By comprehensively analyzing multi-dimensional data such as the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel cell system, the hydrogen leakage fault status of the safety valve can be determined by the hydrogen quantity and the pressure difference between the cylinder valve and the pressure reducing valve. Furthermore, by analyzing the difference between the hydrogen consumption of the fuel cell system and the hydrogen consumption of the fuel cell stack, combined with the hydrogen release from the exhaust valve, the hydrogen leakage fault status of the fuel cell stack can be accurately determined. This application, by real-time tracking of the pressure difference between the cylinder valve and the pressure reducing valve, as well as the hydrogen flow rate at various key nodes (such as the pressure reducing valve, the fuel cell system, and the fuel cell stack), can detect hydrogen leakage at any time. This avoids the shortcomings of traditional methods that cannot detect during system operation, improving the real-time performance and accuracy of monitoring. It can also effectively distinguish between the hydrogen leakage fault status of the safety valve and the fuel cell stack, improving the diagnostic accuracy of hydrogen leakage and providing a clear basis for maintenance and fault location. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating an embodiment of the hydrogen leakage fault diagnosis method of this application; Figure 2 This is a schematic diagram of the hydrogen circuit layout of a hydrogen fuel cell commercial vehicle in an embodiment of the hydrogen leakage fault diagnosis method of this application; Figure 3 This is a detailed flowchart illustrating an embodiment of the hydrogen leakage fault diagnosis method of this application; Figure 4 This is a schematic diagram of the hardware structure of the hydrogen leakage fault diagnosis device involved in the embodiments of this application. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0020] In a first aspect, embodiments of this application provide a method for diagnosing hydrogen leakage faults.

[0021] In one embodiment, reference is made to Figure 1 , Figure 1 This is a flowchart illustrating an embodiment of the hydrogen leakage fault diagnosis method of this application. Figure 1 As shown, hydrogen leak fault diagnosis methods include: Step S10: Determine the hydrogen leakage fault status of the safety valve based on the target pressure between the bottle valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system.

[0022] As an example, in the embodiments of this application, reference is made to Figure 2 As shown, in the hydrogen storage system, the cylinder valve of the hydrogen storage cylinder controls the outflow of high-pressure hydrogen P1, which is then reduced to medium pressure P2 by the pressure reducing valve. During this process, a temperature sensor is installed between the cylinder valve and the pressure reducing valve to monitor the high-pressure hydrogen temperature T1 in real time, and a temperature sensor is installed at the output end of the pressure reducing valve to continuously monitor the medium-pressure hydrogen temperature T2. At the same time, the pressure reducing valve is connected to a safety valve to form an overpressure protection mechanism. When the system pressure exceeds the safety threshold, it automatically opens to discharge hydrogen to the atmosphere to ensure operational safety. Medium-pressure hydrogen then enters the fuel cell system, first being regulated to the required low pressure P3 by a proportional valve, and then undergoing an electrochemical reaction with oxygen in the fuel cell to generate electricity. Temperature sensors are installed in the fuel cell area to monitor the operating temperature T3 in real time. Unreacted hydrogen in the fuel cell is recycled by a circulating pump. At the same time, the system periodically controls the opening of the hydrogen discharge valve to discharge impurity gases and residual hydrogen to the atmosphere. Pressure sensors are installed at the fuel cell output end to monitor the discharge pressure P4 in real time. The entire hydrogen circuit is monitored by a monitoring network consisting of multiple pressure sensors (monitoring P1 to P4) and temperature sensors (monitoring T1 to T3) to collect data and monitor the status of hydrogen storage, depressurization, reaction and discharge in real time, ensuring the efficiency, safety and operational stability of hydrogen storage and utilization.

[0023] Specifically, the target pressure between the cylinder valve and the pressure reducing valve refers to the high-pressure hydrogen pressure (i.e., high pressure P1) between the cylinder valve outlet and the pressure reducing valve inlet in the hydrogen storage system. As the initial pressure parameter of the system, it directly reflects the hydrogen state inside the hydrogen storage cylinder. The hydrogen supply Y1 of the pressure reducing valve represents the amount of hydrogen flowing from the high-pressure system to the medium-pressure system through the pressure reducing valve. The hydrogen consumption Y2 of the gasification and power system represents the hydrogen consumption required for normal system operation. By calculating the difference between the hydrogen supply Y1 of the pressure reducing valve and the hydrogen consumption Y2 of the gasification and power system and comparing it with a preset threshold, the hydrogen leakage fault state of the safety valve can be accurately determined, thereby achieving accurate diagnosis of hydrogen leakage faults and solving the technical problem of not being able to monitor safety valve leakage in real time and accurately locate the leakage source in the existing technology.

[0024] Step S20: Determine the hydrogen leakage fault status of the fuel cell stack based on the amount of hydrogen used in the fuel cell system, the amount of hydrogen used in the fuel cell stack, and the amount of hydrogen released by the exhaust valve.

