Air system parameter determination method, device, equipment, medium, product and vehicle

Abstract

The invention relates to an air system parameter determination method, device and equipment, a medium, a product and a vehicle, and relates to the technical field of fuel cells. The technical problem that the accuracy of determining the air pressure and the air flow corresponding to the air system of the fuel cell is low in the related technology is at least solved. Comprising the steps that request power, net output power and performance attenuation parameters of a fuel cell are obtained, and the performance attenuation parameters indicate the attenuation degree of the fuel cell; determining an air system reference current request value for the fuel cell based on the request power, the net output power, and the performance degradation parameter; based on the air system reference current request value, the reference flow of the air compressor and the reference pressure of the back pressure valve are determined from a first preset parameter comparison table; based on the reference flow and the reference pressure, air system parameters of the fuel cell are determined, and the air system parameters comprise the required rotating speed of an air compressor and the required opening degree of a back pressure valve. The accuracy of determining the air pressure and the air flow corresponding to the air system can be improved.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a method, device, equipment, medium, product and vehicle for determining air system parameters. Background Art

[0002] With the rapid development and popularization of new energy vehicles, new energy vehicles have become an important means of transportation to achieve sustainable development in the transportation field. Among them, fuel cells are the core components of new energy vehicles. Fuel cells have the advantages of zero emissions, high efficiency, and fast refueling (such as hydrogen) replenishment, and are an important direction for the development of new energy vehicles. The air system corresponding to the fuel cell, as the "lungs" of the fuel cell, is mainly used to provide sufficient air (oxygen) for the fuel cell when the fuel cell is running to ensure the normal operation of the fuel cell. In the power closed-loop control of the fuel cell, the air flow and air pressure of the air system during operation are mainly determined according to the current feedback from the fuel cell, and then the air system adopts PID control to achieve control and regulation of air pressure and air flow.

[0003] In the related art, the initial value of the air inlet flow and the initial value of the air inlet pressure can be calculated according to the power offset required by the driver, and then the altitude temperature compensation coefficient can be calculated according to the ambient air pressure and temperature. Thus, the final target air inlet flow is calculated according to the initial value of the air inlet flow and the altitude temperature compensation coefficient, and the final target air inlet pressure is calculated according to the initial value of the air inlet pressure and the altitude temperature compensation coefficient. Finally, the air compressor speed request correction value and the throttle opening request correction value are calculated in combination with the actual air inlet flow and the actual inlet pressure. This technical solution mainly calculates the correction values ​​of the air compressor speed and the throttle opening by considering parameters such as the required power offset, ambient air pressure, and temperature compensation coefficient. These parameters are basic parameters related to the air system of the fuel cell. In addition, there are some other parameters that will affect the operation of the air system of the fuel cell, thereby affecting the operating power of the fuel cell. Therefore, the accuracy of the scheme in determining the relevant parameters of the air system of the fuel cell is low.

[0004] In another related technology, the voltage signal can be converted into a time series by preprocessing various historical detection signals, output voltage signals, and battery polarization curves of each time period of the fuel cell, and the unreasonable signals in the time series and polarization curves can be eliminated to obtain the final voltage series and multiple polarization curves. Then, a fuel cell aging model is established, and the polarization curve is input into the genetic algorithm to identify the initial parameters. The aging life of the remaining sequence is predicted by combining the aging model and the particle filter method. This technical solution is mainly to accurately predict the remaining life of fuel cells that work for a long period of time online to ensure the long-term safety and stability of the system, and cannot determine the relevant parameters of the fuel cell's air system. Summary of the invention

[0005] The present application provides a method, device, equipment, medium, product and vehicle for determining air system parameters. The purpose of the present application is to at least solve the technical problem of low accuracy in determining the air pressure and air flow corresponding to the air system of a fuel cell in the related art.

[0006] In order to achieve the above purpose, the technical solution adopted in this application is as follows:

[0007] According to the first aspect provided by the present application, a method for determining air system parameters is provided, the method comprising: obtaining a requested power, a net output power and a performance attenuation parameter of a fuel cell, the performance attenuation parameter being used to indicate the attenuation degree of the fuel cell; determining an air system reference current request value of the fuel cell based on the requested power, the net output power and the performance attenuation parameter; determining a reference flow of an air compressor and a reference pressure of a back pressure valve from a first preset parameter comparison table based on the air system reference current request value, the first preset parameter comparison table including reference flows and reference pressures corresponding to different air system reference current request values; determining air system parameters of the fuel cell based on the reference flow and the reference pressure, the air system parameters including a required speed of the air compressor and a required opening of the back pressure valve, the required speed being used to control the flow of the air compressor, and the required opening being used to control the pressure of the back pressure valve.

[0008] According to the above technical means, the present application can determine the air system reference current request value of the fuel cell based on the requested power, net output power and performance attenuation parameters of the fuel cell. Since the performance attenuation parameter is used to indicate the attenuation degree of the fuel cell, the determined air system reference current request value is a parameter after considering the attenuation degree of the fuel cell. In this way, based on the air system reference current request value, the accurate reference flow of the air compressor and the reference pressure of the back pressure valve can be determined from the first preset parameter comparison table. Then, based on the reference flow and reference pressure, the required speed of the air compressor and the required opening of the back pressure valve are determined to control the flow of the air compressor and the pressure of the back pressure valve. Based on this scheme, the requested power and net output power of the fuel cell can be comprehensively considered, and further combined with the attenuation degree of the fuel cell, the accurate required speed of the air compressor and the required opening of the back pressure valve can be determined, so as to accurately control the air system parameters of the fuel cell and improve the stability of the air system operation.

[0009] In a possible implementation, the above-mentioned determination of the air system reference current request value of the fuel cell based on the requested power, the net output power and the performance attenuation parameter includes: determining the difference between the requested power and the net output power as the error power of the fuel cell; determining the input current of the DCDC converter based on the error power; and determining the air system reference current request value based on the input current of the DCDC converter and the performance attenuation parameter.

[0010] According to the above technical means, the present application can first determine the error power of the fuel cell based on the difference between the requested power and the net output power, and then determine the input current of the DCDC converter based on the error power. In this way, when determining the input current of the DCDC converter, the error power of the fuel cell is taken into account, and the accuracy of the input current of the determined DCDC converter is improved. Therefore, based on the input current of the DCDC converter, combined with the performance attenuation parameters, the required speed of the air compressor and the required opening of the back pressure valve can be further accurately determined, thereby accurately controlling the air system parameters of the fuel cell and improving the stability of the air system operation.

[0011] In a possible implementation, the above-mentioned determination of the air system reference current request value based on the input current and performance attenuation parameters of the DCDC converter includes: determining the current regulation coefficient through a fuzzy controller based on the input current and performance attenuation parameters of the DCDC converter; determining the product of the current regulation coefficient and the performance attenuation parameter as the regulated current; and determining the sum of the input current and the regulated current of the DCDC converter as the air system reference current request value.

[0012] According to the above technical means, the present application can first determine the current regulation coefficient through a fuzzy controller based on the input current and performance attenuation parameters of the DCDC converter. In this way, the regulated current can be determined by multiplying the current regulation coefficient and the performance attenuation parameter. It can be understood that the regulated current is determined based on the attenuation degree and error power of the fuel cell. In this way, by comprehensively considering the influence of various parameters of the fuel cell on the output current of the stack, the sum of the input current of the DCDC converter and the regulated current is determined as the reference current request value of the air system, and a more accurate reference flow of the air compressor and the reference pressure of the back pressure valve can be obtained.

[0013] In a possible implementation, the above-mentioned determination of the air system parameters of the fuel cell based on the reference flow and the reference pressure includes: determining a reference speed and a reference opening from a second preset parameter comparison table based on the reference flow and the reference pressure, the second preset parameter comparison table including reference speeds corresponding to different reference flow rates and reference openings corresponding to different reference pressures; based on the reference speed and the reference opening, determining the required speed of the air compressor and the required opening of the back pressure valve by a preset algorithm.

