Method of a fuel cell system, fuel cell system and vehicle

Abstract

The application discloses a fuel cell, a control method thereof, a vehicle and a computer storage medium. The control method of the fuel cell comprises the following steps: obtaining an operation state of an upper-layer power consumption object and obtaining a hydrogen demand according to the state of the upper-layer power consumption object; detecting an actual hydrogen supply of an anode of the fuel cell; and calculating a pull current of the fuel cell according to the actual hydrogen supply and the hydrogen demand. According to the control method of the fuel cell, the fuel cell can be prevented from working under the condition of continuous hydrogen deficiency, the safety performance of the fuel cell is improved, and the hydrogen pressure on the anode side of the fuel cell is sufficient when the upper-layer power consumption object works.

Description

Technical Field

[0001] This invention relates to the field of fuel cells, and in particular to a method for using a fuel cell system, a fuel cell system, and a vehicle. Background Technology

[0002] In related technologies, the hydrogen pressure at the anode of existing fuel cells is usually controlled by a solenoid valve. When the fuel cell is used for a long time, the solenoid valve will age, and its ability to control the hydrogen pressure at the anode of the fuel cell will decrease. Therefore, there are problems such as the solenoid valve aging and inability to meet normal pressure control, which leads to insufficient hydrogen pressure on the anode side of the fuel cell, and in severe cases, it can cause hydrogen shortage in the fuel cell. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this invention is to provide a control method for a fuel cell that can prevent the fuel cell from operating under continuously low hydrogen conditions, improve the safety performance of the fuel cell, and ensure sufficient hydrogen pressure on the anode side of the fuel cell during operation of the upstream power user.

[0004] The present invention also proposes a fuel cell system that applies the above-described control method.

[0005] The present invention also proposes a vehicle having the aforementioned fuel cell.

[0006] The control method for a fuel cell according to the present invention includes: acquiring the operating status of an upper-level power user and acquiring the hydrogen demand based on the status of the upper-level power user; detecting the current actual hydrogen supply of the fuel cell anode; and calculating the load current of the fuel cell based on the actual hydrogen supply and the hydrogen demand.

[0007] According to the fuel cell control method of the present invention, the control method first obtains the hydrogen demand and the current actual hydrogen supply at the anode of the fuel cell, and then calculates the load current of the fuel cell based on the actual hydrogen supply and the hydrogen demand. Therefore, when the hydrogen pressure on the anode side of the fuel cell is insufficient, the load current of the fuel cell is controlled to avoid the fuel cell from operating under continuous hydrogen shortage conditions and improve the safety performance of the fuel cell.

[0008] In some embodiments of the present invention, obtaining the operating status of the upper-level power user and obtaining the hydrogen demand based on the status of the upper-level power user includes: obtaining the real-time power request of the upper-level power user; calculating the preset load current of the fuel cell based on the real-time power request; and calculating the hydrogen demand of the fuel cell based on the preset load current.

[0009] In some embodiments of the present invention, detecting the current actual hydrogen supply of the fuel cell anode includes: obtaining the current hydrogen pressure of the fuel cell anode and calculating the hydrogen supply based on the current hydrogen pressure.

[0010] In some embodiments of the present invention, the step of calculating the load current of the fuel cell based on the actual hydrogen supply and the hydrogen demand includes: comparing the preset hydrogen supply at the anode with the actual hydrogen supply and obtaining a comparison result; and selecting to output at the preset load current or at the maximum current of the fuel cell based on the comparison result.

[0011] In some embodiments of the present invention, if the actual hydrogen supply is greater than the hydrogen demand, the output is performed with a preset load current; if the actual hydrogen supply is not greater than the hydrogen demand, the output is performed with the maximum current.

[0012] In some embodiments of the present invention, the control method further includes: obtaining the power request value of the upper-level power user, calculating a preset load current based on the power request value, determining a hydrogen pressure setting value corresponding to the preset load current based on the preset load current; if the current hydrogen pressure is less than the hydrogen pressure setting value, determining the load current of the fuel cell based on the current hydrogen pressure and the hydrogen pressure setting value.

[0013] In some embodiments of the present invention, determining the load current of the fuel cell based on the current hydrogen pressure and the hydrogen pressure setting value if the current hydrogen pressure is less than the hydrogen pressure setting value includes: calculating a first difference between the current hydrogen pressure and the minimum hydrogen pressure setting value; calculating a second difference between the hydrogen pressure setting value and the minimum hydrogen pressure setting value; calculating the output current ratio based on the first difference and the second difference; and obtaining the load current based on the output current ratio, the power request value of the upper-level power user, and the minimum preset current of the fuel cell.