[0025] In this exemplary embodiment, the hydrogen consumption Y2 of the fuel cell system refers to the total actual hydrogen consumption of the entire fuel cell system; the hydrogen consumption X1 of the fuel cell stack is the theoretical hydrogen consumption, which represents the theoretical value of hydrogen required for the electrochemical reaction under ideal conditions; the hydrogen release X2 of the exhaust valve represents the amount of hydrogen released in a planned manner to maintain the purity of the hydrogen circuit; by establishing a mass conservation relationship, under normal operating conditions, the hydrogen consumption Y2 of the fuel cell system should be equal to the sum of the hydrogen consumption X1 of the fuel cell stack and the hydrogen release X2 of the exhaust valve. By judging the relationship between the difference of Y2-X2-X1 and the preset threshold, the hydrogen leakage fault state of the fuel cell stack can be accurately determined, so as to realize real-time monitoring and fault diagnosis of the sealing performance of the fuel cell stack.

[0026] This application comprehensively analyzes multi-dimensional data, including the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply from the pressure reducing valve, and the hydrogen consumption of the fuel cell system. By analyzing the hydrogen volume and the pressure difference between the cylinder valve and the pressure reducing valve, it can determine the hydrogen leakage fault status of the safety valve. By analyzing the difference between the hydrogen consumption of the fuel cell system and the hydrogen consumption of the fuel cell stack, combined with the hydrogen release from the exhaust valve, it can accurately determine the hydrogen leakage fault status of the fuel cell stack. This application, by tracking the pressure difference between the cylinder valve and the pressure reducing valve in real time, as well as the hydrogen flow rate at various key nodes (such as the pressure reducing valve, the fuel cell system, and the fuel cell stack), can detect hydrogen leakage at any time. This avoids the shortcomings of traditional methods that cannot detect leaks while the system is running, improving the real-time performance and accuracy of monitoring. Furthermore, it can effectively distinguish between the hydrogen leakage fault status of the safety valve and the fuel cell stack, improving the accuracy of hydrogen leakage diagnosis and providing a clear basis for maintenance and fault location.

[0027] Further, in one embodiment, determining the hydrogen leakage fault state of the safety valve based on the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system includes: When the vehicle is stationary for a preset time, the safety valve’s hydrogen leakage fault status is determined based on the target pressure drop and the preset drop threshold. When the gas-fired power system uses hydrogen, the hydrogen leakage fault status of the safety valve is determined based on the hydrogen supply of the pressure reducing valve and the hydrogen consumption of the gas-fired power system.

[0028] As an example, in this embodiment, the specific value of the preset duration can be determined according to actual needs and is not limited here. For example, it can preferably be several hours to several days to ensure that the potential leakage effect is fully reflected. The specific value of the preset drop threshold can be determined according to actual needs and is not limited here. After the vehicle has been stationary for a preset duration, the pressure drop ΔP is calculated by accurately measuring the change in the pressure value before and after the stationary period. The drop directly reflects the degree of hydrogen loss of the high-pressure system in the non-working state. The hydrogen leakage fault state of the safety valve is determined to be a static hydrogen leakage fault by comparing the magnitude of the drop in the target pressure with the preset drop threshold.

[0029] It should be understood that when the fuel cell system is in normal operation and consumes hydrogen, based on the principle of mass conservation, the hydrogen supply Y1 of the pressure reducing valve should be basically equal to the hydrogen consumption Y2 of the fuel cell system (with only a small loss allowed by the system design). Therefore, the hydrogen leakage fault state can be determined by judging the relationship between the difference between the two and a preset threshold. This diagnostic method makes full use of the real-time parameter differences during system operation to achieve online monitoring of the sealing performance of the safety valve without affecting the normal operation of the vehicle, thus realizing real-time and accurate diagnosis of hydrogen leakage during the operation of hydrogen fuel cell commercial vehicles.

[0030] Further, in one embodiment, determining whether the hydrogen leakage fault state of the safety valve is a static hydrogen leakage fault based on the decrease in target pressure and a preset decrease threshold includes: If the detected drop in target pressure is greater than the preset drop threshold, the hydrogen leakage fault status of the safety valve is determined to be a static hydrogen leakage fault. If the detected drop in target pressure is not greater than the preset drop threshold, it is determined that the safety valve does not have a static hydrogen leakage fault.

[0031] As an example, in this embodiment of the application, if the detected drop in target pressure is greater than a preset drop threshold, it indicates that there is abnormal hydrogen loss in the hydrogen storage system that exceeds the allowable range of sealing performance, and the hydrogen leakage fault state of the safety valve is determined to be a static hydrogen leakage fault; if the detected drop in target pressure is not greater than the preset drop threshold, it indicates that the pressure change of the hydrogen storage system is within the normal range caused by factors such as ambient temperature fluctuations, meets the system sealing performance design requirements, and there is no abnormal hydrogen loss, and the safety valve is determined to not have a static hydrogen leakage fault.

