Method and device for determining variable load rate of fuel cell of fuel cell vehicle

Abstract

The invention discloses a method and a device for determining a variable load rate of a fuel cell of a fuel cell vehicle. The method comprises the following steps: receiving a power request of the fuel cell vehicle; in response to the power request, obtaining a state of charge (SOC) of a power battery of the fuel cell vehicle; according to the SOC of the power battery, a variable load rate strategy is determined, and the variable load rate strategy comprises the steps that the range of the SOC of the power battery is judged, and whether the loading state of the fuel cell vehicle is considered or not is determined according to the range; setting a target variable load rate of the fuel cell according to the variable load rate strategy; and controlling the fuel cell to change the load at the target load change rate. According to the method and the device, the technical problem that the fuel cell vehicle is easily damaged due to the fact that the fixed variable load rate may not adapt to the current state of the fuel cell vehicle when the power is changed at the fixed variable load rate in response to the power request in the related technology is solved.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell vehicles, and in particular to a method and device for determining a variable load rate of a fuel cell of a fuel cell vehicle. Background Art

[0002] In the fuel cell system, the whole vehicle operates under different working conditions, and the power request stability is different. The fuel cell power request changes frequently, which may reduce the service life of the system. The load is changed according to the established set load change rate based on the power requested by the whole vehicle. At this time, the fuel-electric output power may be constantly changing, resulting in continuous adjustment of the fuel-electric system components, and a lack of consideration and optimization of the durability and response rate of the fuel-electric system.

[0003] Therefore, in the related art, when the power is varied at a fixed varying rate in response to a power request, there is a problem that the fuel cell vehicle may be easily damaged because the fixed varying rate may not be adapted to the current state of the fuel cell vehicle.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] An embodiment of the present invention provides a method and device for determining the load variation rate of a fuel cell of a fuel cell vehicle, so as to at least solve the technical problem in the related art that when the power is varied at a fixed load variation rate in response to a power request, the fixed load variation rate may not be adapted to the current state of the fuel cell vehicle, which may easily cause damage to the fuel cell vehicle.

[0006] According to one aspect of an embodiment of the present invention, a method for determining a load variation rate of a fuel cell of a fuel cell vehicle is provided, comprising: receiving a power request of the fuel cell vehicle; obtaining the state of charge (SOC) of a power battery of the fuel cell vehicle in response to the power request; determining a load variation rate strategy based on the power battery state of charge (SOC), wherein the load variation rate strategy comprises determining a size range of the power battery state of charge (SOC) and determining whether to consider the load state of the fuel cell vehicle based on the size range; setting a target load variation rate of the fuel cell based on the load variation rate strategy; and controlling the fuel cell to vary load at the target load variation rate.

[0007] Optionally, setting the target load varying rate of the fuel cell according to the load varying rate strategy includes: when the judgment result included in the load varying rate strategy is a first judgment result, determining a power variation index and a time variation index corresponding to the power request of the fuel cell, wherein the judgment result is a result of judging whether to use a load signal, and the first judgment result is that the load status of the fuel cell vehicle does not need to be considered; setting the target load varying rate of the fuel cell according to the power variation index and the time variation index.

[0008] Optionally, determining the power change index and time change index corresponding to the power request of the fuel cell includes: acquiring the power corresponding to the power request for the fuel cell at the current moment as a first power, and a second power corresponding to a historical moment before the current moment; determining the absolute value of the power difference between the first power and the second power to obtain the power change index, and determining the time difference between the current moment and the historical moment to obtain the time change index.

[0009] Optionally, the target load variation rate of the fuel cell is set based on the power variation index and the time variation index, including: when the power variation index is greater than a preset power variation threshold and the time variation index is greater than a predetermined time threshold, setting the first load variation rate corresponding to the fuel cell to the target load variation rate.

[0010] Optionally, the target load changing rate of the fuel cell is set based on the power change index and the time change index, including: when the power change index is greater than a preset power change threshold, and the time change index is less than a preset time threshold, and the first load changing rate includes at least one of the following: a first load increase rate, a first load decrease rate, setting the second load changing rate corresponding to the fuel cell to the target load changing rate, wherein the second load changing rate includes at least one of the following: a second load increase rate, a second load decrease rate, the first load increase rate is greater than the second load increase rate, and the first load decrease rate is greater than the second load decrease rate.

[0011] Optionally, setting the target load changing rate of the fuel cell according to the load changing rate strategy includes: when the judgment result included in the load changing rate strategy is a second judgment result, obtaining a load signal of the fuel cell vehicle, wherein the second judgment result is that the load state of the fuel cell vehicle needs to be considered; and setting the target load changing rate of the fuel cell according to the power battery state of charge SOC and the load signal.

[0012] Optionally, setting the target load changing rate of the fuel cell based on the power battery state of charge SOC and the load signal includes at least one of the following: when the power battery state of charge SOC is less than a first threshold value and the load signal is a heavy load signal, setting the third load changing rate corresponding to the fuel cell as the target load changing rate; when the power battery state of charge SOC is less than a first threshold value and the load signal is a light load signal, setting the fourth load changing rate corresponding to the fuel cell as the target load changing rate, wherein, when the third load changing rate includes a third load increase rate and a third load decrease rate, and the fourth load changing rate includes a fourth load increase rate and a fourth load decrease rate, the third load increase rate is greater than the fourth load increase rate, and the third load decrease rate is less than the fourth load decrease rate.

