Hydrogen circulating pump control method, device, equipment and medium in fuel cell system

Abstract

The invention discloses a method, a device, equipment and a medium for controlling a hydrogen circulating pump in a fuel cell system, which are applied to the technical field of fuel cells, and specifically comprises the following steps: based on the current voltage of each single cell of an electric pile in the fuel cell system, determining that the current voltage dispersion difference of the single cell exceeds a standard deviation range; determining the rotating speed of the hydrogen circulating pump corresponding to the current galvanic pile current density as a calibrated rotating speed of the hydrogen circulating pump based on a pre-calibrated corresponding relation between the galvanic pile current density and the rotating speed of the hydrogen circulating pump; determining the rotating speed of a target hydrogen circulating pump based on the calibrated rotating speed of the hydrogen circulating pump and the rotating speed adjustment coefficient greater than 1; and controlling the operation of the hydrogen circulating pump according to the target rotating speed of the hydrogen circulating pump, so that the rotating speed of the hydrogen circulating pump can be dynamically increased and accurately controlled when the unexpected nitrogen concentration is gradually overhigh in the fuel cell system, the voltage deviation of a single cell can be reduced under the condition that the hardware cost is not increased, and the reliability of the fuel cell system is improved. The fuel cell system power supply effect is improved.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a method, device, equipment and medium for controlling a hydrogen circulation pump in a fuel cell system. Background Art

[0002] A fuel cell system is a power generation device that generates water through the reaction of hydrogen and oxygen in the fuel cell stack and supplies electricity to the outside. In the fuel cell system, the hydrogen system is a system that supplies hydrogen to the fuel cell stack as fuel. The hydrogen system mainly controls the speed of the hydrogen circulation pump and the opening of the hydrogen injection valve to achieve hydrogen supply at different flow rates and pressures. At present, the control of the speed of the hydrogen circulation pump mainly adopts an open-loop control method based on different fuel cell electrical densities. Under this open-loop control method, when the unexpected nitrogen concentration in the fuel cell system gradually becomes too high, due to the lack of a dynamic control strategy for the speed of the hydrogen circulation pump, the overall voltage of the single cell of the fuel cell stack will gradually decrease, and the dispersion of the single cell voltage will gradually increase, resulting in a deviation in the output voltage of the fuel cell stack, thereby affecting the power supply effect of the fuel cell system. Summary of the invention

[0003] The present application provides a method, device, equipment and medium for controlling a hydrogen circulation pump in a fuel cell system, which is used to solve the problem in the prior art that when an unexpected nitrogen concentration gradually becomes too high in the fuel cell system, it is difficult to accurately control the hydrogen circulation pump, thereby causing a deviation in the output voltage of the fuel cell stack, thereby affecting the power supply effect of the fuel cell system. Specifically, the technical solution provided by the present application is as follows:

[0004] On the one hand, the present application provides a method for controlling a hydrogen circulation pump in a fuel cell system, comprising:

[0005] When it is determined that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range based on the current voltage of each single cell of the stack in the fuel cell system, the speed of the hydrogen circulation pump corresponding to the current stack power density is determined to be the calibrated hydrogen circulation pump speed based on the correspondence between the pre-calibrated stack power density and the hydrogen circulation pump speed;

[0006] Determine a target hydrogen circulation pump speed based on a calibrated hydrogen circulation pump speed and a speed adjustment coefficient; wherein the speed adjustment coefficient is greater than 1;

[0007] Control the operation of the hydrogen circulation pump according to the target hydrogen circulation pump speed.

