Control method and device for double proportional valves in fuel cell system

Abstract

The invention discloses a control method and device for double proportional valves in a fuel cell system, and relates to the technical field of fuel cells. Determining whether a target proportional valve which is running in the current target running state needs to be switched or not; and 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. According to the embodiment provided by the invention, the switching accuracy of the target proportional valve is improved, and meanwhile, the hysteresis of the target proportional valve during switching is reduced, so that the overshoot or undervoltage fluctuation of the hydrogen pressure on the anode side of the electric pile is avoided, the probability of single-low fault of the electric pile is reduced, and the service life of the fuel cell to be detected is prolonged.

Description

Technical Field

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

[0002] At present, with the development of society and the advancement of science and technology, fuel cell systems are being used more and more widely in new energy vehicles. However, with the deepening of applications, current fuel cell systems are facing many challenges in terms of efficiency improvement and cost reduction. In addition, ejectors are often used on the market to replace hydrogen from hydrogen pumps. In particular, high-power fuel cell systems require the use of a large and a small double ejector to meet the hydrogen flow requirements of different power ranges.

[0003] However, in some special power ranges, 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 corresponding hydrogen flow demand in the 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 demand in the fuel cell system, and a large proportional valve needs to be switched, when it is necessary to switch the proportional valve in the fuel cell system, the environmental impact under different hydrogen flow rates is relatively large, which may cause the hydrogen flow to be advanced or delayed during the switching of the proportional valve, thereby reducing the switching accuracy. Regardless of whether the proportional valve is switched in advance or delayed, the hydrogen pressure on the anode side of the stack will cause overshoot or undervoltage fluctuations, which may seriously cause a single low fault in the stack, thereby shortening 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 in the prior art of poor switching accuracy, single low failure in the fuel cell stack and short service life of the fuel cell. 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 overshoot or undervoltage fluctuations in the hydrogen pressure on the anode side of the fuel cell stack, reducing the probability of single low failure in the fuel cell stack, and extending the service life of the fuel cell to be tested.

[0005] In a first aspect of an embodiment of the present application, an embodiment of the present application provides a control method for a dual proportional valve in a fuel cell system, the control method for a dual proportional valve in a fuel cell system comprising: 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 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.

[0006] In a feasible implementation manner, the target proportional valve includes a low-power proportional valve and a high-power proportional valve, and 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 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 / low-power proportional valve currently running in the current target operating state.

[0007] In a feasible implementation manner, 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.

[0008] In a feasible implementation manner, 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.

[0009] In a feasible implementation manner, 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.

[0010] In a feasible implementation manner, the first preset start-stop critical threshold duty ratio includes a large proportional valve closing threshold duty ratio, the second preset start-stop critical threshold duty ratio includes a small proportional valve closing limit threshold duty ratio, and 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 initial switching 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, 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.

[0011] In a feasible implementation manner, 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 includes: 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.

[0012] In a 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 a dual proportional valve in the fuel cell system comprising: 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; The fourth determination module is used to 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 if it is necessary to switch the target proportional valve, and to determine the initial switching 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.

[0013] According to a third aspect of an embodiment of the present application, an electronic device is provided, comprising: 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 communicates with the memory via the bus, and the machine-readable instructions are executed by the processor when running, such as the steps of the control method of the dual proportional valve in the fuel cell system mentioned above.

[0014] In a fourth aspect of the embodiments of the present application, the embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method of the dual proportional valve in the fuel cell system as described above are executed.