[0013] Optionally, the target load changing rate of the fuel cell is set according to the power battery state of charge SOC and the load signal, including at least one of the following: when the power battery state of charge SOC is greater than a second threshold value, and the load signal is the heavy load signal, and the third load changing rate includes at least one of the following: the third load increase rate, the third load decrease rate, setting the fifth load changing rate corresponding to the fuel cell as the target load changing rate, wherein the fifth load changing rate includes at least one of the following: a fifth load increase rate, a fifth load decrease rate, the fifth load increase rate is less than the third load increase rate, and the fifth load decrease rate is greater than the third load decrease rate; when the power battery state of charge SOC is greater than the second threshold value, and the load signal is the light load signal, and The fourth load varying rate includes at least one of the following: the fourth load increase rate and the fourth load decrease rate, and the sixth load varying rate corresponding to the fuel cell is set as the target load varying rate, wherein, when the fifth load varying rate includes the fifth load increase rate and the fifth load decrease rate, and the sixth load varying rate includes at least one of the following: the sixth load increase rate and the sixth load decrease rate, the sixth load increase rate is less than the fourth load increase rate, and the sixth load decrease rate is greater than the fourth load decrease rate, and when the fifth load varying rate includes the fifth load increase rate and the fifth load decrease rate, and the sixth load varying rate includes the sixth load increase rate and the sixth load decrease rate, the fifth load increase rate is greater than the sixth load increase rate, and the fifth load decrease rate is less than the sixth load decrease rate.

[0014] Optionally, determining the load changing rate strategy based on the power battery state of charge SOC includes at least one of the following: when the power battery state of charge SOC is greater than or equal to a first threshold and less than or equal to a second threshold, determining that the judgment result included in the load changing rate strategy is a first judgment result; when the power battery state of charge SOC is less than the first threshold, determining that the judgment result included in the load changing rate strategy is a second judgment result; when the power battery state of charge SOC is greater than the second threshold, determining that the judgment result included in the load changing rate strategy is the second judgment result.

[0015] According to one aspect of an embodiment of the present invention, a device for determining a load change rate of a fuel cell of a fuel cell vehicle is provided, comprising: a receiving module for receiving a power request of the fuel cell vehicle; an acquisition module for acquiring the state of charge (SOC) of a power battery of the fuel cell vehicle in response to the power request; a determination module for determining a load change rate strategy based on the power battery state of charge (SOC), wherein the load change rate strategy includes determining a size range of the power battery state of charge (SOC) and determining whether to consider the load state of the fuel cell vehicle based on the size range; a setting module for setting a target load change rate of the fuel cell based on the load change rate strategy; and a control module for controlling the fuel cell to change load at the target load change rate.

[0016] According to one aspect of an embodiment of the present invention, an electronic device is provided, comprising: a processor; and a memory for storing requests executable by the processor; wherein the processor is configured to execute the request to implement a method for determining a variable load rate of a fuel cell of a fuel cell vehicle as described in any one of the above.

[0017] According to one aspect of an embodiment of the present invention, a computer-readable storage medium is provided, comprising: when a request in the computer-readable storage medium is executed by a processor of an electronic device, the electronic device is enabled to execute a method for determining a variable load rate of a fuel cell of a fuel cell vehicle as described in any one of the above.

[0018] In an embodiment of the present invention, a power request of a fuel cell vehicle is received; in response to the power request, the state of charge SOC of the power battery of the fuel cell vehicle is obtained; based on the power battery state of charge SOC, a load change rate strategy is determined, wherein the load change rate strategy includes determining the size range of the power battery state of charge SOC and determining whether to consider the load state of the fuel cell vehicle according to the size range; according to the load change rate strategy, a target load change rate of the fuel cell is set; and the fuel cell is controlled to change load at the target load change rate. Since the load change rate strategy is determined based on the power battery state of charge SOC, and the target load change rate of the fuel cell can be further set based on the load change rate strategy, the required power of the fuel cell vehicle can be met, the life of the fuel cell can be extended, and better power performance can be improved, thereby achieving a more optimized operation effect of the fuel cell system, thereby solving the technical problem in the related art that when the power is changed at a fixed load change rate in response to a power request, the fixed load change rate may not be adapted to the current state of the fuel cell vehicle, which may easily cause damage to the fuel cell vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 is a flow chart of a method for determining a variable load rate of a fuel cell of a fuel cell vehicle according to an embodiment of the present invention;

[0021] Figure 2 4 is a structural block diagram of a device for determining a variable load rate of a fuel cell of a fuel cell vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] Example 1

[0025] According to an embodiment of the present invention, an embodiment of a method for determining a variable load rate of a fuel cell of a fuel cell vehicle is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that shown here.

[0026] Figure 1 FIG. 4 is a flow chart of a method for determining a variable load rate of a fuel cell of a fuel cell vehicle according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0027] Step S102, receiving a power request from a fuel cell vehicle;

[0028] In step S102 provided in the present application, the power request may be to require the fuel cell vehicle to travel at a certain speed at a certain power level for a period of time to evaluate its endurance and efficiency. Or in the field of industrial equipment, a power request may be to require the generator to continuously generate electricity at a specific power to verify its output capacity and stability. For example, in a specific application scenario, during the operation of the fuel cell vehicle, the required power of the fuel cell vehicle needs to be adjusted according to different operating conditions.

[0029] Step S104, in response to the power request, obtaining the state of charge SOC of the power battery of the fuel cell vehicle;

[0030] In step S104 provided in the present application, the power battery state of charge SOC can obtain the current power of the target battery through the system or sensor of the fuel cell vehicle, and this value can be expressed as a percentage of the battery, such as 80% power remaining. Obtaining the power battery state of charge SOC can help determine whether charging is needed or considering the endurance.

[0031] It should be noted that the above-mentioned power battery state of charge SOC can be obtained through the battery system controller and other devices. Among them, the power battery state of charge SOC can help determine whether charging is needed, so as to adjust the corresponding strategy during the power load change process. Therefore, obtaining an accurate power battery state of charge SOC is very important for determining the appropriate power load change level and adjusting equipment operation.

[0032] Step S106, determining a load change rate strategy according to the power battery state of charge SOC, wherein the load change rate strategy includes determining a size range of the power battery state of charge SOC and determining whether to consider the load state of the fuel cell vehicle according to the size range;

[0033] In step S106 provided in the present application, the above-mentioned load change rate strategy includes determining the size range of the power battery state of charge SOC and determining whether to consider the load state of the fuel cell vehicle based on the size range. After determining the size range of the power battery state of charge SOC, it is possible to consider whether to use the load state of the fuel cell vehicle. The load state is a load signal, which can be sent by the fuel cell vehicle to the battery system controller. The load signal can be divided into a light load signal of 0 and a heavy load signal of 1. This is not limited here and can be customized according to specific scenarios and applications. That is, in the above steps, based on the power battery state of charge SOC, it can be determined whether to use the heavy load signal in the load change rate strategy, or whether to use the light load signal.

