Fuel cell system power control method and device

Abstract

The invention discloses a fuel cell system power control method and device, and relates to the technical field of fuel cells. The target output power of the DC-DC converter is determined according to the vehicle request power, the target output current of the DC-DC converter is determined according to the target output power and the actual output voltage, and the target output current is amplified when the target output current is higher than the actual output current under the condition that the preset condition is met. When the target output current is lower than the actual output current, the target output current is reduced, so that the current deviation between the amplified or reduced target output current and the current actual output current is higher than the current deviation in the traditional scheme; if so, controlling the speed of changing the actual output current to the target output current to be higher than that of the traditional scheme, namely controlling the speed of changing the actual output power of the fuel cell system to the target output power to be higher than that of the traditional scheme, namely improving the power response speed of the fuel cell system.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a fuel cell system power control method and device. Background Art

[0002] In the fuel cell system, the DC-DC converter is used to convert the low voltage output by the stack into a constant high voltage. Since the output voltage of the DC-DC converter is constant, the power control of the fuel cell system can be achieved by controlling the output current of the DC-DC converter. Changing the output current of the DC-DC converter can change the actual output power of the DC-DC converter, that is, the actual output power of the fuel cell system.

[0003] At present, during the power control of a fuel cell system, the actual output current of the fuel cell system will change toward the target output current, and the speed of change is determined by the current deviation between the actual output current and the target output current. The larger the current deviation, the faster the change speed.

[0004] In the above power control scheme, the current deviation value is small, resulting in the actual output current of the fuel cell system changing slowly toward the target output current, which in turn causes the actual output power of the fuel cell system to change slowly toward the target output power, that is, there is a problem of slow response speed. Summary of the invention

[0005] The present invention solves the technical problem of how to improve the power control response speed of a fuel cell system by providing a fuel cell system power control method and device.

[0006] On the one hand, the present invention provides the following technical solutions:

[0007] A fuel cell system power control method is applied to a fuel cell controller, wherein the fuel cell controller is electrically connected to a vehicle controller, a voltage detection module for detecting an actual output voltage of a DC-DC converter in a fuel cell system, and a current detection module for detecting an actual output current of the DC-DC converter, and the method comprises:

[0008] Acquire the vehicle requested power from the vehicle controller, the actual output voltage from the voltage detection module, and the actual output current from the current detection module;

[0009] Determining a target output power of the DC-DC converter according to the vehicle requested power; the target output power is less than or equal to the vehicle requested power;

[0010] Determining a target output current of the DC-DC converter according to the target output power and the actual output voltage;

[0011] Under the condition that a preset condition is met, the target output current is amplified when the target output current is higher than the actual output current, and the target output current is reduced when the target output current is lower than the actual output current;

[0012] Determine a current deviation between the amplified or reduced target output current and the current actual output current;

[0013] Based on the principle that the speed at which the actual output current changes toward the target output current is positively correlated with the current deviation, the actual output current is controlled to change to the original target output current.

[0014] Optionally, determining the target output power of the DC-DC converter according to the vehicle requested power includes:

[0015] Acquiring operating condition parameters of the fuel cell system, wherein the operating condition parameters include one or more of a coolant inlet temperature, a coolant outlet temperature, an ambient temperature, a power battery charge state, and a fault level;

[0016] Determine the maximum power that the fuel cell system is allowed to output under each of the operating condition parameters;

[0017] The target output power is determined to be a minimum value between the maximum power and the vehicle requested power.

[0018] Optionally, the preset condition includes that a power deviation between an actual output power of the DC-DC converter and the target output power is greater than a preset power threshold;

[0019] After determining the target output current of the DC-DC converter according to the target output power and the actual output voltage and before amplifying the target output current when the target output current is higher than the actual output current and reducing the target output current when the target output current is lower than the actual output current when a preset condition is met, the method further includes:

[0020] Determine the actual output power according to the actual output voltage and the actual output current;

[0021] Determining the power deviation between the actual output power and the target output power;

[0022] Determine the magnitude relationship between the power deviation and the preset power threshold.

