Hydrogen injection valve fault diagnosis method and device, vehicle, storage medium and program product

Abstract

The invention relates to the technical field of fault diagnosis, in particular to a hydrogen injection valve fault diagnosis method and device, a vehicle, a storage medium and a program product, and the method comprises the steps: obtaining a fault diagnosis type of a hydrogen injection valve; determining a target driving signal of the hydrogen injection valve according to the fault diagnosis type; and diagnosing the fault of the hydrogen injection valve according to the operation parameters of the hydrogen injection valve under the target driving signal. Therefore, the problems that in the prior art, only signals of the hydrogen pressure sensor can be diagnosed, different fault types of the hydrogen injection valve cannot be diagnosed, and fault sources cannot be positioned are solved.

Description

Technical Field

[0001] The present application relates to the technical field of fault diagnosis, and in particular to a method, device, vehicle, storage medium and program product for diagnosing a hydrogen injection valve fault. Background Art

[0002] For a fuel cell engine, the fuel cell engine can only operate efficiently when the hydrogen injection valve injects normally until the target hydrogen pressure is reached.

[0003] Generally, the FCCU (Fuel Cell Control Unit) software determines the amount of hydrogen required by the fuel cell engine based on various conditions. The amount of hydrogen is indexed by the hydrogen pressure value. After calculation, the FCCU software sends a duty cycle instruction of the PWM (Pulse Width Modulation) signal to open the hydrogen injection valve to a certain opening, that is, the sealing armature moves to a certain position to adjust the amount of hydrogen injected by the hydrogen injection valve. However, since there is no armature position signal feedback in the hydrogen injection valve, the FCCU software can only determine whether the corresponding duty cycle instruction has been issued to the hydrogen injection valve, but cannot determine whether the hydrogen injection valve has actually reached the corresponding opening. If the hydrogen injection valve does not actually reach the target opening due to some faults, such as circuit abnormalities, wiring harness damage, foreign matter jamming, etc., the FCCU software will not be able to know.

[0004] There are some diagnostic algorithms in the existing FCCU software. However, for the hydrogen path of the fuel cell engine, only the diagnostic algorithm is designed for the signal of the hydrogen pressure sensor, which can diagnose whether the actual hydrogen pressure measured exceeds the normal range and whether it is consistent with the target hydrogen pressure in the algorithm. Other types of fault diagnosis are not considered, and the source of the fault cannot be located. Summary of the invention

[0005] The present application provides a hydrogen injection valve fault diagnosis method, device, vehicle, storage medium and program product to solve technical problems in the related art that only the signal of the hydrogen pressure sensor can be diagnosed, but different fault types of the hydrogen injection valve cannot be diagnosed and the source of the fault cannot be located.

[0006] A first aspect of the present application provides a hydrogen injection valve fault diagnosis method, comprising the following steps: obtaining a fault diagnosis type of the hydrogen injection valve; determining a target drive signal of the hydrogen injection valve according to the fault diagnosis type; and diagnosing the fault of the hydrogen injection valve according to operating parameters of the hydrogen injection valve under the target drive signal.

[0007] Optionally, the fault diagnosis type includes first to sixth diagnosis types, wherein the first diagnosis type is hydrogen injection valve drive current diagnosis, the second diagnosis type is hydrogen injection valve normally open diagnosis, the third diagnosis type is hydrogen injection valve normally closed diagnosis, the fourth diagnosis type is hydrogen injection valve hydrogen pipeline leakage diagnosis, the fifth diagnosis type is hydrogen injection valve opening stuck diagnosis, and the sixth diagnosis type is hydrogen injection valve return stuck diagnosis.

[0008] Optionally, the target drive signal is a duty cycle of PWM, and different fault diagnosis types correspond to different target drive signals.

[0009] Optionally, if the fault diagnosis type is the fifth diagnosis type, then before determining the target drive signal of the hydrogen injection valve according to the fault diagnosis type, it also includes: obtaining the target pressure of the hydrogen pipeline of the hydrogen injection valve; calculating the pressure difference between the actual pressure and the target pressure; if the pressure difference is greater than the target difference, determining the target drive signal of the hydrogen injection valve according to the fifth diagnosis type.

[0010] Optionally, diagnosing a fault of the hydrogen injection valve according to operating parameters of the hydrogen injection valve under a target drive signal includes: acquiring reference parameters of the hydrogen injection valve under the target drive signal; and diagnosing the fault of the hydrogen injection valve according to the reference parameters and the operating parameters.

[0011] Optionally, before diagnosing a fault of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target drive signal, the method includes: if the fault diagnosis type is the second to sixth diagnosis type, obtaining the pressure of the hydrogen pipeline of the hydrogen injection valve under the target drive signal; and diagnosing the fault of the hydrogen injection valve based on the pressure.

[0012] A second aspect of the present application provides a hydrogen injection valve fault diagnosis device, including: an acquisition module, used to obtain the fault diagnosis type of the hydrogen injection valve; a determination module, used to determine the target drive signal of the hydrogen injection valve according to the fault diagnosis type; and a diagnosis module, used to diagnose the fault of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target drive signal.

[0013] Optionally, the fault diagnosis type includes first to sixth diagnosis types, wherein the first diagnosis type is hydrogen injection valve drive current diagnosis, the second diagnosis type is hydrogen injection valve normally open diagnosis, the third diagnosis type is hydrogen injection valve normally closed diagnosis, the fourth diagnosis type is hydrogen injection valve hydrogen pipeline leakage diagnosis, the fifth diagnosis type is hydrogen injection valve opening stuck diagnosis, and the sixth diagnosis type is hydrogen injection valve return stuck diagnosis.

[0014] Optionally, the target drive signal is a duty cycle of PWM, and different fault diagnosis types correspond to different target drive signals.

[0015] Optionally, if the fault diagnosis type is the fifth diagnostic type, it also includes: a calculation module, used to obtain the target pressure of the hydrogen pipeline of the hydrogen injection valve before determining the target drive signal of the hydrogen injection valve according to the fault diagnosis type; calculate the pressure difference between the actual pressure and the target pressure; if the pressure difference is greater than the target difference, determine the target drive signal of the hydrogen injection valve according to the fifth diagnostic type.

