CN-116344873-B - Method, processor and apparatus for diagnosing hydrogen leakage fault of fuel cell system

Abstract

The embodiment of the invention provides a method, a processor and a device for diagnosing hydrogen leakage faults of a fuel cell system, and belongs to the technical field of fuel cells. The method for diagnosing the hydrogen leakage fault of the fuel cell system comprises the steps of obtaining a first detection value of a first relevant parameter of the fuel cell system under a preset condition, wherein the first relevant parameter comprises hydrogen concentration or hydrogen pressure, determining a primary diagnosis result of the hydrogen leakage fault of the fuel cell system according to the first detection value and a preset threshold value corresponding to the first relevant parameter, performing first processing on the fuel cell system according to the primary diagnosis result to obtain a second detection value of a second relevant parameter of the fuel cell system, wherein the second relevant parameter comprises hydrogen concentration or air pressure, and determining a final diagnosis result of the hydrogen leakage fault of the fuel cell system according to the second detection value. The method of the embodiment of the invention can improve the accuracy of the diagnosis result of the hydrogen leakage fault of the fuel cell system.

Inventors

• YIN LI
• ZHOU ZHIMING
• FU LING
• LIU YANBIN
• FAN ZHAO
• XIANG SHIJIE

Assignees

• 中联重科股份有限公司

Dates

Publication Date

20260505

Application Date

20230324

Claims (20)

