A fuel cell parallel multi-proportional valve coordinated control method and device

Abstract

The present invention relates to the technical field of combustion batteries, and discloses a fuel cell parallel multi-proportional valve coordinated control method and device, the method receiving a hydrogen pressure control enable signal; obtaining a hydrogen pressure demand by analyzing the hydrogen pressure control enable signal; selecting a proportional valve control mode according to the hydrogen pressure demand, and determining the opening control mode and opening initial value of several proportional valves based on the proportional valve control mode; adjusting the opening of each proportional valve to the corresponding opening initial value, controlling each proportional valve to enter the proportional valve control mode based on the opening control mode of each proportional valve, and monitoring the opening of each proportional valve in real time; when there is a proportional valve whose opening meets the mode jump condition, controlling each proportional valve to jump the proportional valve control mode. The present invention can effectively improve the operating efficiency and utilization rate of each proportional valve under the premise of meeting the hydrogen pressure demand, and maintain the stability and safety of each proportional valve.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion batteries, and in particular to a method and device for coordinated control of parallel multi-proportional valves of fuel cells. Background Art

[0002] In automotive fuel cell systems, the purpose of proportional valve control is to maintain an oversupply of hydrogen in the stack reaction and a stable pressure difference between the hydrogen and air cavities. The performance and stability of the stack operation depend on the hydrogen pressure control strategy. Since the use of dual or multiple ejectors in parallel is usually better than using a single large-caliber ejector, current fuel cell systems generally use a multi-ejector arrangement, and the arrangement of multiple ejectors requires an increase in the number of corresponding front-end hydrogen proportional valves, which places higher requirements on the hydrogen proportional valve control strategy.

[0003] At present, the control method for the dual proportional valve is to use a PID controller to calculate the total opening required to maintain the target hydrogen pressure, and then distribute the opening, that is, when the total duty cycle is less than the maximum duty cycle of the first proportional valve, only the first proportional valve is controlled to output the duty cycle, and the second proportional valve is not used to output the duty cycle; and when the total duty cycle is greater than the maximum duty cycle of the first proportional valve, the first proportional valve is controlled to output the maximum duty cycle, and the difference between the total duty cycle output by the second proportional valve and the maximum duty cycle of the first proportional valve is used. In the existing dual proportional valve control method, when the second proportional valve is opened or closed, the hydrogen pressure fluctuates greatly, which is easy to trigger a high (low) hydrogen-air pressure difference fault, and the system is in an unstable state; and the second proportional valve is prone to repeated opening and closing, and under stable working conditions, frequent and large hydrogen pressure fluctuations will also occur; the dual proportional valve uses a master controller, and it is difficult to limit or compensate the duty cycle of a single proportional valve. Therefore, the current dual proportional valve control method has the problem of causing system instability and insufficient control accuracy. Summary of the invention

[0004] The present invention provides a fuel cell parallel multi-proportional valve coordinated control method and device, which effectively improves the operation efficiency and utilization rate of each proportional valve and maintains the stability and safety of each proportional valve.

[0005] In order to solve the above technical problems, the present invention provides a fuel cell parallel multi-proportional valve coordinated control method, comprising:

[0006] Receive a hydrogen pressure control enable signal;

[0007] Determining the hydrogen pressure demand by analyzing the hydrogen pressure control enable signal;

[0008] Selecting a proportional valve control mode according to the hydrogen pressure demand, and determining the opening control mode and the initial opening value of a plurality of proportional valves based on the proportional valve control mode;

[0009] The opening of each proportional valve is adjusted to a corresponding initial opening value, each proportional valve is controlled to enter the proportional valve control mode based on the opening control mode of each proportional valve, and the opening of each proportional valve is monitored in real time;

[0010] When the opening of a proportional valve meets the mode jump condition, each proportional valve is controlled to perform proportional valve control mode jump.

[0011] The present invention receives a hydrogen pressure control enable signal, and can obtain a hydrogen pressure demand by analyzing the hydrogen pressure control enable signal. It selects a suitable proportional valve control mode based on different hydrogen pressure demands, and can effectively improve the operation efficiency and utilization rate of each proportional valve under the premise of meeting the hydrogen pressure demand; determines the opening control mode and the initial opening value of each proportional valve based on the selected proportional valve control mode, adjusts each proportional valve to the corresponding initial opening value, and controls each proportional valve based on the opening control mode of each proportional valve under the selected proportional valve control mode, so that each proportional valve operates under the selected proportional valve control mode, and controls each proportional valve to operate under the same proportional valve control mode, which can ensure the safety of each proportional valve; collects the opening of each proportional valve in real time during the operation of each proportional valve, and can monitor the operation status of each proportional valve in real time. If the opening of the proportional valve meets the mode jump condition, timely control each proportional valve to jump the proportional valve control mode, so as to achieve efficient and accurate proportional valve control mode selection and maintain the stability of each proportional valve.

[0012] Further, the selecting of a proportional valve control mode according to the hydrogen pressure demand, and determining the opening control modes and opening initial values ​​of a plurality of proportional valves based on the proportional valve control mode, include:

[0013] When the hydrogen pressure demand is less than the first hydrogen pressure threshold, determining the proportional valve control mode to be the first proportional valve control mode;

[0014] Determining that the opening control mode of the first proportional valve in the first proportional valve control mode is closed-loop control, and the initial opening value of the first proportional valve is a preset first opening;

[0015] Determine that the opening control mode of the second proportional valve in the first proportional valve control mode is fixed opening control, and the initial opening value of the second proportional valve is a preset minimum opening; wherein the preset first opening is greater than the preset minimum opening.

[0016] Further, the selecting of a proportional valve control mode according to the hydrogen pressure demand, and determining the opening control modes and opening initial values ​​of a plurality of proportional valves based on the proportional valve control mode, include:

[0017] When the hydrogen pressure demand is greater than the first hydrogen pressure threshold and less than the second hydrogen pressure threshold, determining the proportional valve control mode to be the second proportional valve control mode;

[0018] Determining that the opening control mode of the first proportional valve in the second proportional valve control mode is fixed opening control, and the initial opening value of the first proportional valve is a preset optimal opening;

[0019] It is determined that the opening control mode of the second proportional valve in the second proportional valve control mode is closed-loop control, and the initial opening value of the second proportional valve is a preset maximum opening.

