Fuel cell control method and device and vehicle

Abstract

The invention is suitable for the technical field of vehicles, and provides a fuel cell control method and device and a vehicle. The fuel cell control method comprises the steps that the request power of a whole vehicle, the rated discharge power of a power cell, the peak discharge power of the power cell, the rated charging power of the power cell, the peak charging power of the power cell and the current output power of a fuel cell are obtained; determining a target change slope according to the request power, the rated discharge power, the peak discharge power, the rated charge power, the peak charge power and the current output power; and controlling the current output power of the fuel cell to change according to the target change slope. According to the fuel cell control method, the problems that when the request power of the whole vehicle changes, the power response of the fuel cell is not timely, so that the power response time of the whole vehicle is prolonged, the user feels weak power of the whole vehicle, and the vehicle use experience of the user is affected can be solved.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and in particular, relates to a fuel cell control method, device and vehicle. Background Art

[0002] Fuel cell vehicles are mainly electric-electric hybrid systems composed of fuel cell systems and power battery systems. The power required by the vehicle is provided by the power of the power battery and the fuel cell. When the power required by the vehicle changes, the power response of the fuel cell is not timely, resulting in a longer power response time for the vehicle. Users feel that the power of the vehicle is weak, which affects the user experience. Summary of the invention

[0003] The embodiments of the present application provide a fuel cell control method, device and vehicle, which can solve the problem that when the requested power of the whole vehicle changes, the power response of the fuel cell is not timely, resulting in a longer power response time of the whole vehicle, the user feels that the power of the whole vehicle is weak, and the user's car experience is affected.

[0004] In a first aspect, an embodiment of the present application provides a fuel cell control method, comprising:

[0005] Obtain the requested power of the vehicle, the rated discharge power of the power battery, the peak discharge power of the power battery, the rated charging power of the power battery, the peak charging power of the power battery, and the current output power of the fuel cell;

[0006] determining a target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power;

[0007] The current output power of the fuel cell is controlled to change according to the target change slope.

[0008] In a possible implementation manner of the first aspect, the target change slope includes a first loading slope and a second loading slope, and the second loading slope is greater than the first loading slope;

[0009] The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power includes:

[0010] When the requested power increases and the requested power is less than the sum of the rated discharge power and the current output power, determining the first loading slope to be the target change slope;

[0011] When the requested power increases and the requested power is greater than or equal to the sum of the rated discharge power and the current output power, the second loading slope is determined to be the target change slope.

[0012] In a possible implementation manner of the first aspect, the target change slope further includes a third loading slope, and the third loading slope is greater than the second loading slope;

[0013] The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power further includes:

[0014] When the requested power is greater than or equal to the sum of the rated discharge power and the current output power, the duration of the current output power changing according to the second loading slope is greater than the first preset time, and the parameters of the fuel cell meet the conditions of the third loading slope, the third loading slope is determined to be the target change slope.

[0015] In a possible implementation manner of the first aspect, the target change slope includes a second loading slope and a third loading slope, and the third loading slope is greater than the second loading slope;

[0016] The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power includes:

[0017] When the requested power increases and the requested power is greater than or equal to the sum of the peak discharge power and the current output power, determining the second loading slope to be the target change slope;

[0018] When the requested power is greater than or equal to the sum of the peak discharge power and the current output power, the duration of the current output power changing according to the second loading slope is greater than a second preset time, and the parameters of the fuel cell meet the conditions of the third loading slope, the third loading slope is determined to be the target change slope.

[0019] In a possible implementation manner of the first aspect, the target change slope includes a first load reduction slope and a second load reduction slope, and an absolute value of the second load reduction slope is greater than an absolute value of the first load reduction slope;

[0020] The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power includes:

[0021] When the requested power decreases and the requested power is greater than or equal to zero, determining the first load reduction slope to be the target change slope;

[0022] When the requested power decreases, the requested power is less than zero, and the absolute value of the requested power is less than or equal to the difference between the rated charging power and the current output power, determining the first load reduction slope to be the target change slope;

[0023] When the requested power decreases, the requested power is less than zero, and the absolute value of the requested power is greater than the difference between the rated charging power and the current output power, the second load reduction slope is determined to be the target change slope.

[0024] In a possible implementation manner of the first aspect, the target change slope further includes a third load reduction slope, and an absolute value of the third load reduction slope is greater than an absolute value of the second load reduction slope;

[0025] The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power further includes:

[0026] When the absolute value of the requested power is greater than the difference between the rated charging power and the current output power, the duration of the current output power changing according to the second load reduction slope is greater than a third preset time, and the parameters of the fuel cell meet the conditions of the third load reduction slope, the third load reduction slope is determined to be the target change slope.