[0014] The fuel cell system according to the present invention is briefly described below.

[0015] The fuel cell of the present invention includes a fuel cell and a control module. The control module controls the fuel cell and the control method described above controls the output of the fuel cell. Since the fuel cell of the present invention includes a fuel cell and a control module, the fuel cell can avoid operating under continuous hydrogen deficiency conditions, thereby improving the safety performance of the fuel cell.

[0016] In some embodiments of the present invention, the control module includes: a first module, which acquires the operating status of the upper-level power-consuming object and acquires the hydrogen demand based on the status of the upper-level power-consuming object; a second module, which detects the current actual hydrogen supply of the fuel cell anode; and a third module, which calculates the load current of the fuel cell based on the actual hydrogen supply and the hydrogen demand.

[0017] The following is a brief description of the vehicle according to the present invention.

[0018] The vehicle according to the present invention is equipped with the fuel cell system of the above embodiment. Since the vehicle of the present invention is equipped with the fuel cell system of the above embodiment, when the vehicle is used as the upper-level power user of the fuel cell, the fuel cell can be prevented from working under continuous hydrogen deficiency conditions, thereby improving the safety performance of the fuel cell and the driving safety of the vehicle, and ensuring that the hydrogen pressure on the anode side of the fuel cell is sufficient when the vehicle is in motion.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a flowchart of the control method for a fuel cell system according to the present invention;

[0022] Figure 2 This is a graph showing the hydrogen pressure setting and output current setting of the fuel cell system according to the present invention. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] The following is for reference. Figures 1-2 A control method for a fuel cell system according to an embodiment of the present invention is described.

[0025] The control method for the fuel cell system according to the present invention, such as Figure 1 As shown, the control method includes the following steps:

[0026] S1. Obtain the operating status of the upper-level power-consuming object and determine the hydrogen demand based on that status. First, identify the upper-level power-consuming object. This object can be a vehicle, such as a car, ship, or aircraft, or more specifically, an electric motor in a vehicle, an electric motor in a ship, or other power-generating components. The upper-level power-consuming object can be in an operating or non-operating state. When the upper-level power-consuming object is in an operating state, the hydrogen demand can be calculated by assessing its usage, such as by determining the vehicle's current speed and power. The vehicle's current speed and power can be read via its CAN bus.

[0027] S2, Detect the current actual hydrogen supply at the fuel cell anode. The current actual hydrogen supply at the fuel cell anode can be calculated by detecting the parameters of the current actual hydrogen at the fuel cell anode, such as the current actual hydrogen content, current actual hydrogen density, and current actual hydrogen pressure. After calculating the current hydrogen stoichiometry, the actual hydrogen supply is further derived from the current hydrogen stoichiometry.

[0028] S3. Calculate the fuel cell load current based on the actual hydrogen supply and demand. First, compare the parameters of the actual hydrogen supply and demand to determine if there is a hydrogen shortage at the fuel cell anode. If there is no hydrogen shortage at the fuel cell anode, the preset load current is used as the fuel cell load current. If there is a hydrogen shortage at the fuel cell anode, the maximum current that the fuel cell can provide is used as the fuel cell load current.

[0029] In related technologies, the hydrogen pressure at the anode of existing fuel cells is usually controlled by a solenoid valve. When the fuel cell is used for a long time, the solenoid valve will age, and its ability to control the hydrogen pressure at the anode of the fuel cell will decrease. Therefore, there are problems such as the solenoid valve aging and inability to meet normal pressure control, which leads to insufficient hydrogen pressure on the anode side of the fuel cell, and in severe cases, it can cause hydrogen shortage in the fuel cell.

[0030] In short, according to the fuel cell control method of the present invention, the control method first obtains the hydrogen demand and the current actual hydrogen supply at the fuel cell anode, and then calculates the load current of the fuel cell based on the actual hydrogen supply and the hydrogen demand. Therefore, when the hydrogen pressure on the anode side of the fuel cell is insufficient, the load current of the fuel cell is controlled to avoid the fuel cell from operating under continuous hydrogen shortage conditions, improve the safety performance of the fuel cell, and ensure that the hydrogen pressure on the anode side of the fuel cell is sufficient during the operation of the vehicle.