[0032] Furthermore, in one embodiment, determining whether the hydrogen leakage fault state of the safety valve is a dynamic hydrogen leakage fault based on the hydrogen supply from the pressure reducing valve and the hydrogen consumption of the fuel-electric system includes: The first hydrogen quantity difference is determined based on the hydrogen supply from the pressure reducing valve and the hydrogen consumption of the gas-fired power system. If the first hydrogen quantity difference is greater than the preset first difference threshold, the hydrogen leakage fault state of the safety valve is determined to be a dynamic hydrogen leakage fault. If the first hydrogen quantity difference is not greater than the preset first difference threshold, it is determined that the safety valve does not have a dynamic hydrogen leakage fault.

[0033] As an example, in this embodiment of the application, the hydrogen supply from the pressure reducing valve and the hydrogen supply from the fuel-electric system are substituted into the following calculation formula to obtain the first hydrogen quantity difference, the calculation formula being:

[0034] In the formula, Hydrogen supply to the pressure reducing valve; Hydrogen consumption for fuel cell power systems; This represents the difference in the first hydrogen quantity.

[0035] Specifically, the specific value of the preset first difference threshold 'a' can be determined according to actual needs and is not limited here. If the first hydrogen quantity difference is greater than the preset first difference threshold, it indicates that after confirming that the pressure reducing valve is in normal working condition and eliminating normal internal losses and other known interference factors allowed by the system design, there is an abnormal hydrogen loss phenomenon in the medium-pressure hydrogen pipeline that exceeds the allowable range of sealing performance. In this case, the hydrogen leakage fault state of the safety valve is determined to be a dynamic hydrogen leakage fault. If the first hydrogen quantity difference is not greater than the preset first difference threshold, it indicates that the difference between the hydrogen supply of the pressure reducing valve and the hydrogen consumption of the gas-fired power system is within a reasonable range under normal system operating conditions, conforms to the principle of mass conservation and system design expectations, and there are no signs of abnormal hydrogen loss. In this case, the safety valve is determined not to have a dynamic hydrogen leakage fault.

[0036] Further, in one embodiment, determining the hydrogen leakage fault state of the fuel cell stack based on the hydrogen consumption of the fuel cell system, the hydrogen consumption of the fuel cell stack, and the hydrogen release from the exhaust valve includes: The second hydrogen quantity difference is determined based on the hydrogen consumption of the gas-fired power system, the hydrogen release from the exhaust valve, and the hydrogen consumption of the fuel cell stack. If the second hydrogen quantity difference is greater than the preset second difference threshold, the hydrogen leakage fault status of the fuel cell stack is determined to be a hydrogen leakage fault. If the second hydrogen quantity difference is not greater than the preset second difference threshold, it is determined that there is no hydrogen leakage fault in the fuel cell stack.

[0037] As an example, in this embodiment of the application, the hydrogen consumption of the fuel cell system, the hydrogen release from the exhaust valve, and the hydrogen consumption of the fuel cell stack are substituted into the following calculation formula to obtain the second hydrogen consumption difference, the calculation formula being:

[0038] In the formula, Hydrogen consumption for fuel cell power systems; The amount of hydrogen released by the exhaust valve; Hydrogen consumption for the fuel cell stack; This is the difference in the amount of hydrogen gas.

[0039] Specifically, the specific value of the preset second difference threshold c can be determined according to actual needs and is not limited here. If the second hydrogen quantity difference is greater than the preset second difference threshold, it means that after confirming that the hydrogen discharge valve is working normally, the stack operating parameters are stable, and the influence of measurement error, calculation error, and normal process emissions of the system has been eliminated, the second hydrogen quantity difference exceeds the normal fluctuation range allowed by the system design. This indicates that there is an abnormal hydrogen loss path that has not been included, which is consistent with the characteristics of hydrogen leakage caused by stack seal failure. Therefore, the hydrogen leakage fault status of the stack is determined to be a hydrogen leakage fault. If the second hydrogen quantity difference is not greater than the preset second difference threshold, it means that the second hydrogen quantity difference is within the reasonable error range caused by measurement accuracy, changes in ambient temperature, and fluctuations in normal system operation. This is consistent with the principle of mass conservation and the expected electrochemical reaction theory, and there are no signs of abnormal hydrogen loss. Therefore, it is determined that there is no hydrogen leakage fault in the stack.