[0008] On the other hand, the present application also provides a hydrogen circulation pump control device in a fuel cell system, comprising:

[0009] A first determination unit is used to determine, based on the current voltage of each single cell of the stack in the fuel cell system, when the voltage dispersion of the current single cell of the stack exceeds the standard deviation range, and based on the correspondence between the pre-calibrated stack electric density and the hydrogen circulation pump speed, determine that the hydrogen circulation pump speed corresponding to the current stack electric density is the calibrated hydrogen circulation pump speed;

[0010] A second determination unit is used to determine a target hydrogen circulation pump speed based on a calibrated hydrogen circulation pump speed and a speed adjustment coefficient; wherein the speed adjustment coefficient is greater than 1;

[0011] The operation control unit is used to control the operation of the hydrogen circulation pump according to the target hydrogen circulation pump speed.

[0012] On the other hand, the present application also provides a fuel cell control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the hydrogen circulation pump control method in the above-mentioned fuel cell system is implemented.

[0013] On the other hand, the present application also provides a fuel cell system, including a fuel cell stack, a hydrogen system for supplying fuel to the fuel cell stack, an air system for supplying oxidant to the fuel cell stack, a cooling system for cooling the fuel cell stack, and the above-mentioned fuel cell control device.

[0014] On the other hand, the present application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed by a processor, the above-mentioned hydrogen circulation pump control method in the fuel cell system is implemented.

[0015] The beneficial effects of this application are as follows:

[0016] The present application determines whether an unexpected nitrogen concentration is gradually becoming too high by utilizing the current voltage of each single cell to detect whether the current single cell voltage dispersion exceeds the standard deviation range, thereby realizing accurate detection of the unexpected nitrogen concentration gradually becoming too high. Moreover, when it is determined that the unexpected nitrogen concentration is gradually becoming too high, the target hydrogen circulation pump speed is determined based on the calibrated hydrogen circulation pump speed corresponding to the current stack electrical density and a speed adjustment coefficient greater than 1, and the operation of the hydrogen circulation pump is controlled according to the target hydrogen circulation pump speed. This allows the hydrogen circulation pump speed to be dynamically increased and accurately controlled without increasing hardware costs, thereby reducing the single cell voltage deviation caused by the unexpected nitrogen concentration gradually becoming too high in the fuel cell system, thereby improving the power supply effect of the fuel cell system.

[0017] Other features and advantages of the present application will be described in the subsequent description, and in part, will become apparent from the description, or will be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the composition structure of the hydrogen system in the embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the general flow of the hydrogen circulation pump control method in the embodiment of the present application;

[0021] Figure 3 This is a functional structure diagram of a hydrogen circulation pump control device in an embodiment of the present application;

[0022] Figure 4 Schematic diagram of the hardware structure of the fuel cell control device in the embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and beneficial effects of this application clearer, the technical solution in the embodiment of this application will be clearly and completely described below in conjunction with the drawings in the embodiment of this application. Obviously, the described embodiment is only a part of the embodiment of this application, not all the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] In order to facilitate those skilled in the art to better understand the present application, the technical terms involved in the present application are briefly introduced below.

[0025] The hydrogen system is a system that supplies hydrogen to the fuel cell stack in the fuel cell system. Figure 1 As shown, the hydrogen system at least includes a hydrogen injection valve IJV, a hydrogen circulation pump FRB, a water tank WT, a drain valve ADV and a nitrogen discharge drain valve APV, etc. Specifically, the hydrogen injection valve IJV is used to control the flow of hydrogen entering the stack, the hydrogen circulation pump FRB is used to realize hydrogen circulation, the water tank WT is used to realize gas-liquid separation, the drain valve ADV is used to realize drainage, and the nitrogen discharge drain valve APV is used to realize nitrogen and water discharge.

[0026] A single cell is the main component of the fuel cell stack in a fuel cell system and consists of a bipolar plate and a MEA (Membrane Electrode Assembly).

[0027] The single cell voltage dispersion is used to characterize the degree of dispersion of the voltage of each single cell. In the present application, the single cell voltage dispersion is used to characterize the overall deviation of the single cell voltage.

[0028] It should be noted that the terms "first", "second", etc. mentioned in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0029] After introducing the technical terms involved in this application, the application scenarios and design concepts of this application are briefly introduced.

