Control Method and Device for Dual Proportion Valve in a Fuel Cell System

Abstract

The present application discloses a control method and device for a dual proportional valve in a fuel cell system, relating to the technical field of fuel cells. The method includes: determining whether it is necessary to switch the target proportional valve operating in the current target operating state based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state; if it is necessary to switch the target proportional valve, determining the switching duty ratio of the target proportional valve based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve. The embodiment provided by the present application improves the switching accuracy of the target proportional valve while reducing the hysteresis of the target proportional valve during switching, thereby avoiding overshoot or undervoltage fluctuations in the hydrogen pressure on the anode side of the stack, reducing the probability of single low faults occurring in the stack, and extending the service life of the fuel cell to be detected.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cell systems, and particularly to a control method and device for a dual proportional valve in a fuel cell system. Background Art

[0002] Currently, with the development of society and the progress of technology, fuel cell systems are increasingly widely used in new energy vehicles. However, with the in-depth application, the current fuel cell systems face many challenges in terms of efficiency improvement and cost reduction. And currently, ejectors are often used to replace hydrogen pumps for hydrogen, especially for high-power fuel cell systems, a large and a small dual ejectors are required to meet the hydrogen flow requirements in different power segments.

[0003] However, in some special power segments, such as when the power in the fuel cell system increases to the point where the opening of the small proportional valve can no longer meet the hydrogen flow requirements in the corresponding fuel cell system and the small proportional valve needs to be switched, or when the power in the fuel cell system decreases to the point where the opening of the proportional valve far exceeds the hydrogen flow requirements in the fuel cell system and the large proportional valve needs to be switched. When the proportional valve in the fuel cell system needs to be switched, due to the large environmental impact at different hydrogen flows, it will cause the hydrogen flow to be advanced or lagged during the process of switching the proportional valve, thereby reducing the switching accuracy. And whether the proportional valve is switched in advance or lagged will cause fluctuations in overshoot or underpressure of the hydrogen pressure on the anode side of the stack, which may seriously cause a single low fault in the stack, and then shorten the service life of the fuel cell. Summary of the Invention

[0004] The embodiments of the present application provide a control method and device for a dual proportional valve in a fuel cell system. The embodiments provided by the present application solve the technical problems of poor switching accuracy, single low fault in the stack, and short service life of the fuel cell in the prior art. The embodiments provided by the present application improve the switching accuracy of the target proportional valve while reducing the hysteresis of the target proportional valve during switching, thereby avoiding fluctuations in overshoot or underpressure of the hydrogen pressure on the anode side of the stack, reducing the probability of a single low fault in the stack, and extending the service life of the fuel cell to be detected.

[0005] In the first aspect of the embodiments of the present application, the embodiments of the present application provide a control method for a dual proportional valve in a fuel cell system. The control method for the dual proportional valve in the fuel cell system includes:

[0006] Based on the target operating power of the fuel cell system to be detected within a preset time period, determine the target operating state of the fuel cell system to be detected;

[0007] For any of the target operating states, based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, determine whether it is necessary to switch the target proportional valve that is operating in the current target operating state, where there are two target proportional valves for mutual switching in the fuel cell system to be detected;

[0008] If it is not necessary to switch the target proportional valve, then based on a preset duty ratio algorithm, determine the target output duty ratio corresponding to the target proportional valve, so as to complete the opening control of the target proportional valve;

[0009] If it is necessary to switch the target proportional valve, then based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, determine the switching duty ratio of the target proportional valve, and based on the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after switching, determine the initial switching duty ratio of the other target proportional valve, so as to complete the switching between the target proportional valve and the other target proportional valve.

[0010] In a feasible implementation manner, the target proportional valve includes a low-power proportional valve and a high-power proportional valve. For any of the target operating states, based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, determining whether it is necessary to switch the target proportional valve that is operating in the current target operating state includes;

[0011] For any target operating state, determine the first ratio between the first actual duty ratio of the low-power proportional valve and the first preset start-stop critical threshold duty ratio, or determine the second ratio between the second actual duty ratio of the high-power proportional valve and the preset start-stop critical threshold duty ratio;

[0012] When the first ratio or the second ratio is 1, determine whether there is a difference between the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state;

[0013] If there is a difference and the difference is greater than zero, determine that it is necessary to switch the low-power proportional valve that is operating in the current target operating state to a high-power proportional valve;

[0014] If there is a difference and the difference is less than zero, determine that it is necessary to switch the high-power proportional valve that is operating in the current target operating state to a low-power proportional valve;

[0015] If there is no difference, determine that it is not necessary to switch the high-power proportional valve / low-power proportional valve that is operating in the current target operating state.

[0016] In a feasible implementation manner, if it is not necessary to switch the target proportional valve, then based on a preset duty ratio algorithm, determine the target output duty ratio corresponding to the target proportional valve, so as to complete the opening control of the target proportional valve, including:

[0017] If it is not necessary to switch the low-power proportional valve, then based on a first preset duty ratio algorithm, determine the first target output duty ratio of the low-power proportional valve, so as to complete the opening control of the low-power proportional valve, where the first preset duty ratio algorithm is determined based on a first preset proportional integral coefficient, the target hydrogen pressure under the current target operating state, and the actual hydrogen pressure.

[0018] In a feasible implementation manner, the first preset start-stop critical threshold duty ratio includes a small proportional valve opening limit threshold duty ratio, the second preset start-stop critical threshold duty ratio includes a large proportional valve opening threshold duty ratio. If it is necessary to switch the target proportional valve, then based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, determine the switching duty ratio of the target proportional valve, and based on the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after switching, determine the initial switching duty ratio of the other target proportional valve, so as to complete the switching between the target proportional valve and the other target proportional valve, including:

[0019] If it is necessary to switch the low-power proportional valve to a high-power proportional valve, then based on the small proportional valve opening limit threshold duty ratio corresponding to the low-power proportional valve, determine the switching duty ratio of the low-power proportional valve;

[0020] And based on the large proportional valve opening threshold duty ratio corresponding to the high-power proportional valve after switching, determine the initial switching duty ratio of the high-power proportional valve, so as to complete the switching of the low-power proportional valve to the high-power proportional valve.

[0021] In a feasible implementation manner, if it is not necessary to switch the target proportional valve, then based on a preset duty ratio algorithm, determine the target output duty ratio corresponding to the target proportional valve, so as to complete the opening control of the target proportional valve, further including:

[0022] If it is not necessary to switch the high-power proportional valve, then based on a second preset duty ratio algorithm, determine the second target output duty ratio of the high-power proportional valve, so as to complete the opening control of the high-power proportional valve, where the second preset duty ratio algorithm is determined based on a second preset proportional integral coefficient, the target hydrogen pressure under the current target operating state, and the actual hydrogen pressure.