[0015] The control method and device for the dual proportional valve in the fuel cell system provided in the embodiment of the present application, compared with the prior art, the embodiment provided in 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, determines whether it is necessary to switch the target proportional valve running 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, and when it is not necessary to switch the target proportional valve, determines the target output duty cycle corresponding to the target proportional valve based on a preset duty cycle algorithm to complete the opening control of the target proportional valve, and when it is necessary to switch the target proportional valve, determines the target output duty cycle corresponding to the target proportional valve based on the first preset start-stop critical threshold corresponding to the target proportional valve. Duty cycle, determine the switching duty cycle of the target proportional valve, and based on the second preset start-stop critical threshold duty cycle corresponding to the other target proportional valve after switching, determine the initial switching duty cycle of the other target proportional valve, so as to complete the switching between the target proportional valve and the other target proportional valve. The embodiment provided in the present application embodies the current threshold for controlling the adjustment of the target proportional valve in the form of a duty cycle threshold. Without increasing the cost of the controller hardware in the fuel cell system to be tested, the duty cycle is used to accurately control the operation of the target proportional valve. While improving the switching accuracy of the target proportional valve, the lag of the target proportional valve during switching is reduced, thereby avoiding overshoot or undervoltage fluctuations in the hydrogen pressure on the anode side of the stack, reducing the probability of single low failure in the stack, and extending the service life of the fuel cell to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flowchart of a method for controlling a dual proportional valve in a fuel cell system provided by an embodiment of the present application is shown; Figure 2 A schematic diagram of operating characteristic curves of each target proportional valve in a control method for dual proportional valves in a fuel cell system provided by an embodiment of the present application is shown; Figure 3 A schematic diagram of a resistance characteristic curve of any target proportional valve in a fuel cell system provided by an embodiment of the present application at different temperatures is shown; Figure 4 A schematic diagram of a resistance characteristic curve of any target proportional valve in a fuel cell system provided by an embodiment of the present application at different temperatures is shown; Figure 5 A structural block diagram of a control device for a dual proportional valve in a fuel cell system provided by an embodiment of the present application is shown; Figure 6 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown.

[0017] Figure 5 and Figure 6 The corresponding relationship between the reference numerals and the names of the drawings is as follows: 500 Control device for dual proportional valve in fuel cell system; 510 First determination module; 520 Second determination module; 530 Third determination module; 540 Fourth determination module; 600 Electronic device; 610 Processor; 620 Memory; 630 Bus. DETAILED DESCRIPTION

[0018] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in 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. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0019] In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0020] First, the applicable application scenarios of the present application are introduced. The embodiments provided in the present application are applicable to the field of fuel cell technology.

[0021] At present, in some special power ranges, 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 corresponding hydrogen flow demand in the 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 has far exceeded the hydrogen flow demand in the fuel cell system, and a large proportional valve needs to be switched, when the proportional valve in the fuel cell system needs to be switched, the environmental impact under different hydrogen flow rates is relatively large, which may cause the hydrogen flow to be advanced or delayed during the switching of the proportional valve, thereby reducing the accuracy of the switching. Regardless of whether the proportional valve is switched in advance or delayed, the hydrogen pressure on the anode side of the stack will cause overshoot or undervoltage fluctuations, which may seriously cause a single low fault in the stack, thereby shortening the service life of the fuel cell.

[0022] 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 in the prior art of poor switching accuracy, single low failure in the fuel cell stack and short service life of the fuel cell. The embodiments provided by the present application improve the switching accuracy of the target proportional valve while reducing the lag of the target proportional valve during switching, 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 failure in the fuel cell stack, and extending the service life of the fuel cell to be tested.

[0023] See also Figure 1 , Figure 1 A flowchart of a control method for a dual proportional valve in a fuel cell system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the control method of the dual proportional valve in the fuel cell system includes the following steps: S101 . Determine a target operating state of a 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.

[0024] In this step, it is assumed that the target operating power of the embodiment provided by the present application in different preset time periods corresponds to different target operating states, wherein different operating states can be adaptively adjusted according to different application scenarios. It is assumed that the target operating states in the embodiment 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 switching post-operating state, 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.

[0025] It can be understood that under different operating powers, it is assumed that the opening degrees of different target proportional valves in the embodiments provided in the present application are different.

