Fuel cell system fault diagnosis method and device, electronic equipment and storage medium

Abstract

The invention provides a fuel cell system fault diagnosis method and device, electronic equipment and a storage medium, and the method comprises the steps: respectively obtaining a plurality of output voltages of a fuel cell system through a preset sampling mode; wherein each output voltage has a different priority; sequentially comparing each output voltage with a corresponding preset voltage threshold range according to the priority, and determining a voltage comparison result; and according to a voltage comparison result, performing fault diagnosis on the fuel cell system so as to alleviate the technical problem that the system reliability is influenced by system false triggering caused by poor voltage signal monitoring precision of the cell system.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell applications, and in particular to a fuel cell system fault diagnosis method, device, electronic equipment and storage medium. Background Art

[0002] Voltage is one of the key parameters that reflects whether a fuel cell is working properly. Correctly detecting the total voltage of the fuel cell is related to whether the system can operate normally.

[0003] Normally, the total voltage of a fuel cell can be obtained through a component directly connected to the fuel cell - a high-voltage DC converter DCDC, or through a voltage monitor CVM.

[0004] During the operation of the fuel cell system, the fuel cell voltage is generally maintained within a certain range. For example, when a 400-cell fuel cell is running at a certain current density, the total voltage is normally between 190V and 380V. If the voltage is too high or too low, it will trigger related faults, causing the system to shut down, limit power or alarm. Therefore, the accuracy of the total voltage signal monitoring affects the reliability of the fuel cell system application. Summary of the invention

[0005] The purpose of the present invention is to provide a fuel cell system fault diagnosis method, device, electronic device and storage medium to alleviate the technical problem that the system is falsely triggered due to the poor voltage signal monitoring accuracy of the battery system, thereby affecting the system reliability.

[0006] In a first aspect, an embodiment of the present invention provides a fuel cell system fault diagnosis method, comprising:

[0007] By means of a preset sampling method, a plurality of output voltages of the fuel cell system are respectively obtained; wherein each of the output voltages has a different priority;

[0008] Comparing each output voltage with a corresponding preset voltage threshold range in turn according to the priority to determine a voltage comparison result;

[0009] According to the voltage comparison result, a fault diagnosis is performed on the fuel cell system.

[0010] In combination with the first aspect, an embodiment of the present invention provides another possible implementation of the first aspect, wherein the step of respectively acquiring a plurality of output voltages of the fuel cell system by a preset sampling method includes:

[0011] Detecting a first voltage at an output end of a fuel cell in the fuel cell system by a high voltage DC converter;

[0012] Detecting a second voltage at an output end of a fuel cell in the fuel cell system by a voltage patrol meter;

[0013] Detecting the average cell voltage of the fuel cell by a voltage patrol meter, and multiplying the average cell voltage by the number of cells of the fuel cell to determine a third voltage at the output end of the fuel cell in the fuel cell system;

[0014] Based on the output voltage and output current of the high-voltage DC converter and the input current of the high-voltage DC converter, the input voltage of the high-voltage DC converter is determined; wherein the input voltage of the high-voltage DC converter is used to characterize a fourth voltage at the output end of the fuel cell in the fuel cell system.

[0015] In combination with the first aspect, an embodiment of the present invention provides another possible implementation of the first aspect, wherein the output voltages are arranged in descending order of priority: a first voltage, a second voltage, a third voltage and a fourth voltage.

[0016] In combination with the first aspect, an embodiment of the present invention provides another possible implementation of the first aspect, wherein the step of comparing each output voltage with the corresponding preset voltage threshold range in sequence according to the priority, and determining the voltage comparison result and the target output voltage of the fuel cell system includes:

[0017] Determining whether the first voltage exceeds a first preset voltage threshold range;

[0018] If not, determining a first voltage comparison result and a target output voltage of the fuel cell system according to the first voltage, and reporting the first voltage comparison result and the target output voltage;

[0019] If exceeded, it is determined whether the output voltage corresponding to the next priority level is normal.