[0023] Optionally, the preset condition includes that a flow deviation between a required flow rate of air entering the stack of the fuel cell system and an actual flow rate of air entering the stack is less than a preset flow threshold;

[0024] In the case where the preset condition is met, before amplifying the target output current when the target output current is higher than the actual output current, and reducing the target output current when the target output current is lower than the actual output current, the method further includes:

[0025] Obtaining the required flow rate of air entering the stack and the actual flow rate of air entering the stack;

[0026] Determining the flow rate deviation between the required flow rate of air entering the stack and the actual flow rate of air entering the stack;

[0027] Determine the magnitude relationship between the flow deviation and the preset flow threshold.

[0028] Optionally, after determining the target output current of the DC-DC converter according to the target output power and the actual output voltage and before controlling the actual output current to change to the original target output current based on the principle that the speed of change of the actual output current to the target output current is positively correlated with the current deviation, the method further includes:

[0029] When the preset condition is not met, a current deviation between the original target output current and the actual output current is determined.

[0030] Optionally, amplifying the target output current when the target output current is higher than the actual output current, and reducing the target output current when the target output current is lower than the actual output current, includes:

[0031] When the target output current is higher than the actual output current, the target output current is amplified by a fixed multiple; when the target output current is lower than the actual output current, the target output current is reduced by a fixed multiple.

[0032] Optionally, amplifying the target output current when the target output current is higher than the actual output current, and reducing the target output current when the target output current is lower than the actual output current, includes:

[0033] When the target output current is higher than the actual output current, based on the positive correlation between the amplification factor and the current deviation, the amplification factor corresponding to the current deviation is determined, and the target output current is amplified by the amplification factor;

[0034] When the target output current is lower than the actual output current, based on the negative correlation between the reduction factor and the current deviation, the reduction factor corresponding to the current deviation is determined, and the target output current is reduced by the reduction factor.

[0035] On the other hand, the present invention also provides the following technical solutions:

[0036] A fuel cell system power control device is applied to a fuel cell controller, the fuel cell controller is electrically connected to a vehicle controller, a voltage detection module for detecting the actual output voltage of a DC-DC converter in the fuel cell system, and a current detection module for detecting the actual output current of the DC-DC converter, the device comprising:

[0037] An acquisition module, used to acquire the vehicle requested power from the vehicle controller, the actual output voltage from the voltage detection module, and the actual output current from the current detection module;

[0038] A determination module, configured to determine a target output power of the DC-DC converter according to the vehicle requested power; the target output power is less than or equal to the vehicle requested power;

[0039] and determining a target output current of the DC-DC converter according to the target output power and the actual output voltage;

[0040] an increment module, configured to, when a preset condition is met, amplify the target output current when the target output current is higher than the actual output current, and reduce the target output current when the target output current is lower than the actual output current;

[0041] The determination module is further used to determine a current deviation between the amplified or reduced target output current and the current actual output current;

[0042] The control module is used to control the actual output current to change to the original target output current based on the principle that the speed of change of the actual output current to the target output current is positively correlated with the current deviation.

[0043] On the other hand, the present invention also provides the following technical solutions:

[0044] A vehicle comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any one of the above fuel cell system power control methods.

[0045] On the other hand, the present invention also provides the following technical solutions:

[0046] A computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of any one of the above fuel cell system power control methods.

[0047] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0048] The present invention determines the target output power of the DC-DC converter according to the power requested by the whole vehicle, determines the target output current of the DC-DC converter according to the target output power and the actual output voltage, and when the preset conditions are met, the target output current is amplified when the target output current is higher than the actual output current, and the target output current is reduced when the target output current is lower than the actual output current, so that the current deviation between the amplified or reduced target output current and the current actual output current can be higher than the current deviation in the traditional scheme, and the speed of controlling the actual output current to change to the target output current is higher than that of the traditional scheme, that is, the speed of controlling the actual output power of the fuel cell system to change to the target output power is higher than that of the traditional scheme, that is, the power response speed of the fuel cell system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0050] Figure 1 A partial structural schematic diagram of a fuel cell system in an embodiment of the present invention;

[0051] Figure 2 is a flow chart of a fuel cell system power control method according to an embodiment of the present invention;

[0052] Figure 3 is another flow chart of a fuel cell system power control method according to an embodiment of the present invention;

[0053] Figure 4 Schematic diagram of a fuel cell system power control device in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] The embodiments of the present invention solve the technical problem of how to improve the power control response speed of a fuel cell system by providing a fuel cell system power control method and device.