[0040] Furthermore, in one embodiment, before the step of determining the hydrogen leakage fault state of the safety valve based on the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system, the method further includes: The hydrogen supply of the pressure reducing valve is determined based on the preset pressure reducing valve flow coefficient, target pressure, first pressure between the pressure reducing valve and the proportional valve, preset gas specific gravity, preset unit conversion factor, preset gas compressibility factor, and first real-time temperature of the gas at the cylinder valve. The flow coefficient under the preset opening is determined based on the preset opening degree, the preset proportional valve adjustable ratio, and the preset proportional valve fully open flow coefficient. The amount of hydrogen used in the fuel cell system is determined based on the flow coefficient at a preset opening degree, the preset gas specific gravity, the preset unit conversion factor, the preset gas compressibility factor, the first pressure between the pressure reducing valve and the proportional valve, the second pressure between the proportional valve and the fuel cell stack, and the second real-time temperature between the pressure reducing valve and the proportional valve, wherein the first pressure is greater than the second pressure.

[0041] In an exemplary embodiment of this application, the preset pressure reducing valve flow coefficient CV1 characterizes the flow capacity of the pressure reducing valve at a specific opening degree. The target pressure P1, i.e., the high-pressure hydrogen pressure between the cylinder valve and the pressure reducing valve, serves as the high-pressure side pressure source to provide the driving force for gas flow. The first pressure P2 between the pressure reducing valve and the proportional valve serves as the medium-pressure side pressure, which together with P1 forms a pressure difference to drive gas flow. The preset gas specific gravity G is used to correct the influence of gas density on flow rate. The preset unit conversion factor N ensures that the calculation results are converted into practical engineering units (such as standard cubic meters per hour or moles per hour) to meet the needs of fault diagnosis. The preset gas compressibility factor Z is used to correct the characteristics of hydrogen deviating from the ideal gas behavior under high pressure conditions, avoiding flow calculation errors caused by ignoring gas compressibility. The first real-time temperature T1 of the gas at the cylinder valve reflects the actual thermodynamic state of the gas and affects the gas density and flow characteristics. The specific values ​​of the preset pressure reducing valve flow coefficient, preset gas specific gravity, preset unit conversion factor, and preset gas compressibility factor can be determined according to actual needs and are not limited here. For example, the preset gas specific gravity is preferably 0.0696.

[0042] Specifically, with the pressure reducing valve controlled to open, the preset pressure reducing valve flow coefficient, target pressure, first pressure between the pressure reducing valve and the proportional valve, preset gas specific gravity, preset unit conversion factor, preset gas compressibility factor, and first real-time gas temperature at the cylinder valve are substituted into the following calculation formula to obtain the hydrogen supply capacity of the pressure reducing valve. The calculation formula is as follows:

[0043] In the formula, The preset flow coefficient of the pressure reducing valve; For target pressure; The first pressure between the pressure reducing valve and the proportional valve; Preset gas specific gravity; Preset unit conversion factor; The preset gas compressibility coefficient; The first real-time temperature of the gas at the valve; Hydrogen supply to the pressure reducing valve.

[0044] It should be noted that the preset opening degree refers to the percentage value of the proportional valve's opening degree, used to characterize the valve's actual working position; the preset proportional valve adjustable ratio represents the ratio of the valve's maximum controllable flow rate to its minimum controllable flow rate, reflecting the valve's adjustment range and control accuracy; the preset proportional valve fully open flow coefficient is the flow coefficient CV0 in the fully open state of the valve, serving as the valve's inherent maximum flow capacity parameter; the actual flow coefficient CV2 reflects the proportional valve's actual flow capacity under specific operating conditions; the specific values ​​of the preset opening degree, preset proportional valve adjustable ratio, and preset proportional valve fully open flow coefficient can be determined according to actual needs and are not limited here.

[0045] Specifically, when the proportional valve is controlled to be open, the preset opening degree, the preset adjustable ratio of the proportional valve, and the preset fully open flow coefficient of the proportional valve are substituted into the following calculation formula to obtain the flow coefficient at the preset opening degree. The calculation formula is as follows:

[0046] In the formula, Preset opening; The adjustable ratio of the preset proportional valve; The preset proportional valve fully open flow coefficient; This is the flow coefficient under the preset opening degree.

[0047] It should be understood that the flow coefficient CV2 at the preset opening degree characterizes the flow capacity of the proportional valve at a specific opening degree; the preset gas specific gravity reflects the density characteristics of hydrogen relative to the standard gas and is used to correct for the flow differences of different gases under the same conditions; the preset unit conversion factor ensures the consistency of the units of each physical quantity in the calculation process and avoids calculation errors caused by different unit systems; the preset gas compressibility factor considers the non-ideal gas behavior of hydrogen under high pressure conditions and accurately corrects the actual flow rate; the first pressure P2 (i.e., the medium pressure) between the pressure reducing valve and the proportional valve is a key parameter for calculating the inlet pressure of the proportional valve; the second pressure P3 (i.e., the low pressure, the first pressure is greater than the second pressure) between the proportional valve and the fuel cell stack, together with the first pressure, constitutes the pressure difference across the proportional valve, which directly affects the hydrogen flow rate; the second real-time temperature between the pressure reducing valve and the proportional valve reflects the actual operating temperature of hydrogen in this section of the pipeline and is used to correct the influence of temperature on gas density and flow rate; the specific values ​​of the preset gas specific gravity, preset unit conversion factor, and preset gas compressibility factor can be determined according to actual needs and are not limited here.