[0020] In combination with the first aspect, an embodiment of the present invention provides another possible implementation of the first aspect, wherein the step of comparing each output voltage with a corresponding preset voltage threshold range in sequence according to the priority, and determining a voltage comparison result and a target output voltage of the fuel cell system further includes:

[0021] Determining whether the second voltage exceeds a second preset voltage threshold range;

[0022] If it exceeds, determining a second voltage comparison result and a target output voltage of the fuel cell system according to the first voltage, and reporting the second voltage comparison result and the target output voltage;

[0023] If not, determine whether the output voltage corresponding to the next priority level is normal.

[0024] In combination with the first aspect, an embodiment of the present invention provides another possible implementation of the first aspect, wherein the step of comparing each output voltage with a corresponding preset voltage threshold range in sequence according to the priority, and determining a voltage comparison result and a target output voltage of the fuel cell system further includes:

[0025] Determining whether an absolute value of a difference between the second voltage and the third voltage, or an absolute value of a difference between the second voltage and the fourth voltage, exceeds a third preset voltage threshold range;

[0026] If exceeded, determining a third voltage comparison result and a target output voltage of the fuel cell system according to the second voltage and the third voltage, and reporting the third voltage comparison result and the target output voltage;

[0027] If not, a fourth voltage comparison result and a target output voltage of the fuel cell system are determined according to the second voltage, and the fourth voltage comparison result and the target output voltage are reported.

[0028] In combination with the first aspect, an embodiment of the present invention provides another possible implementation of the first aspect, wherein the step of performing fault diagnosis on the fuel cell system according to the voltage comparison result includes:

[0029] According to the first voltage comparison result, determining that the state of the fuel cell system is normal;

[0030] According to the second voltage comparison result, determining that an output voltage of a fuel cell in the fuel cell system is abnormal, and controlling the fuel cell system to shut down;

[0031] According to the third voltage comparison result, determining that an output voltage of a fuel cell in the fuel cell system is abnormal, and limiting power operation of the fuel cell system;

[0032] According to the fourth voltage comparison result, it is determined that there is an abnormality in the voltage collection of the high-voltage direct current converter, and the fuel cell system is controlled to operate normally.

[0033] In a second aspect, an embodiment of the present invention further provides a fuel cell system fault diagnosis device, comprising:

[0034] An acquisition module, which acquires a plurality of output voltages of the fuel cell system respectively through a preset sampling method; wherein each of the output voltages has a different priority;

[0035] A determination module compares each output voltage with a corresponding preset voltage threshold range in turn according to the priority to determine a voltage comparison result;

[0036] A diagnosis module performs fault diagnosis on the fuel cell system according to the voltage comparison result.

[0037] In a third aspect, an embodiment provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the method described in any of the aforementioned implementation methods are implemented.

[0038] In a fourth aspect, an embodiment provides a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the steps of the method described in any one of the aforementioned implementations.

[0039] The embodiments of the present invention provide a fuel cell system fault diagnosis method, device, electronic device and storage medium, which can determine the preset sampling method according to the actual application scenario of the fuel cell system, and then obtain each output voltage of the fuel cell based on sampling in multiple ways, and compare them with their respective preset voltage thresholds in turn according to the priority corresponding to each output voltage to obtain a comparison result; based on the voltage comparison result, the state of the fuel cell system can be accurately diagnosed, thereby ensuring the accuracy of the actual output voltage of the fuel cell, avoiding false triggering of fuel cell system faults, and ensuring the application reliability of the fuel cell system.

[0040] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A voltage-current polarization curve diagram of a fuel cell provided by an embodiment of the present invention;

[0044] Figure 2A flow chart of a fuel cell system fault diagnosis method provided by an embodiment of the present invention;

[0045] Figure 3 A flow chart of another fuel cell system fault diagnosis method provided by an embodiment of the present invention;

[0046] Figure 4 A schematic diagram of functional modules of a fuel cell system fault diagnosis device provided by an embodiment of the present invention;

[0047] Figure 5 A schematic diagram of the hardware architecture of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] During the operation of a fuel cell, the voltage changes with the current, such as Figure 1 As shown, the polarization curve of a single fuel cell can be seen, the horizontal axis is the current density, and the vertical axis is the cell voltage.