[0055] In order to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0056] like Figure 1 As shown, the fuel cell system of the embodiment of the present invention includes a vehicle controller, a fuel cell controller, a stack, a DC-DC converter, a voltage detection module and a current detection module. The vehicle controller is electrically connected to the fuel cell controller, and the fuel cell controller is electrically connected to the DC-DC converter, the voltage detection module and the current detection module. The voltage detection module and the current detection module are installed at the output end of the DC-DC converter. In some embodiments, the voltage detection module can be a voltmeter, and the current detection module can be an ammeter.

[0057] Among them, the vehicle controller is used to provide the vehicle request power to the fuel cell controller, the fuel cell controller is used to control the actual output current of the DC-DC converter to control the actual output power of the fuel cell system, the voltage detection module is used to detect the actual output voltage of the DC-DC converter, and the current detection module is used to detect the actual output current of the DC-DC converter.

[0058] The fuel cell system power control method according to the embodiment of the present invention is applied to Figure 1 Fuel cell controllers in Figure 2 As shown, the method includes:

[0059] Step S1, obtaining the vehicle requested power from the vehicle controller, the actual output voltage from the voltage detection module, and the actual output current from the current detection module;

[0060] The vehicle requested power is the power that the vehicle needs the fuel cell system to output; the goal of the fuel cell system power control is to control the actual output power to be close to or reach the vehicle requested power;

[0061] Step S2, determining the target output power of the DC-DC converter according to the vehicle requested power; the target output power is less than or equal to the vehicle requested power;

[0062] The target output power is the power control target of the embodiment of the present invention, that is, the actual output power of the fuel cell system is controlled to be close to or reach the target output power; in some embodiments, the target output power may be the requested power of the whole vehicle;

[0063] Step S3, determining a target output current of the DC-DC converter according to the target output power and the actual output voltage;

[0064] Among them, since the actual output voltage of the DC-DC converter is constant, the target output current = target output power / actual output voltage; controlling the actual output current to reach the target output current can achieve the actual output power reaching the target output power;

[0065] In some implementations, the obtained target output current may be filtered to avoid accumulation of external error factors such as sensor accuracy issues;

[0066] After step S3, the actual output current is controlled to change toward the target output current. Assuming that the target output current is 5 and the actual output current is 1 in the initial state (the current values ​​here and in the following text are only used for illustration and do not represent the actual situation), after the actual output current is controlled to change toward the target output current, the actual output current becomes 2;

[0067] In the traditional scheme, the current deviation is the deviation (absolute value) between the original target output current and the actual output current. The response speed of power control is positively correlated with the current deviation. For example, when the target output current is 5 and the actual output current is 2, the current deviation in the traditional scheme is 3, and the response speed of power control in the traditional scheme is the speed corresponding to "3";

[0068] Step S4, when a preset condition is met, amplifying the target output current when the target output current is higher than the actual output current, and reducing the target output current when the target output current is lower than the actual output current;

[0069] In some embodiments, the preset condition may be unconditional;

[0070] It can be understood that when the target output current is higher than the actual output current, the target output current is amplified, and the current deviation between the amplified target output current and the current actual output current becomes larger. For example, when the target output current is 5 and the actual output current is 2, the target output current is higher than the actual output current, and the target output current can be changed to 1.2 times of the original, that is, the target output current is changed to 6, and the current deviation between the amplified target output current and the current actual output current is 4; when the target output current is lower than the actual output current, the target output current is reduced, and the current deviation between the reduced target output current and the current actual output current becomes smaller;

[0071] Step S5, determining a current deviation between the amplified or reduced target output current and the current actual output current;

[0072] Continuing with the above example, the current deviation between the amplified target output current and the current actual output current is 4, which is larger than the current deviation of "3" in the traditional solution;

[0073] Step S6, based on the principle that the speed at which the actual output current changes toward the target output current is positively correlated with the current deviation, controlling the actual output current to change to the original target output current;

[0074] Since the current deviation in the embodiment of the present invention is greater than the current deviation in the conventional scheme, the speed at which the actual output current is controlled to change toward the target output current is higher than that in the conventional scheme, that is, the speed at which the actual output power of the fuel cell system is controlled to change toward the target output power is higher than that in the conventional scheme, thereby improving the power response speed of the fuel cell system.