[0048] Specifically, the amount of hydrogen used in the gas-fired power system is obtained by substituting the flow coefficient at the preset opening degree, the preset gas specific gravity, the preset unit conversion factor, the preset gas compressibility factor, the first pressure between the pressure reducing valve and the proportional valve, the second pressure between the proportional valve and the fuel cell stack, and the second real-time temperature between the pressure reducing valve and the proportional valve into the following calculation formula:

[0049] In the formula, The flow coefficient is the value at the preset opening. Preset gas specific gravity; Preset unit conversion factor; The preset gas compressibility coefficient; The first pressure between the pressure reducing valve and the proportional valve; This is the second pressure between the proportional valve and the fuel cell stack; This is the second real-time temperature between the pressure reducing valve and the proportional valve. This refers to the amount of hydrogen used in the gas-fired power system.

[0050] Furthermore, in one embodiment, before the step of determining the hydrogen leakage fault state of the safety valve based on the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system, the method further includes: The amount of hydrogen used in the fuel cell stack is determined based on the stack's operating current, a preset Faraday constant, and a preset time unit conversion factor. The hydrogen release capacity of the exhaust valve is determined based on the real-time operating temperature of the fuel cell stack, the output voltage of the fuel cell stack, the preset expansion coefficient, the preset hydrogen release valve flow coefficient, the preset gas specific gravity, and the preset valve critical pressure difference ratio coefficient.

[0051] In this exemplary embodiment, the stack operating current characterizes the current output intensity of the fuel cell stack under actual operating conditions; a preset Faraday constant, as a fundamental physical constant in the field of electrochemistry (its value is approximately 96485 coulombs / molar), establishes a quantitative relationship between the current and the molar amount of hydrogen participating in the electrochemical reaction, ensuring accurate conversion from electrical parameters to chemical consumption; a preset time unit conversion factor is used to coordinate the conversion relationship between different time units, so that the calculation results conform to the time scale requirements commonly used in engineering applications; specifically, the stack operating current, the preset Faraday constant, and the preset time unit conversion factor are substituted into the following calculation formula to obtain the amount of hydrogen used in the stack, the calculation formula being:

[0052] In the formula, This refers to the operating current of the fuel cell stack. The Faraday constant is preset. Preset time unit conversion factor; This refers to the amount of hydrogen used in the fuel cell stack.

[0053] It should be noted that the real-time operating temperature of the fuel cell stack reflects the thermodynamic environment parameters of the fuel cell under actual operating conditions, and the output voltage of the fuel cell stack characterizes the intensity of the electrochemical reaction and the system load state. The preset expansion coefficient is a key parameter used to correct for the volume expansion effect caused by pressure reduction when gas passes through valves or throttling devices. The preset hydrogen discharge valve flow coefficient CV3 characterizes the flow capacity of the hydrogen discharge valve under specific conditions, and the preset gas specific gravity is used to correct for the density difference between hydrogen and other standard gases to ensure the accuracy of flow calculation under different gas characteristic conditions. The preset valve critical pressure difference ratio coefficient is used to determine whether the gas reaches the critical flow state when passing through the hydrogen discharge valve. The specific values ​​of the preset expansion coefficient, preset hydrogen discharge valve flow coefficient, preset gas specific gravity, and preset valve critical pressure difference ratio coefficient can be determined according to actual needs and are not limited here. For example, the preset expansion coefficient can preferably be 0.667, and the preset valve critical pressure difference ratio coefficient can preferably be 0.2.

[0054] Specifically, the hydrogen release capacity of the exhaust valve is obtained by substituting the real-time operating temperature of the fuel cell stack, the output voltage of the fuel cell stack, the preset expansion coefficient, the preset hydrogen discharge valve flow coefficient, the preset gas specific gravity, and the preset valve critical pressure difference ratio coefficient into the following calculation formula:

[0055] In the formula, This refers to the real-time operating temperature of the fuel cell stack. This refers to the output voltage of the fuel cell stack. The preset flow coefficient of the hydrogen discharge valve; The preset expansion coefficient; Preset gas specific gravity; This is the preset critical differential pressure ratio coefficient for the valve; This refers to the amount of hydrogen released by the exhaust valve.