[0023] In a feasible implementation manner, the first preset start-stop critical threshold duty ratio includes a large-ratio valve closing threshold duty ratio, and the second preset start-stop critical threshold duty ratio includes a small-ratio valve closing limit threshold duty ratio. If it is necessary to switch the target proportional valve, then based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, determine the switching duty ratio of the target proportional valve, and based on the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after switching, determine the initial switching duty ratio of the other target proportional valve, so as to complete the switching between the target proportional valve and the other target proportional valve. It further includes:

[0024] If it is necessary to switch the high-power proportional valve to the low-power proportional valve, then based on the large-ratio valve closing threshold duty ratio corresponding to the high-power proportional valve, determine the switching duty ratio of the high-power proportional valve;

[0025] And based on the small-ratio valve closing limit threshold duty ratio corresponding to the low-power proportional valve after switching, determine the initial switching duty ratio of the switched low-power proportional valve, so as to complete the switching of the high-power proportional valve to the low-power proportional valve again.

[0026] In a feasible implementation manner, for any of the target operating states, based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, determine whether it is necessary to switch the target proportional valve that is operating in the current target operating state. It further includes:

[0027] When the fuel cell system to be detected is in the initial startup state, determine that both the target hydrogen pressure and the actual hydrogen pressure are zero, and based on the small-ratio valve opening threshold duty ratio, control the small-ratio valve to open.

[0028] In the second aspect of the embodiments of the present application, the embodiments of the present application provide a control device for a dual proportional valve in a fuel cell system. The control device for the dual proportional valve in the fuel cell system includes:

[0029] A first determination module, configured to determine the target operating state of the fuel cell system to be detected based on the target operating power of the fuel cell system to be detected within a preset time period;

[0030] A second determination module, configured to, for any of the target operating states, determine whether it is necessary to switch the target proportional valve that is operating in the current target operating state based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, where there are two target proportional valves for mutual switching in the fuel cell system to be detected;

[0031] A third determination module, configured to, if it is not necessary to switch the target proportional valve, determine a target output duty ratio corresponding to the target proportional valve based on a preset duty ratio algorithm, so as to complete the opening control of the target proportional valve;

[0032] A fourth determination module, configured to, if it is necessary to switch the target proportional valve, determine a switching duty ratio of the target proportional valve based on a first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, and determine a switching initial duty ratio of the other target proportional valve based on a second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after switching, so as to complete the switching between the target proportional valve and the other target proportional valve.

[0033] In a third aspect of the embodiments of the present application, an electronic device is provided, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device runs, the processor communicates with the memory through the bus. When the machine-readable instructions are run by the processor, the steps of the control method of the dual proportional valve in the fuel cell system as described above are executed.

[0034] In a fourth aspect of the embodiments of the present application, a computer-readable storage medium is provided. A computer program is stored on the computer-readable storage medium. When the computer program is run by a processor, the steps of the control method of the dual proportional valve in the fuel cell system as described above are executed.

[0035] The control method and device for a dual proportional valve in a fuel cell system provided by an embodiment of the present application, compared with the prior art, determine the target operating state of the fuel cell system to be detected based on the target operating power of the fuel cell system to be detected within a preset time period, and for any target operating state, determine whether it is necessary to switch the target proportional valve operating in the current target operating state based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state. When it is not necessary to switch the target proportional valve, determine the target output duty ratio corresponding to the target proportional valve based on a preset duty ratio algorithm to complete the opening control of the target proportional valve. When it is necessary to switch the target proportional valve, determine the switching duty ratio of the target proportional valve based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, and determine the switching initial duty ratio of the other target proportional valve based on the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after switching to complete the switching between the target proportional valve and the other target proportional valve. The embodiment provided by the present application reflects the current threshold for controlling the adjustment of the target proportional valve in the form of a duty ratio threshold. Without increasing the cost of the controller hardware in the fuel cell system to be detected, precise control of the operation of the target proportional valve is achieved through the duty ratio, improving the switching accuracy of the target proportional valve while reducing the hysteresis during the switching of the target proportional valve, thereby avoiding overshoot or underpressure fluctuations in the hydrogen pressure on the anode side of the fuel cell stack, reducing the probability of single-low failures of the fuel cell stack, and extending the service life of the fuel cell to be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The flowchart showing the control method for a dual proportional valve in a fuel cell system provided by an embodiment of the present application;

[0037] Figure 2 The schematic diagram showing the working characteristic curves of each target proportional valve in the control method for a dual proportional valve in a fuel cell system provided by an embodiment of the present application;

[0038] Figure 3 The schematic diagram showing the resistance characteristic curves of any target proportional valve in a fuel cell system provided by an embodiment of the present application at different temperatures;

[0039] Figure 4 The schematic diagram showing the resistance characteristic curves of any target proportional valve in a fuel cell system provided by an embodiment of the present application at different temperatures;

[0040] Figure 5 The block diagram showing the control device for a dual proportional valve in a fuel cell system provided by an embodiment of the present application;

[0041] Figure 6The schematic structural diagram of an electronic device provided by an embodiment of the present application is shown.

[0042] Figure 5 and Figure 6 The corresponding relationship between the reference numerals and the drawing names in the figure is as follows:

[0043] The control device of the dual proportional valve in the 500 fuel cell system; 510 the first determination module; 520 the second determination module; 530 the third determination module; 540 the fourth determination module; 600 the electronic device; 610 the processor; 620 the memory; 630 the bus. Detailed implementation manners

[0044] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific features in the embodiments of this specification and the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. Without conflict, the technical features in the embodiments of this specification and the embodiments can be combined with each other.

[0045] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element. The term "more than two" includes two or more than two.

[0046] First, the applicable application scenarios of the present application are introduced. The embodiments provided by the present application are applicable to the fuel cell technology field.

[0047] Currently, in some special power ranges, when the power in the fuel cell system increases to a point where the opening of the small proportional valve can no longer meet the hydrogen flow demand in the corresponding fuel cell system and the small proportional valve needs to be switched, or when the power in the fuel cell system drops to a point where the opening of the proportional valve far exceeds the hydrogen flow demand in the fuel cell system and the large proportional valve needs to be switched, when the proportional valve in the fuel cell system needs to be switched, due to the significant environmental impact at different hydrogen flow rates, it will cause the hydrogen flow to be advanced or delayed during the process of switching the proportional valve, thereby reducing the accuracy of the switch. And whether the proportional valve is switched in advance or delayed will cause fluctuations in overshoot or underpressure of the hydrogen pressure on the anode side of the stack, and in severe cases, it will cause a single low fault in the stack, thereby shortening the service life of the fuel cell.

[0048] Based on this, the embodiments of the present application provide a control method and device for a dual proportional valve in a fuel cell system. The embodiments provided by the present application solve the technical problems of poor switching accuracy, single low fault in the stack, and short service life of the fuel cell in the prior art. The embodiments provided by the present application improve the switching accuracy of the target proportional valve while reducing the hysteresis of the target proportional valve during switching, thereby avoiding fluctuations in overshoot or underpressure of the hydrogen pressure on the anode side of the stack, reducing the probability of a single low fault in the stack, and extending the service life of the fuel cell to be detected.