[0050] Generally speaking, the output voltage of a fuel cell can be detected through a high-voltage DCDC and a voltage monitor CVM; the high-voltage DCDC contains a voltage sensor that can detect the overall voltage of the fuel cell and the current of the fuel cell; the output end of the DCDC is connected to the power battery, which can detect the output current and output voltage, and send the detection result to the fuel cell system controller. If the fuel cell system controller detects an abnormal signal, it will perform corresponding fault processing. In addition, the CVM can also be used to monitor the voltage signal of each single channel of the fuel cell, and send key signals such as the average single voltage signal to the fuel cell controller.

[0051] In actual application, if the voltage detection module of the high-voltage DCDC fails but the fuel cell voltage is normal, an output voltage with a large error may be detected, that is, a false alarm occurs, which may cause the fuel cell system to shut down unnecessarily.

[0052] Based on this, an embodiment of the present invention provides a fuel cell system fault diagnosis method, device, electronic device and storage medium, which accurately detects the output voltage of the fuel cell in the fuel cell system, thereby achieving accuracy in fuel cell system fault diagnosis, avoiding false fault triggering, and improving the reliability of the fuel cell system application.

[0053] To facilitate understanding of this embodiment, a fuel cell system fault diagnosis method disclosed in an embodiment of the present invention is first introduced in detail. This method can be applied to intelligent control devices such as host computers, servers, battery management systems, and vehicle computers.

[0054] Figure 2 A flow chart of a fuel cell system fault diagnosis method provided by an embodiment of the present invention.

[0055] Reference Figure 2 , the fuel cell system fault diagnosis method mainly includes the following steps:

[0056] Step S102 , obtaining a plurality of output voltages of the fuel cell system respectively through a preset sampling method.

[0057] As an optional embodiment, before step S102, the inventors may find through research that a corresponding number of output voltage sampling methods can be determined according to the business scenario types of the fuel cell system application and the business reliability requirements of different scenarios; according to various preset sampling methods, the output voltage of the fuel cell system sampled in various ways can be obtained; wherein the output voltage obtained by each sampling method has a different priority level, that is, each output voltage has a different priority level, and the priority level can be understood as the order of participating in the judgment in the fuel cell system fault diagnosis.

[0058] Step S104 , comparing each output voltage with a corresponding preset voltage threshold range in turn according to the priority, and determining a voltage comparison result.

[0059] Here, according to the priority order corresponding to each output voltage, the output voltages are compared with the preset voltage threshold ranges corresponding thereto in turn, thereby determining such voltage comparison results.

[0060] Step S106: performing fault diagnosis on the fuel cell system according to the voltage comparison result.

[0061] The voltage comparison results corresponding to the various sampling methods determined in the above steps can accurately diagnose the faults of the fuel cell system.

[0062] In a preferred embodiment of actual application, a preset sampling method can be determined according to the actual application scenario of the fuel cell system, and then the output voltages of the fuel cell are respectively obtained based on sampling in multiple ways, and each output voltage is compared with its respective preset voltage threshold in turn according to the priority corresponding to the output voltage to obtain a comparison result; based on the voltage comparison result, the state of the fuel cell system can be accurately diagnosed, and then the actual output voltage of the fuel cell can be accurately determined, thereby avoiding false triggering of faults in the fuel cell system and ensuring the application reliability of the fuel cell system.

[0063] As an optional embodiment, the embodiment of the present invention can compare the voltage signals sampled or calculated by different controllers with their corresponding voltage thresholds. According to the comparison result, the actual state of the fuel cell system can be determined, and whether it is faulty can be diagnosed and the actual output voltage of the fuel cell system in this state can be accurately detected, that is, the target output voltage signal V; the target output voltage signal V can be used as an input for controller fault judgment and related logic applications of the fuel cell system.