[0030] In a fuel cell system, the speed of the hydrogen circulation pump in the hydrogen system is usually controlled by an open-loop control method based on different stack electrical densities. Under this open-loop control method, when an unexpected nitrogen concentration gradually becomes too high in the fuel cell system, due to the lack of a dynamic control strategy for the speed of the hydrogen circulation pump, the overall voltage of the single cell of the stack will gradually decrease, and the dispersion of the single cell voltage will gradually increase, resulting in a deviation in the output voltage of the stack, which in turn affects the power supply effect of the fuel cell system.

[0031] To this end, the present application determines whether an unexpected nitrogen concentration is gradually becoming too high by utilizing the current voltage of each single cell to detect whether the current single cell voltage dispersion exceeds the standard deviation range, thereby realizing accurate detection of the unexpected nitrogen concentration gradually becoming too high. Moreover, when it is determined that the unexpected nitrogen concentration is gradually becoming too high, after determining the target hydrogen circulation pump speed based on the calibrated hydrogen circulation pump speed corresponding to the current stack electrical density and a speed adjustment coefficient greater than 1, the hydrogen circulation pump operation is controlled according to the target hydrogen circulation pump speed. This can achieve dynamic increase and precise control of the hydrogen circulation pump speed without increasing hardware costs, thereby reducing the single cell voltage deviation caused by the unexpected nitrogen concentration gradually becoming too high in the fuel cell system, and further improving the power supply effect of the fuel cell system.

[0032] After introducing the application scenarios and design ideas of the present application, the technical solutions provided by the present application are described in detail below.

[0033] The present application provides a method for controlling a hydrogen circulation pump in a fuel cell system, which can be applied to a fuel cell control device in the fuel cell system, such as a FCU (Fuel cell Control Unit) in the fuel cell system. Figure 2 As shown, the overview process of the hydrogen circulation pump control method in the fuel cell system provided by the embodiment of the present application is as follows:

[0034] Step 201: Based on the current voltage of each single cell of the stack in the fuel cell system, when it is determined that the current single cell voltage dispersion of the stack exceeds the standard deviation range, based on the pre-calibrated correspondence between the stack density and the hydrogen circulation pump speed, determine that the hydrogen circulation pump speed corresponding to the current stack density is the calibrated hydrogen circulation pump speed.

[0035] In practical applications, based on the current voltage of each single cell of the stack in the fuel cell system, when it is determined that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range, it can be determined that an unexpected nitrogen concentration gradually becomes too high in the fuel cell system, thereby enabling timely detection of the unexpected nitrogen concentration gradually becoming too high. Specifically, based on the current voltage of each single cell of the stack in the fuel cell system, when it is determined that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range, any of the following methods may be used, but not limited to:

[0036] The first method: based on the current voltage of each single cell, determine the current maximum single cell voltage, the current minimum single cell voltage and the current average single cell voltage; based on the current average single cell voltage and the current minimum single cell voltage, determine the current first voltage difference, and based on the current maximum single cell voltage and the current minimum single cell voltage, determine the current second voltage difference; if it is determined that the current first voltage difference is greater than or equal to the first voltage difference threshold and the current second voltage difference is greater than or equal to the second voltage difference threshold, and the current first voltage difference is greater than or equal to the first voltage difference threshold and the current second voltage difference is greater than or equal to the second voltage difference threshold for a duration greater than or equal to the duration threshold, then it is determined that the current single cell voltage dispersion of the battery stack exceeds the standard deviation range; wherein the first voltage difference threshold and the second voltage difference threshold are both determined based on the current battery stack electrical density, for example, 20mV and 30mV respectively.