[0020] Further, the selecting of a proportional valve control mode according to the hydrogen pressure demand, and determining the opening control modes and opening initial values ​​of a plurality of proportional valves based on the proportional valve control mode, include:

[0021] When the hydrogen pressure demand is greater than the second hydrogen pressure threshold, determining the proportional valve control mode to be the third proportional valve control mode;

[0022] Determine that the opening control mode of the first proportional valve in the third proportional valve control mode is closed-loop control, and the initial opening value of the first proportional valve is a preset optimal opening;

[0023] It is determined that the opening control mode of the second proportional valve in the third proportional valve control mode is fixed opening control, and the initial opening value of the second proportional valve is a preset maximum opening.

[0024] Furthermore, when the opening of a proportional valve meets the mode jump condition, each proportional valve is controlled to perform proportional valve control mode jump, specifically:

[0025] When the opening of the proportional valve meets the mode jump condition, determining the mode jump mode based on the mode jump condition;

[0026] Determine the required jump opening control mode and the required jump opening initial value of each proportional valve based on the mode jump mode;

[0027] The opening of each proportional valve is adjusted to the corresponding initial value of the opening to be jumped, and the opening control mode of each proportional valve is adjusted to the corresponding opening control mode to be jumped, so as to complete the jump of the proportional valve control mode.

[0028] Further, when the opening of the proportional valve meets the mode jump condition, the mode jump mode is determined based on the mode jump condition, specifically:

[0029] When the opening of the first proportional valve in the first proportional valve control mode is greater than or equal to the first opening threshold, determining the mode jump mode is to jump from the first proportional valve control mode to the second proportional valve control mode; wherein the first opening threshold is greater than the preset optimal opening;

[0030] When the opening of the second proportional valve in the second proportional valve control mode is greater than or equal to the preset maximum opening, determining the mode jump mode is to jump from the second proportional valve control mode to the third proportional valve control mode;

[0031] When the opening of the first proportional valve in the third proportional valve control mode is less than or equal to the preset optimal opening, determining the mode jump mode is to jump from the third proportional valve control mode to the second proportional valve control mode;

[0032] When the opening of the second proportional valve in the second proportional valve control mode is less than or equal to the second opening threshold, the mode jump mode is determined to jump from the second proportional valve control mode to the first proportional valve control mode; wherein the second opening threshold is less than the preset optimal opening.

[0033] Furthermore, the control mode of the opening required to be jumped and the initial value of the opening required to be jumped of each proportional valve are determined based on the mode jump mode, specifically:

[0034] When jumping from the first proportional valve control mode to the second proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset first opening;

[0035] When jumping from the second proportional valve control mode to the third proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset maximum opening;

[0036] When jumping from the third proportional valve control mode to the second proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset maximum opening;

[0037] When jumping from the second proportional valve control mode to the first proportional valve control mode, the initial opening value required for jumping of the first proportional valve is determined to be the preset optimal opening, and the initial opening value required for jumping of the second proportional valve is determined to be the preset minimum opening.

[0038] Furthermore, before adjusting the opening of each proportional valve to the corresponding initial opening value to be jumped, it also includes:

[0039] The opening increment of each proportional valve is obtained by subtracting the current opening value from the initial opening value of each proportional valve to be jumped;

[0040] A proportional valve with a negative opening increment is determined as an opening-reducing proportional valve, and a proportional valve with a positive opening increment is determined as an opening-increasing proportional valve;

[0041] The opening compensation amount of the opening increasing proportional valve is determined according to the opening increasing amount of the opening decreasing proportional valve.

[0042] Furthermore, the opening of each proportional valve is adjusted to the corresponding initial value of the opening to be jumped, specifically:

[0043] The opening adjustment method of the control opening minus proportional valve is to control the opening minus proportional valve to jump from the current opening to the initial value of the opening to be jumped;

[0044] The opening adjustment method of the control opening increasing proportional valve is to control the opening increasing proportional valve to jump from the current opening to the initial value of the opening to be jumped, and increase the opening compensation amount in a differential manner.

[0045] Accordingly, the present invention provides a fuel cell parallel multi-proportional valve cooperative control device, comprising: a signal receiving module, a demand analysis module, a mode determination module, a proportional valve control module and a mode jump module;

[0046] The signal receiving module is used to receive a hydrogen pressure control enable signal;

[0047] The demand analysis module is used to obtain the hydrogen pressure demand by analyzing the hydrogen pressure control enable signal;

[0048] The mode determination module is used to select a proportional valve control mode according to the hydrogen pressure demand, and determine the opening control mode and the initial opening value of a plurality of proportional valves based on the proportional valve control mode;

[0049] The proportional valve control module is used to adjust the opening of each proportional valve to a corresponding initial opening value, control each proportional valve to enter the proportional valve control mode based on the opening control mode of each proportional valve, and monitor the opening of each proportional valve in real time;

[0050] The mode jump module is used to control each of the proportional valves to jump the proportional valve control mode when the opening of the proportional valve meets the mode jump condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic flow chart of an embodiment of a fuel cell parallel multi-proportional valve coordinated control method provided by the present invention;

[0052] Figure 2 A schematic flow chart of another embodiment of a fuel cell parallel multi-proportional valve coordinated control method provided by the present invention;

[0053] Figure 3 A schematic diagram of the change in the opening degree of the proportional valve provided by the present invention;

[0054] Figure 4 A schematic structural diagram of an embodiment of a fuel cell parallel multi-proportional valve cooperative control device provided by the present invention. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0057] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0058] Example 1

[0059] like Figure 1 FIG. 1 is a flow chart of an embodiment of a method for coordinated control of a fuel cell parallel multi-proportional valve provided by the present invention. The method includes steps 101 to 105, and each step is specifically as follows:

[0060] Step 101: Receive a hydrogen pressure control enable signal.

[0061] In practical applications, combustion battery systems often use hydrogen ejectors to achieve hydrogen reflux and improve hydrogen utilization. In fuel cell systems with higher power levels, in order to increase the hydrogen ejection ratio under medium and low load conditions and meet the hydrogen flow requirements under high load conditions, a more effective dual ejector or multiple ejectors will be used in parallel compared to a single large-caliber ejector. The arrangement of multiple ejectors requires corresponding multiple front-end hydrogen proportional valves. The hydrogen pressure demand of the current operating state can be obtained by receiving the hydrogen pressure control enable signal.