[0075] Taking into account that the maximum power allowed to be output by the fuel cell system under different operating conditions is different, there may be a situation where the power requested by the whole vehicle is higher than the maximum power allowed to be output. To ensure that a stable power control target can be obtained, in some embodiments, step S2 may include: obtaining the operating condition parameters of the fuel cell system, the operating condition parameters including one or more of the coolant inlet temperature, the coolant outlet temperature, the ambient temperature, the power battery charge state and the fault level; determining the maximum power allowed to be output by the fuel cell system under each operating condition parameter; determining the target output power as the minimum value between the maximum power and the power requested by the whole vehicle.

[0076] In some embodiments, the operating condition parameters may include the coolant inlet temperature, the coolant outlet temperature, the ambient temperature, the power battery charge state and the fault level, and then determine the maximum power allowed to be output by the fuel cell system at the current coolant inlet temperature, the maximum power allowed to be output by the fuel cell system at the current coolant outlet temperature, the maximum power allowed to be output by the fuel cell system at the current ambient temperature, the maximum power allowed to be output by the fuel cell system at the current power battery charge state and the maximum power allowed to be output by the fuel cell system at the current fault level, and take the minimum value of multiple maximum output powers allowed and the vehicle requested power as the target output power.

[0077] Considering that under normal circumstances, the minimum value among multiple maximum allowed output powers and the vehicle requested power is generally the vehicle requested power, the vehicle requested power may be directly used as the target output power without considering the operating conditions of the fuel cell system.

[0078] Considering that when the power deviation between the actual output power and the target power of the fuel cell system is small, the power control response speed is fast and the probability of power overshoot is high. In order to reduce the probability of power overshoot, steps S4 and S5 can be performed only when the power deviation between the actual output power and the target power of the fuel cell system is large, that is, in some embodiments, the preset condition in step S4 can include that the power deviation between the actual output power of the DC-DC converter and the target output power is greater than a preset power threshold (the power deviation here is an absolute value);

[0079] like Figure 3As shown, after step S3 and before step S4, the fuel cell system power control method may further include: step S7, determining the actual output power according to the actual output voltage and the actual output current, determining the power deviation between the actual output power and the target output power, and judging the magnitude relationship between the power deviation and the preset power threshold;

[0080] After step S7 and before step S6, the fuel cell system power control method may further include: step S8, determining a current deviation between the original target output current and the actual output current when the preset condition is not met.

[0081] The actual output power is the product of the actual output voltage and the actual output current. This is equivalent to executing steps S4 and S5 only when the power deviation between the actual output power and the target power is greater than the preset power threshold, and when the power deviation between the actual output power and the target power is less than or equal to the preset power threshold, the current deviation is the deviation between the original target output current and the actual output current. Power control is performed based on the current deviation between the original target output current and the actual output current, which can reduce the probability of overshoot. In some embodiments, the preset power threshold can be 10kw.

[0082] During the power control process of the fuel cell system, the target output power corresponds to the required air flow rate entering the stack. When the actual output power changes toward the target output power, the actual air flow rate entering the stack needs to change toward the required air flow rate entering the stack. When the power control response speed is fast, the stack consumes air quickly. If the difference between the actual air flow rate entering the stack and the required air flow rate entering the stack is too large, it will cause a gas shortage fault in the stack. In order to reduce the probability of a gas shortage fault in the stack, the power control response speed should not be too fast when the difference between the actual air flow rate entering the stack and the required air flow rate entering the stack is too large. Therefore, in some embodiments, the preset condition may include the flow deviation between the required air flow rate entering the stack and the actual air flow rate entering the stack of the fuel cell system being less than a preset flow threshold;

[0083] Before step S4, the fuel cell system power control method may further include: obtaining the required flow rate of air entering the stack and the actual flow rate of air entering the stack; determining the flow rate deviation between the required flow rate of air entering the stack and the actual flow rate of air entering the stack; judging the magnitude relationship between the flow rate deviation and a preset flow rate threshold;

[0084] After determining the magnitude relationship between the flow deviation and the preset flow threshold and before step S6, the fuel cell system power control method may further include: determining the current deviation between the original target output current and the actual output current when the preset condition is not met.