[0027] In a possible implementation manner of the first aspect, the target change slope includes a second load reduction slope and a third load reduction slope, and an absolute value of the third load reduction slope is greater than an absolute value of the second load reduction slope;

[0028] The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power includes:

[0029] When the requested power decreases, the requested power is less than zero, and the absolute value of the requested power is greater than the difference between the peak charging power and the current output power, determining the second load reduction slope to be the target change slope;

[0030] When the absolute value of the requested power is greater than the difference between the peak charging power and the current output power, the duration of the current output power changing according to the second load reduction slope is greater than a fourth preset time, and the parameters of the fuel cell meet the conditions of the third load reduction slope, the third load reduction slope is determined to be the target change slope.

[0031] In a possible implementation manner of the first aspect, the method further includes:

[0032] Obtaining parameters of the fuel cell; the parameters of the fuel cell include the AC impedance of the fuel cell and the standard deviation of the single-chip voltage of the fuel cell;

[0033] If the AC impedance is within the first impedance range and the single-chip voltage standard deviation is within the first standard deviation range, it is determined that the fuel cell meets the conditions of the first loading slope, the second loading slope, the first load reduction slope and the second load reduction slope;

[0034] If the AC impedance is within the second impedance range and the single-chip voltage standard deviation is within the second standard deviation range, it is determined that the fuel cell meets the conditions of the first loading slope, the second loading slope, the third loading slope, the first load reduction slope, the second load reduction slope and the third load reduction slope.

[0035] In a second aspect, an embodiment of the present application provides a fuel cell control device, including:

[0036] An acquisition module is used to acquire the requested power of the whole vehicle, the rated discharge power of the power battery, the peak discharge power of the power battery, the rated charging power of the power battery, the peak charging power of the power battery and the current output power of the fuel cell;

[0037] a target change slope determination module, configured to determine a target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power;

[0038] The control module is used to control the current output power of the fuel cell to change according to the target change slope.

[0039] In a third aspect, an embodiment of the present application provides a vehicle, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the methods described in the first aspect when executing the computer program.

[0040] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in any one of the first aspects is implemented.

[0041] In a fifth aspect, an embodiment of the present application provides a computer program product, which, when executed on a vehicle, enables the vehicle to execute any of the methods described in the first aspect.

[0042] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0043] During the driving process, the vehicle first obtains the requested power of the whole vehicle, the rated discharge power of the power battery, the peak discharge power of the power battery, the rated charging power of the power battery, the peak charging power of the power battery and the current output power of the fuel cell. Then, the target change slope is determined according to the requested power, rated discharge power, peak discharge power, rated charging power, peak charging power and current output power. Since the parameters such as the requested power, rated discharge power, peak discharge power, rated charging power, peak charging power and current output power are referred to, the determined target change slope is more in line with the current state of the fuel cell and the whole vehicle. Finally, the current output power of the fuel cell is controlled to change according to the target change slope to meet the timely response of the whole vehicle to the requested power and improve the power of the whole vehicle. At the same time, the fuel cell responds to power with a suitable target change slope, which can also increase the service life of the fuel cell.

[0044] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0046] Figure 1 is a flow chart of a fuel cell control method provided in one embodiment of the present application;

[0047] Figure 2 is a flow chart of a fuel cell control method provided by another embodiment of the present application;

[0048] Figure 3 is a schematic diagram of the structure of a fuel cell control device provided in an embodiment of the present application;

[0049] Figure 4 It is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0051] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0052] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0053] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0054] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0055] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0056] Figure 1 FIG. 1 is a flow chart of a fuel cell control method provided by an embodiment of the present application. Figure 1As shown, the fuel cell control method includes steps S101 to S103.

[0057] Step S101, obtaining the requested power of the whole vehicle, the rated discharge power of the power battery, the peak discharge power of the power battery, the rated charging power of the power battery, the peak charging power of the power battery and the current output power of the fuel cell.

[0058] Specifically, when the vehicle is driving, the requested power of the vehicle is the current power demand of the vehicle. The rated discharge power of the power battery, the peak discharge power of the power battery, the rated charging power of the power battery, and the peak charging power of the power battery are pre-set according to the parameters of the power battery on the vehicle. The current output power can be obtained through the fuel cell controller on the vehicle.

[0059] Step S102, determining a target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power.

[0060] Specifically, the requested power represents the current power demand of the vehicle, the rated discharge power and peak discharge power represent the current discharge capacity of the power battery, the rated charging power and peak charging power represent the current charging capacity of the power battery, and the current output power represents the current output power of the fuel cell. Since the requested power of the vehicle is provided by both the power battery and the fuel cell, by analyzing the requested power, rated discharge power, peak discharge power, rated charging power, peak charging power and current output power, it is possible to analyze how fast the current output power of the fuel cell required by the vehicle changes, thereby determining the appropriate target change slope, which is more in line with the current state of the fuel cell and the vehicle.