[0062] Step 102: deriving a hydrogen pressure demand by analyzing the hydrogen pressure control enable signal.

[0063] In the first embodiment of the present invention, based on the working characteristics of the ejector, when the ejector is at idle or low operating conditions, the hydrogen pressure demand is small, and only the corresponding small-caliber proportional valve can be opened; and when the ejector is at a medium or high operating point, a sufficient amount of hydrogen supply is required, so a larger-caliber proportional valve needs to be opened to meet most of the hydrogen flow requirements. For multiple proportional valves in the system, in order to meet the peak power load requirements, it is necessary to reasonably adjust the opening between the multiple proportional valves. Therefore, for different hydrogen pressure demands, a variety of proportional valve control modes can be constructed to achieve a variety of opening adjustment methods.

[0064] Step 103: selecting a proportional valve control mode according to the hydrogen pressure demand, and determining the opening control methods and initial opening values ​​of a plurality of proportional valves based on the proportional valve control mode.

[0065] Further, in the first embodiment of the present invention, a proportional valve control mode is selected according to the hydrogen pressure demand, and the opening control modes and opening initial values ​​of several proportional valves are determined based on the proportional valve control mode, including:

[0066] When the hydrogen pressure demand is less than the first hydrogen pressure threshold, determining the proportional valve control mode to be the first proportional valve control mode;

[0067] Determining that the opening control mode of the first proportional valve in the first proportional valve control mode is closed-loop control, and the initial opening value of the first proportional valve is a preset first opening;

[0068] Determine that the opening control mode of the second proportional valve in the first proportional valve control mode is fixed opening control, and the initial opening value of the second proportional valve is a preset minimum opening; wherein the preset first opening is greater than the preset minimum opening.

[0069] Optionally, for low hydrogen pressure demand, a first proportional valve control mode is constructed. The first proportional valve control mode can be regarded as an ejection enhancement mode, which is suitable for the low load stage. First, the optimal duty cycle of each proportional valve is obtained through testing. When the first proportional valve is set to the optimal opening corresponding to the optimal duty cycle, the second proportional valve can meet the rated power load before reaching the maximum duty cycle, and there is no need to adjust the first proportional valve to the maximum opening, thereby effectively improving the utilization rate of the first proportional valve. For low hydrogen pressure demand, only the corresponding small-caliber proportional valve can be opened to meet the current hydrogen pressure demand, so closed-loop control is adopted for the first proportional valve, and fixed opening control is adopted for the second proportional valve, and the second proportional valve is controlled to be fixed at the preset minimum opening. In order to achieve high utilization of the first proportional valve, the initial value of the opening using closed-loop control is determined as the preset optimal opening.

[0070] The present invention sets a first proportional valve control mode. Under the first proportional valve control mode, the opening control mode of the first proportional valve is closed-loop control, and the opening control mode of the second proportional valve is fixed opening control. When the hydrogen pressure demand is less than the first hydrogen pressure threshold, that is, when the hydrogen pressure demand is low, the first proportional valve is controlled to be the main hydrogen pressure providing proportional valve, and the initial opening value of the first proportional valve is controlled to be a preset optimal opening value, thereby improving the efficiency of the first proportional valve, and the initial opening value of the second proportional valve is set to a preset minimum opening value, thereby reducing the operating cost.

[0071] Further, in the first embodiment of the present invention, a proportional valve control mode is selected according to the hydrogen pressure demand, and the opening control modes and opening initial values ​​of several proportional valves are determined based on the proportional valve control mode, including:

[0072] When the hydrogen pressure demand is greater than the first hydrogen pressure threshold and less than the second hydrogen pressure threshold, determining the proportional valve control mode to be the second proportional valve control mode;

[0073] Determining that the opening control mode of the first proportional valve in the second proportional valve control mode is fixed opening control, and the initial opening value of the first proportional valve is a preset optimal opening;

[0074] It is determined that the opening control mode of the second proportional valve in the second proportional valve control mode is closed-loop control, and the initial opening value of the second proportional valve is a preset maximum opening.

[0075] Optionally, for medium and high hydrogen pressure requirements, a second proportional valve control mode is constructed. The second proportional valve control mode can be regarded as a flow supply mode, which is suitable for medium and high load to rated stage. For medium and high hydrogen pressure requirements, in order to maintain the stability of each proportional valve, the first proportional valve and the second proportional valve are used to provide hydrogen pressure at the same time. At this time, the first proportional valve is controlled by a fixed opening, and the opening of the first proportional valve is maintained at the preset optimal opening to achieve the best effect. Therefore, the initial opening value of the first proportional valve is determined as the preset optimal opening; and the second proportional valve is controlled by a closed loop, and the initial opening value of the second proportional valve is determined as the preset maximum opening.

[0076] The present invention sets a second proportional valve control mode. Under the second proportional valve control mode, the opening control mode of the second proportional valve is fixed opening control, and the opening control mode of the second proportional valve is closed-loop control. When the hydrogen pressure demand is greater than the first hydrogen pressure threshold and less than the second hydrogen pressure threshold, that is, when the hydrogen pressure demand is medium or high, the first proportional valve and the second proportional valve are controlled to meet the hydrogen pressure demand under the synergistic effect, and the initial opening value of the first proportional valve is controlled to be a preset optimal opening value to improve the efficiency of the first proportional valve, and the initial opening value of the second proportional valve is set to a preset maximum opening to achieve synergistic effect between the proportional valves.

[0077] Further, in the first embodiment of the present invention, a proportional valve control mode is selected according to the hydrogen pressure demand, and the opening control modes and opening initial values ​​of several proportional valves are determined based on the proportional valve control mode, including:

[0078] When the hydrogen pressure demand is greater than the second hydrogen pressure threshold, determining the proportional valve control mode to be the third proportional valve control mode;

[0079] Determine that the opening control mode of the first proportional valve in the third proportional valve control mode is closed-loop control, and the initial opening value of the first proportional valve is a preset optimal opening;

[0080] It is determined that the opening control mode of the second proportional valve in the third proportional valve control mode is fixed opening control, and the initial opening value of the second proportional valve is a preset maximum opening.