[0034] Step S108, setting a target load changing rate of the fuel cell according to the load changing rate strategy;

[0035] In step S108 provided in the present application, if the above-mentioned load change rate strategy includes the use of a heavy load signal or a light load signal, the output power change of the fuel cell vehicle may change accordingly with the different load signals. At this time, a corresponding target load change rate can be set to meet the requested power of the fuel cell vehicle.

[0036] It should be noted that using a load signal to set the target load rate of the fuel cell according to the load rate strategy can, to a certain extent, improve the stability of the fuel cell system. For example, in the case of a heavy load signal, the load rate can be increased to meet the demand, while in the case of a light load signal, the target load rate can be reduced to reduce fuel consumption, extend the life of the fuel cell, and improve better power performance, thereby achieving a more optimized fuel cell system operation effect.

[0037] Step S110, controlling the fuel cell to perform power load variation at a target load variation rate.

[0038] In step S110 provided in the present application, according to the previously determined target load change rate requirement, the current speed of the fuel cell vehicle is monitored in real time through the speed sensor of the fuel cell or the vehicle management system, and the current speed is compared with the set target load change rate. If the current speed is lower than the target speed, it is necessary to appropriately increase the power output of the fuel cell; if the current speed is higher than the target speed, it is necessary to appropriately reduce the power output of the fuel cell. Through the fuel cell management system, the power output is adjusted so that the fuel cell gradually approaches the target load change rate, and the corresponding power output of the fuel cell vehicle is increased or decreased to achieve the required load change rate adjustment until the fuel cell reaches the set target load change rate.

[0039] It should be noted that when controlling a fuel cell to perform power load variation, it is necessary to consider the endurance and safety of the fuel cell, and make appropriate adjustments and controls based on actual conditions to ensure safe and effective load variation operations.

[0040] Through the above steps S102-S110, a power request of a fuel cell vehicle is received; in response to the power request, the state of charge SOC of the power battery of the fuel cell vehicle is obtained; according to the state of charge SOC of the power battery, a load change rate strategy is determined, wherein the load change rate strategy includes judging the size range of the power battery state of charge SOC and determining whether to consider the load state of the fuel cell vehicle according to the size range; according to the load change rate strategy, a target load change rate of the fuel cell is set; and the fuel cell is controlled to change load at the target load change rate. Since the load change rate strategy is determined according to the power battery state of charge SOC, and according to the load change rate strategy, the target load change rate of the fuel cell can be further set, the required power of the fuel cell vehicle can be met, the life of the fuel cell can be extended, and better power performance can be improved, thereby achieving a more optimized operation effect of the fuel cell system, thereby solving the technical problem in the related art that when the power is changed at a fixed load change rate in response to a power request, the fixed load change rate may not be adapted to the current state of the fuel cell vehicle, which may easily cause damage to the fuel cell vehicle.

[0041] The above method of this embodiment is further introduced below.

[0042] As an optional embodiment, the target load changing rate of the fuel cell is set according to the load changing rate strategy, including: when the judgment result included in the load changing rate strategy is the first judgment result, determining the power change index and time change index corresponding to the power request of the fuel cell, wherein the judgment result is the result of judging whether to use the load signal, and the first judgment result is that the load state of the fuel cell vehicle does not need to be considered; and setting the target load changing rate of the fuel cell according to the power change index and the time change index.

[0043] In this embodiment, the above judgment result is the result of judging whether to use the load signal. When the judgment result included in the above variable load rate strategy is the above first judgment result, the first judgment result is the result that the load signal in the above steps does not need to be used. At this time, only the size range of the state of charge SOC of the power battery of the fuel cell vehicle needs to be considered to further determine the target load rate of the fuel cell.

[0044] The power variation index can be the degree of power variation of a fuel cell vehicle under a given power requirement over time. The power variation index can be evaluated by regularly checking the output power of the fuel cell vehicle. The time variation index can be the change in the requested power of the fuel cell vehicle within a certain period of time under certain conditions of the power battery state of charge SOC of the fuel cell vehicle. The time variation index reflects the degree of change of the power battery state of charge SOC over time under a given power requirement of the fuel cell vehicle. If the time variation index is small, that is, the power battery state of charge SOC changes slowly, then the target load change rate can be relatively high, which means that the fuel cell vehicle can withstand a higher load and maintain a stable power output for a relatively long time. The power variation index and the time variation index in this step are not limited here, and need to be measured and calculated according to the design characteristics and battery performance of the specific fuel cell vehicle.

[0045] It should be noted that the target load change rate of the fuel cell vehicle can be set by comprehensively considering the power change index and the time change index, among which, a smaller power change index and time change index may have lower requirements for the target load change rate, because the power output of the fuel cell vehicle changes less and the power battery state of charge SOC changes more slowly; while a larger power change index and time change index may require a lower target load change rate to stabilize the power output of the fuel cell vehicle and maintain an appropriate power battery state of charge SOC. Therefore, the setting of the power change index and the time change index helps to respond quickly and effectively adjust the target load change rate of the fuel cell vehicle under power request, meet the power change of the fuel cell vehicle, and ensure the normal operation of the fuel cell vehicle.

[0046] As an optional embodiment, determining a power change index and a time change index corresponding to a fuel cell in a fuel cell vehicle includes: obtaining a first power corresponding to the fuel cell at a current moment, and a second power corresponding to a historical moment before the current moment; determining the absolute value of the power difference between the first power and the second power to obtain a power change index, and determining the time difference between the current moment and the historical moment to obtain a time change index.