[0026] S102. For any target operating state, based on the target hydrogen pressure and actual hydrogen pressure of the fuel cell system to be tested 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, wherein the fuel cell system to be tested includes two target proportional valves for switching with each other.

[0027] In this step, after determining 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 small-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, and 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 under 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).

[0028] 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.

[0029] It can be understood that before judging whether it is necessary to switch the target proportional valve in operation under the target operating state, the embodiment provided by the present application first needs to test the working characteristics of the two target proportional valves (assuming that the two target proportional valves in the embodiment provided by the present application can be specifically but not limited to a low-power proportional valve and a high-power proportional valve) on the hydrogen subsystem test bench (see Figure 2 , Figure 2 A schematic diagram of the working characteristic curve of each target proportional valve in a control method for a dual proportional valve in a fuel cell system provided in an embodiment of the present application) is then used to determine the start-stop critical threshold current curve of each target proportional valve under different hydrogen medium pressures based on the above historical start-stop current data, such as Figure 3 See Figure 3 , Figure 3 A schematic diagram of a start-stop critical threshold current curve under different hydrogen medium pressures in a control method for a dual proportional valve in a fuel cell system provided in an embodiment of the present application, such as Figure 3 As shown, it is assumed that the hydrogen medium pressure of the fuel cell system to be detected is represented by H2_PMid, and according to Figure 3 The start-stop critical threshold current curve shown can determine: small proportional valve opening threshold current I_HGI1OpenThrd, small proportional valve opening working limit current I_HGI1OpenLimtThrd, small proportional valve closing working limit current I_HGI1CloseLimtThrd, large proportional valve opening threshold current I_HGI2OpenThrd and large proportional valve closing threshold current I_HGI2CloseThrd.

[0030] However, since the commonly used fuel cell system control only controls the duty cycle function of pulse width modulation (PWM), the output current cannot be directly controlled. Therefore, the embodiment provided by the present 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 embodiment provided by the present application accurately converts the start-stop threshold currents corresponding to the two target proportional valves into PWM duty cycle thresholds in the following manner: First, it is assumed that the embodiment provided in the present application is for any target proportional valve, and a temperature sensor is built into the electromagnetic coil of the target proportional valve to detect temperature data in real time, and then the electromagnetic coil resistance characteristic curve of the proportional valve corresponding to the target proportional valve at different temperatures is determined based on the temperature data currently detected by the sensor. For details, please refer to Figure 4 , Figure 4 A schematic diagram of a resistance characteristic curve of any target proportional valve in a fuel cell system at different temperatures provided in an embodiment of the present application is shown in FIG. Figure 4As shown, the resistance value can be specifically represented by: R_HGI_Y; wherein, the two target proportional valves in the embodiment provided in the present application can be specifically but not limited to a low-power proportional valve and a high-power proportional valve. Here, a small ejector is matched with a small-power proportional valve to meet the idle and low-power hydrogen circulation control requirements, while a large ejector is required to match a high-power proportional valve for medium and high power to intervene in order to meet the hydrogen circulation control requirements.

[0031] Then, based on the external battery voltage, the resistance and the limiting current of each proportional valve, the limiting duty ratio corresponding to each proportional valve is determined.

[0032] In the above, the embodiment provided in the present application needs to determine the real-time monitoring of the external battery voltage U_Bat provided by the external battery for the fuel cell system to be tested, and it can be seen that the controller of the fuel cell system to be tested adjusts the output voltage U_HGI at both ends of the proportional valve through PWM duty cycle adjustment, which is specifically: U_HGI=U_Bat*Duty_HGI / 100.

[0033] Here, the temperature data is detected by a temperature sensor built into the electromagnetic coil of the target proportional valve, specifically T_HGI, and the real-time resistance value corresponding to the target proportional valve is obtained by looking up the electromagnetic coil temperature-resistance curve table as R_HGI. According to Ohm's law, the following formula can be obtained: I_HGI=U_HGI / R_HGI; Duty_HGI=I_HGI* R_HGI *100 / U_Bat.