[0081] Optionally, for high hydrogen pressure demand, a third proportional valve control mode is constructed. The third proportional valve control mode can be regarded as an extreme load mode, which is suitable for the load stage from rated to peak power. For high hydrogen pressure demand, in order to maintain the stability of each proportional valve, the first proportional valve and the second proportional valve are used to provide hydrogen pressure at the same time. At this time, closed-loop control is adopted for the first proportional valve. In order to achieve high utilization of the first proportional valve, the initial opening value of the first proportional valve is set to the preset optimal opening; and fixed opening control is adopted for the second proportional valve, and the second proportional valve is controlled to be fixed at the preset maximum opening, so the initial opening value of the second proportional valve is determined to be the preset maximum opening.

[0082] The present invention sets a third proportional valve control mode. Under the third proportional valve control mode, the opening control mode of the third proportional valve is closed-loop control, and the opening control mode of the second proportional valve is fixed opening control. When the hydrogen pressure demand is greater than the second hydrogen pressure threshold, that is, when the hydrogen pressure demand is high, the first proportional valve and the second proportional valve are controlled to meet the hydrogen pressure demand under the synergistic effect, and the initial opening value of the first proportional valve is controlled to be a preset optimal opening value to improve the efficiency of the first proportional valve, and the initial opening value of the second proportional valve is set to a preset maximum opening to achieve the synergistic effect between the proportional valves.

[0083] In the first embodiment of the present invention, the closed-loop control can adopt fuzzy-proportional integral. By establishing a fuzzy rule base, the fuzzy input is mapped to the fuzzy output, and the actual control input is obtained by defuzzification. Fuzzy control is suitable for complex and nonlinear system control, can process imprecise and fuzzy information, and can maintain good control performance under the condition of system parameter changes and external interference.

[0084] The present invention sets three different proportional valve control modes. Since the closed-loop control of two valves at the same time requires the use of different control parameters, the calibration process is relatively cumbersome. In addition, there are many factors affecting the hydrogen pressure control during operation, which is prone to oscillation and large overshoot. Enabling two closed-loop control algorithms at the same time will increase the running time of a single cycle of the program and consume more controller memory. Therefore, the present invention only sets one proportional valve in a closed-loop control state in each proportional valve control mode, avoiding the defects based on the closed-loop control of two valves at the same time, and can effectively maintain stability during the operation of each proportional valve.

[0085] As an example of the first embodiment of the present invention, the preset minimum opening is set to 0%, the preset optimal opening is set to 50%, and the preset maximum opening is set to 90%. The control modes of each proportional valve in the three different proportional valve control modes are shown in the following table:

[0086]

[0087] Step 104: adjusting the opening of each proportional valve to a corresponding initial opening value, controlling each proportional valve to enter the proportional valve control mode based on the opening control method of each proportional valve, and monitoring the opening of each proportional valve in real time.

[0088] In the first embodiment of the present invention, after determining the proportional valve control mode according to the hydrogen pressure demand and obtaining the opening control mode and opening initial value of each proportional valve under the selected proportional valve control mode, the opening of each proportional valve is adjusted to the corresponding opening initial value, and the proportional valve enters the selected proportional valve control mode based on the opening control mode of each proportional valve. When operating under the determined selected proportional valve control mode, the opening of each proportional valve will change according to time. In order to improve the efficiency and utilization rate of each proportional valve, the mode jump condition is set. When the opening of the proportional valve reaches the preset mode jump condition during operation, the mode jump control is performed in time, thereby effectively improving the use effect of each proportional valve.

[0089] Step 105: When the opening of a proportional valve meets the mode jump condition, control each proportional valve to jump the proportional valve control mode.

[0090] Further, in the first embodiment of the present invention, when the opening of a proportional valve meets the mode jump condition, each proportional valve is controlled to perform proportional valve control mode jump, specifically:

[0091] When the opening of the proportional valve meets the mode jump condition, determining the mode jump mode based on the mode jump condition;

[0092] Determine the required jump opening control mode and the required jump opening initial value of each proportional valve based on the mode jump mode;

[0093] The opening of each proportional valve is adjusted to the corresponding initial value of the opening to be jumped, and the opening control mode of each proportional valve is adjusted to the corresponding opening control mode to be jumped, so as to complete the jump of the proportional valve control mode.

[0094] In the first embodiment of the present invention, among the three different proportional valve control modes, there is a proportional valve whose opening control mode is closed-loop control. Therefore, when the opening of a proportional valve meets the mode jump condition and the mode jump is triggered, it is necessary to reasonably determine the initial opening value of each proportional valve enabled with closed-loop control, so that when the mode jump occurs, the hydrogen pressure will not fluctuate greatly or even get out of control, thereby achieving a smooth transition between modes.

[0095] Further, in the first embodiment of the present invention, when the opening of the proportional valve meets the mode jump condition, the mode jump mode is determined based on the mode jump condition, specifically:

[0096] When the opening of the first proportional valve in the first proportional valve control mode is greater than or equal to the first opening threshold, determining the mode jump mode is to jump from the first proportional valve control mode to the second proportional valve control mode; wherein the first opening threshold is greater than the preset optimal opening;

[0097] When the opening of the second proportional valve in the second proportional valve control mode is greater than or equal to the preset maximum opening, determining the mode jump mode is to jump from the second proportional valve control mode to the third proportional valve control mode;

[0098] When the opening of the first proportional valve in the third proportional valve control mode is less than or equal to the preset optimal opening, determining the mode jump mode is to jump from the third proportional valve control mode to the second proportional valve control mode;

[0099] When the opening of the second proportional valve in the second proportional valve control mode is less than or equal to the second opening threshold, the mode jump mode is determined to jump from the second proportional valve control mode to the first proportional valve control mode; wherein the second opening threshold is less than the preset optimal opening.

[0100] In the first embodiment of the present invention, for the three different proportional valve control modes set, there may be a situation where the first proportional valve control mode jumps to the second proportional valve control mode, the second proportional valve control mode jumps to the third proportional valve control mode, the third proportional valve control mode jumps to the second proportional valve control mode, and the second proportional valve control mode jumps to the first proportional valve control mode. Therefore, based on different mode jump situations, different mode jump conditions are set. The setting of mode jump conditions is conducive to coordinating the synergy between the control valves.