[0061] Step S103, controlling the current output power of the fuel cell to change according to the target change slope.

[0062] Specifically, after determining the appropriate target change slope, the current output power of the fuel cell is controlled to change according to the target change slope, so as to meet the timely response of the vehicle to the requested power and improve the power of the vehicle. At the same time, the fuel cell responds to power with an appropriate target change slope, which can also increase the service life of the fuel cell.

[0063] The change slope characterizes the speed at which the current output power of the fuel cell changes. In existing vehicles, when the power request of the entire vehicle changes, the current output power of the fuel cell will change according to the preset change slope. When the requested power of the entire vehicle changes to a larger requested power, the fuel cell still adjusts the current output power with a preset change slope. At this time, the current output power of the fuel cell will take a long time to reach the required power, which will cause the time for the entire vehicle to reach the requested power to become longer, resulting in insufficient vehicle power and reduced user experience. However, this application analyzes the requested power, rated discharge power, peak discharge power, rated charging power, peak charging power and current output power, and determines a target change slope that is more in line with the current state of the vehicle and the fuel cell, so that the current output power of the fuel cell is adjusted to the required power at an appropriate speed, thereby improving the response speed of the entire vehicle to the requested power, improving the power of the entire vehicle, and improving the user experience of the vehicle.

[0064] In some embodiments, the target change slope includes a first loading slope and a second loading slope, and the second loading slope is greater than the first loading slope. Step S102 may include step S1021 and step S1022.

[0065] Step S1021: when the requested power increases and the requested power is less than the sum of the rated discharge power and the current output power, determining the first loading slope as the target change slope.

[0066] Specifically, when the requested power increases, the current output power of the fuel cell needs to increase, and the target change slope determined at this time is the loading slope. When the requested power is less than the sum of the rated discharge power and the current output power, the power battery can quickly increase the output power to meet the requested power of the vehicle. At this time, the current output power of the fuel cell is allowed to increase slowly. Therefore, the smaller first loading slope is determined as the target change slope.

[0067] Step S1022: when the requested power increases and the requested power is greater than or equal to the sum of the rated discharge power and the current output power, determine the second loading slope as the target change slope.

[0068] Specifically, when the requested power increases, the current output power of the fuel cell needs to increase, and the target change slope determined at this time is the loading slope. When the requested power is greater than or equal to the sum of the rated discharge power and the current output power, the power battery cannot quickly increase the output power to meet the requested power of the vehicle, and the current output power of the fuel cell needs to increase rapidly. Therefore, the larger second loading slope is determined as the target change slope.

[0069] In some embodiments, the target change slope further includes a third loading slope, and the third loading slope is greater than the second loading slope. Step S1023 may be further included after step S1022.

[0070] Step S1023, when the requested power is greater than or equal to the sum of the rated discharge power and the current output power, the duration of the current output power changing according to the second loading slope is greater than the first preset time, and the parameters of the fuel cell meet the conditions of the third loading slope, determine that the third loading slope is the target change slope.

[0071] Specifically, after determining that the second loading slope is the target change slope in step S1022, the current output power of the fuel cell is controlled to increase according to the second loading slope, and the fuel cell increases the current output power at a faster rate. If the duration of the current output power changing according to the second loading slope is greater than the first preset time, it means that the fuel cell has not increased the current output power to the required power within the first preset time. At this time, if the parameters of the fuel cell meet the conditions of the third loading slope, the greater third loading slope is determined to be the target change slope. After determining that the third loading slope is the target change slope, the current output power of the fuel cell is controlled to increase according to the third loading slope, and the current output power of the fuel cell will increase at a faster rate, so that the current output power of the fuel cell increases to the required power faster, so that the whole vehicle increases to the requested power more quickly, improves the response speed of the whole vehicle to the requested power, and then improves the power of the whole vehicle and improves the user experience.

[0072] It should be noted that the designer can set the first preset time according to actual needs. For example, the first preset time can be set to 10s, 8s, 7s or other values.

[0073] In some embodiments, the target change slope includes a second loading slope and a third loading slope, and the third loading slope is greater than the second loading slope. Step S102 may further include step 1024 and step S1025.

[0074] Step 1024: when the requested power increases and the requested power is greater than or equal to the sum of the peak discharge power and the current output power, determine the second loading slope as the target change slope.

[0075] Specifically, when the requested power increases, the current output power of the fuel cell needs to increase, and the target change slope determined at this time is the loading slope. When the requested power is greater than or equal to the sum of the peak discharge power and the current output power, it means that even if the discharge power of the power battery reaches the peak discharge power, it cannot meet the power demand of the vehicle. At this time, the current output power of the fuel cell needs to increase rapidly, so the larger second loading slope is determined as the target change slope.