[0014] According to the above technical means, the present application can determine the reference speed corresponding to the reference flow rate and the reference opening corresponding to the reference pressure from the second preset parameter comparison table. Then, based on the reference speed and reference opening, the required speed of the air compressor and the required opening of the back pressure valve can be determined by a preset algorithm. In this way, the required speed and required opening are determined after comprehensively considering the attenuation degree and error power of the fuel cell. The determined required speed and required opening are more accurate and more in line with the actual operating conditions of the fuel cell.

[0015] In a possible embodiment, the above method also includes: determining at least one set of operating data corresponding to each preset power value in multiple preset power values ​​from multiple sets of operating data of the fuel cell, each set of operating data including: the net output power of the fuel cell, the stack current and the stack voltage; for any preset power value in the multiple preset power values, based on the coordinate points of at least one set of operating data corresponding to any preset power value in the preset coordinate system, determining the center coordinate point corresponding to any preset power value in the preset coordinate system; connecting the center coordinate points corresponding to each preset power value in the multiple preset power values ​​in the preset coordinate system in sequence to obtain a target performance curve, so as to represent the current performance information of the fuel cell through the target performance curve; based on the current performance information, the first performance information and the second performance information, determining the performance attenuation parameters of the fuel cell, the first performance information being the performance information when the fuel cell is not attenuated, and the second performance information being the performance information when the attenuation degree of the fuel cell is the preset attenuation degree.

[0016] According to the above technical means, the present application can determine at least one set of operating data corresponding to each preset power value from multiple sets of operating data based on multiple preset power values. Then, based on the coordinate points of at least one set of operating data corresponding to each preset power value in the preset coordinate system, determine the center coordinate point corresponding to each preset power value in the preset coordinate system. In this way, based on the connection line of the center coordinate point corresponding to each preset power value in the preset coordinate system among the multiple preset power values, the target performance curve corresponding to the fuel cell can be determined. Since the fuel cell has different performance information when it produces different degrees of attenuation, and the performance information of the fuel cell can be accurately determined based on the operating data of the fuel cell. Therefore, based on the current performance information of the fuel cell represented by the target performance curve, combined with the first performance information when the fuel cell is not attenuated, and the second performance information when the attenuation degree of the fuel cell is the preset attenuation degree, the current attenuation degree of the fuel cell can be determined to accurately evaluate the performance attenuation parameters of the fuel cell.

[0017] In a possible implementation, the above-mentioned determination of the performance attenuation parameters of the fuel cell based on the current performance information, the first performance information, and the second performance information includes: determining the area of ​​a first closed area formed by the target performance curve and the first performance curve, and the area of ​​a second closed area formed by the first performance curve and the second performance curve, the first performance curve representing the first performance information, and the second performance curve representing the second performance information; based on the area of ​​the first closed area and the area of ​​the second closed area, determining the performance attenuation parameters of the fuel cell.

[0018] According to the above-mentioned technical means, the present application can determine the corresponding performance curve of the fuel cell when it produces different degrees of attenuation, specifically based on the area of ​​the closed area formed between the corresponding performance curves, and intuitively and accurately determine the performance attenuation parameters of the fuel cell, thereby improving the accuracy of determining the performance attenuation parameters of the fuel cell through specific coordinate information.

[0019] In a possible implementation, the above-mentioned determining at least one group of operating data corresponding to each preset power value in multiple preset power values ​​from multiple groups of operating data of the fuel cell includes: for any preset power value in the multiple preset power values, determining a power range corresponding to any preset power value; determining at least one group of operating data in the multiple groups of operating data whose net output power is in the power range corresponding to any preset power value as at least one group of operating data corresponding to any preset power value.

[0020] According to the above technical means, the present application can first determine the power interval corresponding to each preset power value, and then determine at least one set of operating data corresponding to each preset power value based on the power interval of the net output power included in each set of operating data in the multiple sets of operating data. In this way, at least one set of operating data corresponding to each preset power value can be accurately determined, thereby improving the accuracy of the subsequent determination of the target performance curve corresponding to the fuel cell.

[0021] According to the second aspect provided by the present application, an air system parameter determination device is provided, and the air system parameter determination device includes: an acquisition module and a processing module; the acquisition module is used to acquire the requested power, net output power and performance attenuation parameters of the fuel cell, and the performance attenuation parameters are used to indicate the attenuation degree of the fuel cell; the processing module is used to determine the air system reference current request value of the fuel cell based on the requested power, net output power and performance attenuation parameters; the processing module is also used to determine the reference flow of the air compressor and the reference pressure of the back pressure valve from a first preset parameter comparison table based on the air system reference current request value, and the first preset parameter comparison table includes reference flows and reference pressures corresponding to different air system reference current request values; the processing module is also used to determine the air system parameters of the fuel cell based on the reference flow and reference pressure, and the air system parameters include the required speed of the air compressor and the required opening of the back pressure valve, the required speed is used to control the flow of the air compressor, and the required opening is used to control the pressure of the back pressure valve.

[0022] In one possible implementation, the processing module is specifically used to determine the difference between the requested power and the net output power as the error power of the fuel cell; the processing module is specifically used to determine the input current of the DCDC converter based on the error power; the processing module is specifically used to determine the air system reference current request value based on the input current and performance attenuation parameters of the DCDC converter.

[0023] In one possible implementation, the processing module is specifically used to determine the current regulation coefficient through a fuzzy controller based on the input current and performance attenuation parameter of the DCDC converter; the processing module is specifically used to determine the product of the current regulation coefficient and the performance attenuation parameter as the regulation current; the processing module is specifically used to determine the sum of the input current of the DCDC converter and the regulation current as the air system reference current request value.

[0024] In one possible implementation, the processing module is specifically used to determine a reference speed and a reference opening from a second preset parameter comparison table based on a reference flow and a reference pressure, wherein the second preset parameter comparison table includes reference speeds corresponding to different reference flow rates and reference openings corresponding to different reference pressures; the processing module is specifically used to determine the required speed of the air compressor and the required opening of the back pressure valve through a preset algorithm based on the reference speed and the reference opening.

[0025] In a possible embodiment, the processing module is also used to determine at least one set of operating data corresponding to each of multiple preset power values ​​from multiple sets of operating data of the fuel cell, and each set of operating data includes: the net output power of the fuel cell, the stack current and the stack voltage; the processing module is also used to determine, for any one of the multiple preset power values, the center coordinate point corresponding to any preset power value in the preset coordinate system based on the coordinate point of at least one set of operating data corresponding to any preset power value in the preset coordinate system; the processing module is also used to connect the center coordinate points corresponding to each of the multiple preset power values ​​in the preset coordinate system in sequence to obtain a target performance curve, so as to represent the current performance information of the fuel cell through the target performance curve; the processing module is also used to determine the performance attenuation parameter of the fuel cell based on the current performance information, the first performance information and the second performance information, the first performance information being the performance information when the fuel cell is not attenuated, and the second performance information being the performance information when the attenuation degree of the fuel cell is the preset attenuation degree.

[0026] In one possible embodiment, the processing module is specifically used to determine the area of ​​a first closed area formed by a target performance curve and a first performance curve, and the area of ​​a second closed area formed by the first performance curve and a second performance curve, the first performance curve represents first performance information, and the second performance curve represents second performance information; the processing module is specifically used to determine the performance attenuation parameter of the fuel cell based on the area of ​​the first closed area and the area of ​​the second closed area.

[0027] In one possible implementation, the processing module is specifically used to determine, for any one of a plurality of preset power values, a power interval corresponding to any one of the preset power values; the processing module is specifically used to determine, among a plurality of sets of operating data, at least one set of operating data in which the net output power is in the power interval corresponding to any one of the preset power values ​​as at least one set of operating data corresponding to any one of the preset power values.