[0101] As an example of the first embodiment of the present invention, see Figure 2, is a flow chart of another embodiment of the fuel cell parallel multi-proportional valve coordinated control method provided by the present invention. Set the preset optimal opening to 50%, the first opening threshold to 58%, the preset maximum opening to 90%, and the second opening threshold to 25%. Hydrogen pressure control enables each proportional valve to enter the first proportional valve control mode; in the first proportional valve control mode, if the opening of the first proportional valve PCV1 is greater than or equal to 58%, that is, the first opening threshold, each proportional valve is controlled to enter the second proportional valve control mode; in the second proportional valve control mode, if the opening of the second proportional valve PCV2 is greater than or equal to 90%, that is, the preset maximum opening, each proportional valve is controlled to enter the third proportional valve control mode; in the third proportional valve control mode, if the opening of the first proportional valve PCV1 is less than or equal to 50%, that is, the preset optimal opening, each proportional valve is controlled to enter the second proportional valve control mode; in the second proportional valve control mode, if the opening of the second proportional valve PCV2 is less than or equal to 25%, that is, the second opening threshold, each proportional valve is controlled to enter the first proportional valve control mode. The mode jump condition for jumping from the second proportional valve control mode to the first proportional valve control mode may also include that the hydrogen pressure error is less than -3 kPa and the error change rate is negative.

[0102] Further, in the first embodiment of the present invention, the required jump opening control mode and the required jump opening initial value of each proportional valve are determined based on the mode jump mode, specifically:

[0103] When jumping from the first proportional valve control mode to the second proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset first opening;

[0104] When jumping from the second proportional valve control mode to the third proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset maximum opening;

[0105] When jumping from the third proportional valve control mode to the second proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset maximum opening;

[0106] When jumping from the second proportional valve control mode to the first proportional valve control mode, the initial opening value required for jumping of the first proportional valve is determined to be the preset optimal opening, and the initial opening value required for jumping of the second proportional valve is determined to be the preset minimum opening.

[0107] In the first embodiment of the present invention, for different mode jump situations, it is necessary to reasonably set the initial opening value of each proportional valve after the mode jump, so that the hydrogen pressure will not fluctuate greatly or even get out of control during the mode jump, and a smooth transition between modes can be achieved.

[0108] Optionally, in the case of jumping from the first proportional valve control mode to the second proportional valve control mode, since the first proportional valve is a fixed opening control in the second proportional valve control mode, the initial value of the opening required to jump of the second proportional valve is set to a preset optimal opening. Since the second proportional valve is in a non-adjustable state in the first proportional valve control mode, its opening value is fixed to a preset minimum opening, but in order to ensure that the hydrogen pressure demand is met, the initial value of the opening required to jump of the second proportional valve is set to a preset first opening greater than the preset minimum opening.

[0109] Optionally, in the case of jumping from the second proportional valve control mode to the third proportional valve control mode, since the first proportional valve is in a non-adjusting state in the second proportional valve control mode, its duty cycle value is fixed to a preset optimal opening, so when the first proportional valve exits the non-adjusting state of the second proportional valve control mode and enters the adjusting state of the third proportional valve control mode, in order to maintain the smoothness of the mode conversion, it is necessary to maintain the consistency of the opening of the first proportional valve during the mode jump, so the initial value of the opening required to jump of the first proportional valve is set to the preset optimal opening. Since the second proportional valve is a fixed opening control in the third proportional valve control mode, the initial value of the opening required to jump of the second proportional valve is set to the preset maximum opening.

[0110] Optionally, in the case of jumping from the third proportional valve control mode to the second proportional valve control mode, since the first proportional valve is a fixed opening control in the second proportional valve control mode, the initial value of the opening required to jump of the first proportional valve is set to a preset optimal opening. Since the second proportional valve is in a non-adjusting state in the third proportional valve control mode, its duty cycle value is fixed to the preset optimal opening, so when the second proportional valve exits the non-adjusting state of the third proportional valve control mode and enters the adjusting state of the second proportional valve control mode, in order to maintain the smoothness of the mode conversion, it is necessary to maintain the consistency of the opening of the second proportional valve when the mode jumps, so the initial value of the opening required to jump of the second proportional valve is set to the preset maximum opening.

[0111] Optionally, in the case of jumping from the second proportional valve control mode to the first proportional valve control mode, since the first proportional valve is in a non-adjusting state in the second proportional valve control mode, its duty cycle value is fixed to a preset optimal opening, so when the first proportional valve exits the non-adjusting state of the second proportional valve control mode and enters the adjusting state of the first proportional valve control mode, in order to maintain the smoothness of the mode conversion, the consistency of the first proportional valve in the mode jump needs to be maintained, so the initial value of the opening required to jump of the first proportional valve is set to the preset optimal opening. Since the second proportional valve is a fixed opening control in the first proportional valve control mode, the initial value of the opening required to jump of the second proportional valve is set to the preset minimum opening.

[0112] Furthermore, in the first embodiment of the present invention, before adjusting the opening of each proportional valve to the corresponding initial opening value to be jumped, the method further includes:

[0113] The opening increment of each proportional valve is obtained by subtracting the current opening value from the initial opening value of each proportional valve to be jumped;

[0114] A proportional valve with a negative opening increment is determined as an opening-reducing proportional valve, and a proportional valve with a positive opening increment is determined as an opening-increasing proportional valve;

[0115] The opening compensation amount of the opening increasing proportional valve is determined according to the opening increasing amount of the opening decreasing proportional valve.

[0116] In the first embodiment of the present invention, since the valve caliber, driving current and other characteristics of the first proportional valve and the second proportional valve are different, and the proportional valve has different free strokes with the difference in ambient temperature, when the fuel cell load reaches the valve switching point, the hydrogen flow rate is difficult to follow the growth trend of the current in real time, and there is an obvious lag, resulting in a large hydrogen pressure drop. When the proportional valve changes the opening state, the instantaneous increase in current causes a large overshoot of the hydrogen pressure, and the subsequent stabilization time is long. Therefore, when implementing the mode jump, the opening compensation amount needs to be set to improve the hydrogen pressure fluctuation caused by the mode jump.