1. 1. A method for diagnosing a hydrogen leakage failure of a fuel cell system, the method comprising: acquiring a first detection value of a first related parameter of the fuel cell system under a preset condition, wherein the first related parameter comprises hydrogen concentration or hydrogen pressure; determining a primary diagnosis result of the hydrogen leakage fault of the fuel cell system according to the first detection value and a preset threshold corresponding to the first related parameter; Performing a first process on the fuel cell system according to the primary diagnosis result to obtain a second detection value of a second related parameter of the fuel cell system, wherein the second related parameter comprises hydrogen concentration or air pressure; determining a final diagnosis result of the hydrogen leakage fault of the fuel cell system according to the second detection value; before the first detection value of the first related parameter of the fuel cell system under the preset condition is obtained, the method further includes: acquiring an operating state of the fuel cell system, wherein the operating state comprises in-operation and out-of-operation; and determining the first related parameter and the second related parameter according to the operation state, wherein the first related parameter and the second related parameter are determined to be the hydrogen concentration under the condition that the operation state is in operation, and the first related parameter is determined to be the hydrogen pressure and the second related parameter is determined to be the air pressure under the condition that the operation state is in operation stop.
2. 2. The method of claim 1, wherein the fuel cell system comprises a stack and a housing positioned outside the stack, wherein the housing is provided with a blow inlet and a blow outlet, wherein the blow inlet is connected with an air source through a first proportional solenoid valve, wherein the blow outlet is connected with a hydrogen concentration detection device, wherein the first detection value comprises a first hydrogen concentration value, and wherein the obtaining a first detection value of a first related parameter of the fuel cell system under a preset condition comprises: Controlling the opening of the first proportional electromagnetic valve to be a first preset opening under the condition that the running state is in running; and acquiring a first hydrogen concentration value detected by the hydrogen concentration detection device.
3. 3. The method of claim 2, wherein the predetermined threshold corresponding to the first related parameter comprises a first hydrogen concentration threshold and a second hydrogen concentration threshold, the first hydrogen concentration threshold being less than the second hydrogen concentration threshold, wherein the determining the primary diagnosis of hydrogen leakage of the fuel cell system based on the first detection value and the predetermined threshold corresponding to the first related parameter comprises: Comparing the first hydrogen concentration value with the first hydrogen concentration threshold value and the second hydrogen concentration threshold value; Under the condition that the first hydrogen concentration value is larger than the first hydrogen concentration threshold value and smaller than the second hydrogen concentration threshold value, determining that the primary diagnosis result is early warning of hydrogen leakage of the electric pile; Under the condition that the first hydrogen concentration value is greater than or equal to the second hydrogen concentration threshold value, determining that the primary diagnosis result is a pile hydrogen leakage fault; and under the condition that the first hydrogen concentration value is smaller than or equal to the first hydrogen concentration threshold value, determining that the primary diagnosis result is that the fuel cell system is in normal operation.
4. 4. The method of claim 3, wherein the second sensed value comprises a second hydrogen concentration value, and wherein the performing a first process on the fuel cell system based on the primary diagnostic result to obtain a second sensed value of a second related parameter of the fuel cell system comprises: Under the condition that the primary diagnosis result is early warning of hydrogen leakage of the galvanic pile, the opening of the first proportional electromagnetic valve is adjusted to a second preset opening, wherein the second preset opening is larger than the first preset opening; and obtaining a second hydrogen concentration value detected by the hydrogen concentration detection device.
5. 5. The method of claim 4, wherein said determining a final diagnostic result of the fuel cell system hydrogen leakage fault based on the second detection value comprises: Determining a secondary diagnostic result of the fuel cell system hydrogen leakage fault according to the second hydrogen concentration value and the first hydrogen concentration threshold value; performing a second process on the fuel cell system according to the secondary diagnosis result to obtain a third detection value of the second related parameter; and determining the final diagnosis result according to the third detection value and the first hydrogen concentration threshold value.
6. 6. The method of claim 5, wherein said determining a secondary diagnostic result of a hydrogen leakage fault of said fuel cell system based on said second hydrogen concentration value and said first hydrogen concentration threshold value comprises: Comparing the second hydrogen concentration value with the first hydrogen concentration threshold; Determining that the secondary diagnosis result is a galvanic pile hydrogen leakage fault under the condition that the second hydrogen concentration value is larger than the first hydrogen concentration threshold value; And under the condition that the second hydrogen concentration value is smaller than or equal to the first hydrogen concentration threshold value, determining that the secondary diagnosis result is the fault degree to be confirmed.
7. 7. The method of claim 6, wherein the third sensed value comprises a third hydrogen concentration value, and wherein the performing a second process on the fuel cell system based on the secondary diagnostic result to obtain a third sensed value of the second related parameter comprises: controlling the opening of the first proportional solenoid valve to keep a first preset duration when the secondary diagnosis result is that the fault degree is to be confirmed; Restoring the opening of the first proportional electromagnetic valve to the first preset opening; And obtaining a third hydrogen concentration value detected by the hydrogen concentration detection device.
8. 8. The method of claim 7, wherein determining the final diagnostic result based on the third detection value and the first hydrogen concentration threshold value comprises: under the condition that the third hydrogen concentration value is larger than the first hydrogen concentration threshold value, determining that the final diagnosis result is a slight hydrogen leakage fault of the galvanic pile; and under the condition that the third hydrogen concentration value is smaller than or equal to the first hydrogen concentration threshold value, determining that the final diagnosis result is that the fuel cell system is in normal operation.