[0034] According to the above homework, the following parameters corresponding to the two target proportional valves can be determined: Small proportional valve opening threshold duty ratio Duty_HGI1OpenThrd; Small proportional valve opening limit threshold duty ratio Duty_HGI1OpenLimtThrd; Small proportional valve closing limit threshold duty ratio Duty_HGI1CloseLimtThrd; Large proportional valve opening threshold duty ratio Duty_HGI2OpenThrd; Large proportional valve closing threshold duty cycle Duty_HGI2CloseThrd.

[0035] S103: 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.

[0036] In this step, after determining that there is no need to switch the target proportional valve currently running in the current target operating state, that is, the target proportional valve is in the low-power operation stage and / or the high-power operation stage, the target output duty cycle corresponding to each target proportional valve is determined based on the preset duty cycle algorithms corresponding to the two PI controllers.

[0037] It can be understood that, since the two target proportional valves in the embodiment provided in the present application are specifically a high-power proportional valve and a low-power proportional valve, the target output duty cycle corresponding to the low-power proportional valve can be specifically but not limited to: ; The target output duty cycle corresponding to the high-power proportional valve can be specifically but not limited to: ; in, and They are all used to characterize different preset proportional integral coefficients, and the embodiments provided in this application can be, but are not limited to, applied to target proportional valves of different types of manufacturers by setting non-passed PI parameters.

[0038] S104. 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.

[0039] In this step, when it is determined that the high-power proportional valve is in the power reduction stage, or when it is determined that the low-power proportional valve is in the power increase stage, there is a process that requires switching the corresponding target proportional valve. After determining to switch any one of the target proportional valves, the embodiment provided in the present application needs to determine the first preset start-stop critical threshold duty cycle corresponding to the target proportional valve as the switching duty cycle of the target proportional valve under the current operating state, and determine the second preset start-stop critical threshold duty cycle corresponding to the other target proportional valve as the initial duty cycle of the other target proportional valve. In this way, the target proportional valve and the other target proportional valve can quickly skip the idle stroke during the switching process, thereby improving the hydrogen pressure building response speed, avoiding delays and lags, and thereby improving the accuracy of the switching.

[0040] It can be understood that idle travel refers to the situation where a tool or equipment moves while performing a processing task, but does not actually perform any substantial processing operation.

[0041] Among them, one of the embodiments provided by the present 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; the second embodiment provided by the present 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.

[0042] The control method of the dual proportional valve in the fuel cell system provided in 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, and for any target operating state, determines whether it is necessary to switch the target proportional valve running 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, and when it is not necessary to switch the target proportional valve, determines the target output duty cycle corresponding to the target proportional valve based on a preset duty cycle algorithm to complete the opening control of the target proportional valve, and when it is necessary to switch the target proportional valve, determines the target output duty cycle corresponding to the target proportional valve based on a preset duty cycle algorithm to complete the opening control of the target proportional valve, and when it is necessary to switch the target proportional valve, determines the target output duty cycle corresponding to the target proportional valve based on a 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 the switching, the initial switching duty cycle 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 in the present application embodies the current threshold for controlling the adjustment of the target proportional valve in the form of a duty cycle threshold. Without increasing the cost of the controller hardware in the fuel cell system to be tested, the operation of the target proportional valve is accurately controlled through the duty cycle. While improving the switching accuracy of the target proportional valve, the hysteresis of the target proportional valve during switching is reduced, thereby avoiding overshoot or undervoltage fluctuations in the hydrogen pressure on the anode side of the stack, reducing the probability of single low failure in the stack, and extending the service life of the fuel cell to be tested.