[0037] The second method: based on the current voltage of each single cell, determine the current single cell voltage variance, the current minimum single cell voltage and the current average single cell voltage; based on the current average single cell voltage and the current minimum single cell voltage, determine the current first voltage difference; if it is determined that the current first voltage difference is greater than or equal to the first voltage difference threshold and the current single cell voltage variance is greater than or equal to the voltage variance threshold, and the duration of the current first voltage difference is greater than or equal to the first voltage difference threshold and the current single cell voltage variance is greater than or equal to the voltage variance threshold is greater than or equal to the duration threshold, then it is determined that the current single cell voltage dispersion of the battery stack exceeds the standard deviation range; wherein the first voltage difference and the voltage variance threshold are both determined based on the current battery stack electrical density.

[0038] The third method: based on the current voltage of each single cell, determine the current single cell voltage standard deviation, the current minimum single cell voltage and the current average single cell voltage; based on the current average single cell voltage and the current minimum single cell voltage, determine the current first voltage difference; if it is determined that the current first voltage difference is greater than or equal to the first voltage difference threshold and the current single cell voltage standard deviation is greater than or equal to the voltage standard deviation threshold, and the current first voltage difference is greater than or equal to the first voltage difference threshold and the current single cell voltage standard deviation is greater than or equal to the voltage standard deviation threshold for a duration greater than or equal to the duration threshold, then it is determined that the current single cell voltage dispersion of the battery stack exceeds the standard deviation range; wherein the first voltage difference and the voltage standard deviation threshold are both determined based on the current battery stack electrical density.

[0039] The time thresholds mentioned in the above three methods are set based on experiments or experience, such as 5 seconds.

[0040] Step 202: Determine a target hydrogen circulation pump speed based on a calibrated hydrogen circulation pump speed and a speed adjustment coefficient; wherein the speed adjustment coefficient is greater than 1.

[0041] In practical applications, the speed adjustment coefficient can be any value greater than 1. For example, the speed adjustment coefficient can be but not limited to 1.3, etc. When determining the target hydrogen circulation pump speed based on the calibrated hydrogen circulation pump speed and the speed adjustment coefficient, the product of the calibrated hydrogen circulation pump speed and the speed adjustment coefficient can be directly determined as the target hydrogen circulation pump speed.

[0042] Step 203: Control the operation of the hydrogen circulation pump according to the target hydrogen circulation pump speed.

[0043] In practical applications, after controlling the operation of the hydrogen circulation pump according to the target hydrogen circulation pump speed, the dynamic adjustment of the hydrogen circulation pump speed when the unexpected nitrogen concentration gradually becomes too high can be directly terminated. In order to further improve the dynamic adjustment effect of the hydrogen circulation pump speed, the speed adjustment operation can be continued to be cyclically executed until it is determined that the current single cell voltage dispersion of the battery stack does not exceed the standard deviation range based on the current voltage of each single cell of the battery stack; wherein the speed adjustment operation includes: after determining the waiting set time, obtaining the current voltage of each single cell of the battery stack; based on the current voltage of each single cell of the battery stack, when it is determined that the current single cell voltage dispersion of the battery stack exceeds the standard deviation range, based on the corresponding relationship between the pre-calibrated battery stack electrical density and the hydrogen circulation pump speed, determining that the hydrogen circulation pump speed corresponding to the current battery stack electrical density is the calibrated hydrogen circulation pump speed; based on the calibrated hydrogen circulation pump speed, the speed adjustment coefficient and the current number of executions of the speed adjustment operation, determining the target hydrogen circulation pump speed, and controlling the operation of the hydrogen circulation pump according to the target hydrogen circulation pump speed.

[0044] Based on the above embodiments, the present application also provides a hydrogen circulation pump control device in a fuel cell system, see Figure 3 As shown, the hydrogen circulation pump control device 300 in the fuel cell system provided in the embodiment of the present application at least includes:

[0045] The first determination unit 301 is used to determine, based on the current voltage of each single cell of the stack in the fuel cell system, when the voltage dispersion of the current single cell of the stack exceeds the standard deviation range, and based on the correspondence between the pre-calibrated stack power density and the hydrogen circulation pump speed, determine that the hydrogen circulation pump speed corresponding to the current stack power density is the calibrated hydrogen circulation pump speed;

[0046] The second determination unit 302 is used to determine the target speed of the hydrogen circulation pump based on the calibrated speed of the hydrogen circulation pump and the speed adjustment coefficient; wherein the speed adjustment coefficient is greater than 1;

[0047] The operation control unit 303 is used to control the operation of the hydrogen circulation pump according to the target hydrogen circulation pump speed.