[0117] The following example shows how to use the opening compensation control mode jump from the first proportional valve control mode to the second proportional valve control mode:

[0118] When the opening of the first proportional valve in the first proportional valve control mode is greater than or equal to the first opening threshold (which can be set to 58%), the first proportional valve control mode is triggered to jump to the second proportional valve control mode, and the initial value of the opening required to jump of the first proportional valve is determined to be the preset optimal opening (which can be set to 50%), and the initial value of the opening required to jump of the second proportional valve is determined to be the preset first opening (which can be set to 15%). The process of mode jump is: the first proportional valve automatically decreases from an opening of 58% to an opening of 50%, and the second proportional valve enables closed-loop control. In order to avoid a large hydrogen pressure drop, when entering the second proportional valve control mode, the opening compensation amount (which can be set to 10%) will be compensated to the second proportional valve. The second proportional valve starts to accumulate the opening by adding 10% to the opening of 15%, which is used to make up for the duty cycle subtracted by the first proportional valve and the part of the hydrogen flow rate lagging behind the current load speed. See Figure 3 , is a schematic diagram of the change in the opening degree of the proportional valve provided by the present invention, Figure 3 The duty cycle of proportional valve 1 is equivalent to the opening of the first proportional valve, the duty cycle of proportional valve 2 is equivalent to the opening of the second proportional valve, mode 1 is equivalent to the first proportional valve control mode, and mode 2 is equivalent to the second proportional valve control mode. Figure 3The change in the proportional valve duty cycle indicates the change in the opening degree of the first proportional valve and the second proportional valve when the first proportional valve control mode is switched to the second proportional valve control mode.

[0119] Furthermore, if each proportional valve enters the second proportional valve control mode and operates stably, it is necessary to eliminate the 10% opening compensation amount of the second proportional valve so that the actual duty cycle is in a dynamic equilibrium state.

[0120] The present invention can effectively reduce the hydrogen pressure drop caused by mode jumping by setting the opening compensation amount, and avoid the phenomenon that the first proportional valve control mode and the second proportional valve control mode repeatedly jump to each other due to the effect of the tail exhaust at a certain steady-state operating point, thereby causing drastic fluctuations in hydrogen pressure.

[0121] Furthermore, in the first embodiment of the present invention, the opening of each proportional valve is adjusted to the corresponding initial value of the opening to be jumped, specifically:

[0122] The opening adjustment method of the control opening minus proportional valve is to control the opening minus proportional valve to jump from the current opening to the initial value of the opening to be jumped;

[0123] The opening adjustment method of the control opening increasing proportional valve is to control the opening increasing proportional valve to jump from the current opening to the initial value of the opening to be jumped, and increase the opening compensation amount in a differential manner.

[0124] In the first embodiment of the present invention, if the opening compensation amount is added to the opening increasing proportional valve in the form of a constant, the opening compensation amount may be repeatedly superimposed on another valve, resulting in a step change in the opening of the proportional valve. Therefore, increasing the opening compensation amount by differential or rate of change can avoid hydrogen pressure fluctuations caused by repeated compensation of the feedforward amount.

[0125] Furthermore, in the process of eliminating the opening compensation, if it is directly set to zero, the hydrogen pressure will drop suddenly, and the duty cycle of the opening proportional valve will return to the free stroke, resulting in hydrogen pressure out of control. Therefore, the opening compensation is eliminated by differential or rate of change, so that in the process of eliminating the opening compensation, the closed-loop control algorithm compensates the eliminated opening compensation through cumulative action, so that the actual duty cycle is in a dynamic equilibrium state.

[0126] Furthermore, from the time when the first proportional valve control mode is triggered to jump to the second proportional valve control mode, until the opening compensation amount of the second proportional valve is eliminated to zero, the tail exhaust valve is prohibited from operating during the entire process to avoid causing additional hydrogen flow loss and thus causing a significant decrease in hydrogen pressure.

[0127] Furthermore, when the fuel cell system is in the tail exhaust stage and jumps from the first proportional valve control mode to the second proportional valve control mode, the opening compensation is added to the current closed-loop control to minimize the hydrogen pressure drop. At the moment of tail exhaust valve opening, the opening compensation can vary in the range of [0.5ˉ3] according to different operating points, and when the second proportional valve changes from closed to open, the opening compensation can reach more than 10%. If the opening compensation is directly added to the currently enabled proportional valve in the form of a constant, if a mode jump occurs at this time, the opening compensation will be repeatedly superimposed on another valve, resulting in a step change in the proportional valve opening. Therefore, whether it is tail exhaust feedforward or valve cut feedforward, the differential or change rate should be used in the process of eliminating the opening compensation to prevent the hydrogen pressure drop caused by the reverse step change of the valve duty cycle, and the smaller the absolute value of the change rate, the smaller the hydrogen pressure drop.

[0128] In summary, the first embodiment of the present invention provides a method for coordinated control of multiple proportional valves in parallel for a fuel cell, which receives a hydrogen pressure control enable signal, obtains a hydrogen pressure demand by analyzing the hydrogen pressure control enable signal, selects a suitable proportional valve control mode based on different hydrogen pressure demands, and effectively improves the operating efficiency and utilization rate of each proportional valve under the premise of meeting the hydrogen pressure demand; determines the opening control mode and the initial opening value of each proportional valve based on the selected proportional valve control mode, adjusts each proportional valve to the corresponding initial opening value, and controls each proportional valve based on the opening control mode of each proportional valve under the selected proportional valve control mode, so that each proportional valve operates under the selected proportional valve control mode, and controls each proportional valve to operate under the same proportional valve control mode, which can ensure the safety of each proportional valve; collects the opening of each proportional valve in real time during the operation of each proportional valve, and can monitor the operating status of each proportional valve in real time. If the opening of the proportional valve meets the mode jump condition, timely control each proportional valve to jump the proportional valve control mode, so as to achieve efficient and accurate proportional valve control mode selection and maintain the stability of each proportional valve.