[0043] Furthermore, the embodiments provided in the present application enable the fuel cell system to be tested with dual ejectors and dual target proportional valves to maintain a relatively stable hydrogen pressure on the anode side (critical power section) at different operating temperatures and different hydrogen medium pressures, and to control the overshoot or underpressure of the gas pressure within an acceptable range for the fuel cell stack, thereby enabling the fuel cell stack to operate normally and increasing the service life of the fuel cell system to be tested.

[0044] In one embodiment, the target proportional valve includes a low-power proportional valve and a high-power proportional valve, and step S102 includes the following sub-steps: Sub-step 1021, 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.

[0045] In this step, when facing different target operating states, if you want to determine whether it is necessary to switch the target proportional valve that is running under the current target operating state, you first need to determine whether the first ratio between the first actual duty cycle of the small-power proportional valve in the target proportional valve and the first preset start-stop critical threshold duty cycle is 1, or 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 one of the two ratios is not 1, it means that the small-power proportional valve or the high-power proportional valve has reached the critical value for switching. In this case, the target proportional valve that is running under the target operating state will not be switched.

[0046] 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 tested under the current target operating state.

[0047] In this step, when facing different target operating states, when the first ratio or the second ratio is determined to be 1, the difference H2_PErr=H2_PDmd-H2_PStkIn between the target hydrogen pressure and the actual hydrogen pressure under the target operating state is determined.

[0048] Sub-step 1022: If yes, and the difference is greater than zero, it is determined that the low-power proportional valve currently running in the current target operating state needs to be switched to a high-power proportional valve.

[0049] 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 increases. At this time, the small-power proportional valve running in the target operating state reaches the small-power proportional valve opening limit threshold Duty_HGI1OpenLimtThrd. At this time, it is determined that the small-power proportional valve running in the current target operating state needs to be switched to a high-power proportional valve. Specifically, it can be but is not limited to: adjusting the small-power proportional valve to the locking mark position 1, and adjusting the high-power proportional valve to the closing mark position 0.

[0050] Sub-step 1023: If yes, and the difference is less than zero, it is determined that the high-power proportional valve currently running in the current target operating state needs to be switched to a low-power standard proportional valve.

[0051] 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 less than zero, it is determined that the target hydrogen pressure has dropped. At this time, the high-power proportional valve currently running in the target operating state reaches the high-power proportional valve closing threshold Duty_HGI2CloseThrd. At this time, it is determined that the high-power proportional valve currently running in the current target operating state needs to be switched to a low-power proportional valve. Specifically, it can be but is not limited to: adjusting the high-power proportional valve to the locking mark position 1, and adjusting the low-power proportional valve to the closing mark position 0.

[0052] Sub-step 1024: If not, it is determined that there is no need to switch the high-power proportional valve / low-power proportional valve currently running in the current target operating state.

[0053] In this step, if there is no difference H2_PErr, it means that the current target operating state is a high-power operating state under a high-power proportional valve or a low-power operating state under a low-power proportional valve or an initial startup state of the fuel cell system to be detected.

[0054] In one embodiment, 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 the 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 the first preset proportional-integral coefficient, the target hydrogen pressure under the current target operating state, and the actual hydrogen pressure.

[0055] In the above, it is assumed that the embodiment provided by the present application does not need to switch the low-power proportional valve. At this time, according to the first preset duty cycle algorithm, the formula for determining the first target output duty cycle of the low-power proportional valve is specifically: ; in, and They are all used to characterize different preset proportional integral coefficients, and the embodiments provided in this application can be, but are not limited to, applied to target proportional valves of different types of manufacturers by setting non-passed PI parameters.

[0056] It can be understood that when the fuel cell system to be tested is in the low-power operation stage and the small proportional valve can meet the hydrogen pressure requirement 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 lock mark position 0, and the high-power proportional valve is adjusted to the closing mark position 1, and the second target output duty cycle corresponding to the high-power proportional valve is determined to be 0.