[0031] In some embodiments of the present invention, obtaining the operating status of the upper-level power-consuming object and determining the hydrogen demand based on the operating status of the upper-level power-consuming object includes the following steps: obtaining the real-time power request of the upper-level power-consuming object; calculating the preset load current of the fuel cell based on the real-time power request; and calculating the hydrogen demand of the fuel cell based on the preset load current. The upper-level power-consuming object can be a motor in a power device such as a vehicle, or other electrical appliances in the power device, or the sum of the motor and other electrical appliances. When the upper-level power-consuming object is a vehicle, the real-time power request of the upper-level power-consuming object can be read through the CAN bus of the vehicle. The preset load current of the fuel cell is then calculated based on the read real-time power of the vehicle. The preset load current can be the load current under the current operating state of the vehicle. The hydrogen demand of the fuel cell is calculated based on the preset load current to obtain the hydrogen demand on the anode side of the fuel cell when the vehicle is in motion.

[0032] In some embodiments of the present invention, obtaining the operating status of a vehicle and determining the hydrogen demand based on that operating status includes the following steps: obtaining the requested power of the upper-level power user; calculating the preset load current of the fuel cell based on the requested power; and calculating the hydrogen demand of the fuel cell based on the preset load current. When the upper-level power user is a vehicle, the requested power can be read through the vehicle's CAN bus. The preset load current of the fuel cell is then calculated based on the read requested power. The preset load current can be the load current under the current operating status of the vehicle. The hydrogen demand of the fuel cell is calculated using the preset load current to obtain the hydrogen demand on the anode side of the fuel cell when the vehicle is in motion.

[0033] In some embodiments of the present invention, detecting the current actual hydrogen supply at the fuel cell anode includes the following steps: obtaining the current hydrogen pressure at the fuel cell anode and calculating the hydrogen supply based on the current hydrogen pressure. It should be explained that after obtaining the current hydrogen pressure at the fuel cell anode, the stoichiometric ratio of the current hydrogen is calculated based on the current hydrogen pressure, and then the actual hydrogen supply is further derived using the current stoichiometric ratio, thereby improving the accuracy of the actual hydrogen supply.

[0034] In some embodiments of the present invention, calculating the fuel cell load current based on the actual hydrogen supply and hydrogen demand includes the following steps: comparing the preset hydrogen supply at the anode with the actual hydrogen supply and obtaining the comparison result; selecting either to output using the preset load current or the maximum current of the fuel cell based on the comparison result. A comparison between the preset hydrogen pressure at the anode and the actual hydrogen pressure is used to determine whether there is a hydrogen shortage at the fuel cell anode. If there is no hydrogen shortage at the fuel cell anode, the preset load current continues to be used as the fuel cell load current; if there is a hydrogen shortage at the fuel cell anode, the maximum current that the fuel cell can currently provide is used as the fuel cell load current.

[0035] In some embodiments of the present invention, if the actual hydrogen supply is greater than the hydrogen demand, the output is based on a preset load current. It is understood that when the actual hydrogen supply is greater than the hydrogen demand, there is no hydrogen shortage at the anode of the fuel cell, and the preset load current continues to be used as the load current of the fuel cell for output. If the actual hydrogen supply is not greater than the hydrogen demand, the output is based on the maximum current. It is understood that when the actual hydrogen supply is less than or equal to the hydrogen demand, there is a hydrogen shortage at the anode of the fuel cell, and the maximum current that the fuel cell can currently provide is used as the load current of the fuel cell.

[0036] In some embodiments of the present invention, the control method further includes: obtaining the power request value of the upper-level power user, calculating a preset load current based on the power request value, determining a hydrogen pressure setting value corresponding to the preset load current based on the preset load current; if the current hydrogen pressure is less than the hydrogen pressure setting value, determining the load current of the fuel cell based on the current hydrogen pressure and the hydrogen pressure setting value.

[0037] In some embodiments of the present invention, the hydrogen pressure setting value can also be a hydrogen pressure setting range. If the current hydrogen pressure falls within the hydrogen pressure range or exceeds the set hydrogen pressure range, the preset load current is determined based on the current hydrogen pressure and the hydrogen pressure setting range.

[0038] like Figure 2 As shown, Figure 2 The curves showing the hydrogen pressure setting and output current setting of the fuel cell according to the present invention can be obtained through multiple experiments or preset according to certain operating conditions. The control method also includes calculating the preset load current 'a' of the upper-level power user based on the power request value of the upper-level power user. The upper-level power user can be a vehicle, and the requested power can be read through the CAN bus of the vehicle.