[0076] Step S1025, when the requested power is greater than or equal to the sum of the peak discharge power and the current output power, the duration of the current output power changing according to the second loading slope is greater than the second preset time, and the parameters of the fuel cell meet the conditions of the third loading slope, determine that the third loading slope is the target change slope.

[0077] Specifically, after determining that the second loading slope is the target change slope in step S1024, the current output power of the fuel cell is controlled to increase according to the second loading slope, and the fuel cell increases the current output power at a faster rate. If the duration of the current output power changing according to the second loading slope is greater than the second preset time, it means that the fuel cell has not increased the current output power to the required power within the second preset time. At this time, if the parameters of the fuel cell meet the conditions of the third loading slope, the greater third loading slope is determined to be the target change slope. After determining that the third loading slope is the target change slope, the current output power of the fuel cell is controlled to increase according to the third loading slope, and the current output power of the fuel cell will increase at a faster rate, so that the current output power of the fuel cell increases to the required power faster, so that the whole vehicle increases to the requested power more quickly, improves the response speed of the whole vehicle to the requested power, and then improves the power of the whole vehicle and improves the user experience.

[0078] It should be noted that the designer can set the second preset time according to actual needs. For example, the second preset time can be set to 5s, 4s, 3s or other values.

[0079] In some embodiments, the target change slope includes a first load reduction slope and a second load reduction slope, and the absolute value of the second load reduction slope is greater than the absolute value of the first load reduction slope. Step S102 may further include steps S1026 to S1028.

[0080] Step S1026: when the requested power is reduced and the requested power is greater than or equal to zero, determine the first load reduction slope as the target change slope.

[0081] Specifically, when the requested power is reduced, the current output power of the fuel cell needs to be reduced, and the target change slope determined at this time is the load reduction slope. When the requested power is greater than or equal to zero, it means that the vehicle has no energy recovery demand, and the fuel cell is allowed to reduce the current output power at a slower speed. Therefore, the smaller first load reduction slope is determined as the target change slope.

[0082] Step S1027: when the requested power is reduced, the requested power is less than zero, and the absolute value of the requested power is less than or equal to the difference between the rated charging power and the current output power, determine the first load reduction slope as the target change slope.

[0083] Specifically, when the requested power is reduced, the current output power of the fuel cell needs to be reduced, and the target change slope determined at this time is the load reduction slope. If the requested power is less than zero, it means that the vehicle has an energy recovery demand, that is, the power battery needs to be charged. The requested power at this time is the energy recovery demand power of the vehicle. If the absolute value of the requested power is less than or equal to the difference between the rated charging power and the current output power, it means that the rated charging power of the power battery meets the current power demand of the vehicle. At this time, the current output power of the fuel cell is allowed to decrease slowly, so the smaller first load reduction slope is determined as the target change slope.

[0084] Step S1028: when the requested power is reduced, the requested power is less than zero, and the absolute value of the requested power is greater than the difference between the rated charging power and the current output power, determine the second load reduction slope as the target change slope.

[0085] Specifically, when the requested power is reduced, the current output power of the fuel cell needs to be reduced, and the target change slope determined at this time is the load reduction slope. If the requested power is less than zero, it means that the vehicle has an energy recovery demand, that is, the power battery needs to be charged. The requested power at this time is the energy recovery demand power of the vehicle. If the absolute value of the requested power is greater than the difference between the rated charging power and the current output power, it means that the rated charging power of the power battery does not meet the current power demand of the vehicle. At this time, the current output power of the fuel cell needs to be reduced rapidly, so the larger second load reduction slope is determined as the target change slope.

[0086] In some embodiments, the target change slope further includes a third load reduction slope, and the absolute value of the third load reduction slope is greater than the absolute value of the second load reduction slope. Step S1028 may further include step S1029.

[0087] Step S1029, when the absolute value of the requested power is greater than the difference between the rated charging power and the current output power, the duration of the current output power changing according to the second load reduction slope is greater than the third preset time, and the parameters of the fuel cell meet the conditions of the third load reduction slope, determine that the third load reduction slope is the target change slope.

[0088] Specifically, after determining that the second load reduction slope is the target change slope in step S1028, the current output power of the fuel cell is controlled to decrease according to the second load reduction slope, and the fuel cell reduces the current output power at a faster rate. If the duration of the current output power changing according to the second load reduction slope is greater than the third preset time, it means that the fuel cell has not reduced the current output power to the required power within the third preset time. At this time, if the parameters of the fuel cell meet the conditions of the third load reduction slope, the greater third load reduction slope is determined as the target change slope. When the third load reduction slope is determined to be the target change slope, the current output power of the fuel cell is controlled to decrease according to the third load reduction slope, and the current output power of the fuel cell will decrease at a faster rate, so that the current output power of the fuel cell is reduced to the required power faster, so that the whole vehicle is reduced to the requested power more quickly, the response speed of the whole vehicle to the requested power is improved, and the user experience is improved.