[0047] In this embodiment, by obtaining a first power corresponding to the fuel cell vehicle at the current moment and a second power corresponding to a historical moment before the current moment, and then determining the absolute value of the difference between the first power and the second power, a power change index is obtained, that is, the power change index reflects the degree of change in the power of the fuel cell vehicle between the current moment and the historical moment. At the same time, the time difference between the current moment and the historical moment is determined to obtain a time change index, that is, the time change index reflects the time when the power of the fuel cell vehicle changes between the current moment and the historical moment.

[0048] It should be noted that by determining the power change index and time change index, the changes in the fuel cell vehicle between the current moment and the historical moment can be effectively evaluated, and to a certain extent can be used to analyze and optimize the performance of the fuel cell vehicle in terms of stability and responsiveness.

[0049] As an optional embodiment, the target load variation rate of the fuel cell is set based on the power variation index and the time variation index, including: when the power variation index is greater than a preset power variation threshold and the time variation index is greater than a predetermined time threshold, setting the first load variation rate corresponding to the fuel cell as the target load variation rate.

[0050] In this embodiment, the settings of the preset power change threshold and the predetermined time threshold can be customized based on specific scenarios and application requirements to reflect the requirements and restrictions on the load change rate.

[0051] According to the power change index and time change index obtained in the above method, it is determined whether the power change index and the time change index reach the corresponding preset thresholds respectively. If the power change index is greater than the preset power change threshold, and the time change index is greater than the preset time threshold, corresponding processing or adjustment is performed, that is, the first load change rate of the fuel cell is set to the preset target load change rate, which can ensure that the control system of the fuel cell vehicle runs at this rate to a certain extent, so that the fuel cell vehicle can travel at the target load change rate.

[0052] It should be noted that by setting appropriate preset power change thresholds and time change thresholds, the system stability, energy efficiency, and system responsiveness can be improved, the equipment can be protected, and a better user experience can be provided. The specific threshold settings should be adjusted according to actual needs and system characteristics, and tested and optimized in actual applications.

[0053] As an optional embodiment, a target load changing rate of the fuel cell is set based on a power change index and a time change index, including: when the power change index is greater than a preset power change threshold and the time change index is less than a preset time threshold, and the first load changing rate includes at least one of the following: a first load increase rate and a first load decrease rate, a second load changing rate corresponding to the fuel cell is set as the target load changing rate, wherein the second load changing rate includes at least one of the following: a second load increase rate and a second load decrease rate, the first load increase rate is greater than the second load increase rate, and the first load decrease rate is greater than the second load decrease rate.

[0054] In this embodiment, according to the preset power change threshold and the preset time threshold obtained in the above method, and the power change index and the time change index obtained, it is judged whether the power change index and the time change index meet the threshold conditions. If the power change index is greater than the preset power change threshold, and the time change index is less than the preset time threshold, then according to the actual situation, the second load change rate corresponding to the fuel cell is set as the target load change rate, wherein the first load change rate in the above steps includes the first load increase rate and the first load decrease rate, and satisfies the first load increase rate greater than the second load increase rate, and the first load decrease rate greater than the second load decrease rate, and according to the actual value of the second load increase rate or the second load decrease rate, the load change rate that the fuel cell needs to reach is set.

[0055] It should be noted that when determining the second load change rate, taking into account the requirements of the power change index and the time change index, it is necessary to ensure that appropriate control and adjustment are carried out according to the actual situation, and according to the real-time power and time changes, ensure that the fuel cell vehicle can travel at the target load change rate and maintain appropriate power output and stable speed. At the same time, the setting of the preset power change threshold and the predetermined time threshold should be evaluated and determined based on the specifications, performance and requirements of the specific application scenarios of the fuel cell vehicle to ensure that the conditions that the first load increase rate is greater than the second load increase rate and the first load reduction rate is greater than the second load reduction rate meet the requirements.

[0056] As an optional embodiment, a target load changing rate of the fuel cell is set according to a load changing rate strategy, including: when the load changing rate strategy includes a second judgment result, obtaining a load signal of the fuel cell vehicle, wherein the second judgment result is that the load state of the fuel cell vehicle needs to be considered; and setting the target load changing rate of the fuel cell according to the power battery state of charge SOC and the load signal.

[0057] Based on the judgment result, the target load change rate of the fuel cell is set, including: when the judgment result is the second judgment result, obtaining the load signal of the fuel cell vehicle, wherein the second judgment result is the result that the load signal needs to be used; based on the power battery state of charge SOC and the load signal, the target load change rate of the fuel cell is set.

[0058] In this embodiment, the above-mentioned load change rate strategy includes the judgment result of the above-mentioned second judgment result, and the second judgment result is the result of needing to use the load signal. For the above-mentioned steps, a series of judgments need to be performed first, which may include the judgment of the load signal to determine the current operating state of the fuel cell vehicle. When the judgment result is the second judgment result, that is, after obtaining the load signal and the state of charge SOC of the power battery, the target load change rate of the fuel cell can be set according to this information. The set target load change rate is to optimize the operation and performance of the fuel cell to meet the needs of the fuel cell vehicle.

[0059] As an optional embodiment, a target load changing rate of the fuel cell is set according to the power battery state of charge SOC and a load signal, including at least one of the following: when the power battery state of charge SOC is less than a first threshold value and the load signal is a heavy load signal, a third load changing rate corresponding to the fuel cell is set as the target load changing rate; when the power battery state of charge SOC is less than a first threshold value and the load signal is a light load signal, a fourth load changing rate corresponding to the fuel cell is set as the target load changing rate, wherein, when the third load changing rate includes a third load increasing rate and a third load decreasing rate, and the fourth load changing rate includes a fourth load increasing rate and a fourth load decreasing rate, the third load increasing rate is less than the fourth load increasing rate, and the third load decreasing rate is greater than the fourth load decreasing rate.

[0060] In this embodiment, the heavy load signal may indicate that the fuel cell vehicle is in a heavy load state. First, in response to the power request, the power battery state of charge SOC and the load signal may be acquired by communicating with the fuel cell vehicle or using a sensor system to acquire real-time data, and further determining whether the power battery state of charge SOC is less than a first threshold value and whether the load signal is light load or heavy load, which is described in two cases:

[0061] 1) When the power battery state of charge SOC is less than the first threshold and the load signal is a heavy load signal, the third load change rate of the fuel cell is set to the target load change rate, wherein the third load change rate includes a third load increase rate and a third load decrease rate. In actual operation, the third load increase rate of the fuel cell can be set based on the above conditions, or the third load decrease rate of the fuel cell can be set to the target load change rate for load change to ensure that the fuel cell vehicle operates at this rate.