[0016] Optionally, the diagnosis module is further used to: obtain reference parameters of the hydrogen injection valve under the target driving signal; and diagnose a fault of the hydrogen injection valve according to the reference parameters and the operating parameters.

[0017] Optionally, it also includes: a first diagnostic module, which is used to obtain the pressure of the hydrogen pipeline of the hydrogen injection valve under the target drive signal before diagnosing the fault of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target drive signal if the diagnosis type is the second to sixth diagnosis type; and diagnose the fault of the hydrogen injection valve based on the pressure.

[0018] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to perform a hydrogen injection valve fault diagnosis method as described in the above embodiment.

[0019] A fourth aspect of the present application provides a computer-readable storage medium on which a computer program or instruction is stored. The computer program or instruction is executed by a processor to perform the hydrogen injection valve fault diagnosis method as described in the above embodiment.

[0020] A fourth aspect of the present application provides a computer program product, including a computer program or instructions. When the computer program or instructions are executed, the hydrogen injection valve fault diagnosis method as described in the above embodiment is implemented.

[0021] Therefore, this application has at least the following beneficial effects:

[0022] The embodiment of the present application can determine the target drive signal according to the fault diagnosis type, and drive the hydrogen injection valve according to the target drive signal, and then diagnose the fault of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target drive signal, so as to realize the fault diagnosis of different types of hydrogen injection valves, so as to facilitate the subsequent rapid location of the root cause of the fault when a hydrogen injection valve-related fault occurs, and avoid the problem that the fuel cell engine continues to work when the hydrogen injection valve fails, which may eventually cause damage to the fuel cell engine stack, thereby improving the efficiency of fault detection and resolution. Therefore, the technical problems that the related technology can only realize the diagnosis of the signal of the hydrogen pressure sensor, cannot realize the diagnosis of different fault types of the hydrogen injection valve, and cannot locate the source of the fault are solved.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 A schematic diagram of a hydrogen path of a fuel cell engine in the related art;

[0026] Figure 2 A schematic diagram of a flow characteristic curve of a hydrogen injection valve in the related art;

[0027] Figure 3 A schematic diagram of a hydrogen injection valve driving circuit of the related art;

[0028] Figure 4 A diagram showing a relationship curve between a duty cycle and an output drive current in the related art;

[0029] Figure 5 A flowchart of a hydrogen injection valve fault diagnosis method provided according to an embodiment of the present application;

[0030] Figure 6 A schematic diagram of a hydrogen path of a fuel cell engine with an additional stack inlet valve and a buffer tank provided according to an embodiment of the present application;

[0031] Figure 7 A schematic diagram of a hydrogen injection valve driving circuit with a current feedback circuit added according to an embodiment of the present application;

[0032] Figure 8 A specific flow chart of a hydrogen injection valve fault diagnosis method provided according to an embodiment of the present application;

[0033] Fig. 9 A flowchart of hydrogen injection valve drive current diagnosis according to an embodiment of the present application;

[0034] Fig.10 A flow chart of a normally open hydrogen injection valve diagnosis according to an embodiment of the present application;

[0035] Fig.11 A flowchart of a normally closed diagnosis of a hydrogen injection valve provided according to an embodiment of the present application;

[0036] Fig.12 A flowchart of hydrogen pipeline leakage diagnosis provided according to an embodiment of the present application;

[0037] Fig.13 A flowchart of the hydrogen injection valve opening and blocking diagnosis provided according to an embodiment of the present application;

[0038] Fig.14 A flowchart of a hydrogen injection valve return jam diagnosis according to an embodiment of the present application;

[0039] Fig.15 This is an example diagram of a hydrogen injection valve fault diagnosis device provided according to an embodiment of the present application;

[0040] Fig.16 It is a schematic diagram of the structure of a vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0042] Before describing the solution of the present application, some equipment or devices involved in the solution of the present application are first introduced, such as the hydrogen circuit of the fuel cell engine, the hydrogen injection valve, the hydrogen injection valve drive circuit, etc.

[0043] Among them, the hydrogen path of the fuel cell engine is as follows Figure 1 As shown, the hydrogen supply comes from the outside, the switch valve controls the on and off of the hydrogen supply, the hydrogen injected by the hydrogen injection valve enters the fuel cell stack for reaction, and the hydrogen pressure sensor measures the pressure of the hydrogen entering the stack. After consumption by the fuel cell stack, the mixed gas is discharged from the fuel cell stack. After passing through the anode separator, the recyclable hydrogen passes through the hydrogen circulation pump and continues to enter the fuel cell stack for reaction. The check valve can prevent this part of the hydrogen from flowing back. Non-recyclable gases and liquids are discharged from the fuel cell engine through the exhaust valve and the water distribution valve. When the pressure of the hydrogen entering the stack exceeds the safety pressure, the safety valve will open and part of the hydrogen entering the stack will be directly discharged. After the hydrogen pressure is less than the safety pressure, the safety valve will close again.

[0044] The hydrogen injection valve is a proportional valve that converts the input PWM duty cycle signal into a corresponding opening, thereby continuously controlling the flow rate. The hydrogen injection valve is driven by the low-side PWM signal output by the FCCU. The duty cycle of the PWM signal refers to the proportion of time that the high level accounts for in the signal cycle. The duty cycle determines the driving voltage of the hydrogen injection valve, and the driving voltage provides the driving current. After the driving current passes through the coil inside the hydrogen injection valve, an electromagnetic force is generated, causing the sealing armature inside the hydrogen injection valve to displace. The displacement of the armature is called the opening of the hydrogen injection valve. The opening of the hydrogen injection valve determines the flow rate of the hydrogen injection valve. The corresponding relationship between the duty cycle and flow rate of the hydrogen injection valve is called the flow characteristic of the hydrogen injection valve. The flow characteristic curve of the hydrogen injection valve is shown as follows: Figure 2 shown.