[0056] It should be noted that, referring to Figure 3 As shown, after the vehicle is powered on, a static leak detection is first performed: by comparing the high-pressure P1 value at the time of power-on with the high-pressure P1 value recorded before the last power-off, if the drop exceeds a preset threshold, a static leak is determined, and the system reports "Safety valve leakage fault caused by abnormal pressure reducing valve locking pressure"; if the high-pressure drop does not exceed the threshold, the static leak detection is normal, and the system executes the normal startup procedure, opening the cylinder valve and pressure reducing valve; when the fuel cell system enters the working state, the system calculates in real time the hydrogen supply Y1 of the pressure reducing valve, the hydrogen consumption Y2 of the fuel cell system, the hydrogen consumption X1 of the fuel cell stack, and the hydrogen discharge X2 of the hydrogen venting valve. First, the hydrogen supply Y1 of the pressure reducing valve and the hydrogen consumption Y2 of the fuel cell system are compared. If the difference Y1-Y2>a, a dynamic leak is determined in the hydrogen storage system. The system detects hydrogen leakage under static conditions and further confirms whether it is caused by abnormal pressure of the pressure reducing valve. If Y1-Y2≤a, it indicates that the dynamic leakage detection of the hydrogen storage system is normal. The system further compares the hydrogen consumption of the fuel cell system (Y2), the hydrogen consumption of the fuel cell stack (X1), and the hydrogen release from the vent valve (X2). If Y2-X2-X1>c, it is determined that there is an abnormal leakage fault in the fuel cell stack system. If Y2-X2-X1≤c, it indicates that there is no obvious leakage in the hydrogen circuit of the whole vehicle. The system operates normally and records the high pressure P1 value before the current power-off, providing benchmark data for static leakage detection when the next power-on. This diagnostic logic realizes comprehensive leakage monitoring of the whole vehicle hydrogen circuit from static to dynamic and from the hydrogen storage system to the fuel cell stack system, ensuring the systematicness and completeness of hydrogen leakage fault diagnosis.

[0057] Secondly, embodiments of this application also provide a hydrogen leakage fault diagnosis system.

[0058] In one embodiment, the hydrogen leak fault diagnosis system includes: The first processing module is used to determine the hydrogen leakage fault status of the safety valve based on the target pressure between the bottle valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system. The second processing module is used to determine the hydrogen leakage fault status of the fuel cell stack based on the amount of hydrogen used in the fuel cell system, the amount of hydrogen used in the fuel cell stack, and the amount of hydrogen released by the exhaust valve.

[0059] Furthermore, in one embodiment, the first processing module is specifically used for: When the vehicle is stationary for a preset time, the safety valve’s hydrogen leakage fault status is determined based on the target pressure drop and the preset drop threshold. When the gas-fired power system uses hydrogen, the hydrogen leakage fault status of the safety valve is determined based on the hydrogen supply of the pressure reducing valve and the hydrogen consumption of the gas-fired power system.

[0060] Furthermore, in one embodiment, the first processing module is specifically used for: If the detected drop in target pressure is greater than the preset drop threshold, the hydrogen leakage fault status of the safety valve is determined to be a static hydrogen leakage fault. If the detected drop in target pressure is not greater than the preset drop threshold, it is determined that the safety valve does not have a static hydrogen leakage fault.

[0061] Furthermore, in one embodiment, the first processing module is specifically used for: The first hydrogen quantity difference is determined based on the hydrogen supply from the pressure reducing valve and the hydrogen consumption of the gas-fired power system. If the first hydrogen quantity difference is greater than the preset first difference threshold, the hydrogen leakage fault state of the safety valve is determined to be a dynamic hydrogen leakage fault. If the first hydrogen quantity difference is not greater than the preset first difference threshold, it is determined that the safety valve does not have a dynamic hydrogen leakage fault.

[0062] Furthermore, in one embodiment, the second processing module is specifically used for: The second hydrogen quantity difference is determined based on the hydrogen consumption of the gas-fired power system, the hydrogen release from the exhaust valve, and the hydrogen consumption of the fuel cell stack. If the second hydrogen quantity difference is greater than the preset second difference threshold, the hydrogen leakage fault status of the fuel cell stack is determined to be a hydrogen leakage fault. If the second hydrogen quantity difference is not greater than the preset second difference threshold, it is determined that there is no hydrogen leakage fault in the fuel cell stack.

[0063] Furthermore, in one embodiment, the first processing module is specifically used for: The hydrogen supply of the pressure reducing valve is determined based on the preset pressure reducing valve flow coefficient, target pressure, first pressure between the pressure reducing valve and the proportional valve, preset gas specific gravity, preset unit conversion factor, preset gas compressibility factor, and first real-time temperature of the gas at the cylinder valve. The flow coefficient under the preset opening is determined based on the preset opening degree, the preset proportional valve adjustable ratio, and the preset proportional valve fully open flow coefficient. The amount of hydrogen used in the fuel cell system is determined based on the flow coefficient at a preset opening degree, the preset gas specific gravity, the preset unit conversion factor, the preset gas compressibility factor, the first pressure between the pressure reducing valve and the proportional valve, the second pressure between the proportional valve and the fuel cell stack, and the second real-time temperature between the pressure reducing valve and the proportional valve, wherein the first pressure is greater than the second pressure.