[0089] It should be noted that the designer can set the third preset time according to actual needs. For example, the third preset time can be set to 10s, 8s, 7s or other values.

[0090] In some embodiments, the target change slope includes a second load reduction slope and a third load reduction slope, and the absolute value of the third load reduction slope is greater than the absolute value of the second load reduction slope. Step S102 may include step S10210 and step S10211.

[0091] Step S10210: when the requested power is reduced, the requested power is less than zero, and the absolute value of the requested power is greater than the difference between the peak charging power and the current output power, determine the second load reduction slope as the target change slope.

[0092] Specifically, when the requested power is reduced, the current output power of the fuel cell needs to be reduced, and the target change slope determined at this time is the load reduction slope. If the requested power is less than zero, it means that the vehicle has an energy recovery demand, that is, the power battery needs to be charged. The requested power at this time is the energy recovery demand power of the vehicle. If the absolute value of the requested power is greater than the difference between the peak charging power and the current output power, it means that the peak charging power of the power battery does not meet the current power demand of the vehicle. At this time, the current output power of the fuel cell needs to be reduced rapidly, so the larger second load reduction slope is determined as the target change slope.

[0093] Step S10211, when the absolute value of the requested power is greater than the difference between the peak charging power and the current output power, the duration of the current output power changing according to the second load reduction slope is greater than the fourth preset time, and the parameters of the fuel cell meet the conditions of the third load reduction slope, determine that the third load reduction slope is the target change slope.

[0094] Specifically, after determining that the second load reduction slope is the target change slope in step S10210, the current output power of the fuel cell is controlled to decrease according to the second load reduction slope, and the fuel cell reduces the current output power at a faster rate. If the duration of the current output power changing according to the second load reduction slope is greater than the fourth preset time, it means that the fuel cell still has not reduced the current output power to the required power within the fourth preset time. At this time, if the parameters of the fuel cell meet the conditions of the third load reduction slope, the greater third load reduction slope is determined to be the target change slope. When the third load reduction slope is determined to be the target change slope, the current output power of the fuel cell is controlled to decrease according to the third load reduction slope, and the current output power of the fuel cell will decrease at a faster rate, so that the current output power of the fuel cell is reduced to the required power faster, so that the whole vehicle is reduced to the requested power more quickly, the response speed of the whole vehicle to the requested power is improved, and the user experience is improved.

[0095] It should be noted that the designer may set the fourth preset time according to actual needs. For example, the fourth preset time may be set to 5s, 4s, 3s or other values.

[0096] In some embodiments, Figure 2 As shown, the fuel cell control method further includes steps S201 to S203.

[0097] Step S201, obtaining the parameters of the fuel cell; the parameters of the fuel cell include the AC impedance of the fuel cell and the standard deviation of the single-chip voltage of the fuel cell.

[0098] Specifically, a disturbance current signal is introduced at both ends of the fuel cell through DCDC, wherein the disturbance current signal may include a high-frequency disturbance current signal, a medium-frequency disturbance current signal and a low-frequency disturbance current signal, the high frequency may be about 1000HZ, the medium frequency may be about 500HZ, and the low frequency may be about 10HZ. While the disturbance current signal is loaded on both ends of the fuel cell, the AC component (AC voltage component and AC current component) in the disturbance current signal is collected, and then the AC component is fast Fourier transformed to obtain the impedance phase and amplitude, and finally the AC impedance of the fuel cell is calculated according to the impedance phase and amplitude.

[0099] The single-chip voltage standard deviation of the fuel cell can be directly acquired by the cell voltage monitor (CVM) in the fuel cell system.

[0100] Step S202 , if the AC impedance is within the first impedance range and the single chip voltage standard deviation is within the first standard deviation range, it is determined that the fuel cell meets the conditions of the first loading slope, the second loading slope, the first load reduction slope and the second load reduction slope.

[0101] Specifically, after the AC impedance of the fuel cell and the standard deviation of the single-chip voltage of the fuel cell are determined, the available variation slope of the fuel cell can be determined by judging the values ​​of the AC impedance of the fuel cell and the standard deviation of the single-chip voltage of the fuel cell.

[0102] If the AC impedance is within the first impedance range and the single-chip voltage standard deviation is within the first standard deviation range, it means that the parameters of the fuel cell are within a reasonable range and the performance of the fuel cell is relatively good. At this time, it is determined that the fuel cell meets the conditions of the first loading slope, the second loading slope, the first load reduction slope and the second load reduction slope. At this time, the change slope of the fuel cell includes the first loading slope, the second loading slope, the first load reduction slope and the second load reduction slope.