[0045] The hydrogen injection valve uses low-side PWM drive for open-loop control. The open-loop control hydrogen injection valve drive circuit is as follows Figure 3 As shown. After the FCCU software performs relevant calculations, the main control chip of the FCCU sends out a PWM control signal without load. After the PWM control signal passes through the low-side driver chip, it becomes a low-side PWM drive signal that can be loaded. When the temperature is 23℃ and the power supply voltage is 12V, the corresponding relationship between the duty cycle of the PWM drive signal and the output drive current is as follows: Figure 4 shown.

[0046] The fuel cell stack is the energy conversion module of the fuel cell engine. The fuel cell stack consumes air and hydrogen to generate electricity. The hydrogen flow rate directly affects the performance of the fuel cell stack. However, considering that the cost of pressure sensors is lower than that of flow sensors, hydrogen pressure is usually used instead of hydrogen flow rate as the key control variable. As shown in the figure, a hydrogen pressure sensor is arranged at the entrance of the fuel cell stack to measure the hydrogen pressure after the hydrogen injection valve and before entering the fuel cell stack. When the hydrogen injection valve injects hydrogen, the hydrogen pressure in the pipeline rises, and when the fuel cell stack consumes hydrogen, the hydrogen pressure drops. When the fuel cell stack works under different working conditions, the required hydrogen pressure is different. Setting the target hydrogen pressure value in the FCCU software can realize the feedback adjustment of the hydrogen injection flow rate by the FCCU software, so that the actual hydrogen pressure and the target hydrogen pressure tend to be consistent. In the current FCCU software, the deviation between the actual hydrogen pressure after adjustment and the target hydrogen pressure is not allowed to exceed 15kPa.

[0047] However, the existing control method for hydrogen injection valve has the following problems:

[0048] (1) The hydrogen injection valve uses a low-side PWM drive for open-loop control, which can only detect the PWM control signal, but cannot detect the actual low-side PWM drive signal of the FCCU. That is, the FCCU software can only confirm that a command has been issued, but does not know how it is actually executed.

[0049] (2) In the existing FCCU software, only the diagnostic algorithm is designed for the signal of the hydrogen pressure sensor, which can diagnose whether the actual hydrogen pressure measured exceeds the normal range and whether it is consistent with the target hydrogen pressure in the algorithm. However, there is no diagnostic algorithm for the hydrogen injection valve drive, hydrogen pipeline leakage, etc. When the actual hydrogen pressure is abnormal, the fault location cannot be quickly identified, which reduces the efficiency of fault handling.

[0050] (3) There is no position sensor at the armature inside the hydrogen injection valve, so it is impossible to determine the actual opening of the hydrogen injection valve, and thus it is impossible to directly determine whether the hydrogen injection valve has a driving failure. If the hydrogen injection valve has a driving failure, its opening cannot be adjusted, and the amount of hydrogen injection is no longer controlled by the FCCU software. The fuel cell stack cannot obtain the appropriate amount of hydrogen and cannot operate efficiently. After a long accumulation time, it may even cause damage to the fuel cell stack.

[0051] To this end, the present application proposes a hydrogen injection valve fault diagnosis method, which can determine a target drive signal according to the fault diagnosis type, and drive the hydrogen injection valve according to the target drive signal, and then diagnose the hydrogen injection valve fault according to the operating parameters of the hydrogen injection valve under the target drive signal, so as to realize different types of hydrogen injection valve fault diagnosis.

[0052] Specifically, Figure 5 A schematic flow chart of a hydrogen injection valve fault diagnosis method provided in an embodiment of the present application.

[0053] like Figure 5 As shown, the hydrogen injection valve fault diagnosis method includes the following steps:

[0054] In step S101 , the fault diagnosis type of the hydrogen injection valve is obtained.

[0055] Among them, the fault diagnosis types include the first to sixth diagnosis types, among which the first diagnosis type is the hydrogen injection valve driving current diagnosis, the second diagnosis type is the hydrogen injection valve normally open diagnosis, the third diagnosis type is the hydrogen injection valve normally closed diagnosis, the fourth diagnosis type is the hydrogen injection valve hydrogen pipeline leakage diagnosis, the fifth diagnosis type is the hydrogen injection valve opening stuck diagnosis, and the sixth diagnosis type is the hydrogen injection valve return stuck diagnosis.

[0056] It can be understood that the embodiments of the present application can diagnose a variety of hydrogen injection valve types, which are not limited to the prior art method of diagnosing the signal of the hydrogen pressure sensor, and can perform hydrogen injection valve drive current diagnosis, hydrogen injection valve normally open diagnosis, hydrogen injection valve normally closed diagnosis, pipeline leakage diagnosis, hydrogen injection valve opening stuck diagnosis, and hydrogen injection valve return stuck diagnosis.

[0057] In step S102 , a target driving signal of the hydrogen injection valve is determined according to the fault diagnosis type.

[0058] The target drive signal is the duty cycle of PWM. Different fault diagnosis types correspond to different target drive signals, and the target drive signal is set according to actual conditions.

[0059] It should be noted that the PWM signal includes frequency and duty cycle. The diagnosis in the embodiment of the present application is mainly based on the duty cycle of the PWM signal. However, to output a PWM signal, its frequency must be set, and the frequency can be set according to the specific situation.

[0060] For example, the fault diagnosis type is the first diagnostic type, the target drive signal is 1kHz frequency and 10% duty cycle; the fault diagnosis type is the second diagnostic type, the target drive signal is 0% duty cycle; the fault diagnosis type is the third diagnostic type, the target drive signal is 1kHz frequency and 40% duty cycle; the fault diagnosis type is the fourth diagnostic type, the target drive signal is 1kHz frequency and 50% duty cycle; the fault diagnosis type is the fifth diagnostic type, the target drive signal is 1kHz frequency and 100% duty cycle; the fault diagnosis type is the sixth diagnostic type, the target drive signal is 100% duty cycle.

[0061] It is understandable that the embodiment of the present application can determine the target driving signal of the hydrogen injection valve according to the fault diagnosis type, so as to diagnose different fault types later.