[0048] In a possible implementation, based on the current voltage of each single cell of the stack in the fuel cell system, when it is determined that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range, the first determination unit 301 is specifically used to:

[0049] Based on the current voltage of each battery cell, determine the current maximum battery cell voltage, the current minimum battery cell voltage and the current average battery cell voltage;

[0050] Determine a current first voltage difference based on a current average cell voltage and a current minimum cell voltage, and determine a current second voltage difference based on a current maximum cell voltage and a current minimum cell voltage;

[0051] If it is determined that the current first voltage difference is greater than or equal to the first voltage difference threshold and the current second voltage difference is greater than or equal to the second voltage difference threshold, and the duration of the current first voltage difference being greater than or equal to the first voltage difference threshold and the current second voltage difference being greater than or equal to the second voltage difference threshold is greater than or equal to the duration threshold, then it is determined that the current single cell voltage dispersion of the battery stack exceeds the standard deviation range.

[0052] In a possible implementation manner, the first voltage difference threshold and the second voltage difference threshold are both determined based on the current stack electrical density.

[0053] In a possible implementation, based on the current voltage of each single cell of the stack in the fuel cell system, when it is determined that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range, the first determination unit 301 is specifically used to:

[0054] Based on the current voltage of each battery cell, determine the current battery cell voltage variance, the current minimum battery cell voltage and the current average battery cell voltage;

[0055] Determine a current first voltage difference based on a current average battery cell voltage and a current minimum battery cell voltage;

[0056] If it is determined that the current first voltage difference is greater than or equal to the first voltage difference threshold and the current single cell voltage variance is greater than or equal to the voltage variance threshold, and the duration of the current first voltage difference being greater than or equal to the first voltage difference threshold and the current single cell voltage variance being greater than or equal to the voltage variance threshold is greater than or equal to the duration threshold, then it is determined that the current single cell voltage dispersion of the battery stack exceeds the standard deviation range.

[0057] In a possible implementation manner, the first voltage difference value and the voltage variance threshold are both determined based on the current stack electrical density.

[0058] In a possible implementation, based on the current voltage of each single cell of the stack in the fuel cell system, when it is determined that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range, the first determination unit 301 is specifically used to:

[0059] Based on the current voltage of each battery cell, determine the current battery cell voltage standard deviation, the current minimum battery cell voltage and the current average battery cell voltage;

[0060] Determine a current first voltage difference based on a current average battery cell voltage and a current minimum battery cell voltage;

[0061] If it is determined that the current first voltage difference is greater than or equal to the first voltage difference threshold and the current single cell voltage standard deviation is greater than or equal to the voltage standard deviation threshold, and the duration of the current first voltage difference being greater than or equal to the first voltage difference threshold and the current single cell voltage standard deviation being greater than or equal to the voltage standard deviation threshold is greater than or equal to the duration threshold, then it is determined that the current single cell voltage dispersion of the battery stack exceeds the standard deviation range.

[0062] In a possible implementation manner, the first voltage difference value and the voltage standard deviation threshold are both determined based on the current stack electrical density.