[0103] Step S203, if the AC impedance is within the second impedance range and the single chip voltage standard deviation is within the second standard deviation range, it is determined that the fuel cell meets the conditions of the first loading slope, the second loading slope, the third loading slope, the first load reduction slope, the second load reduction slope and the third load reduction slope.

[0104] Specifically, if the AC impedance is within the second impedance range and the single-chip voltage standard deviation is within the second standard deviation range, it means that the current parameters of the fuel cell are within a relatively optimal range, the fuel cell performance is very good, and it is determined that the fuel cell meets the first loading slope, the second loading slope, the third loading slope, the first load reduction slope, the second load reduction slope, and the third load reduction slope. At this time, the change slope of the fuel cell includes the first loading slope, the second loading slope, the third loading slope, the first load reduction slope, the second load reduction slope, and the third load reduction slope.

[0105] In some embodiments, the fuel cell control method further includes step S204.

[0106] Step S204: if the AC impedance is within the third impedance range and the single chip voltage standard deviation is within the third standard deviation range, it is determined that the fuel cell meets the conditions of the first loading slope and the first load reduction slope.

[0107] Specifically, if the AC impedance is within the third impedance range and the single chip voltage standard deviation is within the third standard deviation range, it means that the parameters of the fuel cell are unreasonable, the fuel cell is faulty, and the fuel cell needs to be maintained, repaired or replaced.

[0108] It should be noted that the designer can set the first impedance range, the second impedance range, the third impedance range, the first standard deviation range, the second standard deviation range and the third standard deviation range according to the parameters of the fuel cell. The designer can also set the first loading slope, the second loading slope, the third loading slope, the first load reduction slope, the second load reduction slope and the third load reduction slope according to the parameters of the vehicle, the parameters of the power battery and the parameters of the fuel cell.

[0109] Steps S201 to S203 may be performed when the vehicle is started, that is, when the vehicle is started, the determination of the available variation slope of the fuel cell is first completed.

[0110] This application determines the health status of the fuel cell by analyzing the AC impedance of the fuel cell and the standard deviation of the single-chip voltage of the fuel cell, and then determines the available change slope of the fuel cell. The healthier the fuel cell is, the larger the available change slope of the fuel cell is; if the fuel cell is unhealthy, the smaller the available change slope of the fuel cell is. Therefore, when the fuel cell adjusts the current output power, it can choose a suitable change slope to change, prevent the change slope from being too large to damage the fuel cell, and increase the service life of the fuel cell.

[0111] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0112] Figure 3 The structure diagram of the fuel cell control device provided in the embodiment of the present application is shown. Figure 3 As shown, the fuel cell control device includes:

[0113] The acquisition module 31 is used to acquire the requested power of the whole vehicle, the rated discharge power of the power battery, the peak discharge power of the power battery, the rated charging power of the power battery, the peak charging power of the power battery and the current output power of the fuel cell;

[0114] a target change slope determination module 32, configured to determine a target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power;

[0115] The control module 33 is used to control the current output power of the fuel cell to change according to the target change slope.

[0116] In one embodiment of the present application, the target change slope includes a first loading slope and a second loading slope, and the second loading slope is greater than the first loading slope;

[0117] The target change slope determination module 32 is further configured to:

[0118] When the requested power increases and the requested power is less than the sum of the rated discharge power and the current output power, determining the first loading slope to be the target change slope;

[0119] When the requested power increases and the requested power is greater than or equal to the sum of the rated discharge power and the current output power, the second loading slope is determined to be the target change slope.

[0120] In one embodiment of the present application, the target change slope further includes a third loading slope, and the third loading slope is greater than the second loading slope;

[0121] The target change slope determination module 32 is further configured to:

[0122] When the requested power is greater than or equal to the sum of the rated discharge power and the current output power, the duration of the current output power changing according to the second loading slope is greater than the first preset time, and the parameters of the fuel cell meet the conditions of the third loading slope, the third loading slope is determined to be the target change slope.

[0123] In one embodiment of the present application, the target change slope includes a second loading slope and a third loading slope, and the third loading slope is greater than the second loading slope;

[0124] The target change slope determination module 32 is further configured to:

[0125] When the requested power increases and the requested power is greater than or equal to the sum of the peak discharge power and the current output power, determining the second loading slope to be the target change slope;

[0126] When the requested power is greater than or equal to the sum of the peak discharge power and the current output power, the duration of the current output power changing according to the second loading slope is greater than a second preset time, and the parameters of the fuel cell meet the conditions of the third loading slope, the third loading slope is determined to be the target change slope.