[0062] In an embodiment of the present application, if the fault diagnosis type is the fifth diagnosis type, then before determining the target drive signal of the hydrogen injection valve according to the fault diagnosis type, it also includes: obtaining the target pressure of the hydrogen pipeline of the hydrogen injection valve; calculating the pressure difference between the actual pressure and the target pressure; if the pressure difference is greater than the target difference, determining the target drive signal of the hydrogen injection valve according to the fifth diagnosis type.

[0063] Among them, the target pressure and the target difference can be set according to the specific situation, and there is no specific limitation on this.

[0064] It is understandable that in the embodiment of the present application, when the pressure difference between the actual pressure of the hydrogen pipeline and the target pressure is greater than the target difference, the target drive signal of the hydrogen injection valve can be determined according to the fifth diagnostic type to perform fault diagnosis of the fifth diagnostic type.

[0065] For example, the target difference is set to 15kPa, and the current pressure difference is 14kPa, which is less than 15kPa, indicating that the fuel cell engine is working normally at this time, and there is no need to perform the fifth diagnostic type of fault diagnosis. If the current pressure difference is 16kPa, which is greater than 15kPa, the target drive signal of the hydrogen injection valve is determined according to the fifth diagnostic type, and the fifth diagnostic type of fault diagnosis is performed.

[0066] In step S103, a fault of the hydrogen injection valve is diagnosed according to the operating parameters of the hydrogen injection valve under the target driving signal.

[0067] The operating parameter may be a driving current fed back by the hydrogen injection valve.

[0068] It can be understood that the embodiments of the present application can diagnose the failure of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target drive signal to realize the fault diagnosis of different types of hydrogen injection valves, so as to facilitate the rapid location of the root cause of the failure when a hydrogen injection valve-related failure occurs in the future, and avoid the problem that the fuel cell engine continues to work when the hydrogen injection valve fails, which may eventually cause damage to the fuel cell engine stack, thereby improving the efficiency of troubleshooting and resolution.

[0069] In an embodiment of the present application, diagnosing a fault of the hydrogen injection valve according to operating parameters of the hydrogen injection valve under a target drive signal includes: acquiring reference parameters of the hydrogen injection valve under the target drive signal; and diagnosing the fault of the hydrogen injection valve according to the reference parameters and the operating parameters.

[0070] The reference parameter may be a calibrated current curve.

[0071] It can be understood that the embodiment of the present application can obtain reference parameters of the hydrogen injection valve under the target drive signal, and diagnose the fault of the hydrogen injection valve based on the reference parameters and the operating parameters, that is, whether the driving current of the hydrogen injection valve under the target drive signal meets the calibrated current curve. If it meets the calibrated current curve, it means that the hydrogen injection valve does not have a fault of the first diagnostic type and there is no driving current abnormality.

[0072] In the embodiment of the present application, before diagnosing the fault of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target drive signal, it also includes: if the fault diagnosis type is the second to sixth diagnosis type, obtaining the pressure of the hydrogen pipeline of the hydrogen injection valve under the target drive signal; diagnosing the fault of the hydrogen injection valve based on the pressure.

[0073] It can be understood that, in the embodiment of the present application, when the fault diagnosis type is the second to sixth diagnosis types, the fault of the hydrogen injection valve is diagnosed according to the pressure of the hydrogen pipeline of the hydrogen injection valve under the target driving signal of the hydrogen injection valve.

[0074] For example, the current diagnosis type is the second diagnosis type, which is the hydrogen injection valve normally open diagnosis. If the current hydrogen pressure increase value is greater than 1 kPa, it means that the hydrogen injection valve is spraying hydrogen and is in the open state, and the diagnosis result is: the hydrogen injection valve is normally open.

[0075] It should be noted that before the hydrogen injection valve fault diagnosis method of the present application is implemented, a stack inlet valve and a buffer tank are added to the hydrogen path of the existing fuel cell engine, such as Figure 6 As shown, in the hydrogen circuit, all electrical controls are controlled by the FCCU, and in order to confirm the actual output effect of the FCCU, as shown in Figure 7 As shown, a current feedback circuit is added to the hydrogen injection valve drive circuit.

[0076] in, Figure 6The main valve and stack entry valve are electronically controlled and controlled by the FCCU. The safety valve and check valve are mechanical parts. The safety pressure threshold of the safety valve is 350kPa. When the pressure in the hydrogen pipeline is higher than the threshold, the safety valve automatically opens and releases the pressure. The check valve is a one-way valve that prevents the gas in the hydrogen pipeline from flowing back to the hydrogen circulation pump. The maximum reverse pressure is 400kPa. After closing the main valve and stack entry valve, the hydrogen pipeline where the hydrogen pressure sensor and hydrogen injection valve are located should become a sealed system. When a pressure of 50kPa is passed, the pressure drop within 20 minutes is ≤30kPa.

[0077] In the hydrogen injection valve fault diagnosis process, when the fault diagnosis is type 5, it is necessary to confirm the allowable difference between the actual hydrogen pressure and the target hydrogen pressure. The allowable deviation in the FCCU software is 15kPa. Therefore, 15kPa is used as the allowable difference between the two. The difference between the two is calculated every 20ms. If the difference is ≤15kPa, the fuel cell engine continues to work normally until it stops normally. If the difference is >15kPa, it means that either the FCCU software is wrong or there is a problem with a part in the hydrogen pipeline, and the fault needs to be checked.

[0078] Specifically, the specific process of the hydrogen injection valve fault diagnosis method of the embodiment of the present application is as follows: Figure 8 As shown, the following steps are included:

[0079] (1) Activate the FCCU to make it work normally.

[0080] (2) The FCCU sends a command to stop the hydrogen circulation pump. At this time, no hydrogen will flow through the check valve.

[0081] (3) Perform diagnosis 1: Check the driving current of the hydrogen injection valve. During this process, it can be diagnosed whether the driving current is normal.

[0082] (4a) If the drive current is normal, perform the second diagnosis: hydrogen injection valve normally open diagnosis. In this process, it is possible to diagnose whether the hydrogen injection valve is normally open.

[0083] (4b) If the driving current is abnormal, a fault is reported: hydrogen injection valve driving fault.

[0084] (5a) If the hydrogen injection valve is not normally open, perform diagnosis three: hydrogen injection valve normally closed diagnosis. In this process, it is possible to diagnose whether the hydrogen injection valve is normally closed.