[0063] In a possible implementation manner, after controlling the operation of the hydrogen circulation pump according to the target hydrogen circulation pump speed, the operation control unit 303 is further used to:

[0064] The speed adjustment operation is cyclically performed until it is determined that the voltage dispersion of the current single cell of the stack does not exceed the standard deviation range based on the current voltage of each single cell of the stack; the speed adjustment operation includes:

[0065] After determining the waiting time, obtain the current voltage of each battery in the battery stack;

[0066] When it is determined based on the current voltage of each single cell of the stack that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range, based on the correspondence between the pre-calibrated stack electric density and the hydrogen circulation pump speed, it is determined that the hydrogen circulation pump speed corresponding to the current stack electric density is the calibrated hydrogen circulation pump speed;

[0067] Based on the calibrated hydrogen circulation pump speed, the speed adjustment coefficient and the current number of executions of the speed adjustment operation, the target hydrogen circulation pump speed is determined, and the operation of the hydrogen circulation pump is controlled according to the target hydrogen circulation pump speed.

[0068] It should be noted that the principle of solving the technical problem by the hydrogen circulation pump control device 300 in the fuel cell system provided in the embodiment of the present application is similar to the hydrogen circulation pump control method in the fuel cell system provided in the embodiment of the present application. Therefore, the implementation of the hydrogen circulation pump control device 300 in the fuel cell system provided in the embodiment of the present application can refer to the implementation of the hydrogen circulation pump control method in the fuel cell system provided in the embodiment of the present application, and the repeated parts will not be repeated.

[0069] After introducing the hydrogen circulation pump control method and device in the fuel cell system provided in the embodiment of the present application, the fuel cell control device provided in the embodiment of the present application is briefly introduced next.

[0070] The fuel cell control device provided in the embodiment of the present application may be, but is not limited to, an FCU in a fuel cell system. Figure 4As shown, the fuel cell control device 400 provided in the embodiment of the present application includes at least a processor 401, a memory 402, and a computer program stored in the memory 402 and executable on the processor 401. When the processor 401 executes the computer program, the hydrogen circulation pump control method in the above-mentioned fuel cell system provided in the embodiment of the present application is implemented.

[0071] The fuel cell control device 400 provided in the embodiment of the present application may also include a bus 403 connecting different components (including the processor 401 and the memory 402). The bus 403 represents one or more of several types of bus structures, including a memory bus, a peripheral bus, a local bus, and the like.

[0072] The memory 402 may include a readable medium in the form of a volatile memory, such as a RAM (Random Access Memory) 4021 and / or a cache memory 4022, and may further include a ROM (Read Only Memory) 4023. The memory 402 may also include a program tool 4025 having a group (at least one) of program modules 4024, and the program modules 4024 include but are not limited to: an operating subsystem, one or more application programs, other program modules, and program data, each of which or some combination may include the implementation of a network environment.

[0073] The fuel cell control device 400 may also communicate with one or more external devices 404 (e.g., keyboards, remote controls, etc.), and may also communicate with one or more devices that enable a user to interact with the fuel cell control device 400 (e.g., mobile phones, computers, etc.), and / or communicate with any device that enables the fuel cell control device 400 to communicate with one or more other fuel cell control devices 400 (e.g., routers, modems, etc.). Such communication may be performed through an I / O (Input / Output) interface 405. Furthermore, the fuel cell control device 400 may also communicate with one or more networks (e.g., LAN (Local Area Network), WAN (Wide Area Network) and / or public networks, such as the Internet) through a network adapter 406. Figure 4 As shown, the network adapter 406 communicates with other modules of the fuel cell control device 400 via the bus 403. It should be understood that although Figure 4Not shown, other hardware and / or software modules may be used in conjunction with the fuel cell control device 400, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (Redundant Arrays of Independent Disks) subsystems, tape drives, and data backup storage subsystems.

[0074] It should be noted that Figure 4 The fuel cell control device 400 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0075] Based on the above embodiments, an embodiment of the present application also provides a fuel cell system, which fuel cell system at least includes a fuel cell stack, a hydrogen system for supplying fuel to the fuel cell stack, an air system for supplying oxidant to the fuel cell stack, a cooling system for cooling the fuel cell stack, and the above-mentioned fuel cell control device provided in the embodiment of the present application.