[0127] In one embodiment of the present application, the target change slope includes a first load reduction slope and a second load reduction slope, and the absolute value of the second load reduction slope is greater than the absolute value of the first load reduction slope;

[0128] The target change slope determination module 32 is further configured to:

[0129] When the requested power decreases and the requested power is greater than or equal to zero, determining the first load reduction slope to be the target change slope;

[0130] When the requested power decreases, the requested power is less than zero, and the absolute value of the requested power is less than or equal to the difference between the rated charging power and the current output power, determining the first load reduction slope to be the target change slope;

[0131] When the requested power decreases, the requested power is less than zero, and the absolute value of the requested power is greater than the difference between the rated charging power and the current output power, the second load reduction slope is determined to be the target change slope.

[0132] In one embodiment of the present application, the target change slope further includes a third load reduction slope, and the absolute value of the third load reduction slope is greater than the absolute value of the second load reduction slope;

[0133] The target change slope determination module 32 is further configured to:

[0134] When the absolute value of the requested power is greater than the difference between the rated charging power and the current output power, the duration of the current output power changing according to the second load reduction slope is greater than a third preset time, and the parameters of the fuel cell meet the conditions of the third load reduction slope, the third load reduction slope is determined to be the target change slope.

[0135] In one embodiment of the present application, the target change slope includes a second load reduction slope and a third load reduction slope, and the absolute value of the third load reduction slope is greater than the absolute value of the second load reduction slope;

[0136] The target change slope determination module 32 is further configured to:

[0137] When the requested power decreases, the requested power is less than zero, and the absolute value of the requested power is greater than the difference between the peak charging power and the current output power, determining the second load reduction slope to be the target change slope;

[0138] When the absolute value of the requested power is greater than the difference between the peak charging power and the current output power, the duration of the current output power changing according to the second load reduction slope is greater than a fourth preset time, and the parameters of the fuel cell meet the conditions of the third load reduction slope, the third load reduction slope is determined to be the target change slope.

[0139] In one embodiment of the present application, the fuel cell control device further includes:

[0140] A parameter acquisition module, used to acquire the parameters of the fuel cell; the parameters of the fuel cell include the AC impedance of the fuel cell and the standard deviation of the single-chip voltage of the fuel cell;

[0141] A first determination module, configured to determine that the fuel cell satisfies conditions of a first loading slope, a second loading slope, a first load reduction slope, and a second load reduction slope if the AC impedance is within a first impedance range and the single-chip voltage standard deviation is within a first standard deviation range;

[0142] The second determination module is used to determine that the fuel cell meets the conditions of the first loading slope, the second loading slope, the third loading slope, the first load reduction slope, the second load reduction slope and the third load reduction slope if the AC impedance is within the second impedance range and the single-chip voltage standard deviation is within the second standard deviation range.

[0143] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0144] Figure 4 This is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application. Figure 4 As shown, the vehicle 4 of this embodiment may include: at least one processor 40 ( Figure 4 Only one processor 40 is shown in the figure), a memory 41, and a computer program 42 stored in the memory 41 and executable on the at least one processor 40. When the processor 40 executes the computer program 42, the steps in any of the above-mentioned method embodiments are implemented, for example Figure 1 Steps S101 to S103 in the illustrated embodiment. Alternatively, when the processor 40 executes the computer program 42, the functions of each module / unit in the above-mentioned device embodiments are implemented, for example Figure 3 The functions of the modules 31 to 33 are shown.

[0145] Exemplarily, the computer program 42 may be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to complete the present application. The one or more modules / units may be a series of computer program 42 instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program 42 in the vehicle 4.

[0146] The embodiment of the present application further provides a computer-readable storage medium, which stores a computer program 42. When the computer program 42 is executed by the processor 40, the steps in the above-mentioned method embodiments can be implemented.

[0147] An embodiment of the present application provides a computer program product. When the computer program product is run on a vehicle, the vehicle can implement the steps in the above-mentioned method embodiments when the computer program product is executed.

[0148] 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 present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program 42, and the computer program 42 can be stored in a computer-readable storage medium. When the computer program 42 is executed by the processor 40, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program 42 includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device capable of carrying the computer program code to the terminal, a recording medium, a computer memory, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), an electric carrier signal, a telecommunication signal, and a software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0149] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0150] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0151] In the embodiments provided in the present application, it should be understood that the disclosed devices / network equipment and methods can be implemented in other ways. For example, the device / network equipment embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as 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 devices or units, which can be electrical, mechanical or other forms.