[0129] Example 2

[0130] See also Figure 4 , is a structural schematic diagram of an embodiment of a fuel cell parallel multi-proportional valve cooperative control device provided by the present invention, the device includes a signal receiving module 201, a demand analysis module 202, a mode determination module 203, a proportional valve control module 204 and a mode jump module 205;

[0131] The signal receiving module 201 is used to receive a hydrogen pressure control enable signal;

[0132] The demand analysis module 202 is used to obtain the hydrogen pressure demand by analyzing the hydrogen pressure control enable signal;

[0133] The mode determination module 203 is used to select a proportional valve control mode according to the hydrogen pressure demand, and determine the opening control mode and the initial opening value of a plurality of proportional valves based on the proportional valve control mode;

[0134] The proportional valve control module 204 is used to adjust the opening of each proportional valve to a corresponding initial opening value, control each proportional valve to enter the proportional valve control mode based on the opening control mode of each proportional valve, and monitor the opening of each proportional valve in real time;

[0135] The mode jump module 205 is used to control each proportional valve to jump the proportional valve control mode when the opening of the proportional valve meets the mode jump condition.

[0136] Further, in the second embodiment of the present invention, a proportional valve control mode is selected according to the hydrogen pressure demand, and the opening control modes and opening initial values ​​of several proportional valves are determined based on the proportional valve control mode, including:

[0137] When the hydrogen pressure demand is less than the first hydrogen pressure threshold, determining the proportional valve control mode to be the first proportional valve control mode;

[0138] Determining that the opening control mode of the first proportional valve in the first proportional valve control mode is closed-loop control, and the initial opening value of the first proportional valve is a preset first opening;

[0139] Determine that the opening control mode of the second proportional valve in the first proportional valve control mode is fixed opening control, and the initial opening value of the second proportional valve is a preset minimum opening; wherein the preset first opening is greater than the preset minimum opening.

[0140] Further, in the second embodiment of the present invention, a proportional valve control mode is selected according to the hydrogen pressure demand, and the opening control modes and opening initial values ​​of several proportional valves are determined based on the proportional valve control mode, including:

[0141] When the hydrogen pressure demand is greater than the first hydrogen pressure threshold and less than the second hydrogen pressure threshold, determining the proportional valve control mode to be the second proportional valve control mode;

[0142] Determining that the opening control mode of the first proportional valve in the second proportional valve control mode is fixed opening control, and the initial opening value of the first proportional valve is a preset optimal opening;

[0143] It is determined that the opening control mode of the second proportional valve in the second proportional valve control mode is closed-loop control, and the initial opening value of the second proportional valve is a preset maximum opening.

[0144] Further, in the second embodiment of the present invention, a proportional valve control mode is selected according to the hydrogen pressure demand, and the opening control modes and opening initial values ​​of several proportional valves are determined based on the proportional valve control mode, including:

[0145] When the hydrogen pressure demand is greater than the second hydrogen pressure threshold, determining the proportional valve control mode to be the third proportional valve control mode;

[0146] Determine that the opening control mode of the first proportional valve in the third proportional valve control mode is closed-loop control, and the initial opening value of the first proportional valve is a preset optimal opening;

[0147] It is determined that the opening control mode of the second proportional valve in the third proportional valve control mode is fixed opening control, and the initial opening value of the second proportional valve is a preset maximum opening.

[0148] Further, in the second embodiment of the present invention, when the opening of a proportional valve meets the mode jump condition, each proportional valve is controlled to perform proportional valve control mode jump, specifically:

[0149] When the opening of the proportional valve meets the mode jump condition, determining the mode jump mode based on the mode jump condition;

[0150] Determine the required jump opening control mode and the required jump opening initial value of each proportional valve based on the mode jump mode;

[0151] The opening of each proportional valve is adjusted to the corresponding initial value of the opening to be jumped, and the opening control mode of each proportional valve is adjusted to the corresponding opening control mode to be jumped, so as to complete the jump of the proportional valve control mode.

[0152] Further, in the second embodiment of the present invention, when the opening of the proportional valve meets the mode jump condition, the mode jump mode is determined based on the mode jump condition, specifically:

[0153] When the opening of the first proportional valve in the first proportional valve control mode is greater than or equal to the first opening threshold, determining the mode jump mode is to jump from the first proportional valve control mode to the second proportional valve control mode; wherein the first opening threshold is greater than the preset optimal opening;

[0154] When the opening of the second proportional valve in the second proportional valve control mode is greater than or equal to the preset maximum opening, determining the mode jump mode is to jump from the second proportional valve control mode to the third proportional valve control mode;

[0155] When the opening of the first proportional valve in the third proportional valve control mode is less than or equal to the preset optimal opening, determining the mode jump mode is to jump from the third proportional valve control mode to the second proportional valve control mode;

[0156] When the opening of the second proportional valve in the second proportional valve control mode is less than or equal to the second opening threshold, the mode jump mode is determined to jump from the second proportional valve control mode to the first proportional valve control mode; wherein the second opening threshold is less than the preset optimal opening.

[0157] Further, in the second embodiment of the present invention, the required jump opening control mode and the required jump opening initial value of each proportional valve are determined based on the mode jump mode, specifically:

[0158] When jumping from the first proportional valve control mode to the second proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset first opening;

[0159] When jumping from the second proportional valve control mode to the third proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset maximum opening;

[0160] When jumping from the third proportional valve control mode to the second proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset maximum opening;

[0161] When jumping from the second proportional valve control mode to the first proportional valve control mode, the initial opening value required for jumping of the first proportional valve is determined to be the preset optimal opening, and the initial opening value required for jumping of the second proportional valve is determined to be the preset minimum opening.

[0162] Furthermore, in the second embodiment of the present invention, before adjusting the opening of each proportional valve to the corresponding initial value of the opening to be jumped, it also includes:

[0163] The opening increment of each proportional valve is obtained by subtracting the current opening value from the initial opening value of each proportional valve to be jumped;

[0164] A proportional valve with a negative opening increment is determined as an opening-reducing proportional valve, and a proportional valve with a positive opening increment is determined as an opening-increasing proportional valve;

[0165] The opening compensation amount of the opening increasing proportional valve is determined according to the opening increasing amount of the opening decreasing proportional valve.

