Method and device for detecting hydrogen channeling water fault in operation mode of fuel cell system and vehicle

Abstract

The invention discloses a method and device for detecting a hydrogen channeling fault in an operation mode of a fuel cell system and a vehicle, and the method comprises the steps: under the condition that a diagnosis working condition is satisfied, if Tin is greater than Tmin, Pin is greater than Pmax, and A is greater than Amax, determining that the hydrogen channeling fault occurs. Wherein Tin represents the water inlet temperature, Tmin represents the preset expected temperature lower limit, Pin represents the water inlet pressure, Pmax represents the preset expected pressure upper limit, A represents the opening degree value, A = max (As, Ab), As represents the small proportional valve opening degree, Ab represents the large proportional valve opening degree, max () represents maximum value operation, max (As, Ab) represents the maximum value of As and Ab, and Amax represents the preset expected opening degree upper limit. By adopting the method, whether the hydrogen channeling water fault exists or not can be detected in the running mode of the fuel cell system, and serious problems are avoided.

Description

Technical Field

[0001] This invention belongs to the field of fuel cell systems, and specifically relates to a method, device, and vehicle for detecting hydrogen-water leakage faults in the operation mode of a fuel cell system. Background Technology

[0002] The hydrothermal system (i.e., the thermal management system) and the hydrogen system are two important components of a fuel cell system.

[0003] The main function of the hydrothermal system is to maintain the thermal balance within the fuel cell system, ensuring that the stack can quickly reach a suitable temperature range and remain in optimal operating condition. For example... Figure 1 As shown, the hydrothermal system mainly consists of a high-pressure water pump, inlet water temperature and pressure sensor, filter, intercooler, outlet water temperature and pressure sensor, four-way valve, PTC heater, heater core, three-way valve, deionizer, low-pressure water pump, radiator, and corresponding cooling pipes. The hydrothermal system involves three circulation loops: a small circulation loop, a large circulation loop, and a waste heat recovery loop. These three loops share the fuel cell stack cooling channel, filter, and high-pressure water pump. The intercooler and fuel cell stack are connected in parallel. The parallel section of the small circulation loop is a short pipe for the flow channel, the parallel section of the large circulation loop is the radiator, and the parallel section of the waste heat recovery loop is a branch consisting of the PTC heater, heater core, deionizer, and low-pressure water pump. The coolant flows from the fuel cell stack outlet to the four-way valve, and then flows through a branch of the waste heat recovery circuit before exiting. The coolant that passes through the fuel cell stack merges with the fluid flowing out of the intercooler and then flows out from the other two outlets. One flows through the radiator and then out, and the other flows through a short pipe and then out. The two fluids merge and then flow through the high-pressure water pump. Finally, they pass through a filter to remove large particles of impurities before flowing into the fuel cell stack.

[0004] The primary function of the hydrogen system is to stabilize the hydrogen supply, adjusting the hydrogen pressure via valves to ensure a stable hydrogen pressure at the fuel cell stack inlet. For example... Figure 2As shown, the hydrogen system mainly consists of a hydrogen cylinder, a hydrogen inlet solenoid valve, an ejector with an integrated large proportional valve, an ejector with an integrated small proportional valve, a safety relief valve, a hydrogen pressure sensor, an atmospheric hydrogen leakage sensor, a packaged enclosure hydrogen leakage sensor, a hydrogen-water separator, a vent valve, a drain valve, and other components, as well as corresponding hydrogen pipelines. The hydrogen flow paths involved in the hydrogen system include: an inlet path, a return path, and a vent path. In the inlet path, hydrogen flows from the hydrogen cylinder through the hydrogen inlet solenoid valve, and after passing through either the ejector with the integrated large proportional valve or the ejector with the integrated small proportional valve, the hydrogen pressure is controlled within a suitable range. Finally, after passing through the hydrogen pressure sensor, it flows into the fuel cell stack. In the return path, after the hydrogen flows out of the fuel cell stack, it enters the hydrogen-water separator. In the hydrogen-water separator, the remaining hydrogen is separated from most of the water generated by the chemical reaction and flows back to the front end of either the ejector with the integrated large proportional valve or the ejector with the integrated small proportional valve. Finally, after passing through either the ejector with the integrated large proportional valve or the ejector with the integrated small proportional valve, it flows back into the fuel cell stack. The exhaust path is where hydrogen is consumed in the fuel cell stack reaction. After exiting the stack, it enters the hydrogen-water separator. In the separator, a small amount of residual hydrogen, mixed with nitrogen and saturated water vapor, flows into the atmosphere through the exhaust valve. The water produced in the reaction, mixed with a small amount of residual hydrogen and nitrogen, flows into the atmosphere through the drain valve. The large proportional valve and the small proportional valve are controlled by the controller (FCCU).