[0057] In one embodiment, assuming 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 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 switching initial 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 it is necessary to switch the low-power proportional valve to a high-power proportional valve, the switching duty cycle of the small-power proportional valve is determined based on the small-proportional valve opening limit threshold duty cycle corresponding to the small-power proportional valve, and the initial switching duty cycle of the high-power proportional valve is determined based on the large-proportional valve opening threshold duty cycle corresponding to the switched high-power proportional valve, so as to complete the switching of the low-power proportional valve to the high-power proportional valve.

[0058] In one embodiment, 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 there is no need to switch the high-power proportional valve, the second target output duty cycle of the high-power proportional valve is determined based on the 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 the second preset proportional-integral coefficient, the target hydrogen pressure under the current target operating state, and the actual hydrogen pressure.

[0059] In the above, it is assumed that the embodiment provided by the present application does not need to switch the high-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 high-power proportional valve is specifically: ; in, and They are all used to characterize different preset proportional integral coefficients, and the embodiments provided in this application can be, but are not limited to, applied to target proportional valves of different types of manufacturers by setting non-passed PI parameters.

[0060] It can be understood that when the fuel cell system to be tested 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 high-power proportional valve is adjusted to the lock mark position 0, and the small-power proportional valve is adjusted to the closing mark position 1, and the first target output duty cycle corresponding to the small-power proportional valve is determined to be 0.

[0061] In one embodiment, assuming that the preset start-stop critical threshold duty ratio of the first embodiment provided by the present application includes the large proportional valve closing threshold duty ratio, and the second preset start-stop critical threshold duty ratio includes the small proportional valve closing limit threshold duty ratio, 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, 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 Duty_HGI2CloseThrd corresponding to the high-power proportional valve, and the initial switching duty cycle of the small-power proportional valve after switching is determined based on the small-proportional valve closing limit threshold duty cycle Duty_HGI1CloseLimtThrd corresponding to the switched small-power proportional valve, and the output is adjusted in real time to complete the switching of the high-power proportional valve to the low-power proportional valve again.

[0062] In one embodiment, for any target operating state, 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 includes: 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.

[0063] In the above, when the fuel cell system to be detected is in the initial startup state, the hydrogen subsystem enable flag is received as 1. At this time, the small power proportional valve PI control integral value is switched to the small proportional valve opening threshold duty cycle Duty_HGI1OpenThrd, so that the PI calculation value quickly skips the empty stroke, thereby improving the hydrogen pressure buildup response speed.

[0064] The control method of the dual proportional valve in the fuel cell system provided in 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, and for any target operating state, determines whether it is necessary to switch the target proportional valve running 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, and when it is not necessary to switch the target proportional valve, determines the target output duty cycle corresponding to the target proportional valve based on a preset duty cycle algorithm to complete the opening control of the target proportional valve, and when it is necessary to switch the target proportional valve, determines the target output duty cycle corresponding to the target proportional valve based on a preset duty cycle algorithm to complete the opening control of the target proportional valve, and when it is necessary to switch the target proportional valve, determines the target output duty cycle corresponding to the target proportional valve based on a 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 the switching, the initial switching duty cycle 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 in the present application embodies the current threshold for controlling the adjustment of the target proportional valve in the form of a duty cycle threshold. Without increasing the cost of the controller hardware in the fuel cell system to be tested, the operation of the target proportional valve is accurately controlled through the duty cycle. While improving the switching accuracy of the target proportional valve, the hysteresis of the target proportional valve during switching is reduced, thereby avoiding overshoot or undervoltage fluctuations in the hydrogen pressure on the anode side of the stack, reducing the probability of single low failure in the stack, and extending the service life of the fuel cell to be tested.