[0028] According to the third aspect provided by the present application, an electronic device is provided, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to execute instructions to implement the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0029] According to the fourth aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation method thereof.

[0030] According to the fifth aspect provided by the present application, a computer program product is provided, the computer program product comprising computer instructions, and when the computer instructions are executed on an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0031] According to a sixth aspect provided by the present application, a vehicle is provided, the vehicle comprising an air system parameter determination device as in the second aspect, and the vehicle is used to implement the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0032] Therefore, the above technical features of the present application have the following beneficial effects:

[0033] (1) The present application can determine the air system reference current request value of the fuel cell based on the requested power, net output power and performance attenuation parameter of the fuel cell. Since the performance attenuation parameter is used to indicate the attenuation degree of the fuel cell, the determined air system reference current request value is a parameter after considering the attenuation degree of the fuel cell. In this way, based on the air system reference current request value, the accurate reference flow of the air compressor and the reference pressure of the back pressure valve can be determined from the first preset parameter comparison table. Then, based on the reference flow and reference pressure, the required speed of the air compressor and the required opening of the back pressure valve are determined to control the flow of the air compressor and the pressure of the back pressure valve. Based on this scheme, the requested power and net output power of the fuel cell can be comprehensively considered, and further combined with the attenuation degree of the fuel cell, the accurate required speed of the air compressor and the required opening of the back pressure valve can be determined, so as to accurately control the air system parameters of the fuel cell and improve the stability of the air system operation.

[0034] (2) The present application can first determine the error power of the fuel cell based on the difference between the requested power and the net output power, and then determine the input current of the DCDC converter based on the error power. In this way, when determining the input current of the DCDC converter, the error power of the fuel cell is taken into account, thereby improving the accuracy of the determined input current of the DCDC converter. Therefore, based on the input current of the DCDC converter, combined with the performance attenuation parameters, the required speed of the air compressor and the required opening of the back pressure valve can be further accurately determined, thereby accurately controlling the air system parameters of the fuel cell and improving the stability of the air system operation.

[0035] (3) The present application can first determine the current regulation coefficient through a fuzzy controller based on the input current and performance attenuation parameters of the DCDC converter. In this way, the regulated current can be determined by multiplying the current regulation coefficient and the performance attenuation parameter. It can be understood that the regulated current is determined based on the attenuation degree and error power of the fuel cell. In this way, by comprehensively considering the influence of various parameters of the fuel cell on the output current of the stack, the sum of the input current of the DCDC converter and the regulated current is determined as the reference current request value of the air system, and a more accurate reference flow of the air compressor and a reference pressure of the back pressure valve can be obtained.

[0036] (4) The present application can determine the reference speed corresponding to the reference flow rate and the reference opening corresponding to the reference pressure from the second preset parameter comparison table. Then, based on the reference speed and reference opening, the required speed of the air compressor and the required opening of the back pressure valve can be determined by a preset algorithm. In this way, the required speed and required opening are determined after comprehensively considering the attenuation degree and error power of the fuel cell. The required speed and required opening are more accurate and more in line with the actual operating conditions of the fuel cell.

[0037] (5) The present application can determine at least one set of operating data corresponding to each preset power value from multiple sets of operating data based on multiple preset power values. Then, based on the coordinate points of at least one set of operating data corresponding to each preset power value in the preset coordinate system, determine the center coordinate point corresponding to each preset power value in the preset coordinate system. In this way, based on the connection line of the center coordinate points corresponding to each preset power value in the preset coordinate system among the multiple preset power values, the target performance curve corresponding to the fuel cell can be determined. Since the fuel cell has different performance information when it produces different degrees of attenuation, and the performance information of the fuel cell can be accurately determined based on the operating data of the fuel cell. Therefore, based on the current performance information of the fuel cell represented by the target performance curve, combined with the first performance information when the fuel cell is not attenuated, and the second performance information when the attenuation degree of the fuel cell is the preset attenuation degree, the current attenuation degree of the fuel cell can be determined to accurately evaluate the performance attenuation parameters of the fuel cell.

[0038] (6) The present application can determine the corresponding performance curves of the fuel cell when it produces different degrees of attenuation, specifically based on the area of ​​the closed region formed between the corresponding performance curves, to intuitively and accurately determine the performance attenuation parameters of the fuel cell, thereby improving the accuracy of determining the performance attenuation parameters of the fuel cell through specific coordinate information.

[0039] (7) The present application can first determine the power interval corresponding to each preset power value, and then determine at least one set of operating data corresponding to each preset power value based on the power interval of the net output power included in each set of operating data in the multiple sets of operating data. In this way, at least one set of operating data corresponding to each preset power value can be accurately determined, thereby improving the accuracy of the subsequent determination of the target performance curve corresponding to the fuel cell.

[0040] It should be noted that the technical effects brought about by any implementation method in the second to sixth aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0041] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0043] Figure 1 is a schematic diagram of an IV curve corresponding to a fuel cell according to an exemplary embodiment;

[0044] Figure 2 is a structural schematic diagram of an air system parameter determination system according to an exemplary embodiment;

[0045] Figure 3 is a structural schematic diagram of another air system parameter determination system according to an exemplary embodiment;

[0046] Figure 4 is a flow chart showing a method for determining air system parameters according to an exemplary embodiment;

[0047] Figure 5 is a flow chart showing another method for determining air system parameters according to an exemplary embodiment;

[0048] Figure 6 is a flow chart showing another method for determining air system parameters according to an exemplary embodiment;

[0049] Figure 7 is a flow chart of a fuzzy controller according to an exemplary embodiment;

[0050] Figure 8 is a time series data diagram after screening according to an exemplary embodiment;

[0051] Fig. 9is a schematic diagram of a coordinate point cluster according to an exemplary embodiment;

[0052] Fig.10 is a schematic diagram of a target performance curve corresponding to a fuel cell according to an exemplary embodiment;

[0053] Fig.11 is a schematic diagram of a target performance curve corresponding to another fuel cell according to an exemplary embodiment;

[0054] Fig.12 is a flow chart showing another method for determining air system parameters according to an exemplary embodiment;

[0055] Fig.13 is a block diagram of an air system parameter determination device according to an exemplary embodiment;

[0056] Fig.14 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0057] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0058] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application 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 interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0059] Fuel cells, also known as fuel cell engines, are the main power units in fuel cell vehicles, and play an important role in converting chemical energy in fuel (such as hydrogen) into electrical energy. The fuel cell engine is mainly composed of multiple subsystems such as the fuel cell stack, air supply subsystem (i.e., air system), water and heat management subsystem, hydrogen supply subsystem, and fuel cell dedicated DC-DC converter (DC-to-DC converter, DCDC). Specifically include: hydrogen storage tank, pressure reducing valve, proportional valve, ejector, hydrogen-water separator, purge valve, air pressure sensor, humidifier, intercooler, air compressor, intake mass flow sensor, air filter, bypass throttle, bypass mass flow sensor, back pressure throttle and other components. The fuel cell dedicated DCDC is also connected to the vehicle control unit (VCU), DC-to-AC converter (DCAC), power battery, one-way DCDC, and vehicle heating network PTC, and DCAC is also connected to the drive motor.

[0060] During operation, the fuel cell adjusts the DCDC input current (equivalent to the fuel cell stack current) to control the operating power of the fuel cell. The air system, water and heat management subsystem, and hydrogen supply subsystem determine and maintain the corresponding flow, pressure, water temperature and other operating conditions according to the operating power of the fuel cell. During the actual operation of the vehicle, the VCU determines and sends the required power request (i.e. the requested power corresponding to the fuel cell) to the fuel cell controller (FCCU). The FCCU adjusts the DCDC input current to achieve precise control of the net output power of the fuel cell. This process is called engine power closed-loop control.