9. 9. The method of claim 1, wherein the fuel cell system comprises a stack and a heat dissipation system, the stack comprises an air inlet and an air outlet, a hydrogen inlet and a hydrogen outlet, the air inlet and the air outlet are connected with an air source, the hydrogen inlet and the hydrogen outlet are connected with a hydrogen source, a second proportional solenoid valve is arranged on a connecting channel of the hydrogen inlet and the hydrogen source, a first pressure detection device is arranged on a connecting channel of the hydrogen inlet or the hydrogen outlet and the hydrogen source, the stack is connected with a voltage detection device, and the acquiring a first detection value of a first related parameter of the fuel cell system under preset conditions comprises: Closing the connecting channels of the air inlet and the air outlet and the air source respectively under the condition that the running state is that the running is stopped; Acquiring a voltage value of the electric pile detected by the voltage detection device and determining that the voltage value is zero; adjusting the heat dissipation system so that the temperature of the fuel cell system is a preset temperature; Adjusting the opening of the second proportional electromagnetic valve until the first hydrogen pressure detected by the first pressure detecting device is a preset hydrogen pressure; and after a second preset time interval, acquiring the second hydrogen pressure detected by the first pressure detection device.
10. 10. The method of claim 9, wherein determining the primary diagnostic result of the fuel cell system hydrogen leakage fault based on the first detection value and a preset threshold corresponding to the first correlation parameter comprises: determining a pressure difference between the preset hydrogen pressure and the second hydrogen pressure; comparing the pressure difference value with a first pressure difference threshold value and a second pressure difference threshold value, wherein the first pressure difference threshold value is smaller than the second pressure difference threshold value; Under the condition that the pressure difference value is smaller than or equal to the first pressure difference threshold value, determining that the primary diagnosis result is that the internal air tightness of the fuel cell system and the electric pile is normal; Determining that the primary diagnostic result is a fuel cell system air tightness fault if the pressure difference is greater than the second differential pressure threshold; And under the condition that the pressure difference value is larger than the first pressure difference threshold value and smaller than or equal to the second pressure difference threshold value, determining that the primary diagnosis result is a fault type to be confirmed.
11. 11. The method of claim 10, wherein a second pressure detecting device is disposed on a connection channel between the air outlet or the air inlet and the air source, and wherein the performing a first process on the fuel cell system according to the primary diagnosis result to obtain a second detected value of a second related parameter of the fuel cell system comprises: And under the condition that the primary diagnosis result is that the fault type is to be confirmed, acquiring the variation of the air pressure detected by the second pressure detection device.
12. 12. The method of claim 11, wherein said determining a final diagnostic result of the fuel cell system hydrogen leakage fault based on the second detection value comprises: Determining the internal hydrogen leakage amount of the electric pile according to the variation of the air pressure, the preset temperature and preset parameters; determining an absolute value of a difference between the internal hydrogen leakage amount and a preset hydrogen leakage amount; under the condition that the absolute value is smaller than or equal to a first preset multiple of the preset hydrogen leakage amount, determining that the final diagnosis result is that the hydrogen leakage amount in the electric pile is normal and a pipeline or a valve of the fuel cell system is leaked; and under the condition that the absolute value is larger than the first preset multiple of the preset hydrogen leakage amount, determining that the final diagnosis result is the leakage of the membrane electrode in the electric pile.
13. 13. The method of claim 3, wherein the first hydrogen concentration threshold range comprises 0.9% -1.1% and the second hydrogen concentration threshold range comprises 1.8% -2.2%.
14. 14. The method of claim 12, wherein the first differential pressure threshold is a second preset multiple of the preset differential pressure threshold, the second differential pressure threshold is a third preset multiple of the preset differential pressure threshold, the second preset multiple has a value range of 0.99-1.21, the third preset multiple has a value range of 1.08-1.32, and the first preset multiple has a value range of 0.135-0.165.
15. 15. A method for handling a hydrogen leakage failure of a fuel cell system, the fuel cell system comprising a stack and a housing located outside the stack, the housing having a blow-in inlet and a blow-out outlet, the blow-in inlet being connected to an air source through a first proportional solenoid valve, the blow-out outlet being connected to a hydrogen concentration detection device, comprising: Obtaining a diagnosis result of a hydrogen leakage failure of the fuel cell system in a case where an operation state of the fuel cell system is in operation, wherein the diagnosis result is obtained according to the method for diagnosing a hydrogen leakage failure of a fuel cell system according to any one of claims 1 to 8; determining that the diagnosis result is a pile hydrogen leakage fault; Controlling a hydrogen supply channel and a power supply channel of the fuel cell system to be closed, and adjusting the opening of the first proportional electromagnetic valve until the fourth hydrogen concentration value detected by the hydrogen concentration detection device is smaller than or equal to a preset hydrogen concentration threshold value; and controlling the fuel cell system to be closed.
16. 16. The method of claim 15, wherein the predetermined hydrogen concentration threshold range comprises 0.18% -0.22%.
17. 17. A processor configured to perform the method for fuel cell system hydrogen leakage fault diagnosis according to any one of claims 1 to 14.
18. 18. A processor configured to perform the method for fuel cell system hydrogen leakage failure processing according to claim 15 or 16.
19. 19. An apparatus for diagnosing a hydrogen leakage failure of a fuel cell system, comprising: Parameter detecting apparatus, and The processor of claim 17.
20. 20. An apparatus for handling a hydrogen leakage failure of a fuel cell system, comprising: the processor of claim 18.