[0065] Furthermore, the embodiment provided in the present application uses a dual PI controller to control the low-power proportional valve and the high-power proportional valve respectively, so as to achieve seamless connection between the target proportional valves, and in the process of switching from the low-power proportional valve to the high-power proportional valve, the large proportional valve can be directly intervened with the large proportional valve opening threshold duty cycle, so as to avoid undervoltage caused by idle stroke calculation and pressure overshoot caused by sudden intervention of a larger duty cycle, and in the process of switching the power proportional valve to the low-power proportional valve, the small proportional valve can be intervened with the small proportional valve closing limit threshold duty cycle, so as to avoid pressure overshoot caused by idle stroke calculation and undervoltage caused by intervention of a smaller duty cycle, that is, the embodiment provided in the present application can enable the fuel cell system to be tested with dual ejectors and dual target proportional valves to maintain the hydrogen pressure on the anode side relatively stable (critical power section) at different operating temperatures and different hydrogen medium pressures, and can control the overshoot or undervoltage of the gas pressure within the acceptable range of the fuel cell stack, so that the fuel cell stack can work normally and the service life of the fuel cell system to be tested is increased.

[0066] See also Figure 5 , Figure 5 A structural block diagram of a control device for a dual proportional valve in a fuel cell system provided in an embodiment of the present application, such as Figure 5As shown, the control device 500 of the dual proportional valve in the fuel cell system includes: The first determination module 510 is used 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.

[0067] The second determination module 520 is used to determine, for any target operating state, whether it is necessary to switch the target proportional valve currently 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 tested in the current target operating state, wherein the fuel cell system to be tested includes two target proportional valves for switching with each other.

[0068] The third determination module 530 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.

[0069] The fourth determination module 540 is used to 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 if it is necessary to switch the target proportional valve, and to determine the initial switching 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.

[0070] In one embodiment, the target proportional valve includes a low-power proportional valve and a high-power proportional valve, and the first determination module 510 is specifically configured to: 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, it is determined 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.

[0071] If it exists and the difference is greater than zero, it is determined that the low-power proportional valve currently running in the current target operating state needs to be switched to a high-power proportional valve.

[0072] If it exists and the difference is less than zero, it is determined that the high-power proportional valve currently running under the current target operating state needs to be switched to a low-power standard proportional valve.

[0073] If not, it is determined that there is no need to switch the high-power proportional valve / low-power proportional valve that is running in the current target operating state.

[0074] In one embodiment, the second determining module 520 is specifically configured to: 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 the 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 the first preset proportional-integral coefficient, the target hydrogen pressure under the current target operating state, and the actual hydrogen pressure.

[0075] In one embodiment, the first preset start-stop critical threshold duty cycle includes a small proportional valve opening limit threshold duty cycle, and the second preset start-stop critical threshold duty cycle includes a large proportional valve opening 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 switching initial 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.

[0076] 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.

[0077] In one embodiment, the third determination module 530 is specifically configured to: If there is no need to switch the high-power proportional valve, the second target output duty cycle of the high-power proportional valve is determined based on the 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 the second preset proportional-integral coefficient, the target hydrogen pressure under the current target operating state, and the actual hydrogen pressure.

[0078] In one embodiment, the first preset start-stop critical threshold duty cycle includes a large proportional valve closing threshold duty cycle, and 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 switching initial 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 the high-power proportional valve needs to be switched 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.

[0079] 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 low power proportional valve again.

[0080] In one embodiment, the fourth determining module 540 is specifically configured to: 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.