[0049] Please refer to Figure 1 , Figure 1 which is a flowchart of a control method for a dual proportional valve in a fuel cell system provided by an embodiment of the present application. As Figure 1 shown, the control method for a dual proportional valve in a fuel cell system includes the following steps:

[0050] S101. Based on the target operating power of the fuel cell system to be detected within a preset time period, determine the target operating state of the fuel cell system to be detected.

[0051] In this step, assume that the target operating power in the embodiments provided by the present application corresponds to different target operating states under different preset time periods. Among them, different operating states can be adaptively adjusted according to different application scenarios. Assume that the target operating states in the embodiments provided by the present application include but are not limited to low power operating state, low power switching state, high power initial startup state, high power operating state, high power switching state, and high power operating state after switching, etc. And the low power operating state corresponds to the operating state of the small proportional valve, and the high power operating state corresponds to the operating state of the large proportional valve.

[0052] It can be understood that at different operating powers, assume that the opening degrees of different target proportional valves in the embodiments provided by the present application are different.

[0053] S102. For any target operating state, based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, determine whether it is necessary to switch the target proportional valve that is operating in the current target operating state, where the fuel cell system to be detected includes two target proportional valves for mutual switching.

[0054] In this step, after determining the different types of target operating states corresponding to the fuel cell system to be detected, for any target operating state, first determine the first ratio between the first actual duty cycle of the low-power proportional valve in the target proportional valve and the first preset start-stop critical threshold duty cycle, or determine the second ratio between the second actual duty cycle of the high-power proportional valve and the preset start-stop critical threshold duty cycle. When the first ratio or the second ratio is 1, determine the target hydrogen pressure H2_PDmd and the actual hydrogen pressure H2_PStkIn of the fuel cell system to be detected in the current target operating state, and based on the difference between the target hydrogen pressure and the actual hydrogen pressure, determine whether it is necessary to switch the target proportional valve to adapt to the current target hydrogen pressure (the required value of the hydrogen pressure).

[0055] In the above, the difference in the embodiments provided in the present application can be specifically but not limited to being represented by H2_PErr, where H2_PErr = H2_PDmd - H2_PStkIn.

[0056] It can be understood that before determining whether it is necessary to switch the target proportional valve that is operating in the target operating state, the embodiments provided in the present application first need to test the working characteristics of the two target proportional valves (assuming that the two target proportional valves in the embodiments provided in the present application can be specifically but not limited to the low-power proportional valve and the high-power proportional valve) on the hydrogen subsystem test bench (please refer to Figure 2 , Figure 2 the schematic diagram of the working characteristic curves of each target proportional valve in a control method for dual proportional valves in a fuel cell system provided in the embodiments of the present application), and then based on the above historical start-stop current data, determine the start-stop critical threshold current curves of each target proportional valve under different hydrogen medium pressures, as shown in Figure 3 shown, please refer to Figure 3 , Figure 3 is the schematic diagram of the start-stop critical threshold current curves under different hydrogen medium pressures in a control method for dual proportional valves in a fuel cell system provided in the embodiments of the present application, as shown in Figure 3 shown. Assume that the hydrogen medium pressure monitored in real time by the fuel cell system to be detected is represented by H2_PMid, and according to Figure 3The start-stop critical threshold current curve shown can determine: the opening threshold current I_HGI1OpenThrd of the small proportional valve, the opening working limit current I_HGI1OpenLimtThrd of the small proportional valve, the closing working limit current I_HGI1CloseLimtThrd of the small proportional valve, the opening threshold current I_HGI2OpenThrd of the large proportional valve, and the closing threshold current I_HGI2CloseThrd of the large proportional valve.

[0057] However, since the control of a common fuel cell system only controls the duty cycle function of Pulse Width Modulation (PWM) and cannot directly control the output current, therefore, the embodiments provided in this application can accurately convert the measured start-stop threshold currents corresponding to the two target proportional valves into PWM duty cycle thresholds without increasing the hardware cost of the fuel cell controller. Specifically, the embodiments provided in this application convert the start-stop threshold currents corresponding to the two target proportional valves into PWM duty cycle thresholds in the following manner:

[0058] First, assume that the embodiments provided in this application will, for any target proportional valve, install a temperature sensor in the electromagnetic coil of the target proportional valve to detect temperature data in real time, and then, based on the temperature data detected by the current sensor, determine the resistance characteristic curve of the electromagnetic coil of the target proportional valve at different temperatures. For specific details, please refer to Figure 4 , Figure 4 which is a schematic diagram of the resistance characteristic curve of any target proportional valve in a fuel cell system provided by the embodiments of this application at different temperatures. As Figure 4 shown, the resistance value can be specifically represented by: R_HGI_Y; among them, the two target proportional valves in the embodiments provided in this application can be specifically but not limited to a small-power proportional valve and a large-power proportional valve. Here, a small ejector is used to match the small-power proportional valve to meet the hydrogen circulation control requirements at idle speed and low power, while a large ejector is required for medium and high power to match the large-power proportional valve to intervene and meet the hydrogen circulation control requirements.

[0059] Then, based on the external battery voltage, resistance, and the limit current of each proportional valve, determine the limit duty cycle corresponding to each proportional valve.

[0060] In the above, the embodiments provided in this application need to determine the external battery voltage U_Bat provided by the external battery for the fuel cell system to be detected in real-time monitoring. Moreover, it can be seen that the voltage U_HGI output to both ends of the proportional valve by the controller of the fuel cell system to be detected through PWM duty cycle adjustment is specifically: U_HGI = U_Bat * Duty_HGI / 100.

[0061] Here, a temperature sensor is built into the electromagnetic coil of the target proportional valve to detect temperature data in real time, specifically T_HGI. According to the electromagnetic coil temperature-resistance curve, the real-time resistance value corresponding to the target proportional valve is obtained by looking up the table as R_HGI. According to Ohm's law, the following formula can be obtained:

[0062] I_HGI = U_HGI / R_HGI;

[0063] Duty_HGI = I_HGI * R_HGI * 100 / U_Bat.

[0064] According to the above calculations, the following parameters corresponding to the two target proportional valves can be determined:

[0065] The duty ratio of the small proportional valve opening threshold, Duty_HGI1OpenThrd;

[0066] The duty ratio of the small proportional valve opening limit threshold, Duty_HGI1OpenLimtThrd;

[0067] The duty ratio of the small proportional valve closing limit threshold, Duty_HGI1CloseLimtThrd;

[0068] The duty ratio of the large proportional valve opening threshold, Duty_HGI2OpenThrd;

[0069] The duty ratio of the large proportional valve closing threshold, Duty_HGI2CloseThrd.

[0070] S103. If it is not necessary to switch the target proportional valve, then based on the preset duty ratio algorithm, determine the target output duty ratio corresponding to the target proportional valve to complete the opening control of the target proportional valve.