[0005] The performance of the hydrothermal system directly affects the energy conversion efficiency and lifespan of a fuel cell. If gas intrusion into the hydrothermal system is not detected in time during fuel cell system operation, it can cause fluctuations or even runaway of parameters such as the temperature and pressure of the coolant inside the stack, affecting fuel cell performance and lifespan, and potentially leading to safety accidents. During fuel cell system operation, the hydrogen pressure is much higher than the air and water pressures; therefore, the most likely gas intrusion hazard is hydrogen-to-water leakage. Currently, hydrogen-to-water leakage detection in fuel cell systems mainly relies on airtightness tests in a static state (i.e., when the fuel cell system is not running). However, hydrogen-to-water leakage can still occur during fuel cell system operation, and its impact is very serious (potentially leading to hydrogen explosion). Therefore, it is essential to design an effective detection method for hydrogen-to-water leakage during fuel cell system operation. Summary of the Invention

[0006] The purpose of this invention is to provide a method, device, and vehicle for detecting hydrogen-water leakage faults in the operation mode of a fuel cell system, so as to detect whether hydrogen-water leakage faults exist in the operation mode and avoid serious problems.

[0007] Due to varying degrees of hydrogen-water leakage, under constant current operation of the fuel cell system, with the PTC heater off, the three-way valve fully closed, the same four-way valve opening, the same high-pressure water pump speed, and the same radiator fan speed, the inlet water temperature, approximate pressure, and proportional valve opening (large or small proportional valve opening) will exhibit completely different characteristics. Therefore, comparing the inlet water temperature, inlet water pressure, and opening values ​​with the desired temperature, desired pressure, and desired opening can help determine whether hydrogen-water leakage has occurred in the fuel cell system during operation.

[0008] In a first aspect, the present invention provides a method for detecting hydrogen-water leakage faults in a fuel cell system operating mode, comprising:

[0009] If T meets the diagnostic conditions, in >T min And P in >P max , and A>A max If T is found to be a hydrogen leakage fault, then a hydrogen leakage fault is determined to have occurred. in Indicates the inlet water temperature, T min P represents the preset lower limit of the desired temperature. in P represents the inlet water pressure. max This represents the preset upper limit of the expected pressure, and A represents the opening value. A = max(A s A b A s A represents the opening degree of a small proportional valve. b This indicates the opening degree of a large proportional valve; max() indicates the operation of taking the maximum value; max(A s A b ) indicates taking A s With A b The maximum value in, A max This indicates the preset upper limit of the expected opening.

[0010] Preferably, when a hydrogen-water leakage fault occurs, if either condition 1a or condition 1b is met, the severity of the hydrogen-water leakage fault is determined to be high; otherwise, the severity of the hydrogen-water leakage fault is determined to be low. Condition 1a is: T in ≥T th And A≥A th Condition 1b is: P in ≥P th And A≥A th ;T th T represents the preset temperature threshold. th >T max T max A represents the preset upper limit of the desired temperature. th A represents the preset opening threshold. th >A max Pth P represents the preset pressure threshold. th >P max .

[0011] Meeting either condition 1a or condition 1b assesses the severity of hydrogen leakage from two independent dimensions (inlet water temperature and inlet water pressure). Whether the leakage is due to abnormally high temperature or abnormally high pressure, either condition combined with abnormally high opening indicates the leakage has progressed to a dangerous level, ensuring comprehensive coverage of various potentially hazardous operating conditions. Based on the detection of hydrogen leakage, further assessment is conducted according to key parameters (T... th P th A th The system determines the severity of the problem and outputs two different levels: "high" or "low". The system can then take drastically different measures based on the severity, making the subsequent processing strategy more accurate and efficient.

[0012] Preferably, if conditions 2a to 2e are met simultaneously, the diagnostic condition is satisfied.