[0039] like Figure 2As shown in the figure, the curve represents the relationship between the preset load current 'a' of the fuel cell and the hydrogen pressure setting value obtained after testing. By obtaining the power request value of the power user, the preset load current 'a' corresponding to the power request value can be calculated. Furthermore, the hydrogen pressure setting value 'b' corresponding to the preset load current 'a' is determined through the curve. If the current hydrogen pressure 'c' is less than the hydrogen pressure setting value 'b', the load current 'I' of the fuel cell is determined based on the current hydrogen pressure 'c' and the hydrogen pressure setting value 'b'. The load current 'I' of the fuel cell obtained through multiple variables is more accurate, thus improving the accuracy of the fuel cell load current.

[0040] It should be noted that the minimum hydrogen pressure setpoint Smin is in the initial state of the fuel cell, i.e. Figure 2 The starting point of the curve, the hydrogen pressure value when the load current I is 0, can be understood as the hydrogen pressure of the fuel cell starting to increase from the minimum set hydrogen pressure value. Furthermore, the minimum preset current (Omin) of the fuel cell is the value at the initial state of the fuel cell... Figure 2 The starting point of the curve corresponds to the current value at the minimum setpoint of hydrogen pressure, Smin. This current value can be zero or non-zero.

[0041] In some embodiments of the present invention, determining the fuel cell load current based on the actual hydrogen pressure and the hydrogen pressure setting value b includes obtaining a first difference between the current hydrogen pressure c and the minimum hydrogen pressure setting value Smin, i.e., the first difference is c-Smin; obtaining a second difference between the hydrogen pressure setting value b and the minimum hydrogen pressure setting value Smin, i.e., the second difference is b-Smin; and then calculating the output current ratio based on the first and second differences, the output current ratio being (c-Smin) / (b-min). Based on the output current ratio, the current request value of the upper-level power user, and the minimum preset current of the fuel cell (Omin), the fuel cell load current I can be calculated using the formula: I = (c-Smin) / (b-Smin)*(a-Omin) + Omin. It is understood that the fuel cell load current obtained through the above formula is more accurate, thereby avoiding the fuel cell operating under continuously low hydrogen conditions.

[0042] The fuel cell system according to the present invention is briefly described below.

[0043] The fuel cell system according to the present invention includes a fuel cell and a control module. The control module controls the output of the fuel cell according to the above method to prevent the fuel cell from operating under continuous low hydrogen conditions, improve the safety performance of the fuel cell, and ensure sufficient hydrogen pressure on the anode side of the fuel cell when the vehicle is in motion.

[0044] In some embodiments of the present invention, the control module includes a first module, a second module, and a third module. The first module acquires the operating status of the upper-level power-consuming object and obtains the hydrogen demand based on the status of the upper-level power-consuming object. First, it determines the operating status of the upper-level power-consuming object, which can be in a stopped state or an operating state. When the upper-level power-consuming object is in an operating state, the hydrogen demand can be further obtained by acquiring the current power of the upper-level power-consuming object. The upper-level power-consuming object can be a vehicle, and the current speed and current power of the vehicle can be read through the vehicle's CAN bus.

[0045] The second module detects the current actual hydrogen supply at the fuel cell anode. The current actual hydrogen supply at the fuel cell anode can be calculated by detecting the parameters of the current actual hydrogen at the fuel cell anode, such as the current actual hydrogen content, current actual hydrogen density, and current actual hydrogen pressure. After calculating the current hydrogen stoichiometry, the actual hydrogen supply is further derived from the current hydrogen stoichiometry.

[0046] The third module calculates the fuel cell's load current based on the actual hydrogen supply detected by the second module and the hydrogen demand obtained by the first module. It compares the actual hydrogen supply and demand parameters to determine if there is a hydrogen shortage at the fuel cell anode. If there is no hydrogen shortage, the preset load current is used as the fuel cell's load current. If there is a hydrogen shortage, the maximum current that the fuel cell can currently provide is used as the fuel cell's load current.

[0047] The following is a brief description of the vehicle according to the present invention.

[0048] The vehicle according to the present invention is equipped with the fuel cell of the above embodiment. Since the vehicle of the present invention is equipped with the fuel cell of the above embodiment, when the vehicle is used as the upper power user of the fuel cell, the fuel cell can be prevented from working under continuous low hydrogen conditions, thereby improving the safety performance of the fuel cell and the driving safety of the vehicle, and ensuring that the hydrogen pressure on the anode side of the fuel cell is sufficient when the vehicle is in motion.