[0071] In this step, after determining that it is not necessary to switch the target proportional valve operating in the current target operating state, that is, when the target proportional valve is in the low-power operation stage and / or the high-power operation stage, then based on the preset duty ratio algorithms corresponding to the two PI controllers, determine the target output duty ratios corresponding to the respective target proportional valves.

[0072] It can be understood that since the two target proportional valves in the embodiments provided in this application are specifically a high-power proportional valve and a low-power proportional valve, therefore, determining the target output duty ratio corresponding to the low-power proportional valve can be specifically but not limited to:

[0073] ;

[0074] The target output duty ratio corresponding to the high-power proportional valve can be specifically but not limited to:

[0075] ;

[0076] Among them, and are both used to represent different preset proportional-integral coefficients, and the embodiments provided in this application can, but are not limited to, be applied to the target proportional valves of different types of manufacturers by setting different PI parameters.

[0077] S104. If it is necessary to switch the target proportional valve, then based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, determine the switching duty ratio of the target proportional valve, and based on the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after switching, determine the initial switching duty ratio of the other target proportional valve, so as to complete the switching between the target proportional valve and the other target proportional valve.

[0078] In this step, when it is determined that the high-power proportional valve is in the power-down stage, or it is determined that the low-power proportional valve is in the power-up stage, there is a process of needing to switch the corresponding target proportional valve. After it is determined to switch any one of the target proportional valves, the embodiments provided in this application need to determine the first preset start-stop critical threshold duty ratio corresponding to this target proportional valve as the switching duty ratio of this target proportional valve in the current operating state, and determine the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve as the initial duty ratio of the other target proportional valve. This can enable the target proportional valve and the other target proportional valve to quickly skip the dead zone during the switching process, improve the hydrogen pressure build-up response speed, avoid delay and hysteresis, and thus improve the accuracy of switching.

[0079] It can be understood that the dead zone refers to the situation where, when a tool or equipment is performing a processing task, although it moves, no actual substantial processing operation is carried out.

[0080] Among them, one of the embodiments provided in this application: when the above-mentioned target proportional valve is a low-power proportional valve, the other target proportional valve is specifically a high-power proportional valve; Embodiment two provided in this application: when the above-mentioned target proportional valve is a high-power proportional valve, the other target proportional valve is specifically a low-power proportional valve.

[0081] The control method of the dual proportional valve in the fuel cell system provided by the embodiment of the present application, compared with the prior art, the embodiment provided by the present application determines the target operating state of the fuel cell system to be detected based on the target operating power of the fuel cell system to be detected within a preset time period, and for any target operating state, based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, it is determined whether it is necessary to switch the target proportional valve that is operating in the current target operating state. When it is not necessary to switch the target proportional valve, based on the preset duty ratio algorithm, the target output duty ratio corresponding to the target proportional valve is determined to complete the opening control of the target proportional valve. When it is necessary to switch the target proportional valve, based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, the switching duty ratio of the target proportional valve is determined, and based on the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after the switching, the switching initial duty ratio of the other target proportional valve is determined to complete the switching between the target proportional valve and the other target proportional valve. The embodiment provided by the present application reflects the current threshold for controlling the target proportional valve adjustment in the form of a duty ratio threshold. Without increasing the cost of the controller hardware in the fuel cell system to be detected, precise control of the target proportional valve is achieved through the duty ratio. While improving the switching accuracy of the target proportional valve, the hysteresis during the switching of the target proportional valve is reduced, thereby avoiding overshoot or undervoltage fluctuations in the hydrogen pressure on the anode side of the fuel cell stack, reducing the probability of single low failures of the fuel cell stack, and extending the service life of the fuel cell to be detected.

[0082] Moreover, the embodiment provided by the present application can make the fuel cell system to be detected with dual injection and dual target proportional valves maintain relatively stable hydrogen pressure on the anode side (critical power section) at different operating temperatures and different medium hydrogen pressures, and enable the overshoot or undervoltage of the gas pressure to be controlled within an acceptable range of the fuel cell stack, enabling the fuel cell stack to operate normally and improving the service life of the fuel cell system to be detected.

[0083] In one embodiment, the target proportional valve includes a low-power proportional valve and a high-power proportional valve. Step S102 includes the following sub-steps:

[0084] Sub-step 1021: Determine the first ratio between the first actual duty ratio of the low-power proportional valve and the first preset start-stop critical threshold duty ratio, or determine the second ratio between the second actual duty ratio of the high-power proportional valve and the preset start-stop critical threshold duty ratio.

[0085] In this step, when facing different target operating states and wanting to determine whether it is necessary to switch the target proportional valve that is operating under the current target operating state, it is first necessary to determine whether the first ratio between the first actual duty cycle of the low-power proportional valve in the target proportional valve and the first preset start-stop critical threshold duty cycle is 1, or to determine whether the second ratio between the second actual duty cycle of the high-power proportional valve and the preset start-stop critical threshold duty cycle is 1. If any of the two ratios is not 1, it means that the low-power proportional valve or the high-power proportional valve has not reached the switching critical value, and at this time, the target proportional valve that is operating under the target operating state is not switched.

[0086] Sub-step 1022: When the first ratio or the second ratio is 1, determine whether there is a difference between the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected under the current target operating state.

[0087] In this step, when facing different target operating states, when it is determined that the first ratio or the second ratio is 1, determine the difference H2_PErr = H2_PDmd - H2_PStkIn between the target hydrogen pressure and the actual hydrogen pressure under this target operating state.

[0088] Sub-step 1022: If there is a difference and the difference is greater than zero, determine that it is necessary to switch the low-power proportional valve that is operating under the current target operating state to a high-power proportional valve.

[0089] In this step, when it is determined that the first ratio or the second ratio is 1, and there is a difference H2_PErr, and the difference H2_PErr is greater than zero, it is determined that the target hydrogen pressure has increased. At this time, the low-power proportional valve that is operating under the target operating state has reached the low-ratio valve opening limit threshold Duty_HGI1OpenLimtThrd. At this time, it is determined that it is necessary to switch the low-power proportional valve that is operating under the current target operating state to a high-power proportional valve. Specifically, it can be but is not limited to: adjusting the low-power proportional valve to the lock flag position 1 and adjusting the high-power proportional valve to the closed flag position 0.

[0090] Sub-step 1023: If there is a difference and the difference is less than zero, determine that it is necessary to switch the high-power proportional valve that is operating under the current target operating state to a low-power proportional valve.

[0091] In this step, when it is determined that the first ratio or the second ratio is 1, there is a difference H2_PErr, and the difference H2_PErr is less than zero, it is determined that the target hydrogen pressure drops. At this time, the high-power proportional valve operating in the current target operating state reaches the high-power proportional valve closing threshold Duty_HGI2CloseThrd. At this time, it is determined that it is necessary to switch the high-power proportional valve operating in the current target operating state to a low-power proportional valve. Specifically, it can be but is not limited to: adjusting the high-power proportional valve to the locked flag position 1 and adjusting the low-power proportional valve to the closed flag position 0.