[0061] However, as the working time of the fuel cell increases, its IV curve is not static. The fuel cell may experience irreversible decay during operation, and experience a series of operating conditions such as dynamic load change, material starvation, dry-wet alternation, membrane dry-water flooding, etc., which will cause irreversible decay of the catalyst, catalyst carbon carrier, diffusion layer, proton exchange membrane, etc., so that the voltage at each current point will drop to varying degrees, which is manifested as a drop in the IV curve. Figure 1 As shown in the figure, after the fuel cell has been working for a certain period of time (e.g., 100h, 200h, 280h, 370h, etc.), the IV curve corresponding to the fuel cell shows the relationship between the corresponding single cell voltage and current (i.e., the target performance curve) when the fuel cell has been working for a certain period of time, and the ideal performance curve corresponding to the fuel cell when it is not working (i.e., the working time is 0h). Since the IV curve is the most direct representation of the output performance of the fuel cell, the decline of the IV curve can intuitively show the degree of fuel cell performance attenuation, that is, the health status of the fuel cell.

[0062] According to the IV curve, under a large current, the mass transfer loss of material transmission is very significant, which is mainly caused by water flooding and insufficient gas supply inside the flow channel. Therefore, the above phenomenon will lead to insufficient flow supply of the fuel cell engine air system. Specifically, the calculation of the oxygen required by the air system according to the demand current is shown in Formula 1:

[0063]

[0064] in, is the molar mass, I FC is the required current of the fuel cell, N cell is the number of cells in the stack, and F is the Faraday constant. The actual output voltage of the fuel cell decreases as the output current increases, especially in high-power scenarios. In order to improve the reliability of the fuel cell engine air system, it is necessary to dynamically adjust the air system according to the health status of the fuel cell.

[0065] The air system parameter determination method provided in the embodiment of the present application can be applied to the air system parameter determination system. Figure 2 FIG. 2 shows a schematic diagram of the structure of an air system parameter determination system. Figure 2 As shown, the air system parameter determination system 20 includes: a controller 21 and a fuel cell 22. The controller 21 may be a fuel cell controller or a vehicle controller, and the fuel cell 22 includes an air system, which includes an air compressor and a back pressure valve.

[0066] The controller 21 may obtain the requested power, the net output power, and the performance degradation parameter of the fuel cell 22 , where the performance degradation parameter is used to indicate the degradation degree of the fuel cell 22 .

[0067] The controller 21 may also determine an air system reference current request value of the fuel cell 22 based on the requested power, the net output power, and the performance degradation parameter.

[0068] The controller 21 can also determine the reference flow of the air compressor and the reference pressure of the back pressure valve from a first preset parameter comparison table based on the air system reference current request value. The first preset parameter comparison table includes reference flows and reference pressures corresponding to different air system reference current request values.

[0069] The controller 21 can also determine the air system parameters of the fuel cell 22 based on the reference flow and reference pressure. The air system parameters include the required speed of the air compressor and the required opening of the back pressure valve. The required speed is used to control the flow of the air compressor, and the required opening is used to control the pressure of the back pressure valve.

[0070] In some embodiments, the controller 21 can specifically determine the difference between the requested power and the net output power as the error power of the fuel cell 22; determine the input current of the DCDC converter based on the error power; and determine the air system reference current request value based on the input current and performance attenuation parameters of the DCDC converter.

[0071] In some embodiments, the controller 21 can specifically determine the current regulation coefficient through a fuzzy controller based on the input current and performance attenuation parameters of the DCDC converter; determine the product of the current regulation coefficient and the performance attenuation parameter as the regulated current; and determine the sum of the input current of the DCDC converter and the regulated current as the air system reference current request value.

[0072] In some embodiments, the controller 21 can specifically determine the reference speed and reference opening from a second preset parameter comparison table based on the reference flow and reference pressure, wherein the second preset parameter comparison table includes reference speeds corresponding to different reference flow rates and reference openings corresponding to different reference pressures; based on the reference speed and reference opening, the required speed of the air compressor and the required opening of the back pressure valve are determined by a preset algorithm.

[0073] In some embodiments, the controller 21 can also determine at least one set of operating data corresponding to each of multiple preset power values ​​from multiple sets of operating data of the fuel cell 22, each set of operating data including: the net output power, stack current and stack voltage of the fuel cell 22; for any one of the multiple preset power values, based on the coordinate points of at least one set of operating data corresponding to any one of the preset power values ​​in the preset coordinate system, determine the center coordinate point corresponding to any one of the preset power values ​​in the preset coordinate system; connect the center coordinate points corresponding to each of the multiple preset power values ​​in the preset coordinate system in sequence to obtain a target performance curve, so as to represent the current performance information of the fuel cell 22 through the target performance curve; based on the current performance information, the first performance information and the second performance information, determine the performance attenuation parameters of the fuel cell 22, the first performance information being the performance information when the fuel cell 22 is not attenuated, and the second performance information being the performance information when the attenuation degree of the fuel cell 22 is the preset attenuation degree.

[0074] In some embodiments, the controller 21 can specifically determine the area of ​​a first closed area formed by the target performance curve and the first performance curve, and the area of ​​a second closed area formed by the first performance curve and the second performance curve, the first performance curve represents first performance information, and the second performance curve represents second performance information; based on the area of ​​the first closed area and the area of ​​the second closed area, the performance attenuation parameters of the fuel cell 22 are determined.

[0075] In some embodiments, the controller 21 can specifically determine the power interval corresponding to any preset power value among multiple preset power values; and determine at least one group of operating data in which the net output power is in the power interval corresponding to any preset power value among multiple groups of operating data as at least one group of operating data corresponding to any preset power value.

[0076] For example, Figure 3 FIG. 2 shows a schematic diagram of another air system parameter determination system. Figure 3 As shown, the air system parameter determination system includes: an air filter, an air compressor, a motor, an intercooler, a shut-off valve, a pressure sensor, a bypass valve, a back pressure valve, a flow meter and a fuel cell.

[0077] The embodiment of the present application is to achieve adaptive control of the air system of the fuel cell engine in different health states and solve the mass transfer loss problem under high current density of the fuel cell. The present application uses the IV curve within the full current range of the current fuel cell as a reference, and specifically uses the percentage of the geometric area of ​​the average IV curve relative to the initial IV curve and the geometric area of ​​the initial IV curve relative to the end-of-life IV curve as quantitative indicators of health status, thereby providing feedback for the adaptive control of the reference pressure and reference flow of the air system. Thereby, the health status (i.e., performance attenuation parameters) of the full power range of the fuel cell can be monitored in real time; and adaptive control of the pressure and flow of the air control subsystem of the fuel cell engine can be achieved under different health states of the system.

[0078] It should be noted that the implementation of the embodiments of the present application requires the preparation of the following hardware and software conditions: a fuel cell engine with complete control capabilities, with system control implemented by the fuel cell engine system controller FCCU; a VCU vehicle controller that controls energy management; a vehicle-side data transmission repeater or relay device with database data transmission and communication capabilities; a data computing service module with data receiving, transmission, storage and computing capabilities; configuration of the CAN communication protocol between DCDC and FCCU to ensure that DCDC can receive the DCDC input current request value signal sent by FCCU, and at the same time, FCCU can receive the DCDC output current and voltage actual value signals sent by DCDC; completion of the configuration of DCDC, FCCU, VCU, data transmission repeater or relay device, data computing service module, and terminal equipment data transmission communication protocol to ensure normal data flow transmission.

[0079] For ease of understanding, the air system parameter determination method provided in this application is specifically introduced below with reference to the accompanying drawings.

[0080] Figure 4 is a flow chart showing a method for determining air system parameters according to an exemplary embodiment. Figure 4As shown, the method includes the following S401-S404:

[0081] S401 : Obtaining the requested power, net output power and performance attenuation parameters of the fuel cell.

[0082] The performance attenuation parameter is used to indicate the attenuation degree of the fuel cell.