[0085] (5b) If the hydrogen injection valve is normally open, a fault will be reported: hydrogen injection valve normally open fault.

[0086] (6a) If the hydrogen injection valve is not always closed, perform Diagnosis 4: Pipeline Leakage Diagnosis. In this process, it is possible to diagnose whether the pipeline is leaking.

[0087] (6b) If the hydrogen injection valve is normally closed, a fault is reported: hydrogen injection valve normally closed fault.

[0088] (7a) If there is no leakage in the pipeline, the fuel cell engine enters normal working state.

[0089] (7b) If the pipeline leaks, a fault will be reported: pipeline leakage fault.

[0090] (8) Monitor the actual hydrogen pressure value and the target hydrogen pressure value, and calculate the difference between the two every 20 ms.

[0091] (9) Set the threshold to 15 kPa and compare the difference with the threshold.

[0092] (10a) If the difference is ≤15 kPa, the fuel cell engine continues to operate normally until it is shut down normally.

[0093] (10b) If the difference is greater than 15 kPa, perform diagnosis five: hydrogen injection valve opening stuck diagnosis. In this process, it is possible to diagnose whether the hydrogen injection valve is stuck when opening.

[0094] (11a) If the hydrogen injection valve is not stuck when opening, perform Diagnosis 6: Hydrogen injection valve return stroke stuck diagnosis. In this process, it is possible to diagnose whether the hydrogen injection valve is stuck when returning.

[0095] (11b) If the hydrogen injection valve is stuck when opening, a fault is reported: hydrogen injection valve stuck when opening fault.

[0096] (12a) If the hydrogen injection valve does not get stuck during the return stroke, it means that other reasons have caused the actual hydrogen pressure to deviate too much from the target hydrogen pressure, and other faults need to be checked.

[0097] (12b) If the hydrogen injection valve is stuck during the return stroke, a fault is reported: Hydrogen injection valve opening stuck fault

[0098] Specifically, Diagnosis 1 to Diagnosis 6 are as follows:

[0099] 1. Diagnosis 1: Diagnosis of hydrogen injection valve drive circuit, such as Fig. 9 shown.

[0100] Two parameters need to be confirmed: one is the hydrogen injection valve drive signal, and the other is the corresponding curve of duty cycle and drive current. The frequency of the drive signal is determined by the hydrogen injection valve. In the current solution, the control frequency used is 1kHz. In order to reduce the diagnosis time, only the boundary conditions are diagnosed, so the duty cycle is set to 10% and 90%.

[0101] 1. FCCU outputs hydrogen injection valve drive signal: 1kHz frequency, 10% duty cycle.

[0102] 2. The FCCU software reads the current feedback value and compares it with the calibration curve in the software.

[0103] 3a. The driving current complies with the curve, and the FCCU continues to output another driving signal: 1kHz frequency, 90% duty cycle.

[0104] 3b. The driving current does not conform to the curve, and the diagnostic result is: the driving current is abnormal.

[0105] 4. The FCCU software reads the current feedback value and compares it with the calibration curve in the software.

[0106] 5a. The driving current conforms to the curve, and the diagnostic result is: the driving current of the hydrogen injection valve is normal.

[0107] 5b. The driving current does not conform to the curve, and the diagnostic result is: the driving current is abnormal.

[0108] 2. Diagnosis 2: Hydrogen injection valve normally open diagnosis, such as Fig.10 shown.

[0109] Three parameters need to be confirmed: one is the hydrogen injection valve drive signal, the second is the duration, and the third is the hydrogen pressure rise threshold. First, to diagnose whether the hydrogen injection valve has a normally open fault, it is actually hoped that the hydrogen injection valve can be closed correctly when the FCCU controls it to close. Therefore, the FCCU inputs a 0% duty cycle and does not provide a drive current, that is, the hydrogen injection valve is controlled to close. Second, if the hydrogen injection valve is normally open, then the hydrogen pressure will increase with the accumulation of hydrogen flow. Considering that flow accumulation takes time, but the diagnosis cycle should not be too long, it is reasonable to set the duration to 5s. Third, even if the hydrogen injection valve is closed normally, it still has leakage. The normal leakage is 0.1ml / min. Within 5s, the maximum normal leakage is 7.5e-7g (at 300K, assuming the hydrogen density is 0.0899g / l). According to the ideal gas state equation (the total volume of the hydrogen pipeline is 0.05l, assuming the temperature is 300K), the maximum pressure rise value is calculated to be 0.018Pa. Considering the accuracy of the sensor, the hydrogen pressure rise threshold is set to 1 kPa. If it does not exceed this value, the hydrogen injection valve is normally closed, that is, it is not normally open.

[0110] 1. Close the stack inlet valve to prevent hydrogen from entering the stack. Open the main valve to maintain hydrogen supply.

[0111] 2. FCCU outputs hydrogen injection valve drive signal: 0% duty cycle.

[0112] 3. After 5 seconds, the FCCU software reads the increase in hydrogen pressure.

[0113] 4a. If the pressure rise value is ≤1kPa, it means that the hydrogen injection valve is not injecting hydrogen and is in a closed state. The diagnosis result is: the hydrogen injection valve is not normally open.

[0114] 4b. If the pressure rise value is greater than 1 kPa, it means that the hydrogen injection valve is spraying hydrogen and is in the open state. The diagnosis result is: the hydrogen injection valve is normally open.

[0115] 5. Open the stack inlet valve to allow hydrogen to enter the stack. Close the main valve to cut off the hydrogen supply.

[0116] 6. Use a certain control strategy to discharge all the hydrogen in the pipeline into the buffer tank.

[0117] 7. Close the stack entry valve to prevent hydrogen from entering the fuel cell stack.

[0118] 3. Diagnosis 3: Hydrogen injection valve normally closed diagnosis, such as Fig.11 shown.