[0064] Furthermore, in one embodiment, the first processing module is specifically used for: The amount of hydrogen used in the fuel cell stack is determined based on the stack's operating current, a preset Faraday constant, and a preset time unit conversion factor. The hydrogen release capacity of the exhaust valve is determined based on the real-time operating temperature of the fuel cell stack, the output voltage of the fuel cell stack, the preset expansion coefficient, the preset hydrogen release valve flow coefficient, the preset gas specific gravity, and the preset valve critical pressure difference ratio coefficient.

[0065] This application comprehensively analyzes multi-dimensional data, including the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply from the pressure reducing valve, and the hydrogen consumption of the fuel cell system. By analyzing the hydrogen volume and the pressure difference between the cylinder valve and the pressure reducing valve, it can determine the hydrogen leakage fault status of the safety valve. By analyzing the difference between the hydrogen consumption of the fuel cell system and the hydrogen consumption of the fuel cell stack, combined with the hydrogen release from the exhaust valve, it can accurately determine the hydrogen leakage fault status of the fuel cell stack. This application, by tracking the pressure difference between the cylinder valve and the pressure reducing valve in real time, as well as the hydrogen flow rate at various key nodes (such as the pressure reducing valve, the fuel cell system, and the fuel cell stack), can detect hydrogen leakage at any time. This avoids the shortcomings of traditional methods that cannot detect leaks while the system is running, improving the real-time performance and accuracy of monitoring. Furthermore, it can effectively distinguish between the hydrogen leakage fault status of the safety valve and the fuel cell stack, improving the accuracy of hydrogen leakage diagnosis and providing a clear basis for maintenance and fault location.

[0066] The functions of each module in the above-mentioned hydrogen leak fault diagnosis system correspond to the steps in the above-mentioned hydrogen leak fault diagnosis method embodiment, and their functions and implementation processes will not be described in detail here.

[0067] Thirdly, embodiments of this application provide a hydrogen leak fault diagnosis device, which can be a personal computer (PC), laptop computer, server, or other device with data processing capabilities.

[0068] Reference Figure 4 , Figure 4 This is a schematic diagram of the hardware structure of the hydrogen leak fault diagnosis device involved in the embodiments of this application. In the embodiments of this application, the hydrogen leak fault diagnosis device may include a processor, a memory, a communication interface, and a communication bus.

[0069] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0070] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting internal components of the hydrogen leak fault diagnosis equipment, as well as interfaces used for interconnecting the hydrogen leak fault diagnosis equipment with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0071] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0072] The processor can be a general-purpose processor, which can call the hydrogen leak fault diagnosis program stored in the memory and execute the hydrogen leak fault diagnosis method provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the hydrogen leak fault diagnosis program is called can be referred to in the various embodiments of the hydrogen leak fault diagnosis method of this application, and will not be repeated here.

[0073] Those skilled in the art will understand that Figure 4 The hardware structure shown does not constitute a limitation of this application and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0074] Fourthly, embodiments of this application also provide a readable storage medium.

[0075] The present application has a readable storage medium storing a hydrogen leak fault diagnosis program, wherein when the hydrogen leak fault diagnosis program is executed by a processor, it implements the steps of the hydrogen leak fault diagnosis method as described above.

[0076] The method implemented when the hydrogen leak fault diagnosis procedure is executed can be referred to in various embodiments of the hydrogen leak fault diagnosis method of this application, and will not be repeated here.

[0077] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0078] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0079] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0080] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0081] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0082] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0083] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for diagnosing hydrogen leakage faults, characterized in that, The hydrogen leakage fault diagnosis method includes: The hydrogen leakage fault status of the safety valve is determined based on the target pressure between the bottle valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system. The hydrogen leakage fault status of the fuel cell stack is determined based on the amount of hydrogen used in the fuel cell system, the amount of hydrogen used in the fuel cell stack, and the amount of hydrogen released by the exhaust valve.

2. The hydrogen leak fault diagnosis method as described in claim 1, characterized in that, The determination of the hydrogen leakage fault status of the safety valve based on the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system includes: When the vehicle is stationary for a preset time, the safety valve’s hydrogen leakage fault status is determined based on the target pressure drop and the preset drop threshold. When the gas-fired power system uses hydrogen, the hydrogen leakage fault status of the safety valve is determined based on the hydrogen supply of the pressure reducing valve and the hydrogen consumption of the gas-fired power system.