[0013] Condition 2a is: There are no faults in other components of the fuel cell system besides the stack, as well as in the wiring harness and piping.

[0014] Condition 2b is: The fuel cell system has been started and has entered constant current operation mode.

[0015] Condition 2c is: the opening degree of the four-way valve is the opening degree corresponding to the current in the constant current operation mode, the speed of the high-pressure water pump is the water pump speed corresponding to the current in the constant current operation mode, and the speed of the radiator fan is the fan speed corresponding to the current in the constant current operation mode.

[0016] Condition 2d is: PTC heater is off, hydrogen inlet solenoid valve is fully open, and three-way valve is fully closed.

[0017] Condition 2e is: Neither the hydrogen leakage sensor in the enclosure nor the atmospheric hydrogen leakage sensor detected any hydrogen leakage.

[0018] Condition 2a eliminates external interference. Once a problem is detected during subsequent testing, it can be confidently concluded that the issue originates internally within the fuel cell stack, rather than being caused by a damaged sensor, actuator, or circuit. This significantly improves the directionality and accuracy of the testing. Conditions 2b and 2c lock in the steady-state operating condition. The fuel cell system has been started and entered constant current operation mode, meaning the system has moved beyond the dynamically changing start-up / shutdown process and entered a thermodynamically and electrochemically stable state. At this point, parameters such as inlet water temperature and pressure tend to stabilize, facilitating measurement and comparison. All critical actuators (four-way valve, high-pressure water pump, radiator fan) are at values ​​corresponding to the current, thus constituting a repeatable and standardized diagnostic condition. Condition 2d eliminates the influence of the PTC heater (i.e., an additional heat source) on the stack temperature, ensuring that the stack temperature is the true result of the combined effect of its own heat generation and cooling systems. The fully open hydrogen inlet solenoid valve and fully closed three-way valve establish a specific hydrogen circulation or supply mode. This uniform configuration ensures that the fluid path and pressure environment are consistent during each diagnostic, avoiding interference from pressure and flow fluctuations caused by different opening degrees. Condition 2e: Eliminates interference from external hydrogen leakage, avoiding misdiagnosis.

[0019] Preferably, the preset lower limit of the desired temperature T min Preset upper limit of desired temperature T max Preset upper limit of expected pressure P max And the preset expected opening limit A max The following steps were used to test and obtain the results:

[0020] S21. Prepare a fuel cell system that has passed the airtightness test and confirmed that the stack does not have hydrogen-water leakage faults.

[0021] S22. Allow the fuel cell system to operate under diagnostic conditions 2a to 2e.

[0022] S23. Collect the inlet water temperature, inlet water pressure, and the opening degree of the large proportional valve and the small proportional valve of the fuel cell system.

[0023] S24. The minimum value of the collected inlet water temperature of the fuel cell system is taken as the preset lower limit of the desired temperature T. min The maximum value of the inlet water temperature of the fuel cell system is collected as the preset upper limit of the desired temperature T. max The maximum value of the inlet water pressure of the fuel cell system is used as the preset upper limit of the desired pressure P. max , max(A s_max A b_max ) as the preset upper limit of the expected opening A max Among them, A s_max A represents the maximum value of the small proportional valve opening of the fuel cell system collected from the data.b_max This represents the maximum value of the proportional valve opening of the fuel cell system, max(A). s_max A b_max ) indicates taking A s_max With A b_max The maximum value in.

[0024] The tests conducted in steps S21 to S24 obtain the fluctuation ranges of inlet water temperature, inlet water pressure, and the opening degree of the large and small proportional valves under normal, leak-free (hydrogen cross-contamination-free) conditions. The upper limit of the inlet water temperature fluctuation range (i.e., the maximum inlet water temperature) is used as the preset desired upper temperature limit T. max The lower limit of the fluctuation range of the inlet water temperature (i.e., the minimum value of the inlet water temperature) is used as the preset lower limit of the desired temperature T. min The upper limit of the fluctuation range of the inlet water pressure (i.e., the maximum value of the inlet water pressure) is taken as the preset upper limit of the expected pressure P. max The lower limit of the fluctuation range of the inlet water pressure (i.e., the minimum value of the inlet water pressure) is taken as the preset lower limit of the expected pressure, and max(A) is used as the lower limit of the expected pressure. s_max A b_max ) as the preset upper limit of the expected opening A max , change min(A s_min A b_min ) is used as the preset lower limit of the expected opening. Where, A s_max A represents the upper limit of the fluctuation range of the small proportional valve opening of the fuel cell system (i.e., the maximum value of the small proportional valve opening). b_max A represents the upper limit of the fluctuation range of the large proportional valve opening of the fuel cell system (i.e., the maximum value of the large proportional valve opening). s_min A represents the lower limit of the fluctuation range of the small proportional valve opening of the fuel cell system (i.e., the minimum value of the small proportional valve opening). b_min This represents the lower limit of the fluctuation range of the large proportional valve opening of the fuel cell system (i.e., the minimum value of the large proportional valve opening), min(A) s_min A b_min ) indicates taking A s_min With A b_min The minimum value in.