[0076] In addition, an embodiment of the present application also provides a new energy vehicle, which includes at least a body, a chassis frame, wheels, an electric motor, a vehicle control system, and the above-mentioned fuel cell system provided in an embodiment of the present application.

[0077] In addition, the embodiment of the present application further provides a computer-readable storage medium, which stores computer instructions, and when the computer instructions are executed by the processor, the method for controlling a hydrogen circulation pump in a fuel cell system provided in the embodiment of the present application is implemented. The computer instructions can be built into the processor, so that the processor implements the method for controlling a hydrogen circulation pump in the fuel cell system provided in the embodiment of the present application by executing the built-in computer instructions.

[0078] Moreover, the hydrogen circulation pump control method in the fuel cell system provided in the embodiment of the present application can also be implemented as a program product, which includes a program code. When the program code is run on a processor, it implements the hydrogen circulation pump control method in the above-mentioned fuel cell system provided in the embodiment of the present application.

[0079] The program product provided in the embodiments of the present application may adopt any combination of one or more readable media, the readable medium may be a readable signal medium or a readable storage medium, and the readable storage medium may be but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. Specifically, more specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable disk, a hard disk, RAM, ROM, EPROM (Erasable Programmable Read Only Memory), optical fiber, CD-ROM (Compact Disc Read-Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0080] The program product provided in the embodiment of the present application may adopt a CD-ROM and include program code, and may also be run on a fuel cell control device such as an FCU. However, the program product provided in the embodiment of the present application is not limited thereto. In the embodiment of the present application, the readable storage medium may be any tangible medium containing or storing a program, and the program may be used by or in combination with an instruction execution system, apparatus, or device.

[0081] It should be noted that, although several units or subunits of the device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of one unit described above can be further divided into multiple units to be embodied.

[0082] In addition, although the operations of the method of the present application are described in a specific order in the drawings, this does not require or imply that the operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0083] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0084] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for controlling a hydrogen circulation pump in a fuel cell system, characterized in that: include: When it is determined that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range based on the current voltage of each single cell of the stack in the fuel cell system, the speed of the hydrogen circulation pump corresponding to the current stack power density is determined to be the calibrated hydrogen circulation pump speed based on the correspondence between the pre-calibrated stack power density and the hydrogen circulation pump speed; Determining a target hydrogen circulation pump speed based on the calibrated hydrogen circulation pump speed and the speed adjustment coefficient; wherein the speed adjustment coefficient is greater than 1; The operation of the hydrogen circulation pump is controlled according to the target hydrogen circulation pump speed.

2. The method for controlling a hydrogen circulation pump in a fuel cell system according to claim 1, characterized in that: Determining, based on the current voltage of each single cell of the stack in the fuel cell system, that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range includes: Based on the current voltages of the battery cells, determining a current maximum battery cell voltage, a current minimum battery cell voltage, and a current average battery cell voltage; Determine a current first voltage difference value based on the current average cell voltage and the current minimum cell voltage, and determine a current second voltage difference value based on the current maximum cell voltage and the current minimum cell voltage; If it is determined that the current first voltage difference value is greater than or equal to the first voltage difference threshold and the current second voltage difference value is greater than or equal to the second voltage difference threshold, and the duration of the current first voltage difference value is greater than or equal to the first voltage difference threshold and the current second voltage difference value is greater than or equal to the second voltage difference threshold is greater than or equal to the duration threshold, then it is determined that the current single cell voltage dispersion of the battery stack exceeds the standard deviation range.

3. The method for controlling a hydrogen circulation pump in a fuel cell system according to claim 2, wherein: The first voltage difference threshold and the second voltage difference threshold are both determined based on the current stack electrical density.