[0083] Optionally, after the fuel cell vehicle is powered on and the fuel cell engine is started, the fuel cell engine starts running, and the vehicle controller completes the vehicle required power P based on the energy management strategy. veh The allocation between the power battery and the fuel cell is based on the vehicle power demand P veh , allocate the fuel cell engine net power request value P req (i.e., the requested power of the fuel cell). And, obtain the net output power P of the fuel cell fc and performance degradation parameters (i.e., health status value SOH fc ).

[0084] S402 : Determine a reference current request value of the air system of the fuel cell based on the requested power, the net output power and the performance degradation parameter.

[0085] In some embodiments, Figure 5 As shown, in a method for determining air system parameters provided in an embodiment of the present application, the above step S402 may specifically include S501-S503:

[0086] S501 : Determine the difference between the requested power and the net output power as the error power of the fuel cell.

[0087] S502 : Determine an input current of the DCDC converter based on the error power.

[0088] Optionally, the fuel cell engine controller FCCU can calculate the difference between the requested power and the net output power and use it as the error power e of the fuel cell, so that the air system reference current request value of the fuel cell, i.e., the input terminal current I of the DCDC converter, can be calculated based on the error power e through the engine net power closed-loop control strategy. req (Also called stack current).

[0089] S503 : Determine an air system reference current request value based on the input terminal current and performance attenuation parameter of the DCDC converter.

[0090] It should be noted that the air system reference current request value is a current reference value of the air system control parameter determined by looking up a table according to the input current of the DCDC converter.

[0091] In an embodiment of the present application, the present application can first determine the error power of the fuel cell based on the difference between the requested power and the net output power, and then determine the input current of the DCDC converter based on the error power. In this way, when determining the input current of the DCDC converter, the error power of the fuel cell is taken into account, and the accuracy of the input current of the determined DCDC converter is improved. Therefore, based on the input current of the DCDC converter, combined with the performance attenuation parameters, the required speed of the air compressor and the required opening of the back pressure valve can be further accurately determined, thereby accurately controlling the air system parameters of the fuel cell and improving the stability of the air system operation.

[0092] In some embodiments, Figure 6 As shown, in an air system parameter determination method provided in an embodiment of the present application, the above step S503 may specifically include S601-S603:

[0093] S601 . Determine a current regulation coefficient through a fuzzy controller based on an input current and a performance attenuation parameter of a DCDC converter.

[0094] Optional, such as Figure 7 As shown, the current regulation coefficient α can be obtained by the fuzzy controller, and the input of the fuzzy controller is the input current and performance attenuation parameter of the DCDC converter. By adopting the TS fuzzy control inference algorithm, the output result of the TS model fuzzy control is an accurate value. In actual engineering, the system control demand output requires a specific and accurate value.

[0095] S602: Determine the product of the current regulation coefficient and the performance degradation parameter as the regulation current.

[0096] Optionally, performance degradation may cause the operating conditions of the air system to change. Therefore, it is necessary to determine the performance degradation parameter (i.e., the health status value SOH) based on the performance degradation parameter. fc ), calculate the regulation current The calculation formula is shown in Formula 2:

[0097]

[0098] S603 : Determine the sum of the input current of the DCDC converter and the regulated current as the air system reference current request value.

[0099] Furthermore, since the control parameter of the air system of the fuel cell depends on the current reference value I of the air system control parameter air (That is, the stack current). As the fuel cell decays during use and the operating conditions deviate unfavorably, the net output power P of the fuel cell fc About the stack current I inThe functional relationship will change, because the polarization performance of the battery stack will decrease after attenuation, and the battery stack voltage U in To maintain the same output net power before attenuation, the operating conditions of the air system need to be adaptively changed according to the health of the fuel cell. The operating conditions of the air system are based on the received current signal (i.e., the current reference value I air ), as shown in Formula 3:

[0100]

[0101] In an embodiment of the present application, the present application can first determine the current regulation coefficient through a fuzzy controller based on the input current and performance attenuation parameters of the DCDC converter. In this way, the regulated current can be determined by multiplying the current regulation coefficient and the performance attenuation parameter. It can be understood that the regulated current is determined based on the attenuation degree and error power of the fuel cell. In this way, by comprehensively considering the influence of various parameters of the fuel cell on the output current of the stack, the sum between the input current of the DCDC converter and the regulated current is determined as the reference current request value of the air system, and a more accurate reference flow of the air compressor and the reference pressure of the back pressure valve can be obtained.

[0102] S403: Based on the air system reference current request value, determine a reference flow rate of the air compressor and a reference pressure of the back pressure valve from a first preset parameter comparison table.

[0103] The first preset parameter comparison table includes reference flow rates and reference pressures corresponding to different air system reference current request values.

[0104] Optionally, the first preset parameter comparison table includes the reference flow of the air compressor and the reference pressure of the back pressure valve corresponding to the fuel cell under different air system reference current request values ​​obtained in advance through testing. Thus, the reference pressure and reference flow that meet the air system reference current request value can be determined through the first preset parameter comparison table.

[0105] S404: Determine air system parameters of the fuel cell based on the reference flow and the reference pressure.

[0106] Among them, the air system parameters include the required speed of the air compressor and the required opening of the back pressure valve. The required speed is used to control the flow of the air compressor, and the required opening is used to control the pressure of the back pressure valve.

[0107] In some embodiments, in an air system parameter determination method provided in an embodiment of the present application, the above step S404 may specifically include S701-S702:

[0108] S701. Determine a reference speed and a reference opening from a second preset parameter comparison table based on a reference flow and a reference pressure.

[0109] The second preset parameter comparison table includes reference rotation speeds corresponding to different reference flow rates and reference openings corresponding to different reference pressures.

[0110] Optionally, the second preset parameter comparison table includes reference speeds n corresponding to different reference flow rates obtained in advance. ref (i.e. the air compressor can produce the corresponding reference flow rate of gas at the corresponding reference speed), and the reference opening θ corresponding to different reference pressures ref (That is, the back pressure valve can make the gas produce the corresponding reference pressure at the corresponding reference opening).

[0111] S702: Based on the reference speed and the reference opening, determine the required speed of the air compressor and the required opening of the back pressure valve through a preset algorithm.

[0112] Optionally, during the operation of the fuel cell engine, the flow is controlled by the air compressor, and the pressure is determined by the opening of the back pressure valve. The air compressor and the back pressure valve can be closed-loop controlled by PID. The required speed of the air compressor n req and the required opening of the back pressure valve θ req The waistband can be calculated using the following formula 4.

[0113]

[0114] Among them, k p represents the proportionality coefficient, k i Indicates the integral coefficient, k d represents the differential coefficient, e1 represents the difference between the reference flow and the actual flow, and e2 represents the difference between the reference speed and the actual speed.

[0115] In an embodiment of the present application, the present application can determine the reference speed corresponding to the reference flow rate and the reference opening corresponding to the reference pressure from the second preset parameter comparison table. Then, based on the reference speed and reference opening, the required speed of the air compressor and the required opening of the back pressure valve can be determined by a preset algorithm. In this way, the required speed and required opening are determined after comprehensively considering the attenuation degree and error power of the fuel cell. The determined required speed and required opening are more accurate and more in line with the actual operating conditions of the fuel cell.

[0116] In an embodiment of the present application, the present application can determine the air system reference current request value of the fuel cell based on the requested power, net output power and performance attenuation parameter of the fuel cell. Since the performance attenuation parameter is used to indicate the attenuation degree of the fuel cell, the determined air system reference current request value is a parameter after considering the attenuation degree of the fuel cell. In this way, based on the air system reference current request value, the accurate reference flow of the air compressor and the reference pressure of the back pressure valve can be determined from the first preset parameter comparison table. Then, based on the reference flow and reference pressure, the required speed of the air compressor and the required opening of the back pressure valve are determined to control the flow of the air compressor and the pressure of the back pressure valve. Based on this scheme, the requested power and net output power of the fuel cell can be comprehensively considered, and further combined with the attenuation degree of the fuel cell, the accurate required speed of the air compressor and the required opening of the back pressure valve can be determined, so as to accurately control the air system parameters of the fuel cell and improve the stability of the air system operation.