Description

Method, processor and apparatus for diagnosing hydrogen leakage fault of fuel cell system Technical Field The present invention relates to the field of fuel cell technologies, and in particular, to a method, a processor, and an apparatus for diagnosing a hydrogen leakage failure of a fuel cell system. Background The fuel cell is a device for converting chemical energy into electric energy, hydrogen generates H+ and electrons under the action of a catalyst, the H+ passes through a proton exchange membrane and reacts with oxygen under the action of the catalyst to produce water molecules, and the electrons form current through an external circuit. Hydrogen has inflammable and explosive characteristics, the explosion range of the hydrogen is 4% -75%, when the concentration of the hydrogen reaches the explosion range, if static electricity, open fire or high temperature occur around the hydrogen, the explosion risk can be possibly caused, so that it is important to detect whether the fuel cell system has hydrogen leakage faults. In the prior art, the hydrogen concentration is detected by a hydrogen concentration sensor, and compared with a preset hydrogen concentration threshold value, and only when the hydrogen concentration is larger than the hydrogen concentration threshold value, the hydrogen leakage fault of the fuel cell system is judged. However, the preset hydrogen concentration threshold is usually a fixed value, and the inside of the fuel cell system is dynamically changed at any time, so that whether the fuel cell system has a hydrogen leakage fault or not is diagnosed only according to the comparison result of the current hydrogen concentration value and the preset hydrogen concentration threshold, and the problem of low accuracy may exist. Disclosure of Invention An object of an embodiment of the present invention is to provide a method and a processor for diagnosing a hydrogen leakage failure of a fuel cell system, a method and a processor for handling a hydrogen leakage failure of a fuel cell system, a device for diagnosing a hydrogen leakage failure of a fuel cell system, a device for handling a hydrogen leakage failure of a fuel cell system, and a fuel cell system, so as to solve the problem that the accuracy may be low in the prior art. To achieve the above object, a first aspect of an embodiment of the present invention provides a method for diagnosing a hydrogen leakage failure of a fuel cell system, the method including: acquiring a first detection value of a first related parameter of the fuel cell system under a preset condition, wherein the first related parameter comprises hydrogen concentration or hydrogen pressure; determining a primary diagnosis result of the hydrogen leakage fault of the fuel cell system according to the first detection value and a preset threshold value corresponding to the first related parameter; Performing a first process on the fuel cell system according to the primary diagnosis result to obtain a second detection value of a second related parameter of the fuel cell system, wherein the second related parameter comprises hydrogen concentration or air pressure; And determining a final diagnosis result of the hydrogen leakage fault of the fuel cell system according to the second detection value. In the embodiment of the invention, before the first detection value of the first related parameter of the fuel cell system under the preset condition is obtained, the method further comprises the steps of obtaining the operation state of the fuel cell system, wherein the operation state comprises the operation in process and the operation stop, and determining the first related parameter and the second related parameter according to the operation state. In the embodiment of the invention, the first related parameter and the second related parameter are determined according to the running state, wherein the first related parameter and the second related parameter are determined to be hydrogen concentration under the condition that the running state is running, and the first related parameter is determined to be hydrogen pressure and the second related parameter is determined to be air pressure under the condition that the running state is stopping running. In the embodiment of the invention, the fuel cell system comprises a galvanic pile and a shell positioned outside the galvanic pile, wherein the shell is provided with an air blowing inlet and an air blowing outlet, the air blowing inlet is connected with an air source through a first proportional electromagnetic valve, the air blowing outlet is connected with a hydrogen concentration detection device, the first detection value comprises a first hydrogen concentration value, the first detection value of a first related parameter of the fuel cell system under the preset condition is obtained, the opening of the first proportional electromagnetic valve is controlled to be a first preset opening under the condition that the