4. The method for controlling a hydrogen circulation pump in a fuel cell system according to claim 1, wherein: Determining, based on the current voltage of each single cell of the stack in the fuel cell system, that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range includes: Based on the current voltage of each battery cell, determine the current battery cell voltage variance, the current minimum battery cell voltage and the current average battery cell voltage; Determine a current first voltage difference based on the current average battery cell voltage and the current minimum battery cell voltage; If it is determined that the current first voltage difference is greater than or equal to the first voltage difference threshold and the current single cell voltage variance is greater than or equal to the voltage variance threshold, and the duration of the current first voltage difference being greater than or equal to the first voltage difference threshold and the current single cell voltage variance being greater than or equal to the voltage variance threshold is greater than or equal to the duration threshold, it is determined that the current single cell voltage dispersion of the battery stack exceeds the standard deviation range; or; Based on the current voltage of each battery cell, determine the current battery cell voltage standard deviation, the current minimum battery cell voltage and the current average battery cell voltage; Determine a current first voltage difference based on the current average battery cell voltage and the current minimum battery cell voltage; If it is determined that the current first voltage difference is greater than or equal to the first voltage difference threshold and the current single cell voltage standard deviation is greater than or equal to the voltage standard deviation threshold, and the duration of the current first voltage difference is greater than or equal to the first voltage difference threshold and the current single cell voltage standard deviation is greater than or equal to the voltage standard deviation threshold is greater than or equal to the duration threshold, then it is determined that the current single cell voltage dispersion of the battery stack exceeds the standard deviation range.

5. The method for controlling a hydrogen circulation pump in a fuel cell system according to claim 4, characterized in that: The first voltage difference value, the voltage variance threshold value, and the voltage standard deviation threshold value are all determined based on the current stack electrical density.

6. The method for controlling a hydrogen circulation pump in a fuel cell system according to any one of claims 1 to 5, characterized in that: After the hydrogen circulation pump is controlled to operate according to the target hydrogen circulation pump speed, the method further includes cyclically performing a speed adjustment operation until it is determined that the voltage dispersion of the current single cell of the stack does not exceed the standard deviation range based on the current voltage of each single cell of the stack; The speed adjustment operation includes: After determining the waiting time, obtaining the current voltage of each battery cell of the battery stack; When it is determined based on the current voltage of each single cell of the stack that the voltage dispersion of the current single cell of the stack exceeds the standard deviation range, based on the pre-calibrated correspondence between the stack electric density and the hydrogen circulation pump speed, the hydrogen circulation pump speed corresponding to the current stack electric density is determined to be the calibrated hydrogen circulation pump speed; Based on the calibrated hydrogen circulation pump speed, the speed adjustment coefficient and the current number of executions of the speed adjustment operation, a target hydrogen circulation pump speed is determined, and the operation of the hydrogen circulation pump is controlled according to the target hydrogen circulation pump speed.

7. A hydrogen circulation pump control device in a fuel cell system, characterized in that: include: A first determination unit is used to determine, based on the current voltage of each single cell of the stack in the fuel cell system, when the voltage dispersion of the current single cell of the stack exceeds the standard deviation range, and based on the pre-calibrated correspondence between the stack electric density and the hydrogen circulation pump speed, determine that the hydrogen circulation pump speed corresponding to the current stack electric density is the calibrated hydrogen circulation pump speed; A second determination unit is used to determine a target hydrogen circulation pump speed based on the calibrated hydrogen circulation pump speed and the speed adjustment coefficient; wherein the speed adjustment coefficient is greater than 1; An operation control unit is used to control the operation of the hydrogen circulation pump according to the target hydrogen circulation pump speed.

8. A fuel cell control device, characterized in that: It comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for controlling a hydrogen circulation pump in a fuel cell system as claimed in any one of claims 1 to 6 is implemented.

9. A fuel cell system, comprising a fuel cell stack, a hydrogen system for supplying fuel to the fuel cell stack, an air system for supplying an oxidant to the fuel cell stack, and a cooling system for cooling the fuel cell stack, characterized in that: Also included is the fuel cell control device as claimed in claim 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the method for controlling a hydrogen circulation pump in a fuel cell system according to any one of claims 1 to 6 is implemented.

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