[0064] In some embodiments, a preset sampling path may be determined according to the accuracy requirements corresponding to the actual application scenario, and then the output voltage corresponding to each path may be obtained; illustratively, step S102 may include:

[0065] Step 1.1), detecting a first voltage at an output end of a fuel cell in the fuel cell system by a high voltage DC converter.

[0066] The first voltage V1 may be a total voltage signal sampled by the high voltage direct current converter DCDC.

[0067] Step 1.2), detecting a second voltage at an output end of a fuel cell in the fuel cell system by using a voltage patrol meter.

[0068] The second voltage V2 can be understood as a total voltage signal sampled by the voltage monitor CVM.

[0069] Step 1.3), detecting the average cell voltage of the fuel cell by a voltage patrol meter, and multiplying the average cell voltage by the number of cells of the fuel cell to determine a third voltage at the output end of the fuel cell in the fuel cell system.

[0070] The third voltage V3 can be understood as the product of the average cell voltage sampled and calculated by the voltage monitor CVM and the total number of cells in the fuel cell system. The CVM will send the average cell voltage signal to the system controller, and then multiply it by the corresponding number of cells to obtain the third voltage.

[0071] Step 1.4), determining the input voltage of the high-voltage DC converter based on the output voltage and output current of the high-voltage DC converter and the input current of the high-voltage DC converter.

[0072] Among them, the input voltage of the high-voltage DC converter DCDC can be used to characterize the fourth voltage of the output end of the fuel cell in the fuel cell system. It can be understood that according to the power balance relationship between the output end and the input end of the high-voltage DC converter, it can be known that the input voltage V4 of the high-voltage DC converter can be calculated by the following formula:

[0073]

[0074] It should be noted that the input end of the DCDC has a 1% to 2% power loss compared to the output end, so the current-voltage product of the input end is almost equal to the current-voltage product of the output end. The input end voltage signal V4 can be inversely calculated from the output end current-voltage and the output end current.

[0075] In some embodiments, the above-mentioned output voltages are arranged in order of priority from high to low: a first voltage, a second voltage, a third voltage and a fourth voltage, that is, the first voltage has the highest priority, the second voltage has the second priority, the third voltage has the third priority, and the fourth voltage has the lowest priority.

[0076] Based on the above embodiments, Figure 3 As shown, an embodiment of the present invention further provides a fuel cell system fault diagnosis method, which can receive the first voltage V1, the second voltage V2, the third voltage V3 and the fourth voltage V4 calculated or collected in the above embodiment, and perform fault diagnosis according to step S104 and step S106. Specifically, the step may include:

[0077] Step 2.1), determine whether the first voltage exceeds a first preset voltage threshold range.

[0078] The first voltage V1, ie, the total voltage signal V1 of the output end of the fuel cell detected by the high voltage DC converter DCDC, is used as the default signal. As an example, the first preset voltage threshold range can be selected from 190V to 380V.

[0079] Step 2.2), if it is not exceeded, determining a first voltage comparison result and a target output voltage of the fuel cell system according to the first voltage, and reporting the first voltage comparison result and the target output voltage.

[0080] Here, the first voltage V1 can be reported as the target output voltage. At this time, according to the first voltage comparison result, it can be determined that the state of the fuel cell system is normal.

[0081] Step 2.3), if exceeded, determine whether the output voltage corresponding to the next priority is normal; that is, determine whether the second voltage exceeds the second preset voltage threshold range.

[0082] If the first voltage V1 exceeds the normal range, the second voltage V2 signal is checked to see if it is abnormal; the second preset voltage threshold range can be selected from 190V to 380V.

[0083] Step 2.4), if exceeded, determine a second voltage comparison result and a target output voltage of the fuel cell system according to the first voltage, and report the second voltage comparison result and the target output voltage.

[0084] Here, if the second voltage exceeds the second preset voltage threshold range, the first voltage is reported as the target output voltage, and based on the second voltage comparison result, it is determined that the output voltage of the fuel cell in the fuel cell system is abnormal, and the fuel cell system is controlled to shut down.