[0025] Under the condition of meeting the diagnostic requirements, the obtained inlet water temperature, inlet water pressure, and large or small proportional valve opening are compared with the preset upper and lower limits of the desired temperature, upper and lower limits of the desired pressure, and upper and lower limits of the desired opening. This allows it to be determined whether a hydrogen-water leakage fault has occurred in the fuel cell system under the operating mode.

[0026] Preferably, if the hydrogen leakage is severe, a red light will illuminate to remind the user to immediately inspect and repair it.

[0027] Preferably, if the severity of the hydrogen leakage is low, a yellow light will illuminate to remind the user to conduct an inspection and repair as soon as possible.

[0028] By using different colored lights, users are alerted to the severity of different hydrogen leakage water faults, which is intuitive and convenient.

[0029] Preferably, the inlet water temperature T in and inlet water pressure P in Data was collected by an inlet water temperature and pressure sensor.

[0030] Preferably, the small proportional valve opening A s The opening degree A of the large proportional valve is obtained by the built-in position sensor of the small proportional valve. b The data is acquired through the built-in position sensor of the large proportional valve.

[0031] Secondly, the present invention provides a detection device for hydrogen-water leakage faults in a fuel cell system operating mode, comprising a controller configured to execute the above-described method for detecting hydrogen-water leakage faults in a fuel cell system operating mode.

[0032] Thirdly, the present invention provides a vehicle that includes a detection device for hydrogen-water leakage faults in the above-mentioned fuel cell system operation mode.

[0033] This invention can diagnose whether a hydrogen-water leakage fault has occurred in a fuel cell system under different operating modes based on the different performance of inlet water temperature, inlet water pressure, and large or small proportional valve opening. It can also diagnose the severity of the hydrogen-water leakage fault, thereby reminding users whether it is necessary to check and repair it immediately, thus avoiding serious problems. Attached Figure Description

[0034] Figure 1 This is a diagram of the hydrothermal system architecture.

[0035] Figure 2 This is a diagram of the hydrogen system architecture.

[0036] Figure 3 This is a flowchart of a method for detecting hydrogen-water leakage faults in a fuel cell system operating mode, as described in an embodiment of the present invention.

[0037] Figure 4 In the embodiments of the present invention, T min T max P max and A max The flowchart for obtaining [the information]. Detailed Implementation

[0038] To gain a more detailed understanding of the features and technical content of the embodiments of the present invention, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of the present invention.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to limit the invention.

[0040] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0041] like Figure 3 As shown in the embodiment of the present invention, the method for detecting hydrogen-water leakage faults in the fuel cell system operation mode includes the following steps:

[0042] S1. Determine whether the diagnostic conditions are met. If yes, execute S2; otherwise, continue executing S1.

[0043] In some embodiments, if conditions 2a to 2e are met simultaneously, it indicates that the diagnostic condition is met.

[0044] Condition 2a is: There are no faults in other components of the fuel cell system besides the stack, as well as in the wiring harness and piping.

[0045] Condition 2b is: The fuel cell system has been started and has entered constant current operation mode.

[0046] Condition 2c is: the opening degree of the four-way valve is the opening degree corresponding to the current in the constant current operation mode, the speed of the high-pressure water pump is the water pump speed corresponding to the current in the constant current operation mode, and the speed of the radiator fan is the fan speed corresponding to the current in the constant current operation mode.

[0047] Condition 2d is: PTC heater is off, hydrogen inlet solenoid valve is fully open, and three-way valve is fully closed.