[0062] 2) When the power battery state of charge SOC is less than the first threshold and the load signal is a light load signal, the fourth load change rate of the fuel cell is set to the target load change rate, wherein the fourth load change rate includes a fourth load increase rate and a fourth load decrease rate. In actual operation, the fourth load increase rate of the fuel cell can be set based on the above conditions, or the fourth load decrease rate of the fuel cell can be set to the target load change rate for load change to ensure that the fuel cell vehicle operates at this rate.

[0063] It should be noted that, in the above-mentioned heavy load or light load change process, it is necessary to ensure that the third load increase rate is less than the fourth load increase rate, and the third load reduction rate is greater than the fourth load reduction rate. The specific settings of the first threshold and the load signal mentioned above should be evaluated and determined based on the battery capacity, performance indicators and load requirements of the fuel cell vehicle. The determined third load change rate can ensure that the requested power of the fuel cell vehicle is properly controlled and adjusted according to the actual situation, so that the fuel cell vehicle can travel with the fuel cell at a target load change rate of the third load change rate while meeting the power battery state of charge SOC and load signal requirements.

[0064] As an optional embodiment, according to the power battery state of charge SOC and the load signal, the target load change rate of the fuel cell is set, including at least one of the following: when the power battery state of charge SOC is greater than the second threshold, the load signal is a heavy load signal, and the fifth load change rate includes at least one of the following: the fifth load increase rate, the fifth load decrease rate, the fifth load change rate corresponding to the fuel cell is set as the target load change rate, wherein the fifth load change rate includes at least one of the following: the fifth load increase rate, the fifth load decrease rate, the fifth load increase rate is less than the fifth load increase rate, and the fifth load decrease rate is greater than the fifth load decrease rate; when the power battery state of charge SOC is greater than the second threshold, the load signal is a heavy load signal, and the fifth load change rate includes at least one of the following: the fifth load increase rate, the fifth load decrease rate, the fifth load increase rate is less than the fifth load increase rate, and the fifth load decrease rate is greater than the fifth load decrease rate; At the second threshold, the load signal is a light load signal, and the sixth load variation rate includes at least one of the following: a sixth load increase rate and a sixth load decrease rate, the sixth load variation rate corresponding to the fuel cell is set as the target load variation rate, wherein the sixth load variation rate includes at least one of the following: a sixth load increase rate and a sixth load decrease rate, the sixth load increase rate is less than the sixth load increase rate, the sixth load decrease rate is greater than the sixth load decrease rate, and when the fifth load variation rate includes the fifth load increase rate and the fifth load decrease rate, and the sixth load variation rate includes the sixth load increase rate and the sixth load decrease rate, the fifth load increase rate is greater than the sixth load increase rate, and the fifth load decrease rate is less than the sixth load decrease rate.

[0065] In this embodiment, based on the power battery state of charge SOC in the above steps and the load signal, it is determined whether the power battery state of charge SOC is greater than the second threshold, and at the same time, it is determined whether the fuel cell vehicle is in a heavy load state or a light load state, that is, the load signal is considered. For the above steps, the following are explained in different situations:

[0066] 1) When the state of charge SOC of the power battery is greater than the second threshold value and the load signal is a heavy load signal, the fifth load change rate is set as the target load change rate of the fuel cell, wherein the fifth load change rate includes a fifth load increase rate and a fifth load decrease rate. During this process, the fuel cell can be set to change load at the fifth load increase rate or the fifth load decrease rate according to the actual operation of the fuel cell vehicle.

[0067] 2) When the state of charge SOC of the power battery is greater than the second threshold and the load signal is a light load signal, the sixth load change rate is set as the target load change rate of the fuel cell, wherein the sixth load change rate includes a sixth load increase rate and a sixth load decrease rate. During this process, the fuel cell can be set to change load at the sixth load increase rate or the sixth load decrease rate according to the actual operating conditions of the fuel cell vehicle.

[0068] It should be noted that, in the above-mentioned heavy load or light load change process, it is necessary to ensure that the fifth load increase rate is greater than the sixth load increase rate, and the fifth load reduction rate is less than the sixth load reduction rate, and ensure appropriate control and adjustment according to actual conditions, so that the fuel cell vehicle can travel at the target load change rate while meeting the power battery state of charge SOC and load signal requirements, taking into account the changes in the power battery state of charge SOC and load signal as well as the safety and performance limitations of the fuel cell vehicle, and according to actual conditions, the requested power of the fuel cell vehicle is appropriately controlled and adjusted to maintain the stability and consistency of the target load change rate.

[0069] As an optional embodiment, the load change rate strategy is determined according to the power battery state of charge SOC, including at least one of the following: when the power battery state of charge SOC is greater than or equal to a first threshold value and less than or equal to a second threshold value, the judgment result included in the load change rate strategy is determined to be a first judgment result; when the power battery state of charge SOC is less than the first threshold value, the judgment result included in the load change rate strategy is determined to be a second judgment result; when the power battery state of charge SOC is greater than the second threshold value, the judgment result included in the load change rate strategy is determined to be a second judgment result.

[0070] In this embodiment, for the above steps, the state of charge SOC of the power battery of the fuel cell vehicle is first obtained, and according to the value of the state of charge SOC of the power battery, the following judgment is performed to determine the judgment result:

[0071] 1) If the power battery state of charge SOC is greater than or equal to the first threshold and less than or equal to the second threshold, the judgment result included in the load change rate strategy is the first judgment result.

[0072] 2) If the power battery state of charge SOC is less than the first threshold, the judgment result included in the load change rate strategy is the second judgment result.

[0073] 3) If the power battery state of charge SOC is greater than the second threshold, the judgment result included in the load change rate strategy is the second judgment result.