[0092] Sub-step 1024: If not, it is determined that there is no need to switch the high-power proportional valve / low-power proportional valve operating in the current target operating state.

[0093] In this step, if there is no difference H2_PErr, it means that the current target operating state is the high-power operating state under the high-power proportional valve, the low-power operating state under the low-power proportional valve, or the initial startup state of the fuel cell system to be detected.

[0094] In one embodiment, if there is no need to switch the target proportional valve, based on a preset duty ratio algorithm, the target output duty ratio corresponding to the target proportional valve is determined to complete the opening control of the target proportional valve, including:

[0095] If there is no need to switch the low-power proportional valve, based on the first preset duty ratio algorithm, the first target output duty ratio of the low-power proportional valve is determined to complete the opening control of the low-power proportional valve. Among them, the first preset duty ratio algorithm is determined based on the first preset proportional integral coefficient, the target hydrogen pressure in the current target operating state, and the actual hydrogen pressure.

[0096] As mentioned above, assuming that the embodiment provided in this application does not require switching of the low-power proportional valve, at this time, according to the first preset duty ratio algorithm, the formula for determining the first target output duty ratio of the low-power proportional valve is specifically:

[0097] ;

[0098] Among them, and both are used to represent different preset proportional integral coefficients, and the embodiments provided in this application can be but are not limited to applying different PI parameters to the target proportional valves of different types of manufacturers.

[0099] It can be understood that when the fuel cell system to be detected is in the low-power operation stage and the small proportional valve can meet the hydrogen pressure demand at this time, the duty cycle calculated by the small-power proportional valve PI is used as the first target output duty cycle. At this time, the small-power proportional valve is adjusted to the locked flag position 0, and the large-power proportional valve is adjusted to the closed flag position 1, and the second target output duty cycle corresponding to the large-power proportional valve is determined to be 0.

[0100] In one embodiment, it is assumed that the first preset start-stop critical threshold duty cycle in the embodiment provided by the present application includes the small proportional valve opening limit threshold duty cycle, and the second preset start-stop critical threshold duty cycle includes the large proportional valve opening threshold duty cycle. At this time, if it is necessary to switch the target proportional valve, then based on the first preset start-stop critical threshold duty cycle corresponding to the target proportional valve, the switching duty cycle of the target proportional valve is determined, and based on the second preset start-stop critical threshold duty cycle corresponding to the other target proportional valve after switching, the switching initial duty cycle of the other target proportional valve is determined, so as to complete the switching between the target proportional valve and the other target proportional valve, including:

[0101] If it is necessary to switch the small-power proportional valve to the large-power proportional valve, then based on the small proportional valve opening limit threshold duty cycle corresponding to the small-power proportional valve, the switching duty cycle of the small-power proportional valve is determined, and based on the large proportional valve opening threshold duty cycle corresponding to the large-power proportional valve after switching, the switching initial duty cycle of the large-power proportional valve is determined, so as to complete the switching of the small-power proportional valve to the large-power proportional valve.

[0102] In one embodiment, if it is not necessary to switch the target proportional valve, then based on the preset duty cycle algorithm, the target output duty cycle corresponding to the target proportional valve is determined, so as to complete the opening control of the target proportional valve, and it further includes:

[0103] If it is not necessary to switch the large-power proportional valve, then based on the second preset duty cycle algorithm, the second target output duty cycle of the large-power proportional valve is determined, so as to complete the opening control of the large-power proportional valve, where the second preset duty cycle algorithm is determined based on the second preset proportional integral coefficient, the target hydrogen pressure under the current target operating state, and the actual hydrogen pressure.

[0104] In the above, it is assumed that the embodiment provided by the present application does not need to switch the large-power proportional valve. At this time, according to the second preset duty cycle algorithm, the formula for determining the second target output duty cycle of the large-power proportional valve is specifically:

[0105] ;

[0106] Wherein, and They are all used to represent different preset proportional-integral coefficients, and the embodiments provided in this application can, but are not limited to, be applied to the target proportional valves of different types of manufacturers by setting different PI parameters.

[0107] It can be understood that when the fuel cell system to be detected is in the high-power operation stage and the large proportional valve can meet the hydrogen pressure demand at this time, the duty cycle calculated by the small-power proportional valve PI is used as the second target output duty cycle. At this time, the large-power proportional valve is adjusted to the locked flag position 0, and the small-power proportional valve is adjusted to the closed flag position 1, and it is determined that the first target output duty cycle corresponding to the small-power proportional valve is 0.

[0108] In one embodiment, it is assumed that the first preset start-stop critical threshold duty cycle provided in the embodiments of this application includes the large proportional valve closing threshold duty cycle, and the second preset start-stop critical threshold duty cycle includes the small proportional valve closing limit threshold duty cycle. If it is necessary to switch the target proportional valve, then based on the first preset start-stop critical threshold duty cycle corresponding to the target proportional valve, the switching duty cycle of the target proportional valve is determined, and based on the second preset start-stop critical threshold duty cycle corresponding to the other target proportional valve after switching, the switching initial duty cycle of the other target proportional valve is determined, so as to complete the switching between the target proportional valve and the other target proportional valve. It also includes:

[0109] If it is necessary to switch the large-power proportional valve to the small-power proportional valve, then based on the large proportional valve closing threshold duty cycle Duty_HGI2CloseThrd corresponding to the large-power proportional valve, the switching duty cycle of the large-power proportional valve is determined, and based on the small proportional valve closing limit threshold duty cycle Duty_HGI1CloseLimtThrd corresponding to the small-power proportional valve after switching, the switching initial duty cycle of the small-power proportional valve after switching is determined, and the output is adjusted in real time to complete the switching of the large-power proportional valve to the small-power proportional valve again.

[0110] In one embodiment, for any target operating state, based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, it is determined whether it is necessary to switch the target proportional valve that is operating in the current target operating state. It also includes:

[0111] When the fuel cell system to be detected is in the initial startup state, it is determined that both the target hydrogen pressure and the actual hydrogen pressure are zero, and based on the small proportional valve opening threshold duty cycle, the small proportional valve is controlled to open.

[0112] In the above, when the fuel cell system to be detected is in the initial startup state and the hydrogen subsystem enable flag bit is received as 1, at this time, the PI control integral value of the low-power proportional valve is switched to the duty ratio Duty_HGI1OpenThrd of the small proportional valve opening threshold, so that the PI calculated value quickly skips the dead zone and improves the hydrogen pressure building response speed.