[0085] Step 2.5), if not exceeded, determine whether the output voltage corresponding to the next priority is normal; determine whether the absolute value of the difference between the second voltage and the third voltage, or the absolute value of the difference between the second voltage and the fourth voltage, exceeds the third preset voltage threshold range.

[0086] Here, the absolute value of the difference between the second voltage and the third voltage may be calculated, or the absolute value of the difference between the second voltage and the fourth voltage may be calculated, and the judgment is made based on the comparison between the absolute value and the third preset voltage threshold range.

[0087] The third preset voltage threshold range can be adjusted according to actual conditions. In the embodiment of the present invention, 5V, 10V, and 15V can be selected, preferably 10V.

[0088] Step 2.6), if exceeded, determine the third voltage comparison result and the target output voltage of the fuel cell system based on the second voltage and the third voltage, and report the third voltage comparison result and the target output voltage; based on the third voltage comparison result, determine that the output voltage of the fuel cell in the fuel cell system is abnormal, and limit the power operation of the fuel cell system.

[0089] The target output voltage may be determined and reported based on the average value of the second voltage and the third voltage; the power-limited operation refers to an operation state in which the fuel cell system operates at a lower power output.

[0090] Step 2.7), if it is not exceeded, determine the fourth voltage comparison result and the target output voltage of the fuel cell system according to the second voltage, and report the fourth voltage comparison result and the target output voltage. According to the fourth voltage comparison result, determine that there is an abnormality in the voltage collection of the high-voltage DC converter, and control the fuel cell system to operate normally.

[0091] It should be noted that the second voltage V2 at this time meets the second preset voltage threshold range, that is, the second voltage V2 is normal, and there is a third voltage or the fourth voltage and the absolute value of the difference between the second voltage meets the third preset voltage threshold range, it can be considered that the third voltage or the fourth voltage is extremely close to the second voltage. In this case, the second voltage V2 can be reported as the target output voltage, and it can be identified that only the voltage acquisition of the high-voltage DC converter is faulty at this time, and the fuel cell system is in normal condition and can operate normally without shutdown.

[0092] The key to the embodiment of the present invention is to use the fuel cell output terminal voltage signals sampled by multiple ways to make a comprehensive judgment, and finally obtain the total voltage signal corresponding to the fuel cell, so as to avoid the fuel cell system being in a normal state, but due to the problem of the internal voltage sensor of the high-voltage DCDC, the internal voltage detection result of the fuel cell system is abnormal, causing a false fault alarm, thereby affecting the normal operation of the system.

[0093] like Figure 4 As shown, an embodiment of the present invention provides a fuel cell system fault diagnosis device, comprising:

[0094] An acquisition module, which acquires a plurality of output voltages of the fuel cell system respectively through a preset sampling method; wherein each of the output voltages has a different priority;

[0095] A determination module compares each output voltage with a corresponding preset voltage threshold range in turn according to the priority to determine a voltage comparison result;

[0096] A diagnosis module performs fault diagnosis on the fuel cell system according to the voltage comparison result.

[0097] The embodiment of the present invention uses voltage parameters of multiple fuel cell terminals as parameters for internal logic judgment of the fuel cell controller, rather than just using the fuel cell voltage signal uploaded by a certain component, thereby effectively avoiding problems caused by inaccurate voltage signals.

[0098] In some embodiments, the acquisition module is further specifically used to detect a first voltage at an output end of a fuel cell in a fuel cell system through a high-voltage DC converter; detect a second voltage at an output end of a fuel cell in a fuel cell system through a voltage patroller; detect an average cell voltage of the fuel cell through a voltage patroller, and multiply the average cell voltage by the number of cells of the fuel cell to determine a third voltage at an output end of the fuel cell in the fuel cell system; determine an input voltage of the high-voltage DC converter based on an output voltage and an output current of the high-voltage DC converter and an input current of the high-voltage DC converter; wherein the input voltage of the high-voltage DC converter is used to characterize a fourth voltage at an output end of a fuel cell in a fuel cell system.