[0117] In some embodiments, a method for determining air system parameters provided in an embodiment of the present application may further include S801-S804:

[0118] S801. Determine at least one set of operating data corresponding to each preset power value in a plurality of preset power values ​​from a plurality of sets of operating data of a fuel cell.

[0119] Among them, each set of operating data includes: the net output power of the fuel cell, the stack current and the stack voltage.

[0120] Specifically, when the vehicle is driving normally and the fuel cell is operating normally, the vehicle can transmit the operating data of the fuel cell to the cloud server in real time. After receiving the operating data of the fuel cell, the cloud server can calculate the performance curve of the fuel cell in a certain period of time, and estimate the current attenuation degree of the fuel cell based on the obtained performance curve, that is, the performance attenuation parameter (that is, the health state value SOH). fc ).

[0121] Optionally, after the system is started, the cloud server can detect in real time whether a calculation enable signal (i.e., an instruction to determine the target performance parameters of the fuel cell) is received. If the calculation enable signal is received, multiple sets of operating data (i.e., net output power P fc 、Stack current I in , Stack voltage U in ).

[0122] In some embodiments, in an air system parameter determination method provided in an embodiment of the present application, the above-mentioned step S801 may specifically include: for any one of multiple preset power values, determining a power interval corresponding to any preset power value; determining at least one group of operating data in multiple groups of operating data whose net output power is in the power interval corresponding to any preset power value as at least one group of operating data corresponding to any preset power value.

[0123] In the embodiment of the present application, multiple preset power values ​​P=[p1, p2, p3, ..., p n ], and successively determine p from multiple sets of running data j Corresponding to at least one set of operating data, j=1, 2, 3, ..., n.

[0124] Optionally, the net output power P included in each set of operating data may be fc The value of p j ±1%p j Net output power P within the range fc At least one set of corresponding operating data is recorded in time sequence, and the corresponding battery stack current I in , Stack voltage U in , and obtain the time series data diagram of the parameter based on time change. And according to the time series data diagram of the parameter based on time change, the horizontal axis is the battery stack current I in , the left ordinate is the stack voltage U in , the right vertical axis is the net output power P fc , we can get the coordinate point diagram. According to the coordinate point diagram, we can see that as the stack current value increases, the stack voltage value shows a nonlinear downward trend, and the net output power shows a nonlinear upward trend.

[0125] In the embodiment of the present application, the present application can first determine the power interval corresponding to each preset power value, and then determine at least one set of operating data corresponding to each preset power value based on the power interval of the net output power included in each set of operating data in the multiple sets of operating data. In this way, at least one set of operating data corresponding to each preset power value can be accurately determined, thereby improving the accuracy of the subsequent determination of the target performance curve corresponding to the fuel cell.

[0126] S802. For any preset power value among the plurality of preset power values, based on the coordinate points of at least one set of operating data corresponding to any preset power value in the preset coordinate system, determine a central coordinate point corresponding to any preset power value in the preset coordinate system.

[0127] Optionally, a coordinate point cluster of at least one set of operating data corresponding to each preset power value may be determined in a preset coordinate system, thereby determining a central coordinate point c corresponding to each preset power value based on the coordinate point cluster of at least one set of operating data corresponding to each preset power value. j In this way, the center coordinate point corresponding to each preset power value in the plurality of preset power values ​​can be determined respectively.

[0128] S803, sequentially connecting the central coordinate points corresponding to each preset power value in the preset coordinate system of the plurality of preset power values ​​to obtain a target performance curve, so as to represent the current performance information of the fuel cell through the target performance curve.

[0129] Optionally, the central coordinate point corresponding to each preset power value in the preset coordinate system of the plurality of preset power values ​​may be fitted to obtain a target performance curve corresponding to the fuel cell in the time period [t0-b, t0].

[0130] Specifically, based on the horizontal coordinate (i.e., current value) of the center coordinate point corresponding to each preset power value in the preset coordinate system, the center coordinate points corresponding to each preset power value in the preset coordinate system can be connected in order from small to large according to the value of the horizontal coordinate to obtain the target performance curve corresponding to the fuel cell.

[0131] Furthermore, based on the net output power P fc 、Stack current I in , Stack voltage U in The net output power P is calculated by combining the preset power values ​​P = [p1, p2, p3, p4, p5, p6]. fc 、Stack current I in , Stack voltage U in Filter, the filtered values ​​are in p j ±1%p j The net output power in the interval is recorded, and the corresponding stack current and stack voltage are recorded in time series, such as Figure 8 As shown, the net output power P after screening is obtained fc 、Stack current I in , Stack voltage U in Then based on Figure 8 The screened timing data diagram shown in the figure shows that the horizontal axis is the stack current I in , the left ordinate is the stack voltage U in , the right vertical axis is the net output power P fc , a filtered coordinate point map can be obtained. According to the filtered coordinate point map, it can be determined that as the stack current value increases, the stack voltage and net output power present multiple coordinate point clusters in the coordinate system.

[0132] For example, Fig. 9 As shown, a schematic diagram of a coordinate point cluster is shown, taking a 55kW equal power coordinate point cluster in the range of 540A-620A as an example, focusing and amplifying the 55kW equal power coordinate point cluster in the range of 540A-620A, and then solving the geometric center of the coordinate point cluster (i.e., the central coordinate point), and using the current value and voltage value corresponding to the geometric center of the coordinate point cluster as the average stack current and average stack voltage when the fuel cell operates at 55kW equal power. In this way, based on this method, the geometric center of the coordinate point cluster corresponding to each preset power value can be determined. Further, as Fig.10 As shown, by performing nonlinear fitting on the geometric centers corresponding to different preset power values, the target performance curve corresponding to the fuel cell is obtained.

[0133] Further, if Fig.11 As shown, in the schematic diagram of the target performance curve corresponding to the fuel cell, the preset coordinate system includes the target performance curve, the first performance curve (i.e., BoL), and the second performance curve (i.e., EoL), and the area of ​​the first closed area formed by the target performance curve and the first performance curve can be calculated. and the area S of the second closed region formed by the first performance curve and the second performance curve BoL～EoL The target performance parameter SOH of the fuel cell is calculated by the following formula 5 fc .

[0134] S804: Determine a performance attenuation parameter of the fuel cell based on the current performance information, the first performance information, and the second performance information.

[0135] The first performance information is the performance information when the fuel cell is not attenuated, and the second performance information is the performance information when the attenuation degree of the fuel cell is a preset attenuation degree.

[0136] It should be noted that the non-attenuation of the fuel cell can be understood as the fuel cell being a brand new battery with an attenuation degree of 0 (i.e. a battery just manufactured, the health status can be represented as 100); the attenuation degree of the fuel cell being a preset attenuation degree can be understood as the fuel cell having been used to the maximum extent and needs to be scrapped. The preset attenuation degree can be 50%, i.e. the performance of the fuel cell has decayed by 50% (i.e. the health status can be represented as 50), or the preset attenuation degree can be 40%, i.e. the performance of the fuel cell has decayed by 40% (i.e. the health status can be represented as 60).

[0137] In an embodiment of the present application, the present application can determine at least one set of operating data corresponding to each preset power value from multiple sets of operating data based on a plurality of preset power values. Then, based on the coordinate points of at least one set of operating data corresponding to each preset power value in the preset coordinate system, determine the center coordinate point corresponding to each preset power value in the preset coordinate system. In this way, based on the connection line of the center coordinate point corresponding to each preset power value in the preset coordinate system among the plurality of preset power values, the target performance curve corresponding to the fuel cell can be determined. Since the fuel cell has different performance information when different degrees of attenuation are generated, and the performance information of the fuel cell can be accurately determined based on the operating data of the fuel cell. Therefore, based on the current performance information of the fuel cell represented by the target performance curve, combined with the first performance information when the fuel cell is not attenuated, and the second performance information when the attenuation degree of the fuel cell is the preset attenuation degree, the current attenuation degree of the fuel cell can be determined to accurately evaluate the performance attenuation parameters of the fuel cell.