[0113] In the control method of the dual proportional valve in the fuel cell system provided by the embodiment of the present application, compared with the prior art, the embodiment provided by the present application determines the target operating state of the fuel cell system to be detected based on the target operating power of the fuel cell system to be detected within a preset time period, and for any target operating state, based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, determines whether it is necessary to switch the target proportional valve that is operating in the current target operating state, and when it is not necessary to switch the target proportional valve, determines the target output duty ratio corresponding to the target proportional valve based on a preset duty ratio algorithm, so as to complete the opening control of the target proportional valve, and when it is necessary to switch the target proportional valve, determines the switching duty ratio of the target proportional valve based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, and determines the initial switching duty ratio of the other target proportional valve based on the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after the switching, so as to complete the switching between the target proportional valve and the other target proportional valve. The embodiment provided by the present application reflects the current threshold for controlling the adjustment of the target proportional valve in the form of a duty ratio threshold. Without increasing the cost of the controller hardware in the fuel cell system to be detected, accurate control of the operation of the target proportional valve is achieved through the duty ratio, while improving the switching accuracy of the target proportional valve, reducing the hysteresis of the target proportional valve during switching, thereby avoiding overshoot or underpressure fluctuations in the hydrogen pressure on the anode side of the fuel cell stack, reducing the probability of single low failures of the fuel cell stack, and extending the service life of the fuel cell to be detected.

[0114] Moreover, the embodiments provided in this application use dual PI controllers to control a low-power proportional valve and a high-power proportional valve respectively, achieving seamless connection between target proportional valves. During the process of switching from the low-power proportional valve to the high-power proportional valve, the high-power proportional valve can directly intervene with the duty ratio of the high-power valve opening threshold, avoiding undervoltage caused by no-load stroke calculation and pressure overshoot caused by sudden intervention with a larger duty ratio. During the process of switching from the high-power proportional valve to the low-power proportional valve, the low-power proportional valve can intervene with the duty ratio of the low-power valve closing limit threshold, avoiding pressure overshoot caused by no-load stroke calculation and undervoltage caused by intervention with a smaller duty ratio. That is, the embodiments provided in this application can keep the hydrogen pressure on the anode side relatively stable (critical power section) in a fuel cell system to be detected with dual ejectors and dual target proportional valves at different operating temperatures and different medium hydrogen pressures, and control the overshoot or undervoltage of the gas pressure within the acceptable range of the stack, enabling the stack to operate normally and improving the service life of the fuel cell system to be detected.

[0115] Please refer to Figure 5 , Figure 5 which is a structural block diagram of a control device for dual proportional valves in a fuel cell system provided by an embodiment of this application. As Figure 5 shown, the control device 500 for dual proportional valves in a fuel cell system includes:

[0116] A first determination module 510, configured to determine the target operating state of the fuel cell system to be detected based on the target operating power of the fuel cell system to be detected within a preset time period.

[0117] A second determination module 520, configured to, for any target operating state, determine whether it is necessary to switch the target proportional valve that is operating in the current target operating state based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, where there are two target proportional valves for mutual switching in the fuel cell system to be detected.

[0118] A third determination module 530, configured to, if it is not necessary to switch the target proportional valve, determine the target output duty ratio corresponding to the target proportional valve based on a preset duty ratio algorithm, so as to complete the opening control of the target proportional valve.

[0119] A fourth determination module 540, configured to, if it is necessary to switch the target proportional valve, determine the switching duty ratio of the target proportional valve based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, and determine the initial switching duty ratio of the other target proportional valve based on the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after switching, so as to complete the switching between the target proportional valve and the other target proportional valve.

[0120] In one embodiment, the target proportional valve includes a low-power proportional valve and a high-power proportional valve. The first determination module 510 is specifically configured to:

[0121] For any target operating state, determine a first ratio between the first actual duty cycle of the low-power proportional valve and the first preset start-stop critical threshold duty cycle, or determine a second ratio between the second actual duty cycle of the high-power proportional valve and the preset start-stop critical threshold duty cycle;

[0122] When the first ratio or the second ratio is 1, determine whether there is a difference between the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state.

[0123] If there is a difference and the difference is greater than zero, determine that it is necessary to switch the low-power proportional valve that is operating in the current target operating state to a high-power proportional valve.

[0124] If there is a difference and the difference is less than zero, determine that it is necessary to switch the high-power proportional valve that is operating in the current target operating state to a low-power proportional valve.

[0125] If there is no difference, determine that it is not necessary to switch the high-power proportional valve / low-power proportional valve that is operating in the current target operating state.

[0126] In one embodiment, the second determination module 520 is specifically configured to:

[0127] If it is not necessary to switch the low-power proportional valve, determine the first target output duty cycle of the low-power proportional valve based on the first preset duty cycle algorithm to complete the opening control of the low-power proportional valve, where the first preset duty cycle algorithm is determined based on the first preset proportional-integral coefficient, the target hydrogen pressure, and the actual hydrogen pressure in the current target operating state.

[0128] In one embodiment, the first preset start-stop critical threshold duty cycle includes the small proportional valve opening limit threshold duty cycle, and the second preset start-stop critical threshold duty cycle includes the large proportional valve opening threshold duty cycle. If it is necessary to switch the target proportional valve, determine the switching duty cycle of the target proportional valve based on the first preset start-stop critical threshold duty cycle corresponding to the target proportional valve, and determine the switching initial duty cycle of the other target proportional valve based on the second preset start-stop critical threshold duty cycle corresponding to the other target proportional valve after switching, so as to complete the switching between the target proportional valve and the other target proportional valve, including:

[0129] If it is necessary to switch the low-power proportional valve to a high-power proportional valve, determine the switching duty cycle of the low-power proportional valve based on the small proportional valve opening limit threshold duty cycle corresponding to the low-power proportional valve.

[0130] And determine the initial duty ratio of the high-power proportional valve based on the duty ratio of the high-proportion valve opening threshold corresponding to the switched high-power proportional valve, so as to complete the switching from the low-power proportional valve to the high-power proportional valve.

[0131] In one embodiment, the third determination module 530 is specifically configured to:

[0132] If there is no need to switch the high-power proportional valve, determine the second target output duty ratio of the high-power proportional valve based on the second preset duty ratio algorithm, so as to complete the opening control of the high-power proportional valve, where the second preset duty ratio algorithm is determined based on the second preset proportional integral coefficient, the target hydrogen pressure under the current target operating state, and the actual hydrogen pressure.

[0133] In one embodiment, the first preset start-stop critical threshold duty ratio includes the duty ratio of the large proportional valve closing threshold, and the second preset start-stop critical threshold duty ratio includes the duty ratio of the small proportional valve closing limit threshold. If it is necessary to switch the target proportional valve, determine the switching duty ratio of the target proportional valve based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, and determine the initial switching duty ratio of the other target proportional valve based on the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after switching, so as to complete the switching between the target proportional valve and the other target proportional valve. It also includes:

[0134] If it is necessary to switch the high-power proportional valve to a low-power proportional valve, determine the switching duty ratio of the high-power proportional valve based on the duty ratio of the large proportional valve closing threshold corresponding to the high-power proportional valve.