[0074] It should be noted that the above judgment process is based on a pre-set threshold value and the judgment result is determined according to the state of charge SOC of the power battery. Since the judgment result and the setting of the target load change rate are based on actual needs and battery status, fuel cell vehicles can automatically adjust the power output under different load signals and power battery state of charge requirements, which helps to improve transportation efficiency to a certain extent and ensure that fuel cell vehicles can efficiently meet the required power output.

[0075] Based on the above embodiments and optional embodiments, an optional implementation is provided, which is described in detail below.

[0076] In the related art, when the power is varied at a fixed varying rate in response to a power request, there is a technical problem that the fixed varying rate may not be adapted to the current state of the fuel cell vehicle, which may easily cause damage to the fuel cell vehicle.

[0077] In view of this, a method for determining the variable load rate of a fuel cell of a fuel cell vehicle is provided in an optional embodiment of the present invention. The optional embodiment of the present application is described in detail below.

[0078] S1, receiving a power request from a fuel cell vehicle, and in response to the power request, obtaining a state of charge (SOC) of a power battery of the fuel cell vehicle and a load signal of the fuel cell vehicle;

[0079] It should be noted that the above-mentioned power load change request is a power increase request, or a power decrease request, and the load signal of the above-mentioned fuel cell vehicle includes a light load signal and / or a heavy load signal, wherein the fuel cell vehicle sends a load signal to the battery system controller, the light load signal can be 0, and the heavy load signal can be 1.

[0080] S2. When the power battery state of charge SOC is less than the first threshold value of 20% and the load signal is a heavy load signal, the third load change rate corresponding to the fuel cell is set as the target load change rate; when the power battery state of charge SOC is less than the first threshold value of 20% and the load signal is a light load signal, the fourth load change rate corresponding to the fuel cell is set as the target load change rate;

[0081] It should be noted that, when the above-mentioned heavy load signal can be 1, assuming that the power battery state of charge SOC is less than 20%, and when the heavy load signal is 1, the third load change rate corresponding to the fuel cell is set to the target load change rate, wherein the target load change rate may include a load increase rate and / or a load reduction rate, and the third load change rate may include a third load increase rate and / or a third load reduction rate, and the specific process is as follows:

[0082] If the SOC is less than 20% and is overloaded, the impact of the fuel-electric power response on the SOC is given priority, resulting in the risk of further reduction in the battery SOC. Therefore, the third load increase rate can be set to 2.5kw / s to slowly respond to the fuel-electric power under heavy load conditions; at the same time, the third load reduction rate can be reduced to 20kw / s to quickly reduce the fuel-electric power output.

[0083] It should also be noted that, when the above-mentioned light load signal can be 0, assuming that the power battery state of charge SOC is less than 20%, and the light load signal is 0, the fourth load change rate corresponding to the fuel cell is set as the target load change rate, wherein the target load change rate may include a load increase rate and / or a load reduction rate, and the fourth load change rate may include a fourth load increase rate and / or a fourth load reduction rate, and the specific process is as follows:

[0084] If the SOC is less than 20% and the load is light, considering that the power battery's state of charge SOC is low, in order to avoid the risk of slow response to increasing the fuel-electric power, which leads to a further decrease in the power battery SOC, the load increase rate is increased to meet the vehicle's requested power as soon as possible. The fourth load increase rate can be set to 5kw / s. At the same time, the fourth load reduction rate can be reduced to 15kw / s. In this way, slowly reducing the fuel-electric power can also slowly charge the power battery.

[0085] S3. When the power battery state of charge SOC is greater than the second threshold value of 85%, and the load signal is a heavy load signal, the fifth load change rate corresponding to the fuel cell is set to the target load change rate, wherein the fifth load change rate includes at least one of the following: the fifth load increase rate, the fifth load reduction rate, the fifth load increase rate is less than the third load increase rate, and the fifth load reduction rate is greater than the third load reduction rate; when the power battery state of charge SOC is greater than the second threshold value, and the load signal is a light load signal, and the fourth load change rate includes at least one of the following: the fourth load increase rate, the fourth load reduction rate, the fuel cell is set The corresponding sixth load change rate is the target load change rate, wherein, when the fifth load change rate includes the fifth load increase rate, the fifth load decrease rate, and the sixth load change rate includes at least one of the following: the sixth load increase rate and the sixth load decrease rate, the sixth load increase rate is less than the fourth load increase rate, and the sixth load decrease rate is greater than the fourth load decrease rate; when the fifth load change rate includes the fifth load increase rate and the fifth load decrease rate, and the sixth load change rate includes the sixth load increase rate and the sixth load decrease rate, the fifth load increase rate is greater than the sixth load increase rate, and the fifth load decrease rate is less than the sixth load decrease rate;

[0086] It should be noted that, when the above-mentioned heavy load signal can be 1, according to the above-mentioned step, when the power battery state of charge SOC is greater than 85%, and the heavy load signal is 1, the fifth load change rate corresponding to the fuel cell is set as the target load change rate, wherein the fifth load change rate includes a fifth load increase rate and a fifth load decrease rate, and the specific process is as follows:

[0087] If SOC>85% and it is heavily loaded, the power request of the fuel cell increases. In order to meet the required power of the fuel cell, the load increase rate of the fuel cell will increase accordingly. Therefore, the fifth load increase rate can be set to 15kw / s; at the same time, the fifth load reduction rate of the fuel cell can be set to 2.5kw / s to slowly reduce the requested power; if SOC>85% and it is lightly loaded, the power request of the fuel cell is slower. In order to meet the required power of the fuel cell, the load increase rate of the fuel cell will slow down accordingly. Therefore, the sixth load increase rate can be set to 10kw / s. At the same time, the sixth load reduction rate of the fuel cell can be set to 5kw / s to meet the target load change rate of the fuel cell.