[0138] In some embodiments, in an air system parameter determination method provided in an embodiment of the present application, the above step S804 may specifically include S901-S902:

[0139] S901. Determine an area of ​​a first closed region formed by a target performance curve and a first performance curve, and an area of ​​a second closed region formed by the first performance curve and a second performance curve.

[0140] The first performance curve represents the first performance information, and the second performance curve represents the second performance information.

[0141] S902: Determine a performance attenuation parameter of the fuel cell based on the area of ​​the first enclosed region and the area of ​​the second enclosed region.

[0142] Optionally, the current performance attenuation parameter of the fuel cell may be determined based on the area of ​​the first enclosed region and the area of ​​the second enclosed region.

[0143] Optionally, the preset coordinate system also includes a performance curve corresponding to when the performance decay parameter of the fuel cell is the highest (which may be referred to as the BoL initial curve), and a performance curve corresponding to when the performance decay parameter of the fuel cell is the lowest (i.e., the second preset parameter) (which may be referred to as the EoL end-of-life curve).

[0144] It should be noted that when the performance parameter of the fuel cell is the highest, it can be understood that the fuel cell has not been used after production (i.e., the working time of the fuel cell is 0h); when the performance parameter of the fuel cell is the lowest, it can be understood that after the fuel cell is produced, the performance decays to a certain proportion (e.g., 60%) that has not been used. For example, when the performance parameter of the fuel cell is the highest, the corresponding first preset parameter is 100%, and when the performance parameter of the fuel cell is the lowest, the corresponding second preset parameter is 60%.

[0145] In this way, the area of ​​the first closed region formed by the target performance curve and the first performance curve can be calculated: and the area S of the second closed region formed by the first performance curve and the second performance curve BoL～EoL The target performance parameter SOH of the fuel cell is calculated by formula 5 fc .

[0146]

[0147] In an embodiment of the present application, when determining the corresponding performance curve of the fuel cell when it produces different degrees of attenuation, the present application can intuitively and accurately determine the performance attenuation parameters of the fuel cell based on the area of ​​the closed area formed between the corresponding performance curves, thereby improving the accuracy of determining the performance attenuation parameters of the fuel cell through specific coordinate information.

[0148] For example, Fig.12 As shown, after the performance attenuation parameters are determined through data calculation, the performance attenuation parameters can be transmitted to the FCCU through the data transmission repeater and the vehicle controller. And after obtaining the parameters such as the requested power of the fuel cell, the vehicle controller transmits the requested power of the fuel cell to the FCCU. Furthermore, the DCDC determines the input current of the DCDC converter based on the stack current and stack voltage of the fuel cell, and determines the adjustment current based on the input current of the DCDC converter through fuzzy control and feedforward test table. Thus, the FCCU determines the air system reference current request value based on the input current and adjustment current of the DCDC converter, and transmits it to the FCCU.

[0149] The embodiment of the present application relies on data of fuel cell engine net power, stack current, and stack voltage data. More specifically, the transmission link of fuel cell engine operation data is the fuel cell engine controller FCCU, the vehicle controller VCU, the data transmission repeater, and the data operation module. The health status value of the fuel cell engine is calculated according to the data operation module, and is transmitted back to the vehicle controller VCU and the fuel cell engine controller FCCU by the database through the data transmission link.

[0150] Furthermore, the VCU can adjust the way the vehicle's required power is distributed to the fuel cell engine according to the fuel cell engine health status value, that is, adjust the fuel cell engine net power request value, so that the fuel cell engine can reasonably respond to the vehicle's required power according to its own health status and delay life attenuation. The FCCU can adjust the operating reference flow and reference pressure of the fuel cell engine air supply according to the fuel cell engine health status value to improve the power output of the fuel cell engine. In addition, the fuel cell engine health status value calculated by the data calculation module can also indirectly reflect the mass transfer loss of concentration loss.

[0151] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to achieve the above functions, the air system parameter determination device or electronic device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware 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 exceed the scope of this application.

[0152] The embodiments of the present application can exemplarily divide the functional modules of the air system parameter determination device or electronic device according to the above method. For example, the air system parameter determination device or electronic device can include various functional modules corresponding to the various functional divisions, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

[0153] Fig.13 is a block diagram of an air system parameter determination device according to an exemplary embodiment. Fig.13 The air system parameter determination device 1300 includes: an acquisition module 1301 and a processing module 1302 .

[0154] The acquisition module 1301 is used to obtain the requested power, net output power and performance attenuation parameters of the fuel cell, and the performance attenuation parameters are used to indicate the attenuation degree of the fuel cell; the processing module 1302 is used to determine the air system reference current request value of the fuel cell based on the requested power, net output power and performance attenuation parameters; the processing module 1302 is also used to determine the reference flow of the air compressor and the reference pressure of the back pressure valve from a first preset parameter comparison table based on the air system reference current request value, and the first preset parameter comparison table includes reference flows and reference pressures corresponding to different air system reference current request values; the processing module 1302 is also used to determine the air system parameters of the fuel cell based on the reference flow and reference pressure, and the air system parameters include the required speed of the air compressor and the required opening of the back pressure valve, the required speed is used to control the flow of the air compressor, and the required opening is used to control the pressure of the back pressure valve.

[0155] In one possible implementation, the processing module 1302 is specifically used to determine the difference between the requested power and the net output power as the error power of the fuel cell; the processing module 1302 is specifically used to determine the input current of the DCDC converter based on the error power; the processing module 1302 is specifically used to determine the air system reference current request value based on the input current and performance attenuation parameters of the DCDC converter.

[0156] In one possible implementation, the processing module 1302 is specifically used to determine the current regulation coefficient through a fuzzy controller based on the input current and performance attenuation parameter of the DCDC converter; the processing module 1302 is specifically used to determine the product of the current regulation coefficient and the performance attenuation parameter as the regulated current; the processing module 1302 is specifically used to determine the sum of the input current of the DCDC converter and the regulated current as the air system reference current request value.

[0157] In one possible implementation, the processing module 1302 is specifically used to determine a reference speed and a reference opening from a second preset parameter comparison table based on a reference flow and a reference pressure, wherein the second preset parameter comparison table includes reference speeds corresponding to different reference flow rates and reference openings corresponding to different reference pressures; the processing module 1302 is specifically used to determine the required speed of the air compressor and the required opening of the back pressure valve through a preset algorithm based on the reference speed and the reference opening.

[0158] In one possible embodiment, the processing module 1302 is also used to determine at least one set of operating data corresponding to each preset power value in a plurality of preset power values ​​from a plurality of sets of operating data of the fuel cell, each set of operating data including: the net output power of the fuel cell, the stack current and the stack voltage; the processing module 1302 is also used to determine, for any one of the plurality of preset power values, a center coordinate point corresponding to any one of the plurality of preset power values ​​in the preset coordinate system based on the coordinate point in the preset coordinate system of at least one set of operating data corresponding to any one of the preset power values; the processing module 1302 is also used to sequentially connect the center coordinate points corresponding to each of the plurality of preset power values ​​in the preset coordinate system to obtain a target performance curve, so as to represent the current performance information of the fuel cell through the target performance curve; the processing module 1302 is also used to determine the performance attenuation parameter of the fuel cell based on the current performance information, the first performance information and the second performance information, the first performance information being the performance information when the fuel cell is not attenuated, and the second performance information being the performance information when the attenuation degree of the fuel cell is a preset attenuation degree.