[0048] Condition 2e is: Neither the hydrogen leakage sensor in the enclosure nor the atmospheric hydrogen leakage sensor detected any hydrogen leakage.

[0049] S2, Determine if T is true. in >T min And P in >P max , and A>A max If yes, then execute S3; otherwise, terminate.

[0050] Among them, Tin Indicates the inlet water temperature, T min P represents the preset lower limit of the desired temperature. in P represents the inlet water pressure. max This represents the preset upper limit of the expected pressure, and A represents the opening value. A = max(A s A b A s A represents the opening degree of a small proportional valve. b This indicates the opening degree of a large proportional valve; max() indicates the operation of taking the maximum value; max(A s A b ) indicates taking A s With A b The maximum value in, A max This indicates the preset upper limit of the expected opening.

[0051] In some embodiments, the inlet water temperature T in and inlet water pressure P in The small proportional valve opening A is obtained through the inlet water temperature and pressure sensor. s The position A of the large proportional valve is obtained through the built-in position sensor of the small proportional valve. b The data is acquired through the built-in position sensor of the large proportional valve.

[0052] like Figure 4 As shown, in some embodiments, the preset desired lower temperature limit T min Preset upper limit of desired temperature T max Preset upper limit of expected pressure P max And the preset expected opening limit A max The following steps were used to test and obtain the results:

[0053] S21. Prepare a fuel cell system that has passed the airtightness test and confirmed that the stack does not have hydrogen-water leakage faults.

[0054] S22. Allow the fuel cell system to operate under diagnostic conditions 2a to 2e.

[0055] S23. Collect the inlet water temperature, inlet water pressure, and the opening degree of the large proportional valve and the small proportional valve of the fuel cell system.

[0056] S24. The minimum value of the collected inlet water temperature of the fuel cell system is taken as the preset lower limit of the desired temperature T. min The maximum value of the inlet water temperature of the fuel cell system is collected as the preset upper limit of the desired temperature T. max The maximum value of the inlet water pressure of the fuel cell system is used as the preset upper limit of the desired pressure P. max , max(A s_max A b_max) as the preset upper limit of the expected opening A max Among them, A s_max A represents the maximum value of the small proportional valve opening of the fuel cell system collected from the data. b_max This represents the maximum value of the proportional valve opening of the fuel cell system, max(A). s_max A b_max ) indicates taking A s_max With A b_max The maximum value in.

[0057] S3. Determine if a hydrogen leakage fault has occurred, then execute S4.

[0058] S4. Determine whether condition 1a or condition 1b is met. If so, execute S5; otherwise, execute S7.

[0059] Among them, condition 1a is: T in ≥T th And A≥A th Condition 1b is: P in ≥P th And A≥A th ;T th T represents the preset temperature threshold. th >T max T max A represents the preset upper limit of the desired temperature. th A represents the preset opening threshold. th >A max P th P represents the preset pressure threshold. th >P max .

[0060] S5. Determine the severity of the hydrogen leakage fault to be high, then proceed to S6.

[0061] S6. The red light illuminates, reminding the user to immediately inspect and repair the device, and then the process ends.

[0062] S7. Determine the severity of the hydrogen leakage fault to be low, then proceed to S8.

[0063] S8, yellow light illuminates, reminding the user to perform inspection and repair as soon as possible, then ends.

[0064] In addition, embodiments of the present invention also provide a detection device for hydrogen-water leakage faults in the operation mode of a fuel cell system, which includes a controller configured to execute the above-described detection method for hydrogen-water leakage faults in the operation mode of a fuel cell system.

[0065] In addition, this invention also provides a vehicle that includes a detection device for hydrogen-water leakage faults in the above-mentioned fuel cell system operation mode.

[0066] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for detecting hydrogen-water leakage faults in a fuel cell system under operating conditions, characterized in that, include: If T meets the diagnostic conditions, in >T min And P in >P max , and A>A max If T is found to be a hydrogen leakage fault, then a hydrogen leakage fault is determined to have occurred. in Indicates the inlet water temperature, T min P represents the preset lower limit of the desired temperature. in P represents the inlet water pressure. max This represents the preset upper limit of the expected pressure, and A represents the opening value. A = max(A s A b A s A represents the opening degree of a small proportional valve. b This indicates the opening degree of a large proportional valve; max() represents the operation of taking the maximum value; A max This indicates the preset upper limit of the expected opening.