[0099] In some embodiments, the output voltages are arranged in descending order of priority: a first voltage, a second voltage, a third voltage, and a fourth voltage.

[0100] In some embodiments, the determination module is also specifically used to determine whether the first voltage exceeds a first preset voltage threshold range; if not, determining a first voltage comparison result and a target output voltage of the fuel cell system based on the first voltage, and reporting the first voltage comparison result and the target output voltage; if exceeded, determining whether the output voltage corresponding to the next priority is normal.

[0101] In some embodiments, the determination module is also specifically used to determine whether the second voltage exceeds a second preset voltage threshold range; if so, determine the second voltage comparison result and the target output voltage of the fuel cell system based on the first voltage, and report the second voltage comparison result and the target output voltage; if not, determine whether the output voltage corresponding to the next priority is normal.

[0102] In some embodiments, the determination module is further specifically used to determine whether the absolute value of the difference between the second voltage and the third voltage, or the absolute value of the difference between the second voltage and the fourth voltage, exceeds a third preset voltage threshold range; if exceeded, the third voltage comparison result and the target output voltage of the fuel cell system are determined based on the second voltage and the third voltage, and the third voltage comparison result and the target output voltage are reported; if not exceeded, the fourth voltage comparison result and the target output voltage of the fuel cell system are determined based on the second voltage, and the fourth voltage comparison result and the target output voltage are reported.

[0103] In some embodiments, the diagnostic module is further specifically used to determine, based on the first voltage comparison result, that the state of the fuel cell system is normal; based on the second voltage comparison result, determine that there is an abnormality in the output voltage of the fuel cell in the fuel cell system, and control the fuel cell system to shut down; based on the third voltage comparison result, determine that there is an abnormality in the output voltage of the fuel cell in the fuel cell system, and limit the power to operate the fuel cell system; based on the fourth voltage comparison result, determine that there is an abnormality in the voltage collection of the high-voltage DC converter, and control the fuel cell system to operate normally.

[0104] An embodiment of the present invention provides an electronic device for implementing an electronic device. In this embodiment, the electronic device may be, but is not limited to, a personal computer (PC), a laptop computer, a monitoring device, a server, or other computer device with analysis and processing capabilities.

[0105] As an exemplary embodiment, see Figure 5 The electronic device 110 includes a communication interface 111, a processor 112, a memory 113 and a bus 114. The processor 112, the communication interface 111 and the memory 113 are connected via the bus 114. The memory 113 is used to store a computer program that supports the processor 112 to execute the method. The processor 112 is configured to execute the program stored in the memory 113.

[0106] The machine-readable storage medium mentioned in this article can be any electronic, magnetic, optical or other physical storage device that can contain or store information, such as executable instructions, data, etc. For example, the machine-readable storage medium can be: RAM (Radom Access Memory), volatile memory, non-volatile memory, flash memory, storage drive (such as hard disk drive), any type of storage disk (such as CD, DVD, etc.), or similar storage medium, or a combination thereof.

[0107] The non-volatile medium may be a non-volatile memory, a flash memory, a storage drive (such as a hard drive), any type of storage disk (such as a CD, DVD, etc.), or a similar non-volatile storage medium, or a combination thereof.

[0108] It can be understood that the specific operation methods of each functional module in this embodiment can refer to the detailed description of the corresponding steps in the above method embodiment, and will not be repeated here.

[0109] The computer-readable storage medium provided in the embodiment of the present invention stores a computer program. When the computer program code is executed, the method described in any of the above embodiments can be implemented. For specific implementation, please refer to the method embodiment, which will not be described in detail here.

[0110] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0111] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0112] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0113] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily conceive of changes, or make equivalent replacements for some of the technical features therein. Such modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A fuel cell system fault diagnosis method, characterized in that: include: By means of a preset sampling method, a plurality of output voltages of the fuel cell system are respectively obtained; wherein each of the output voltages has a different priority; Comparing each output voltage with a corresponding preset voltage threshold range in turn according to the priority to determine a voltage comparison result; According to the voltage comparison result, a fault diagnosis is performed on the fuel cell system.