[0159] In one possible implementation, processing module 1302 is specifically used to determine the area of ​​a first closed region formed by a target performance curve and a first performance curve, and the area of ​​a second closed region formed by the first performance curve and a second performance curve, the first performance curve representing first performance information, and the second performance curve representing second performance information; processing module 1302 is specifically used to determine the performance attenuation parameters of the fuel cell based on the area of ​​the first closed region and the area of ​​the second closed region.

[0160] In one possible implementation, the processing module 1302 is specifically used to determine, for any one of a plurality of preset power values, a power interval corresponding to any one of the preset power values; the processing module 1302 is specifically used to determine, among a plurality of sets of operating data, at least one set of operating data in which the net output power is in the power interval corresponding to any one of the preset power values ​​as at least one set of operating data corresponding to any one of the preset power values.

[0161] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0162] Fig.14 FIG. 1 is a block diagram of an electronic device according to an exemplary embodiment. Fig.14 As shown, the electronic device 1400 includes but is not limited to: a processor 1401 and a memory 1402 .

[0163] The memory 1402 is used to store executable instructions of the processor 1401. It can be understood that the processor 1401 is configured to execute instructions to implement the air system parameter determination method in the above embodiment.

[0164] It should be noted that those skilled in the art can understand that Fig.14 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and the electronic device may include Fig.14 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0165] The processor 1401 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 1402, and calling data stored in the memory 1402, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. The processor 1401 may include one or more processing units. Optionally, the processor 1401 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 1401.

[0166] The memory 1402 may be used to store software programs and various data. The memory 1402 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one functional module (such as a processing module, etc.), etc. In addition, the memory 1402 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0167] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 1402 including instructions, and the above instructions can be executed by the processor 1401 of the electronic device 1400 to implement the air system parameter determination method in the above embodiment.

[0168] In actual implementation, Fig.13 The functions of the acquisition module 1301 and the processing module 1302 in Fig.14 The processor 1401 in the embodiment calls the computer program stored in the memory 1402. The specific execution process can refer to the description of the air system parameter determination method in the above embodiment, which will not be repeated here.

[0169] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0170] In an exemplary embodiment, the present application also provides a computer program product including one or more instructions, which can be executed by the processor 1401 of the electronic device 1400 to complete the air system parameter determination method in the above embodiment.

[0171] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the processor of the electronic device, the various processes of the above-mentioned air system parameter determination method embodiment are implemented, and the same technical effect as the above-mentioned air system parameter determination method can be achieved. To avoid repetition, they will not be repeated here.

[0172] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0173] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, 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.

[0174] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0175] In addition, each functional unit in each embodiment of the present application 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.

[0176] 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 readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the full classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including a number of instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute the full classification part or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, ROM, RAM, disk or CD and other media that can store program code.

[0177] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for determining air system parameters, characterized in that: The method comprises: Acquiring a requested power, a net output power and a performance attenuation parameter of a fuel cell, wherein the performance attenuation parameter is used to indicate the attenuation degree of the fuel cell; determining an air system reference current request value of the fuel cell based on the requested power, the net output power and the performance degradation parameter; Based on the air system reference current request value, determine a reference flow rate of the air compressor and a reference pressure of the back pressure valve from a first preset parameter comparison table, wherein the first preset parameter comparison table includes reference flows and reference pressures corresponding to different air system reference current request values; Based on the reference flow and the reference pressure, the air system parameters of the fuel cell are determined. The air system parameters include the required speed of the air compressor and the required opening of the back pressure valve. The required speed is used to control the flow of the air compressor, and the required opening is used to control the pressure of the back pressure valve.

2. The method according to claim 1, characterized in that The step of determining the air system reference current request value of the fuel cell based on the requested power, the net output power and the performance degradation parameter comprises: determining a difference between the requested power and the net output power as an error power of the fuel cell; determining an input current of a DCDC converter based on the error power; The air system reference current request value is determined based on the input terminal current of the DCDC converter and the performance degradation parameter.

3. The method according to claim 2, characterized in that The determining the air system reference current request value based on the input terminal current of the DCDC converter and the performance attenuation parameter comprises: Determining a current regulation coefficient by a fuzzy controller based on the input current of the DCDC converter and the performance degradation parameter; Determine the product of the current regulation coefficient and the performance degradation parameter as the regulation current; The sum of the input terminal current of the DCDC converter and the regulated current is determined as the air system reference current request value.

4. The method according to any one of claims 1 to 3, characterized in that The step of determining the air system parameters of the fuel cell based on the reference flow rate and the reference pressure includes: Based on the reference flow rate and the reference pressure, determining a reference speed and a reference opening from a second preset parameter comparison table, wherein the second preset parameter comparison table includes reference speeds corresponding to different reference flow rates and reference openings corresponding to different reference pressures; Based on the reference speed and the reference opening, the required speed of the air compressor and the required opening of the back pressure valve are determined by a preset algorithm.

5. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: Determine at least one set of operating data corresponding to each preset power value in a plurality of preset power values ​​from a plurality of sets of operating data of the fuel cell, each set of operating data comprising: a net output power, a stack current and a stack voltage of the fuel cell; For any one of the plurality of preset power values, based on a coordinate point of at least one set of operating data corresponding to the any one of the preset power values ​​in a preset coordinate system, determining a central coordinate point corresponding to the any one of the preset power values ​​in the preset coordinate system; Connecting the central coordinate points corresponding to each of the plurality of preset power values ​​in the preset coordinate system in sequence to obtain a target performance curve, so as to represent the current performance information of the fuel cell through the target performance curve; The performance attenuation parameter of the fuel cell is determined based on the current performance information, the first performance information and the second performance information, wherein the first performance information is the performance information when the fuel cell is not attenuated, and the second performance information is the performance information when the attenuation degree of the fuel cell is a preset attenuation degree.

6. The method according to claim 5, characterized in that The determining the performance attenuation parameter of the fuel cell based on the current performance information, the first performance information, and the second performance information includes: Determining an area of ​​a first closed region formed by the target performance curve and a first performance curve, and an area of ​​a second closed region formed by the first performance curve and a second performance curve, the first performance curve representing the first performance information, and the second performance curve representing the second performance information; The performance degradation parameter of the fuel cell is determined based on an area of ​​the first enclosed region and an area of ​​the second enclosed region.

7. The method according to claim 5, characterized in that The step of determining at least one set of operating data corresponding to each of a plurality of preset power values ​​from a plurality of sets of operating data of the fuel cell comprises: For any one of the plurality of preset power values, determining a power interval corresponding to the any one of the preset power values; Among the multiple groups of operating data, at least one group of operating data whose net output power is within the power interval corresponding to any one of the preset power values ​​is determined as at least one group of operating data corresponding to any one of the preset power values.

8. An air system parameter determination device, characterized in that: The air system parameter determination device comprises: an acquisition module and a processing module; The acquisition module is used to acquire the requested power, net output power and performance attenuation parameter of the fuel cell, wherein the performance attenuation parameter is used to indicate the attenuation degree of the fuel cell; The processing module is used to determine the air system reference current request value of the fuel cell based on the requested power, the net output power and the performance degradation parameter; The processing module is further used to determine a reference flow rate of the air compressor and a reference pressure of the back pressure valve from a first preset parameter comparison table based on the air system reference current request value, wherein the first preset parameter comparison table includes reference flows and reference pressures corresponding to different air system reference current request values; The processing module is also used to determine the air system parameters of the fuel cell based on the reference flow and the reference pressure. The air system parameters include the required speed of the air compressor and the required opening of the back pressure valve. The required speed is used to control the flow of the air compressor, and the required opening is used to control the pressure of the back pressure valve.

9. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: When the computer-executable instructions stored in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device executes the method as claimed in any one of claims 1 to 7.

11. A computer program product, characterized in that The computer program product comprises computer instructions, and when the computer instructions are executed on an electronic device, the electronic device is caused to execute the method according to any one of claims 1 to 7.

12. A vehicle, characterized in that: The vehicle comprises the air system parameter determination device according to claim 8, and the vehicle is used to implement the method according to any one of claims 1-7.

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