[0081] The control device 500 of the dual proportional valve in the fuel cell system provided in 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, and for any target operating state, determines whether it is necessary to switch the target proportional valve running 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, and when it is not necessary to switch the target proportional valve, determines the target output duty cycle corresponding to the target proportional valve based on a preset duty cycle algorithm to complete the opening control of the target proportional valve, and when it is necessary to switch the target proportional valve, determines the target output duty cycle corresponding to the target proportional valve based on the first preset start-stop critical threshold corresponding to the target proportional valve. Duty cycle, determine the switching duty cycle of the target proportional valve, and based on the second preset start-stop critical threshold duty cycle corresponding to the other target proportional valve after switching, determine the initial switching duty cycle of the other target proportional valve, so as to complete the switching between the target proportional valve and the other target proportional valve. The embodiment provided in the present application embodies the current threshold for controlling the adjustment of the target proportional valve in the form of a duty cycle threshold. Without increasing the cost of the controller hardware in the fuel cell system to be tested, the duty cycle is used to accurately control the operation of the target proportional valve. While improving the switching accuracy of the target proportional valve, the lag of the target proportional valve during switching is reduced, thereby avoiding overshoot or undervoltage fluctuations in the hydrogen pressure on the anode side of the stack, reducing the probability of single low failure in the stack, and extending the service life of the fuel cell to be tested.

[0082] The embodiment provided in the present application uses a dual PI controller to control the low-power proportional valve and the high-power proportional valve respectively, so as to achieve seamless connection between the target proportional valves, and in the process of switching from the low-power proportional valve to the high-power proportional valve, the large proportional valve can be directly intervened with the large proportional valve opening threshold duty cycle, so as to avoid undervoltage caused by idle stroke calculation and pressure overshoot caused by sudden intervention of a larger duty cycle, and in the process of switching the power proportional valve to the low-power proportional valve, the small proportional valve can be intervened with the small proportional valve closing limit threshold duty cycle, so as to avoid pressure overshoot caused by idle stroke calculation and undervoltage caused by intervention of a smaller duty cycle, that is, the embodiment provided in the present application can enable the fuel cell system to be tested with dual ejection and dual target proportional valves to maintain the hydrogen pressure on the anode side relatively stable (critical power section) under different operating temperatures and different hydrogen medium pressures, and can control the overshoot or undervoltage of the gas pressure within the acceptable range of the fuel cell stack, so that the fuel cell stack can work normally and the service life of the fuel cell system to be tested is increased.

[0083] See also Figure 6 , Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the electronic device 600 includes a processor 610 , a memory 620 , and a bus 630 .

[0084] The memory 620 stores machine-readable instructions executable by the processor 610. When the electronic device 600 is running, the processor 610 communicates with the memory 620 via the bus 630. When the machine-readable instructions are executed by the processor 610, the above-mentioned Figures 1 to 4 The steps of the method for controlling the dual proportional valve in the fuel cell system in the method embodiment shown in the figure, and the specific implementation manner can be referred to the method embodiment, which will not be repeated here.

[0085] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the computer program can execute the above-mentioned Figures 1 to 4 The steps of the method for controlling the dual proportional valve in the fuel cell system in the method embodiment shown in the figure, and the specific implementation manner can be referred to the method embodiment, which will not be repeated here.

[0086] 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 aforementioned method embodiments and will not be repeated here.

[0087] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0088] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-readable program code.

[0089] The present application is described with reference to the flowcharts and / or block diagrams of the 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 flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0090] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0091] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0092] An embodiment of the present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device executes the process of a control method for a dual proportional valve in a fuel cell system.

[0093] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. 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 site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. 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 available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.

[0094] 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 aforementioned method embodiments and will not be repeated here.

[0095] In the 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 only schematic, for example, the division of 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 system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0096] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0097] 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.

[0098] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially 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, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0099] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0100] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0101] 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 equivalents, 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 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.

2. The control method of the dual proportional valve in the fuel cell system according to claim 1, characterized in that: 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 / low-power proportional valve currently running in the current target operating state.

3. 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, 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.

4. The control method of the dual proportional valve in the fuel cell system according to claim 2, 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.

5. The control method of the dual proportional valve in the fuel cell system according to claim 3, 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.

6. The control method of the dual proportional valve in the fuel cell system according to claim 4, 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.

7. 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.

8. 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; The fourth determination module is used to 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 if it is necessary to switch the target proportional valve, and to determine the initial switching 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.

9. 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 7.

10. 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 5 are executed.

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