[0119] Three parameters need to be confirmed: the first is the hydrogen injection valve drive signal, the second is the continuous injection time, and the third is the hydrogen pressure rise threshold. First, diagnose whether the hydrogen injection valve has a normally closed fault. In fact, it is hoped that the hydrogen injection valve can open correctly when the FCCU controls it to open. The driving frequency of the hydrogen injection valve used is 1kHz. According to Figure 2 The hydrogen injection valve flow curve shows that during the opening process, the minimum opening duty cycle is 40%, so the duty cycle is set to 40%. Second, as described in Diagnosis 2, the continuous injection time is set to 5s. Third, when the duty cycle is 40%, the hydrogen injection valve flow rate is 0.35g / s, and the mass of hydrogen after 5s of injection is 1.75g, which is converted to a pressure of 42.785kPa. Therefore, it is reasonable to set the threshold to 40kPa. If this value is exceeded, the hydrogen injection valve is normally opened, that is, it is not normally closed.

[0120] 1. Close the stack inlet valve to prevent hydrogen from entering the stack. Open the main valve to maintain hydrogen supply.

[0121] 2. FCCU outputs hydrogen injection valve drive signal: 1kHz frequency, 40% duty cycle.

[0122] 3. 5 seconds after injection, the FCCU software reads the increase in hydrogen pressure.

[0123] 4a. If the pressure rise value is ≥40kPa, it means that the hydrogen injection valve is spraying hydrogen normally and is in the open state. The diagnosis result is: the hydrogen injection valve is not always closed.

[0124] 4b. If the pressure rise value is less than 40 kPa, it means that the hydrogen injection valve is not spraying hydrogen normally and is in a closed or partially open state. The diagnosis result is: the hydrogen injection valve is normally closed.

[0125] 5. Open the stack inlet valve to allow hydrogen to enter the stack. Close the main valve to cut off the hydrogen supply.

[0126] 6. Use a certain control strategy to discharge all the hydrogen in the pipeline into the buffer tank.

[0127] 7. Close the stack entry valve to prevent hydrogen from entering the fuel cell stack.

[0128] 4. Diagnosis 4: Hydrogen pipeline leakage diagnosis, such as Fig.12 shown.

[0129] Four parameters need to be confirmed: one is the hydrogen injection valve drive signal, the second is the target hydrogen pressure value, the third is the pressure holding time, and the fourth is the hydrogen pressure drop threshold. First, in order to ensure that the hydrogen injection valve is always open and does not spray too much to cause excessive hydrogen pressure, it is reasonable to set the duty cycle of the hydrogen injection valve to 50%. Second, third, and fourth, according to the conditions of the hydrogen pipeline sealing test, the target hydrogen pressure value is set to 50kPa, the pressure holding time is set to 20min, and the hydrogen pressure drop threshold is set to 30kPa. If the pressure drop does not exceed 30kPa, it means that the pipeline is not leaking.

[0130] 1. Close the stack inlet valve to prevent hydrogen from entering the stack. Open the main valve to maintain hydrogen supply.

[0131] 2. FCCU outputs hydrogen injection valve drive signal: 1kHz frequency, 50% duty cycle.

[0132] 3. Continue spraying until the hydrogen pressure in the pipeline rises to 50kPa.

[0133] 4. Close the main valve, cut off the hydrogen supply, and close the hydrogen injection valve.

[0134] 5. After maintaining the pressure for 20 minutes, the FCCU software reads the drop in hydrogen pressure.

[0135] 6a. If the pressure drop value is ≤30kPa, the diagnosis result is: there is no leakage in the pipeline.

[0136] 6b. If the pressure drop value is greater than 30 kPa, the diagnosis result is: pipeline leakage.

[0137] 7. Open the stack inlet valve to allow hydrogen to enter the stack. Close the main valve to cut off the hydrogen supply.

[0138] 8. Use a certain control strategy to discharge all the hydrogen in the pipeline into the buffer tank.

[0139] 9. Close the stack entry valve to prevent hydrogen from entering the fuel cell stack.

[0140] 5. Diagnosis 5: Hydrogen injection valve opening stuck diagnosis, such as Fig.13 shown.

[0141] Four parameters need to be confirmed: the first is the hydrogen injection valve drive signal, the second is the continuous injection time, the third is the theoretical pressure value, and the fourth is the pressure difference threshold. First, diagnose whether the hydrogen injection valve is stuck during the opening process, which is actually to diagnose whether the hydrogen injection valve can reach the maximum flow rate, so the duty cycle is set to 100%. Second, as described in the second diagnosis, set the continuous injection time to 5s. Third, according to Figure 2, the injection flow rate is 1.54g / s at a duty cycle of 100%, and after 5s of injection, the pressure converted is 188.254kPa. Fourth, if the hydrogen injection valve gets stuck during the opening process, the flow rate at the time of the sticking is close to the maximum flow rate, and it is more difficult to diagnose. Therefore, the flow rate of 1.45g / s corresponding to a 90% duty cycle is selected. After 5s of injection, the pressure converted is 177.253kPa. Calculate the difference, which is 11kPa. Therefore, it is reasonable to set the pressure difference threshold to 10kPa. If this value is not exceeded, the hydrogen injection valve can be smoothly opened to the maximum flow position, that is, it is not stuck during the opening process.

[0142] 1. Close the stack inlet valve to prevent hydrogen from entering the stack. Open the main valve to maintain hydrogen supply.

[0143] 2. FCCU outputs hydrogen injection valve drive signal: 1kHz frequency, 100% duty cycle.

[0144] 3. 5 seconds after injection, calculate the difference between the actual pressure value and the theoretical pressure value.

[0145] 4. Set the threshold to 10 kPa and compare the difference with the threshold.

[0146] 5a. If the difference is ≤10kPa, the diagnostic result is: the hydrogen injection valve is not stuck during the opening process.

[0147] 5b. If the difference is greater than 10 kPa, the diagnostic result is: the hydrogen injection valve is stuck during the opening process.

[0148] 6. Open the stack inlet valve to allow hydrogen to enter the stack. Close the main valve to cut off the hydrogen supply.

[0149] 7. Use a certain control strategy to discharge all the hydrogen in the pipeline into the buffer tank.

[0150] 8. Close the stack entry valve to prevent hydrogen from entering the fuel cell stack.

[0151] VI. Diagnosis VI: Hydrogen injection valve return jam diagnosis, such as Fig.14 shown.