2. The method according to claim 1, characterized in that The steps of respectively obtaining a plurality of output voltages of the fuel cell system by a preset sampling method include: Detecting a first voltage at an output end of a fuel cell in the fuel cell system by a high voltage DC converter; Detecting a second voltage at an output end of a fuel cell in the fuel cell system by a voltage patrol meter; Detecting the average cell voltage of the fuel cell by a voltage patrol meter, and multiplying the average cell voltage by the number of cells of the fuel cell to determine a third voltage at the output end of the fuel cell in the fuel cell system; Based on the output voltage and output current of the high-voltage DC converter and the input current of the high-voltage DC converter, the input voltage of the high-voltage DC converter is determined; wherein the input voltage of the high-voltage DC converter is used to characterize a fourth voltage at the output end of the fuel cell in the fuel cell system.

3. The method according to claim 2, characterized in that The output voltages are arranged in descending order of priority: a first voltage, a second voltage, a third voltage and a fourth voltage.

4. The method according to claim 3, characterized in that: The step of comparing each output voltage with a corresponding preset voltage threshold range in turn according to the priority to determine a voltage comparison result includes: Determining whether the first voltage exceeds a first preset voltage threshold range; If not, determining a first voltage comparison result and a target output voltage of the fuel cell system according to the first voltage, and reporting the first voltage comparison result and the target output voltage; If exceeded, it is determined whether the output voltage corresponding to the next priority level is normal.

5. The method according to claim 4, characterized in that The step of comparing each output voltage with a corresponding preset voltage threshold range in sequence according to the priority to determine a voltage comparison result also includes: Determining whether the second voltage exceeds a second preset voltage threshold range; If it exceeds, determining a second voltage comparison result and a target output voltage of the fuel cell system according to the first voltage, and reporting the second voltage comparison result and the target output voltage; If not, determine whether the output voltage corresponding to the next priority level is normal.

6. The method according to claim 5, characterized in that The step of comparing each output voltage with a corresponding preset voltage threshold range in sequence according to the priority to determine a voltage comparison result also includes: Determining whether an absolute value of a difference between the second voltage and the third voltage, or an absolute value of a difference between the second voltage and the fourth voltage, exceeds a third preset voltage threshold range; If exceeded, determining a third voltage comparison result and a target output voltage of the fuel cell system according to the second voltage and the third voltage, and reporting the third voltage comparison result and the target output voltage; If not, a fourth voltage comparison result and a target output voltage of the fuel cell system are determined according to the second voltage, and the fourth voltage comparison result and the target output voltage are reported.

7. The method according to claim 6, characterized in that The step of performing fault diagnosis on the fuel cell system according to the voltage comparison result comprises: According to the first voltage comparison result, determining that the state of the fuel cell system is normal; According to the second voltage comparison result, determining that an output voltage of a fuel cell in the fuel cell system is abnormal, and controlling the fuel cell system to shut down; According to the third voltage comparison result, determining that an output voltage of a fuel cell in the fuel cell system is abnormal, and limiting power operation of the fuel cell system; According to the fourth voltage comparison result, it is determined that there is an abnormality in the voltage collection of the high-voltage direct current converter, and the fuel cell system is controlled to operate normally.

8. A fuel cell system fault diagnosis device, characterized in that: include: An acquisition module, which acquires a plurality of output voltages of the fuel cell system respectively through a preset sampling method; wherein each of the output voltages has a different priority; A determination module compares each output voltage with a corresponding preset voltage threshold range in turn according to the priority to determine a voltage comparison result; A diagnosis module performs fault diagnosis on the fuel cell system according to the voltage comparison result.

9. An electronic device, characterized in that: The method comprises a memory, a processor, and a program stored in the memory and capable of being run on the processor, wherein the processor implements the method according to any one of claims 1 to 7 when executing the program.

10. A computer-readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

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