[0085] The actual flow rate of air entering the stack is generally less than the required flow rate of air entering the stack, so the flow deviation can be the difference obtained by subtracting the actual flow rate of air entering the stack from the required flow rate of air entering the stack. This is equivalent to executing steps S4 and S5 only when the gap between the actual flow rate of air entering the stack and the required flow rate of air entering the stack is small, and improving the response speed of power control. When the gap between the actual flow rate of air entering the stack and the required flow rate of air entering the stack is large, the current deviation is the deviation between the original target output current and the actual output current. Power control is performed based on the current deviation between the original target output current and the actual output current. The response speed of power control is slower, which can reduce the probability of gas shortage failure in the fuel cell stack. In some embodiments, the preset flow threshold can be 20-50L / min.

[0086] In some embodiments, in step S4, amplifying the target output current when the target output current is higher than the actual output current, and reducing the target output current when the target output current is lower than the actual output current, may include: amplifying the target output current by a fixed multiple when the target output current is higher than the actual output current, and reducing the target output current by a fixed multiple when the target output current is lower than the actual output current. For example, amplifying the target output current by 1.2 times when the target output current is higher than the actual output current, and reducing the target output current by 0.9 times when the target output current is lower than the actual output current.

[0087] When the amplification and reduction multiples of the target output current are constant, the constant may be too large or too small. If the current deviation between the original target output current and the actual output current is large and the amplification or reduction multiple is too small, resulting in a small change in the current deviation between the target output current and the actual output current after amplification or reduction, the efficiency of power control will be limited; if the current deviation between the original target output current and the actual output current is small and the amplification or reduction multiple is too large, resulting in an excessive increase in the current deviation between the target output current and the actual output current after amplification or reduction, the probability of power overshoot is high. In order to balance the efficiency of power control and the probability of power overshoot, in some embodiments, in step S4, the target output current is amplified when the target output current is higher than the actual output current, and the target output current is reduced when the target output current is lower than the actual output current, which may include:

[0088] When the target output current is higher than the actual output current, based on the positive correlation between the amplification factor and the current deviation, the amplification factor corresponding to the current deviation is determined, and the target output current is amplified by the amplification factor;

[0089] When the target output current is lower than the actual output current, based on the negative correlation between the reduction factor and the current deviation, the reduction factor corresponding to the current deviation is determined, and the target output current is reduced by the reduction factor.

[0090] In some implementations, the positive correlation between the amplification factor and the current deviation and the negative correlation between the reduction factor and the current deviation may be as shown in Table 1.

[0091] Table 1

[0092]

[0093] Subsequently, the current deviation between the amplified or reduced target output current and the actual output current may be repeatedly calculated and updated, and the target output current may be amplified or reduced according to the amplification or reduction multiple in Table 1, thereby controlling the power response speed.

[0094] like Figure 4 As shown, the embodiment of the present invention also provides a fuel cell system power control device applied to a fuel cell controller, including:

[0095] An acquisition module, used to acquire the vehicle requested power from the vehicle controller, the actual output voltage from the voltage detection module, and the actual output current from the current detection module;

[0096] A determination module, used to determine the target output power of the DC-DC converter according to the vehicle requested power; the target output power is less than or equal to the vehicle requested power;

[0097] and determining a target output current of the DC-DC converter according to the target output power and the actual output voltage;

[0098] An increment module, used to amplify the target output current when the target output current is higher than the actual output current, and to reduce the target output current when the target output current is lower than the actual output current, when a preset condition is met;

[0099] The determination module is also used to determine the current deviation between the amplified or reduced target output current and the current actual output current;

[0100] The control module is used to control the actual output current to change to the original target output current based on the principle that the speed of change of the actual output current to the target output current is positively correlated with the current deviation.