[0135] And determine the initial switching duty ratio of the switched low-power proportional valve based on the duty ratio of the small proportional valve closing limit threshold corresponding to the switched low-power proportional valve, so as to complete the switching of the high-power proportional valve back to the low-power proportional valve.

[0136] In one embodiment, the fourth determination module 540 is specifically configured to:

[0137] When the fuel cell system to be detected is in the initial startup state, determine that both the target hydrogen pressure and the actual hydrogen pressure are zero, and control the small proportional valve to open based on the duty ratio of the small proportional valve opening threshold.

[0138] The control device 500 of the dual proportional valve in the fuel cell system provided by the embodiment of the present application, compared with the prior art, determines the target operating state of the fuel cell system to be detected based on the target operating power of the fuel cell system to be detected within a preset time period. For any target operating state, it determines whether it is necessary to switch the target proportional valve operating in the current target operating state based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state. When it is not necessary to switch the target proportional valve, it determines the target output duty ratio corresponding to the target proportional valve based on a preset duty ratio algorithm to complete the opening control of the target proportional valve. When it is necessary to switch the target proportional valve, it determines the switching duty ratio of the target proportional valve based on the first preset start-stop critical threshold duty ratio corresponding to the target proportional valve, and determines the initial switching duty ratio of the other target proportional valve based on the second preset start-stop critical threshold duty ratio corresponding to the other target proportional valve after switching to complete the switching between the target proportional valve and the other target proportional valve. The embodiment provided by the present application reflects the current threshold for controlling the adjustment of the target proportional valve in the form of a duty ratio threshold. Without increasing the cost of the controller hardware in the fuel cell system to be detected, it realizes precise control of the operation of the target proportional valve through the duty ratio, improves the switching accuracy of the target proportional valve, reduces the hysteresis of the target proportional valve during switching, thereby avoiding overshoot or underpressure fluctuations in the hydrogen pressure on the anode side of the fuel cell stack, reducing the probability of single low faults in the fuel cell stack, and extending the service life of the fuel cell system to be detected.

[0139] The embodiment provided by the present application uses dual PI controllers to control the low-power proportional valve and the high-power proportional valve respectively to achieve seamless connection between the target proportional valves. During the process of switching from the low-power proportional valve to the high-power proportional valve, the large proportional valve can directly intervene with the opening threshold duty ratio of the large proportional valve to avoid underpressure caused by the dead zone calculation and pressure overshoot caused by the sudden intervention of a larger duty ratio. During the process of switching the power proportional valve to the low-power proportional valve, the small proportional valve can intervene with the closing limit threshold duty ratio of the small proportional valve to avoid pressure overshoot caused by the dead zone calculation and underpressure caused by the intervention of a smaller duty ratio. That is, the embodiment provided by the present application can keep the hydrogen pressure on the anode side relatively stable (critical power section) in the fuel cell system to be detected with dual injection and dual target proportional valves at different operating temperatures and different medium hydrogen pressures, and control the overshoot or underpressure of the gas pressure within the acceptable range of the fuel cell stack, enabling the fuel cell stack to work normally and improving the service life of the fuel cell system to be detected.

[0140] Please refer to Figure 6 , Figure 6 which shows the structural schematic diagram of an electronic device provided by the embodiment of the present application, as Figure 6As shown, the electronic device 600 includes a processor 610, a memory 620, and a bus 630.

[0141] The memory 620 stores machine-readable instructions executable by the processor 610. When the electronic device 600 runs, the processor 610 communicates with the memory 620 via the bus 630. When the machine-readable instructions are executed by the processor 610, the steps of the control method of the dual proportional valve in the fuel cell system in the method embodiment as described above can be executed. For the specific implementation manner, reference can be made to the method embodiment, which will not be elaborated here. Figures 1 to 4 As shown, the steps of the control method of the dual proportional valve in the fuel cell system in the method embodiment as described above can be executed. For the specific implementation manner, reference can be made to the method embodiment, which will not be elaborated here.

[0142] The embodiment of the present application also provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is run by a processor, the steps of the control method of the dual proportional valve in the fuel cell system in the method embodiment as described above can be executed. For the specific implementation manner, reference can be made to the method embodiment, which will not be elaborated here. Figures 1 to 4 As shown, the steps of the control method of the dual proportional valve in the fuel cell system in the method embodiment as described above can be executed. For the specific implementation manner, reference can be made to the method embodiment, which will not be elaborated here.

[0143] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, which will not be elaborated here.

[0144] It should be noted that in the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0145] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-readable program codes.

[0146] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowcharts and / or block diagrams, and the combination of processes and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded computers, or other programmable data processing devices to generate a machine, so that the instructions executed by the processors of the computer or other programmable data processing devices generate for implementing in the process Figure 1 one process or multiple processes and / or blocks Figure 1means for the functions specified in one or more boxes.

[0147] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction device that implements the functions specified in one Figure 1 one process or more processes and / or boxes Figure 1 means for the functions specified in one or more boxes.

[0148] These computer program instructions may also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are performed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one Figure 1 one process or more processes and / or boxes Figure 1 means for the functions specified in one or more boxes.

[0149] The embodiment of the present application also provides a computer program product, which includes computer software instructions. When the computer software instructions run on a processing device, the processing device is caused to execute the process of the control method of the dual proportional valve in the fuel cell system.

[0150] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that a computer can store, or a data storage device such as a server or data center that includes one or more integrated available media. The available medium may be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0151] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0152] In several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0153] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0154] In addition, each functional unit in various embodiments of the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0155] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0156] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

[0157] Although the preferred embodiments of this specification have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of this specification.

[0158] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalent technologies, this specification is also intended to include these modifications and variations.

Claims

1. A control method for a dual proportional valve in a fuel cell system, characterized in that: The control method of the dual proportional valve in the fuel cell system comprises: Determining a target operating state of the fuel cell system to be detected based on a target operating power of the fuel cell system to be detected within a preset time period; For any of the target operating states, based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be tested under the current target operating state, determining whether it is necessary to switch the target proportional valve that is operating under the current target operating state, wherein the fuel cell system to be tested includes two target proportional valves for switching with each other; If the target proportional valve does not need to be switched, a target output duty cycle corresponding to the target proportional valve is determined based on a preset duty cycle algorithm, so as to complete the opening control of the target proportional valve; If the target proportional valve needs to be switched, the switching duty ratio of the target proportional valve is determined based on the first preset start / stop critical threshold duty ratio corresponding to the target proportional valve, and the switching initial duty ratio of the other target proportional valve is determined based on the second preset start / stop critical threshold duty ratio corresponding to the other target proportional valve after switching, so as to complete the switching between the target proportional valve and the other target proportional valve; The target proportional valve includes a low-power proportional valve and a high-power proportional valve. For any of the target operating states, based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, determining whether it is necessary to switch the target proportional valve in operation in the current target operating state includes: For any target operating state, determining a first ratio between a first actual duty cycle of a low-power proportional valve and a first preset start-stop critical threshold duty cycle, or determining a second ratio between a second actual duty cycle of a high-power proportional valve and a preset start-stop critical threshold duty cycle; When the first ratio or the second ratio is 1, determining whether there is a difference between the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be tested under the current target operating state; If yes, and the difference is greater than zero, it is determined that the low-power proportional valve currently in operation under the current target operating state needs to be switched to a high-power proportional valve; If yes, and the difference is less than zero, it is determined that the high-power proportional valve currently in operation under the current target operating state needs to be switched to a low-power standard proportional valve; If not, it is determined that there is no need to switch the high-power proportional valve or the low-power proportional valve that is running in the current target operating state.