[0088] S4, when the power battery state of charge SOC is greater than the first threshold value of 20% and less than the second threshold value of 85%, and the load signal of the fuel cell vehicle is not considered at this time, the power variation index and time variation index of the fuel cell are set;

[0089] It should be noted that when the fuel cell is started, if the requested power changes, the requested power before and after the change and the time of occurrence are recorded, the requested power at the current moment is changed as the first power P_req, the current moment is recorded as t1, the historical moment is t_Last, and the current requested power is set as the second power P_reqLast; the above steps are discussed in different situations below:

[0090] 1) When the power change index is greater than the preset power change threshold, and the time change index is greater than the predetermined time threshold, the power change index satisfies |P_req-P_reqLast|>10kw, and the time change index satisfies (t1-t_Last)>2min, and / or the power change index satisfies |P_req-P_reqLast|>5kw, and the time change index satisfies (t1-t_Last)>5min, then the first load change rate corresponding to the fuel cell is set as the target load change rate, wherein the first load change rate includes a first load increase rate and a first load decrease rate, the first load increase rate may be 5kw / s, and the first load decrease rate may be 10kw / s;

[0091] 2) When the power change index is greater than the preset power change threshold and the time change index is less than the preset time threshold, the power change index satisfies |P_req-P_Last|>5kw, and the time change index satisfies (t1-t_Last)<5min. Because the power change fluctuates frequently, the power request may change again during the adjustment process, and the load can be slowly increased or decreased, that is, the second load change rate corresponding to the fuel cell can be set as the target load change rate, wherein the second load change rate includes at least one of the following: a second load increase rate, a second load decrease rate, the second load increase rate can be 2.5kw / s, and the second load decrease rate can be 5kw / s.

[0092] It should be noted that the second load increase rate can be 2.5kw / s, and the second load reduction rate can be 5kw / s. When the power change index satisfies |P_req-P_reqLast|<5kw and the time change index does not satisfy (t1-t_Last)<5min, the load increase and load decrease rate is 0, and the vehicle power is not responded to temporarily; the requested power of the fuel cell vehicle remains unchanged, and the requested power corresponding to the historical moment t_Last is still the second power.

[0093] S5. When the state of charge SOC of the power battery is in a range where the first threshold value and the second threshold value are different, the fuel cell performs power load change according to the above-mentioned different target load change rates.

[0094] It should be noted that, when the power load variation request is a power increase request, the target load increase rate of the fuel cell is set to the target load variation rate based on the power change index and the time change index; and / or, when the power load variation request is a power load reduction request, the target load reduction rate of the fuel cell is set to the target load variation rate based on the power change index and the time change index.

[0095] Through the above optional implementation, at least the following beneficial effects can be achieved:

[0096] (1) Since the power battery state of charge SOC and load signal are obtained through the battery controller and other equipment in the fuel cell vehicle, and the power and load change rate required by the fuel cell under different operating conditions are also different, the power battery state of charge SOC can help determine whether charging is needed, and the load signal can adjust the corresponding strategy during the power load change process according to the load condition. Therefore, the accuracy of obtaining the power battery state of charge SOC and load signal is very important for setting the appropriate power load change level and adjusting the equipment operation;

[0097] (2) Since the judgment result is the result of whether to use the load signal, it can be determined according to the state of charge SOC of the power battery, and according to the judgment result, the target load change rate of the fuel cell can be further set, that is, according to the judgment result, in the case of high load, the load change rate can be increased to meet the demand, and in the case of light load, the target load change rate can be reduced to reduce fuel consumption, extend the life of the fuel cell, and improve better power performance, thereby achieving a more optimized operation effect of the fuel cell system;

[0098] (3) Since the target load change rate of the fuel cell can be set based on the power change index and the time change index, it can reflect the power change of the fuel cell vehicle at the corresponding moment. Therefore, by setting the power change index and the time change index, it is helpful to respond quickly and effectively adjust the target load change rate of the fuel cell under the power change request to meet the power change of the fuel cell vehicle and ensure the normal operation of the fuel cell vehicle.

[0099] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0100] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present invention.

[0101] Example 2

[0102] According to an embodiment of the present invention, there is also provided a device for implementing the above-mentioned method for determining the variable load rate of a fuel cell of a fuel cell vehicle. Figure 2 is a structural block diagram of a device for determining a variable load rate of a fuel cell of a fuel cell vehicle according to an embodiment of the present invention. Figure 2 As shown, the device includes: a receiving module 202, an acquiring module 204, a determining module 206, a setting module 208 and a controlling module 210. The device is described in detail below.

[0103] A receiving module 202, for receiving a power request from a fuel cell vehicle;

[0104] The acquisition module 204 is connected to the receiving module 202 and is used to obtain the state of charge SOC of the power battery of the fuel cell vehicle in response to the power request;

[0105] The determination module 206 is connected to the acquisition module 204 and is used to determine the load change rate strategy according to the power battery state of charge SOC, wherein the load change rate strategy includes determining the size range of the power battery state of charge SOC and determining whether to consider the load state of the fuel cell vehicle according to the size range;

[0106] The setting module 208 is connected to the determination module 206 and is used to set the target load changing rate of the fuel cell according to the load changing rate strategy;

[0107] The control module 210 is connected to the setting module 208 and is used to control the fuel cell to perform power load variation at a target load variation rate.

[0108] It should be noted here that the device of the above-mentioned method for determining the variable load rate of the fuel cell of the fuel cell vehicle corresponds to steps S102 to S110 in implementing the method for determining the variable load rate of the fuel cell of the fuel cell vehicle, and multiple modules are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the contents disclosed in the above-mentioned embodiment 1.

[0109] Example 3

[0110] According to another aspect of an embodiment of the present invention, there is also provided an electronic device, comprising: a processor; and a memory for storing instructions executable by the processor, wherein the processor is configured to execute instructions to implement any of the above-mentioned methods for determining the variable load rate of a fuel cell of a fuel cell vehicle.

[0111] Example 4

[0112] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is also provided. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device can execute any of the above-mentioned methods for determining the variable load rate of a fuel cell of a fuel cell vehicle.