2. The method for detecting hydrogen-water leakage faults in the operating mode of a fuel cell system according to claim 1, characterized in that, When a hydrogen-water leakage fault occurs, if either condition 1a or condition 1b is met, the severity of the hydrogen-water leakage fault is determined to be high; otherwise, the severity of the hydrogen-water leakage fault is determined to be low. Condition 1a is: T in ≥T th And A≥A th Condition 1b is: P in ≥P th And A≥A th ;T th T represents the preset temperature threshold. th >T max T max A represents the preset upper limit of the desired temperature. th A represents the preset opening threshold. th >A max P th P represents the preset pressure threshold. th >P max .

3. The method for detecting hydrogen-water leakage faults in the operating mode of a fuel cell system according to claim 2, characterized in that: If conditions 2a to 2e are met simultaneously, then the diagnostic condition is satisfied; where, Condition 2a is: There are no faults in other components of the fuel cell system except the stack, as well as in the wiring harness and piping. Condition 2b is: The fuel cell system has been started and has entered constant current operation mode; Condition 2c is: the opening degree of the four-way valve is the opening degree corresponding to the current in the constant current operation mode, the speed of the high-pressure water pump is the water pump speed corresponding to the current in the constant current operation mode, and the speed of the radiator fan is the fan speed corresponding to the current in the constant current operation mode. Condition 2d is: PTC heater is off, hydrogen inlet solenoid valve is fully open, and three-way valve is fully closed; Condition 2e is: Neither the hydrogen leakage sensor in the enclosure nor the atmospheric hydrogen leakage sensor detected any hydrogen leakage.

4. The method for detecting hydrogen-water leakage faults in the operating mode of a fuel cell system according to claim 3, characterized in that, The preset desired lower temperature limit T min Preset upper limit of desired temperature T max Preset upper limit of expected pressure P max And the preset expected opening limit A max The following steps were used to test and obtain the results: S21. Prepare a fuel cell system whose stack has been confirmed to be free of hydrogen-water leakage faults through airtightness testing. S22. Allow the fuel cell system to operate under diagnostic conditions that meet conditions 2a to 2e; S23. Collect the inlet water temperature, inlet water pressure, and the opening degree of the large proportional valve and the small proportional valve of the fuel cell system. S24. The minimum value of the collected inlet water temperature of the fuel cell system is taken as the preset lower limit of the desired temperature T. min The maximum value of the inlet water temperature of the fuel cell system is collected as the preset upper limit of the desired temperature T. max The maximum value of the inlet water pressure of the fuel cell system is used as the preset upper limit of the desired pressure P. max , max(A s_max A b_max ) as the preset upper limit of the expected opening A max ; Among them, A s_max A represents the maximum value of the small proportional valve opening of the fuel cell system collected from the data. b_max This represents the maximum value of the proportional valve opening of the fuel cell system collected.

5. The method for detecting hydrogen-water leakage faults in the operating mode of a fuel cell system according to any one of claims 2 to 4, characterized in that: If the hydrogen leakage is severe, a red light will illuminate, reminding the user to immediately inspect and repair it.

6. The method for detecting hydrogen-water leakage faults in the operating mode of a fuel cell system according to claim 5, characterized in that: If the hydrogen leakage is of minor severity, a yellow light will illuminate, reminding the user to have it checked and repaired as soon as possible.

7. The method for detecting hydrogen-water leakage faults in the operating mode of a fuel cell system according to claim 6, characterized in that: The inlet water temperature T in and inlet water pressure P in Data was collected by an inlet water temperature and pressure sensor.

8. The method for detecting hydrogen-water leakage faults in the operating mode of a fuel cell system according to claim 6, characterized in that: The small proportional valve opening A s The opening degree A of the large proportional valve is obtained by the built-in position sensor of the small proportional valve. b The data is acquired through the built-in position sensor of the large proportional valve.

9. A detection device for hydrogen-water leakage faults in a fuel cell system operating mode, comprising a controller, characterized in that: The controller is configured to perform the method for detecting hydrogen-water leakage faults in the operating mode of a fuel cell system as described in any one of claims 1 to 8.

10. A vehicle, characterized in that: Includes the detection device for hydrogen-water leakage faults in the operating mode of a fuel cell system as described in claim 9.

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