[0049] To achieve the above embodiments, the present invention also proposes a computer-readable storage medium storing a computer program thereon. When the program is executed by a processor, it can execute a fuel cell control method, the method comprising: acquiring the operating status of an upper-level power-consuming object and acquiring the hydrogen demand based on the operating status of the upper-level power-consuming object; detecting the current actual hydrogen supply at the anode of the fuel cell; and calculating the load current of the fuel cell based on the actual hydrogen supply and the hydrogen demand.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of the invention pertain.

[0053] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0054] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0055] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0056] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0057] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for a fuel cell system, characterized in that, include: Obtain the operating status of the upper-level power-consuming objects and obtain the hydrogen demand based on the operating status of the upper-level power-consuming objects; The current actual hydrogen supply at the anode of the fuel cell is detected; The load current of the fuel cell is calculated based on the actual hydrogen supply and the hydrogen demand. The step of calculating the fuel cell load current based on the actual hydrogen supply and the hydrogen demand includes: obtaining a first difference between the current hydrogen pressure c and the minimum hydrogen pressure setting value Smin, i.e., the first difference is c-Smin; obtaining a second difference between the hydrogen pressure setting value b and the minimum hydrogen pressure setting value Smin, i.e., the second difference is b-Smin; then calculating the output current ratio based on the first difference and the second difference, the output current ratio being (c-Smin) / (b-min); and calculating the fuel cell load current I based on the output current ratio, the current request value of the upper-level power user, and the minimum preset current Omin of the fuel cell, I=(c-Smin) / (b-Smin)*(a-Omin)+Omin, where a is the preset load current.

2. The control method for a fuel cell system according to claim 1, characterized in that, The process of obtaining the operating status of the upper-level power-consuming object and obtaining the hydrogen demand based on the status of the upper-level power-consuming object includes: Obtain the real-time power request from the upper-level power-consuming object; The preset load current of the fuel cell is calculated based on the real-time power request; The hydrogen demand of the fuel cell is calculated based on the preset load current.

3. The control method for a fuel cell system according to claim 1, characterized in that, The detection of the current actual hydrogen supply at the fuel cell anode includes: Obtain the current hydrogen pressure at the anode of the fuel cell, and calculate the actual hydrogen supply based on the current hydrogen pressure.

4. The control method for a fuel cell system according to claim 1, characterized in that, The calculation of the fuel cell load current based on the actual hydrogen supply and the hydrogen demand includes: Compare the preset hydrogen supply at the anode with the actual hydrogen supply and obtain the comparison result; Based on the comparison results, the output can be selected to be either the preset load current or the maximum current of the fuel cell.

5. The control method for a fuel cell system according to claim 1, characterized in that, If the actual hydrogen supply is greater than the hydrogen demand, the output will be based on a preset load current. If the actual hydrogen supply is not greater than the hydrogen demand, the output will be at the maximum current.

6. The control method for a fuel cell system according to claim 2, characterized in that, Also includes: Obtain the power request value of the upper-level power user, calculate the preset load current based on the power request value, and determine the hydrogen pressure setting value corresponding to the preset load current based on the preset load current; If the current hydrogen pressure is less than the hydrogen pressure setting value, the load current of the fuel cell is determined based on the current hydrogen pressure and the hydrogen pressure setting value.

7. The control method for a fuel cell system according to claim 6, characterized in that, If the current hydrogen pressure is less than the set hydrogen pressure value, determining the load current of the fuel cell based on the current hydrogen pressure and the set hydrogen pressure value includes: Calculate the first difference between the current hydrogen pressure and the minimum set value of hydrogen pressure, calculate the second difference between the set value of hydrogen pressure and the minimum set value of hydrogen pressure, calculate the output current ratio based on the first difference and the second difference, and obtain the load current of the fuel cell based on the output current ratio, the power request value of the upper-level power user, and the minimum preset current of the fuel cell.

8. A fuel cell system, characterized in that, include: Fuel cells; A control module that controls the fuel cell and controls the fuel cell output according to any one of claims 1-6.

9. The fuel cell system according to claim 8, characterized in that, The control module includes: The first module obtains the operating status of the upper-level power-consuming object and obtains the hydrogen demand based on the status of the upper-level power-consuming object. The second module detects the current actual hydrogen supply at the anode of the fuel cell. The third module calculates the load current of the fuel cell based on the actual hydrogen supply and the hydrogen demand.

10. A means of transportation, characterized in that, Includes the fuel cell system according to any one of claims 8-9.

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