[0152] Three parameters need to be confirmed: one is the hydrogen injection valve drive signal, the second is the duration, and the third is the hydrogen pressure rise threshold. First, diagnosing whether the hydrogen injection valve is stuck during the return stroke is actually diagnosing whether the hydrogen injection valve can return to the closed position from the maximum flow position. Therefore, the duty cycle is first set to 100% and then to 0%. Second, as described in the second diagnosis, the continuous injection time is set to 5s. Third, for a normal hydrogen injection valve, the time to return from the maximum flow position to the closed position does not exceed 100ms. Assuming that the flow rate of the hydrogen injection valve decreases linearly during the return stroke, then within 100ms, the hydrogen injection valve sprays a total of 0.077g of hydrogen, which is converted to a pressure of 1.882kPa. Therefore, it is reasonable to set the threshold to 2kPa. If it does not exceed this value, the hydrogen injection valve can smoothly return to the closed position from the maximum flow position, that is, it is not stuck during the return stroke.

[0153] 1. Close the inlet valve to prevent hydrogen from entering the fuel cell stack. Close the main valve to cut off the hydrogen supply.

[0154] 2. FCCU outputs hydrogen injection valve drive signal: 100% duty cycle.

[0155] 3. Open the main valve and maintain the hydrogen supply.

[0156] 4. FCCU outputs hydrogen injection valve drive signal: 0% duty cycle.

[0157] 5. After 5 seconds, the FCCU software reads the increase in hydrogen pressure.

[0158] 6a. If the pressure rise value is ≤2kPa, it means that the hydrogen injection valve is closed during the normal return stroke. The diagnosis result is: the hydrogen injection valve is not stuck during the return stroke.

[0159] 6b. If the pressure rise value is greater than 2kPa, it means that the hydrogen injection valve is not closed normally during the return stroke. The diagnosis result is: the hydrogen injection valve is stuck during the return stroke.

[0160] 7. Open the stack inlet valve to allow hydrogen to enter the stack. Close the main valve to cut off the hydrogen supply.

[0161] 8. Use a certain control strategy to discharge all the hydrogen in the pipeline into the buffer tank.

[0162] 9. Close the stack entry valve to prevent hydrogen from entering the fuel cell stack.

[0163] In summary, this application has the following technical effects:

[0164] (1) The present application adds a stack inlet valve and a buffer tank to the original hydrogen circuit technical solution, which can be used in conjunction with the hydrogen injection valve fault diagnosis method of the present application;

[0165] (2) To address the problem that the FCCU software can only confirm that a command has been issued but does not know the actual execution result, the low-side PWM drive current feedback circuit can obtain the actual drive current provided by the FCCU to the hydrogen injection valve, and can determine whether the drive current output by the FCCU meets the duty cycle requirements of the FCCU software by calibrating a corresponding curve in the software.

[0166] (3) In view of the problem that the FCCU software has no diagnostic algorithm for hydrogen injection valve related faults, the present application has designed a hydrogen injection valve fault diagnosis method and improved the diagnostic algorithm. Using this method, the following faults can be diagnosed: hydrogen injection valve drive fault, hydrogen injection valve normally open fault, hydrogen injection valve normally closed fault, pipeline leakage fault, hydrogen injection valve opening stuck fault, hydrogen injection valve return stuck fault. By diagnosing these faults, corresponding measures can be formulated to avoid the situation where the hydrogen injection valve fails but the FCCU software cannot be informed in time, thereby avoiding the problem that the fuel cell engine continues to work when the hydrogen injection valve fails, which may eventually cause damage to the fuel cell engine stack.

[0167] According to the hydrogen injection valve fault diagnosis method proposed in the embodiment of the present application, the target drive signal can be determined according to the fault diagnosis type, and the hydrogen injection valve can be driven according to the target drive signal, and then the fault of the hydrogen injection valve can be diagnosed according to the operating parameters of the hydrogen injection valve under the target drive signal, so as to realize different types of fault diagnosis for the hydrogen injection valve, thereby facilitating the rapid location of the root cause of the fault when a hydrogen injection valve-related fault occurs in the subsequent process, avoiding the problem that the fuel cell engine continues to work when the hydrogen injection valve fails, which may eventually cause damage to the fuel cell engine stack, thereby improving the efficiency of fault detection and resolution.

[0168] Next, a hydrogen injection valve fault diagnosis device according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0169] Fig.15 It is a block diagram of a hydrogen injection valve fault diagnosis device according to an embodiment of the present application.

[0170] like Fig.15 As shown, the hydrogen injection valve fault diagnosis device 10 includes: an acquisition module 100 , a determination module 200 and a diagnosis module 300 .

[0171] Among them, the acquisition module 100 is used to obtain the fault diagnosis type of the hydrogen injection valve; the determination module 200 is used to determine the target drive signal of the hydrogen injection valve according to the fault diagnosis type; the diagnosis module 300 is used to diagnose the fault of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target drive signal.

[0172] In the embodiment of the present application, the fault diagnosis type includes first to sixth diagnosis types, wherein the first diagnosis type is the hydrogen injection valve drive current diagnosis, the second diagnosis type is the hydrogen injection valve normally open diagnosis, the third diagnosis type is the hydrogen injection valve normally closed diagnosis, the fourth diagnosis type is the hydrogen injection valve hydrogen pipeline leakage diagnosis, the fifth diagnosis type is the hydrogen injection valve opening stuck diagnosis, and the sixth diagnosis type is the hydrogen injection valve return stuck diagnosis.

[0173] In the embodiment of the present application, the target drive signal is the duty cycle of the PWM signal, and different fault diagnosis types correspond to different target drive signals.

[0174] In the embodiment of the present application, the device 10 of the embodiment of the present application further includes: a calculation module.

[0175] Among them, if the fault diagnosis type is the fifth diagnostic type, the calculation module is used to obtain the target pressure of the hydrogen pipeline of the hydrogen injection valve before determining the target drive signal of the hydrogen injection valve according to the fault diagnosis type; calculate the pressure difference between the actual pressure and the target pressure; if the pressure difference is greater than the target difference, determine the target drive signal of the hydrogen injection valve according to the fifth diagnostic type.