[0101] In some implementations, the determination module may also be used to:

[0102] Obtaining operating condition parameters of the fuel cell system, the operating condition parameters including one or more of coolant inlet temperature, coolant outlet temperature, ambient temperature, power battery charge state, and fault level;

[0103] Determine the maximum power allowed to be output by the fuel cell system under each operating condition parameter;

[0104] The target output power is determined as the minimum value between the maximum power and the vehicle requested power.

[0105] In some embodiments, the preset condition may include that a power deviation between an actual output power of the DC-DC converter and a target output power is greater than a preset power threshold;

[0106] Determine the module, which can also be used to:

[0107] Determine the actual output power according to the actual output voltage and the actual output current;

[0108] Determine the power deviation between the actual output power and the target output power;

[0109] Determine the magnitude relationship between the power deviation and the preset power threshold.

[0110] In some embodiments, the preset condition includes that a flow deviation between a required flow rate of air entering the stack of the fuel cell system and an actual flow rate of air entering the stack is less than a preset flow threshold;

[0111] Determine the module, which can also be used to:

[0112] Obtain the required flow rate of air entering the stack and the actual flow rate of air entering the stack;

[0113] Determine the flow deviation between the required flow rate of air entering the stack and the actual flow rate of air entering the stack;

[0114] Determine the relationship between the flow deviation and the preset flow threshold.

[0115] In some implementations, the determination module may also be used to:

[0116] When the preset condition is not met, a current deviation between the target output current and the actual output current is determined.

[0117] In some implementations, the increment module may be specifically used to:

[0118] When the target output current is higher than the actual output current, the target output current is amplified by a fixed multiple, and when the target output current is lower than the actual output current, the target output current is reduced by a fixed multiple.

[0119] In some implementations, the increment module may be specifically used to:

[0120] When the target output current is higher than the actual output current, based on the positive correlation between the amplification factor and the current deviation, the amplification factor corresponding to the current deviation is determined, and the target output current is amplified by the amplification factor;

[0121] When the target output current is lower than the actual output current, based on the negative correlation between the reduction factor and the current deviation, the reduction factor corresponding to the current deviation is determined, and the target output current is reduced by the reduction factor.

[0122] Based on the same inventive concept as the fuel cell system power control method mentioned above, an embodiment of the present invention also provides a vehicle, including a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement the steps of any one of the fuel cell system power control methods mentioned above.

[0123] Since the computer device introduced in the embodiment of the present invention is a computer device used to implement the fuel cell system power control method in the embodiment of the present invention, based on the fuel cell system power control method introduced in the embodiment of the present invention, the technical personnel in the field can understand the specific implementation of the computer device in the embodiment of the present invention and its various variations, so how the computer device implements the method in the embodiment of the present invention is not described in detail here. As long as the technical personnel in the field implement the computer device used in the fuel cell system power control method in the embodiment of the present invention, it belongs to the scope of protection of the present invention.

[0124] Based on the same inventive concept as the above-mentioned fuel cell system power control method, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-mentioned fuel cell system power control methods.

[0125] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0126] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0127] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0128] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0129] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A fuel cell system power control method, characterized in that: Applied to a fuel cell controller, the fuel cell controller is electrically connected to a vehicle controller, a voltage detection module for detecting an actual output voltage of a DC-DC converter in a fuel cell system, and a current detection module for detecting an actual output current of the DC-DC converter, the method comprising: Acquire the vehicle requested power from the vehicle controller, the actual output voltage from the voltage detection module, and the actual output current from the current detection module; Determining a target output power of the DC-DC converter according to the vehicle requested power; the target output power is less than or equal to the vehicle requested power; Determining a target output current of the DC-DC converter according to the target output power and the actual output voltage; Under the condition that a preset condition is met, the target output current is amplified when the target output current is higher than the actual output current, and the target output current is reduced when the target output current is lower than the actual output current; Determine a current deviation between the amplified or reduced target output current and the current actual output current; Based on the principle that the speed at which the actual output current changes toward the target output current is positively correlated with the current deviation, the actual output current is controlled to change to the original target output current.