3. The hydrogen leakage fault diagnosis method as described in claim 2, characterized in that, The method of determining whether the hydrogen leakage fault state of the safety valve is a static hydrogen leakage fault based on the decrease in target pressure and a preset decrease threshold includes: If the detected drop in target pressure is greater than the preset drop threshold, the hydrogen leakage fault status of the safety valve is determined to be a static hydrogen leakage fault. If the detected drop in target pressure is not greater than the preset drop threshold, it is determined that the safety valve does not have a static hydrogen leakage fault.

4. The hydrogen leak fault diagnosis method as described in claim 2, characterized in that, The method of determining whether the hydrogen leakage fault state of the safety valve is a dynamic hydrogen leakage fault based on the hydrogen supply of the pressure reducing valve and the hydrogen consumption of the gas-fired power system includes: The first hydrogen quantity difference is determined based on the hydrogen supply from the pressure reducing valve and the hydrogen consumption of the gas-fired power system. If the first hydrogen quantity difference is greater than the preset first difference threshold, the hydrogen leakage fault state of the safety valve is determined to be a dynamic hydrogen leakage fault. If the first hydrogen quantity difference is not greater than the preset first difference threshold, it is determined that the safety valve does not have a dynamic hydrogen leakage fault.

5. The hydrogen leak fault diagnosis method as described in claim 1, characterized in that, The determination of the hydrogen leakage fault status of the fuel cell stack based on the hydrogen consumption of the fuel cell system, the hydrogen consumption of the fuel cell stack, and the hydrogen release from the exhaust valve includes: The second hydrogen quantity difference is determined based on the hydrogen consumption of the gas-fired power system, the hydrogen release from the exhaust valve, and the hydrogen consumption of the fuel cell stack. If the second hydrogen quantity difference is greater than the preset second difference threshold, the hydrogen leakage fault status of the fuel cell stack is determined to be a hydrogen leakage fault. If the second hydrogen quantity difference is not greater than the preset second difference threshold, it is determined that there is no hydrogen leakage fault in the fuel cell stack.

6. The hydrogen leak fault diagnosis method as described in claim 1, characterized in that, Before the step of determining the hydrogen leakage fault state of the safety valve based on the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system, the following steps are also included: The hydrogen supply of the pressure reducing valve is determined based on the preset pressure reducing valve flow coefficient, target pressure, first pressure between the pressure reducing valve and the proportional valve, preset gas specific gravity, preset unit conversion factor, preset gas compressibility factor, and first real-time temperature of the gas at the cylinder valve. The flow coefficient under the preset opening is determined based on the preset opening degree, the preset proportional valve adjustable ratio, and the preset proportional valve fully open flow coefficient. The amount of hydrogen used in the fuel cell system is determined based on the flow coefficient at a preset opening degree, the preset gas specific gravity, the preset unit conversion factor, the preset gas compressibility factor, the first pressure between the pressure reducing valve and the proportional valve, the second pressure between the proportional valve and the fuel cell stack, and the second real-time temperature between the pressure reducing valve and the proportional valve, wherein the first pressure is greater than the second pressure.

7. The hydrogen leakage fault diagnosis method as described in claim 1, characterized in that, Before the step of determining the hydrogen leakage fault state of the safety valve based on the target pressure between the cylinder valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system, the following steps are also included: The amount of hydrogen used in the fuel cell stack is determined based on the stack's operating current, a preset Faraday constant, and a preset time unit conversion factor. The hydrogen release capacity of the exhaust valve is determined based on the real-time operating temperature of the fuel cell stack, the output voltage of the fuel cell stack, the preset expansion coefficient, the preset hydrogen release valve flow coefficient, the preset gas specific gravity, and the preset valve critical pressure difference ratio coefficient.

8. A hydrogen leak fault diagnosis system, characterized in that, The hydrogen leak fault diagnosis system includes: The first processing module is used to determine the hydrogen leakage fault status of the safety valve based on the target pressure between the bottle valve and the pressure reducing valve, the hydrogen supply of the pressure reducing valve, and the hydrogen consumption of the fuel-electric system. The second processing module is used to determine the hydrogen leakage fault status of the fuel cell stack based on the amount of hydrogen used in the fuel cell system, the amount of hydrogen used in the fuel cell stack, and the amount of hydrogen released by the exhaust valve.

9. A hydrogen leak fault diagnosis device, characterized in that, The hydrogen leak fault diagnosis device includes a processor, a memory, and a hydrogen leak fault diagnosis program stored in the memory and executable by the processor, wherein when the hydrogen leak fault diagnosis program is executed by the processor, it implements the steps of the hydrogen leak fault diagnosis method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a hydrogen leak fault diagnosis program, wherein when the hydrogen leak fault diagnosis program is executed by a processor, it implements the steps of the hydrogen leak fault diagnosis method as described in any one of claims 1 to 7.

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