[0113] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0114] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0115] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0116] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0117] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0118] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0119] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A variable load control method for a fuel cell of a fuel cell vehicle, characterized in that: include: receiving a power request from a fuel cell vehicle; In response to the power request, obtaining a state of charge (SOC) of a power battery of the fuel cell vehicle; Determining a load change rate strategy according to the power battery state of charge SOC, wherein the load change rate strategy includes determining a size range of the power battery state of charge SOC and determining whether to consider the load state of the fuel cell vehicle according to the size range; According to the load changing rate strategy, setting a target load changing rate of the fuel cell; The fuel cell is controlled to change load at the target load changing rate.

2. The method according to claim 1, characterized in that The step of setting a target load changing rate of the fuel cell according to the load changing rate strategy includes: In the case where the load rate strategy includes a first judgment result, determining a power variation index and a time variation index corresponding to the power request of the fuel cell, wherein the judgment result is a result of determining whether to use a load signal, and the first judgment result is that the load state of the fuel cell vehicle does not need to be considered; The target load variation rate of the fuel cell is set according to the power variation index and the time variation index.

3. The method according to claim 2, characterized in that The determining of a power variation index and a time variation index corresponding to a power request of the fuel cell comprises: Acquire a power corresponding to a power request for the fuel cell at a current moment as a first power, and a second power corresponding to a historical moment before the current moment; The absolute value of the power difference between the first power and the second power is determined to obtain the power change index, and the time difference between the current moment and the historical moment is determined to obtain the time change index.

4. The method according to claim 2, characterized in that: The step of setting the target load variation rate of the fuel cell according to the power variation index and the time variation index includes: When the power variation index is greater than a preset power variation threshold, and the time variation index is greater than a predetermined time threshold, the first load variation rate corresponding to the fuel cell is set as the target load variation rate.

5. The method according to claim 4, characterized in that The step of setting the target load variation rate of the fuel cell according to the power variation index and the time variation index includes: When the power change index is greater than a preset power change threshold, and the time change index is less than a preset time threshold, and the first load change rate includes at least one of the following: a first load increase rate and a first load decrease rate, the second load change rate corresponding to the fuel cell is set to the target load change rate, wherein the second load change rate includes at least one of the following: a second load increase rate and a second load decrease rate, the first load increase rate is greater than the second load increase rate, and the first load decrease rate is greater than the second load decrease rate.

6. The method according to claim 1, characterized in that The step of setting a target load changing rate of the fuel cell according to the load changing rate strategy includes: When the load rate strategy includes a second judgment result, obtaining a load signal of the fuel cell vehicle, wherein the second judgment result is that the load state of the fuel cell vehicle needs to be considered; The target load change rate of the fuel cell is set according to the power battery state of charge (SOC) and the load signal.

7. The method according to claim 6, characterized in that The step of setting the target load change rate of the fuel cell according to the power battery state of charge SOC and the load signal includes at least one of the following: When the state of charge SOC of the power battery is less than a first threshold value and the load signal is a heavy load signal, setting a third load change rate corresponding to the fuel cell as the target load change rate; When the state of charge SOC of the power battery is less than the first threshold value and the load signal is a light load signal, the fourth load change rate corresponding to the fuel cell is set as the target load change rate, wherein, when the third load change rate includes a third load increase rate and a third load decrease rate, and the fourth load change rate includes a fourth load increase rate and a fourth load decrease rate, the third load increase rate is greater than the fourth load increase rate, and the third load decrease rate is less than the fourth load decrease rate.

8. The method according to claim 7, characterized in that The step of setting the target load change rate of the fuel cell according to the power battery state of charge SOC and the load signal includes at least one of the following: When the state of charge SOC of the power battery is greater than the second threshold value, and the load signal is the heavy load signal, and the third load changing rate includes at least one of the following: the third load increasing rate and the third load decreasing rate, the fifth load changing rate corresponding to the fuel cell is set as the target load changing rate, wherein the fifth load changing rate includes at least one of the following: the fifth load increasing rate and the fifth load decreasing rate, the fifth load increasing rate is less than the third load increasing rate, and the fifth load decreasing rate is greater than the third load decreasing rate; When the state of charge SOC of the power battery is greater than the second threshold value, and the load signal is the light load signal, and the fourth load variation rate includes at least one of the following: the fourth load increase rate and the fourth load decrease rate, the sixth load variation rate corresponding to the fuel cell is set as the target load variation rate, wherein, when the fifth load variation rate includes the fifth load increase rate and the fifth load decrease rate, and the sixth load variation rate includes at least one of the following: the sixth load increase rate and the sixth load decrease rate, the sixth load increase rate is less than the fourth load increase rate, and the sixth load decrease rate is greater than the fourth load decrease rate, and when the fifth load variation rate includes the fifth load increase rate and the fifth load decrease rate, and the sixth load variation rate includes the sixth load increase rate and the sixth load decrease rate, the fifth load increase rate is greater than the sixth load increase rate, and the fifth load decrease rate is less than the sixth load decrease rate.

9. The method according to any one of claims 1 to 8, characterized in that The step of determining the load change rate strategy according to the power battery state of charge SOC includes at least one of the following: When the state of charge SOC of the power battery is greater than or equal to the first threshold value and less than or equal to the second threshold value, determining that the judgment result included in the load change rate strategy is the first judgment result; When the power battery state of charge SOC is less than the first threshold, determining that the load change rate strategy includes a second judgment result; When the power battery state of charge SOC is greater than the second threshold, it is determined that the judgment result included in the load change rate strategy is the second judgment result.

10. A variable load control device for a fuel cell of a fuel cell vehicle, characterized in that: include: A receiving module, used for receiving a power request of a fuel cell vehicle; An acquisition module, configured to acquire a state of charge (SOC) of a power battery of the fuel cell vehicle in response to the power request; A determination module, configured to determine a load change rate strategy according to the power battery state of charge SOC, wherein the load change rate strategy includes determining a size range of the power battery state of charge SOC and determining whether to consider a load state of the fuel cell vehicle according to the size range; A setting module, used for setting a target load changing rate of the fuel cell according to the load changing rate strategy; The control module is used to control the fuel cell to change load at the target load change rate.

Images