2. The fuel cell system power control method according to claim 1, characterized in that: The step of determining the target output power of the DC-DC converter according to the vehicle requested power includes: Acquiring operating condition parameters of the fuel cell system, wherein the operating condition parameters include one or more of a coolant inlet temperature, a coolant outlet temperature, an ambient temperature, a power battery charge state, and a fault level; Determine the maximum power that the fuel cell system is allowed to output under each of the operating condition parameters; The target output power is determined to be a minimum value between the maximum power and the vehicle requested power.

3. The fuel cell system power control method according to claim 1, characterized in that: The preset condition includes that the power deviation between the actual output power of the DC-DC converter and the target output power is greater than a preset power threshold; After determining the target output current of the DC-DC converter according to the target output power and the actual output voltage and before amplifying the target output current when the target output current is higher than the actual output current and reducing the target output current when the target output current is lower than the actual output current when a preset condition is met, the method further includes: Determine the actual output power according to the actual output voltage and the actual output current; Determining the power deviation between the actual output power and the target output power; Determine the magnitude relationship between the power deviation and the preset power threshold.

4. The fuel cell system power control method according to claim 1, characterized in that: The preset condition includes that the flow deviation between the required flow rate of air entering the stack of the fuel cell system and the actual flow rate of air entering the stack is less than a preset flow threshold; In the case where the preset condition is met, before amplifying the target output current when the target output current is higher than the actual output current, and reducing the target output current when the target output current is lower than the actual output current, the method further includes: Obtaining the required flow rate of air entering the stack and the actual flow rate of air entering the stack; Determining the flow rate deviation between the required flow rate of air entering the stack and the actual flow rate of air entering the stack; Determine the magnitude relationship between the flow deviation and the preset flow threshold.

5. The fuel cell system power control method according to claim 3 or 4, characterized in that: After determining the target output current of the DC-DC converter according to the target output power and the actual output voltage and before controlling the actual output current to change to the original target output current based on the principle that the speed of change of the actual output current to the target output current is positively correlated with the current deviation, the method further includes: When the preset condition is not met, a current deviation between the original target output current and the actual output current is determined.

6. The fuel cell system power control method according to claim 1, characterized in that: The step of amplifying the target output current when the target output current is higher than the actual output current, and reducing the target output current when the target output current is lower than the actual output current, comprises: When the target output current is higher than the actual output current, the target output current is amplified by a fixed multiple; when the target output current is lower than the actual output current, the target output current is reduced by a fixed multiple.

7. The fuel cell system power control method according to claim 1, characterized in that: The step of amplifying the target output current when the target output current is higher than the actual output current, and reducing the target output current when the target output current is lower than the actual output current, comprises: When the target output current is higher than the actual output current, determining the amplification factor corresponding to the current deviation based on a positive correlation between the amplification factor and the current deviation, and amplifying the target output current by the amplification factor; When the target output current is lower than the actual output current, the reduction factor corresponding to the current deviation is determined based on a negative correlation between the reduction factor and the current deviation, and the target output current is reduced by the reduction factor.

8. A fuel cell system power control device, characterized in that: Applied to a fuel cell controller, the fuel cell controller is electrically connected to a vehicle controller, a voltage detection module for detecting the actual output voltage of a DC-DC converter in a fuel cell system, and a current detection module for detecting the actual output current of the DC-DC converter, the device comprising: An acquisition module, used to acquire the vehicle requested power from the vehicle controller, the actual output voltage from the voltage detection module, and the actual output current from the current detection module; A determination module, configured to determine a target output power of the DC-DC converter according to the vehicle requested power; the target output power is less than or equal to the vehicle requested power; and determining a target output current of the DC-DC converter according to the target output power and the actual output voltage; an increment module, configured to, when a preset condition is met, amplify the target output current when the target output current is higher than the actual output current, and reduce the target output current when the target output current is lower than the actual output current; The determination module is further used to determine a current deviation between the amplified or reduced target output current and the current actual output current; The control module is used to control the actual output current to change to the original target output current based on the principle that the speed of change of the actual output current to the target output current is positively correlated with the current deviation.

9. A vehicle, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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