[0152] 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 network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0153] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A fuel cell control method, characterized in that: include: Obtain the requested power of the vehicle, the rated discharge power of the power battery, the peak discharge power of the power battery, the rated charging power of the power battery, the peak charging power of the power battery, and the current output power of the fuel cell; determining a target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power; The current output power of the fuel cell is controlled to change according to the target change slope.

2. The fuel cell control method according to claim 1, characterized in that: The target change slope includes a first loading slope and a second loading slope, wherein the second loading slope is greater than the first loading slope; The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power includes: When the requested power increases and the requested power is less than the sum of the rated discharge power and the current output power, determining the first loading slope to be the target change slope; When the requested power increases and the requested power is greater than or equal to the sum of the rated discharge power and the current output power, the second loading slope is determined to be the target change slope.

3. The fuel cell control method according to claim 2, characterized in that: The target change slope further includes a third loading slope, and the third loading slope is greater than the second loading slope; The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power further includes: When the requested power is greater than or equal to the sum of the rated discharge power and the current output power, the duration of the current output power changing according to the second loading slope is greater than the first preset time, and the parameters of the fuel cell meet the conditions of the third loading slope, the third loading slope is determined to be the target change slope.

4. The fuel cell control method according to claim 1, characterized in that: The target change slope includes a second loading slope and a third loading slope, and the third loading slope is greater than the second loading slope; The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power includes: When the requested power increases and the requested power is greater than or equal to the sum of the peak discharge power and the current output power, determining the second loading slope to be the target change slope; When the requested power is greater than or equal to the sum of the peak discharge power and the current output power, the duration of the current output power changing according to the second loading slope is greater than a second preset time, and the parameters of the fuel cell meet the conditions of the third loading slope, the third loading slope is determined to be the target change slope.

5. The fuel cell control method according to claim 1, characterized in that: The target change slope includes a first load reduction slope and a second load reduction slope, and the absolute value of the second load reduction slope is greater than the absolute value of the first load reduction slope; The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power includes: When the requested power decreases and the requested power is greater than or equal to zero, determining the first load reduction slope to be the target change slope; When the requested power decreases, the requested power is less than zero, and the absolute value of the requested power is less than or equal to the difference between the rated charging power and the current output power, determining the first load reduction slope to be the target change slope; When the requested power decreases, the requested power is less than zero, and the absolute value of the requested power is greater than the difference between the rated charging power and the current output power, the second load reduction slope is determined to be the target change slope.

6. The fuel cell control method according to claim 5, characterized in that: The target change slope further includes a third load reduction slope, and an absolute value of the third load reduction slope is greater than an absolute value of the second load reduction slope; The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power further includes: When the absolute value of the requested power is greater than the difference between the rated charging power and the current output power, the duration of the current output power changing according to the second load reduction slope is greater than a third preset time, and the parameters of the fuel cell meet the conditions of the third load reduction slope, the third load reduction slope is determined to be the target change slope.

7. The fuel cell control method according to claim 1, characterized in that: The target change slope includes a second load reduction slope and a third load reduction slope, and the absolute value of the third load reduction slope is greater than the absolute value of the second load reduction slope; The determining the target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power includes: When the requested power decreases, the requested power is less than zero, and the absolute value of the requested power is greater than the difference between the peak charging power and the current output power, determining the second load reduction slope to be the target change slope; When the absolute value of the requested power is greater than the difference between the peak charging power and the current output power, the duration of the current output power changing according to the second load reduction slope is greater than a fourth preset time, and the parameters of the fuel cell meet the conditions of the third load reduction slope, the third load reduction slope is determined to be the target change slope.

8. The fuel cell control method according to any one of claims 1 to 7, characterized in that: The method further comprises: Obtaining parameters of the fuel cell; the parameters of the fuel cell include the AC impedance of the fuel cell and the standard deviation of the single-chip voltage of the fuel cell; If the AC impedance is within the first impedance range and the single-chip voltage standard deviation is within the first standard deviation range, it is determined that the fuel cell meets the conditions of the first loading slope, the second loading slope, the first load reduction slope and the second load reduction slope; If the AC impedance is within the second impedance range and the single-chip voltage standard deviation is within the second standard deviation range, it is determined that the fuel cell meets the conditions of the first loading slope, the second loading slope, the third loading slope, the first load reduction slope, the second load reduction slope and the third load reduction slope.

9. A fuel cell control device, characterized in that: include: An acquisition module is used to acquire the requested power of the whole vehicle, the rated discharge power of the power battery, the peak discharge power of the power battery, the rated charging power of the power battery, the peak charging power of the power battery and the current output power of the fuel cell; a target change slope determination module, configured to determine a target change slope according to the requested power, the rated discharge power, the peak discharge power, the rated charging power, the peak charging power and the current output power; The control module is used to control the current output power of the fuel cell to change according to the target change slope.

10. A vehicle comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 8 is implemented.

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