[0176] In the embodiment of the present application, the diagnosis module 300 is further used to: obtain reference parameters of the hydrogen injection valve under the target driving signal; and diagnose the fault of the hydrogen injection valve according to the reference parameters and the operating parameters.

[0177] In the embodiment of the present application, the device 10 of the embodiment of the present application further includes: a first diagnosis module.

[0178] In an embodiment of the present application, the first diagnostic module is used to obtain the pressure of the hydrogen pipeline of the hydrogen injection valve under the target drive signal before diagnosing the fault of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target drive signal if the fault diagnosis type is the second to sixth diagnostic types; and diagnose the fault of the hydrogen injection valve based on the pressure.

[0179] It should be noted that the above explanations of the embodiment of the hydrogen injection valve fault diagnosis method are also applicable to the hydrogen injection valve fault diagnosis device of this embodiment, and will not be repeated here.

[0180] According to the hydrogen injection valve fault diagnosis device proposed in the embodiment of the present application, the target drive signal can be determined according to the fault diagnosis type, and the hydrogen injection valve can be driven according to the target drive signal, and then the fault of the hydrogen injection valve can be diagnosed according to the operating parameters of the hydrogen injection valve under the target drive signal, so as to realize different types of fault diagnosis for the hydrogen injection valve, thereby facilitating the rapid location of the root cause of the fault when a hydrogen injection valve-related fault occurs in the subsequent process, avoiding the problem that the fuel cell engine continues to work when the hydrogen injection valve fails, which may eventually cause damage to the fuel cell engine stack, thereby improving the efficiency of fault detection and resolution.

[0181] Fig.16 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0182] A memory 1601 , a processor 1602 , and a computer program stored in the memory 1601 and executable on the processor 1602 .

[0183] When the processor 1602 executes the program, the hydrogen injection valve fault diagnosis method provided in the above embodiment is implemented.

[0184] Furthermore, the vehicle also includes:

[0185] The communication interface 1603 is used for communication between the memory 1601 and the processor 1602 .

[0186] The memory 1601 is used to store computer programs that can be executed on the processor 1602 .

[0187] The memory 1601 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0188] If the memory 1601, the processor 1602 and the communication interface 1603 are implemented independently, the communication interface 1603, the memory 1601 and the processor 1602 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.16 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0189] Optionally, in a specific implementation, if the memory 1601, the processor 1602 and the communication interface 1603 are integrated on a chip, the memory 1601, the processor 1602 and the communication interface 1603 can communicate with each other through an internal interface.

[0190] The processor 1602 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0191] The embodiment of the present application further provides a computer-readable storage medium on which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the above hydrogen injection valve fault diagnosis method is implemented.

[0192] The embodiment of the present application also provides a computer program product, including a computer program or instructions, which, when executed, implements the above hydrogen injection valve fault diagnosis method.

[0193] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0194] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0195] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0196] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0197] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. A method for diagnosing hydrogen injection valve faults, characterized in that: The following steps are involved: Get the fault diagnosis type of the hydrogen injection valve; determining a target drive signal for the hydrogen injection valve according to the fault diagnosis type; A fault of the hydrogen injection valve is diagnosed according to an operating parameter of the hydrogen injection valve under a target driving signal.

2. The hydrogen injection valve fault diagnosis method according to claim 1, characterized in that: The fault diagnosis types include first to sixth diagnosis types, wherein the first diagnosis type is hydrogen injection valve drive current diagnosis, the second diagnosis type is hydrogen injection valve normally open diagnosis, the third diagnosis type is hydrogen injection valve normally closed diagnosis, the fourth diagnosis type is hydrogen injection valve hydrogen pipeline leakage diagnosis, the fifth diagnosis type is hydrogen injection valve opening stuck diagnosis, and the sixth diagnosis type is hydrogen injection valve return stuck diagnosis.

3. The hydrogen injection valve fault diagnosis method according to claim 1 or 2, characterized in that: The target drive signal is a duty cycle of PWM, and different fault diagnosis types correspond to different target drive signals.

4. The hydrogen injection valve fault diagnosis method according to claim 2, characterized in that: If the fault diagnosis type is diagnosed as the fifth diagnosis type, before determining the target drive signal of the hydrogen injection valve according to the fault diagnosis type, the method further includes: Obtaining a target pressure of a hydrogen pipeline of the hydrogen injection valve; Calculate the pressure difference between the actual pressure and the target pressure; If the pressure difference is greater than the target difference, a target driving signal for the hydrogen injection valve is determined according to the fifth diagnosis type.

5. The hydrogen injection valve fault diagnosis method according to claim 2, characterized in that: The diagnosing the fault of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target driving signal includes: Acquiring reference parameters of the hydrogen injection valve under a target driving signal; A fault of the hydrogen injection valve is diagnosed according to the reference parameter and the operating parameter.

6. The hydrogen injection valve fault diagnosis method according to claim 5, characterized in that: Before diagnosing a fault of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target driving signal, the method includes: If the fault diagnosis type is the second to sixth diagnosis type, obtaining the pressure of the hydrogen pipeline of the hydrogen injection valve under the target driving signal of the hydrogen injection valve; A malfunction of the hydrogen injection valve is diagnosed based on the pressure.

7. A hydrogen injection valve fault diagnosis device, characterized in that: include: An acquisition module, used for acquiring a fault diagnosis type of a hydrogen injection valve; A determination module, configured to determine a target drive signal of the hydrogen injection valve according to the fault diagnosis type; The diagnosis module is used to diagnose the fault of the hydrogen injection valve according to the operating parameters of the hydrogen injection valve under the target driving signal.

8. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the hydrogen injection valve fault diagnosis method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: The computer program or instruction is executed by a processor to implement the hydrogen injection valve fault diagnosis method according to any one of claims 1 to 6.

10. An embodiment of the present application further provides a computer program product, characterized in that: The method comprises a computer program or an instruction, and when the computer program or the instruction is executed, the method for diagnosing a hydrogen injection valve fault as claimed in any one of claims 1 to 6 is implemented.

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