2. The control method of the dual proportional valve in the fuel cell system according to claim 1, characterized in that: If the target proportional valve does not need to be switched, the target output duty cycle corresponding to the target proportional valve is determined based on a preset duty cycle algorithm to complete the opening control of the target proportional valve, including: If there is no need to switch the low-power proportional valve, the first target output duty cycle of the low-power proportional valve is determined based on a first preset duty cycle algorithm to complete the opening control of the low-power proportional valve, wherein the first preset duty cycle algorithm is determined based on a first preset proportional-integral coefficient, the target hydrogen pressure under the current target operating state, and the actual hydrogen pressure.

3. The control method of the dual proportional valve in the fuel cell system according to claim 1, characterized in that: The first preset start-stop critical threshold duty cycle includes a small proportional valve opening limit threshold duty cycle, the second preset start-stop critical threshold duty cycle includes a large proportional valve opening threshold duty cycle, and if the target proportional valve needs to be switched, the switching duty cycle of the target proportional valve is determined based on the first preset start-stop critical threshold duty cycle corresponding to the target proportional valve, and the initial switching duty cycle of the other target proportional valve is determined based on the second preset start-stop critical threshold duty cycle corresponding to the other target proportional valve after switching, so as to complete the switching between the target proportional valve and the other target proportional valve, including: If the low-power proportional valve needs to be switched to a high-power proportional valve, the switching duty cycle of the low-power proportional valve is determined based on the duty cycle of the small-proportional valve opening limit threshold corresponding to the low-power proportional valve; And based on the large proportional valve opening threshold duty ratio corresponding to the switched high-power proportional valve, the initial switching duty ratio of the high-power proportional valve is determined to complete the switching of the low-power proportional valve to the high-power proportional valve.

4. The control method of the dual proportional valve in the fuel cell system according to claim 2, characterized in that: If the target proportional valve does not need to be switched, the target output duty cycle corresponding to the target proportional valve is determined based on a preset duty cycle algorithm to complete the opening control of the target proportional valve, and further includes: If the high-power proportional valve does not need to be switched, the second target output duty cycle of the high-power proportional valve is determined based on a second preset duty cycle algorithm to complete the opening control of the high-power proportional valve, wherein the second preset duty cycle algorithm is determined based on a second preset proportional-integral coefficient, the target hydrogen pressure under the current target operating state, and the actual hydrogen pressure.

5. The control method of the dual proportional valve in the fuel cell system according to claim 3, characterized in that: The first preset start-stop critical threshold duty cycle includes a large proportional valve closing threshold duty cycle, the second preset start-stop critical threshold duty cycle includes a small proportional valve closing limit threshold duty cycle, if the target proportional valve needs to be switched, the switching duty cycle of the target proportional valve is determined based on the first preset start-stop critical threshold duty cycle corresponding to the target proportional valve, and the initial switching duty cycle of the other target proportional valve is determined based on the second preset start-stop critical threshold duty cycle corresponding to the other target proportional valve after switching, so as to complete the switching between the target proportional valve and the other target proportional valve, and further includes: If it is necessary to switch the high-power proportional valve to a low-power proportional valve, the switching duty cycle of the high-power proportional valve is determined based on the large-proportional valve closing threshold duty cycle corresponding to the high-power proportional valve; And based on the small proportional valve closing limit threshold duty cycle corresponding to the switched small power proportional valve, the initial switching duty cycle of the switched small power proportional valve is determined to complete the switching of the high power proportional valve to the small power proportional valve again.

6. The control method of the dual proportional valve in the fuel cell system according to claim 1, characterized in that: For any of the target operating states, determining whether it is necessary to switch the target proportional valve in operation under the current target operating state based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected under the current target operating state, further comprising: When the fuel cell system to be detected is in an initial startup state, it is determined that the target hydrogen pressure and the actual hydrogen pressure are both zero, and the small proportional valve is controlled to open based on the small proportional valve opening threshold duty cycle.

7. A control device for a dual proportional valve in a fuel cell system, characterized in that: The control device of the dual proportional valve in the fuel cell system comprises: A first determination module, configured to determine a target operating state of the fuel cell system to be detected based on a target operating power of the fuel cell system to be detected within a preset time period; A second determination module is used to determine, for any of the target operating states, whether it is necessary to switch the target proportional valve that is operating in the current target operating state based on the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be detected in the current target operating state, wherein the fuel cell system to be detected includes two target proportional valves for switching with each other; A third determination module is used to determine the target output duty cycle corresponding to the target proportional valve based on a preset duty cycle algorithm if the target proportional valve does not need to be switched, so as to complete the opening control of the target proportional valve; a fourth determination module, for determining, if it is necessary to switch the target proportional valve, a switching duty ratio of the target proportional valve based on a first preset start / stop critical threshold duty ratio corresponding to the target proportional valve, and determining an initial switching duty ratio of the other target proportional valve based on a second preset start / stop critical threshold duty ratio corresponding to the other target proportional valve after switching, so as to complete the switching between the target proportional valve and the other target proportional valve; The target proportional valve includes a low-power proportional valve and a high-power proportional valve, and the first determining module is specifically used for: For any target operating state, determining a first ratio between a first actual duty cycle of a low-power proportional valve and a first preset start-stop critical threshold duty cycle, or determining a second ratio between a second actual duty cycle of a high-power proportional valve and a preset start-stop critical threshold duty cycle; When the first ratio or the second ratio is 1, determining whether there is a difference between the target hydrogen pressure and the actual hydrogen pressure of the fuel cell system to be tested under the current target operating state; If yes, and the difference is greater than zero, it is determined that the low-power proportional valve currently in operation under the current target operating state needs to be switched to a high-power proportional valve; If yes, and the difference is less than zero, it is determined that the high-power proportional valve currently in operation under the current target operating state needs to be switched to a low-power standard proportional valve; If not, it is determined that there is no need to switch the high-power proportional valve or the low-power proportional valve that is running in the current target operating state.

8. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate via the bus, and the machine-readable instructions are executed by the processor to execute the steps of the control method of the dual proportional valve in the fuel cell system as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for controlling a dual proportional valve in a fuel cell system as described in any one of claims 1 to 6 are executed.

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