[0166] Furthermore, in the second embodiment of the present invention, the opening of each proportional valve is adjusted to the corresponding initial value of the opening to be jumped, specifically:

[0167] The opening adjustment method of the control opening minus proportional valve is to control the opening minus proportional valve to jump from the current opening to the initial value of the opening to be jumped;

[0168] The opening adjustment method of the control opening increasing proportional valve is to control the opening increasing proportional valve to jump from the current opening to the initial value of the opening to be jumped, and increase the opening compensation amount in a differential manner.

[0169] In summary, the second embodiment of the present invention provides a fuel cell parallel multi-proportional valve cooperative control device, which is based on the organic combination between modules, receives a hydrogen pressure control enable signal, and can obtain the hydrogen pressure demand by analyzing the hydrogen pressure control enable signal. The appropriate proportional valve control mode is selected based on different hydrogen pressure demands, which can effectively improve the operation efficiency and utilization rate of each proportional valve under the premise of meeting the hydrogen pressure demand; the opening control mode and the initial opening value of each proportional valve are determined based on the selected proportional valve control mode, each proportional valve is adjusted to the corresponding initial opening value, and each proportional valve is controlled based on the opening control mode of each proportional valve under the selected proportional valve control mode, so that each proportional valve operates under the selected proportional valve control mode, and each proportional valve is controlled to operate under the same proportional valve control mode, which can ensure the safety of each proportional valve; the opening of each proportional valve is collected in real time during the operation of each proportional valve, and the operation status of each proportional valve can be monitored in real time. If the opening of the proportional valve meets the mode jump condition, each proportional valve is promptly controlled to jump the proportional valve control mode, so as to achieve efficient and accurate proportional valve control mode selection and maintain the stability of each proportional valve.

[0170] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fuel cell parallel multi-proportional valve coordinated control method, characterized in that: include: Receive a hydrogen pressure control enable signal; Determining the hydrogen pressure demand by analyzing the hydrogen pressure control enable signal; Selecting a proportional valve control mode according to the hydrogen pressure demand, and determining the opening control mode and the initial opening value of a plurality of proportional valves based on the proportional valve control mode; The opening of each proportional valve is adjusted to a corresponding initial opening value, each proportional valve is controlled to enter the proportional valve control mode based on the opening control mode of each proportional valve, and the opening of each proportional valve is monitored in real time; When the opening of a proportional valve meets the mode jump condition, each proportional valve is controlled to perform proportional valve control mode jump.

2. The fuel cell parallel multi-proportional valve coordinated control method according to claim 1, characterized in that: The selecting a proportional valve control mode according to the hydrogen pressure demand, and determining the opening control modes and opening initial values ​​of a plurality of proportional valves based on the proportional valve control mode, includes: When the hydrogen pressure demand is less than the first hydrogen pressure threshold, determining the proportional valve control mode to be the first proportional valve control mode; Determining that the opening control mode of the first proportional valve in the first proportional valve control mode is closed-loop control, and the initial opening value of the first proportional valve is a preset first opening; Determine that the opening control mode of the second proportional valve in the first proportional valve control mode is fixed opening control, and the initial opening value of the second proportional valve is a preset minimum opening; wherein the preset first opening is greater than the preset minimum opening.

3. The fuel cell parallel multi-proportional valve coordinated control method according to claim 2, characterized in that: The selecting a proportional valve control mode according to the hydrogen pressure demand, and determining the opening control modes and opening initial values ​​of a plurality of proportional valves based on the proportional valve control mode, includes: When the hydrogen pressure demand is greater than the first hydrogen pressure threshold and less than the second hydrogen pressure threshold, determining the proportional valve control mode to be the second proportional valve control mode; Determining that the opening control mode of the first proportional valve in the second proportional valve control mode is fixed opening control, and the initial opening value of the first proportional valve is a preset optimal opening; It is determined that the opening control mode of the second proportional valve in the second proportional valve control mode is closed-loop control, and the initial opening value of the second proportional valve is a preset maximum opening.

4. The fuel cell parallel multi-proportional valve coordinated control method according to claim 3, characterized in that: The selecting a proportional valve control mode according to the hydrogen pressure demand, and determining the opening control modes and opening initial values ​​of a plurality of proportional valves based on the proportional valve control mode, includes: When the hydrogen pressure demand is greater than the second hydrogen pressure threshold, determining the proportional valve control mode to be the third proportional valve control mode; Determine that the opening control mode of the first proportional valve in the third proportional valve control mode is closed-loop control, and the initial opening value of the first proportional valve is a preset optimal opening; It is determined that the opening control mode of the second proportional valve in the third proportional valve control mode is fixed opening control, and the initial opening value of the second proportional valve is a preset maximum opening.

5. The fuel cell parallel multi-proportional valve coordinated control method according to claim 4, characterized in that: When the opening of a proportional valve meets the mode jump condition, each proportional valve is controlled to perform proportional valve control mode jump, specifically: When the opening of the proportional valve meets the mode jump condition, determining the mode jump mode based on the mode jump condition; Determine the required jump opening control mode and the required jump opening initial value of each proportional valve based on the mode jump mode; The opening of each proportional valve is adjusted to the corresponding initial value of the opening to be jumped, and the opening control mode of each proportional valve is adjusted to the corresponding opening control mode to be jumped, so as to complete the jump of the proportional valve control mode.

6. The fuel cell parallel multi-proportional valve coordinated control method according to claim 5, characterized in that: When the opening of the proportional valve meets the mode jump condition, the mode jump mode is determined based on the mode jump condition, specifically: When the opening of the first proportional valve in the first proportional valve control mode is greater than or equal to the first opening threshold, determining the mode jump mode is to jump from the first proportional valve control mode to the second proportional valve control mode; wherein the first opening threshold is greater than the preset optimal opening; When the opening of the second proportional valve in the second proportional valve control mode is greater than or equal to the preset maximum opening, determining the mode jump mode is to jump from the second proportional valve control mode to the third proportional valve control mode; When the opening of the first proportional valve in the third proportional valve control mode is less than or equal to the preset optimal opening, determining the mode jump mode is to jump from the third proportional valve control mode to the second proportional valve control mode; When the opening of the second proportional valve in the second proportional valve control mode is less than or equal to the second opening threshold, the mode jump mode is determined to jump from the second proportional valve control mode to the first proportional valve control mode; wherein the second opening threshold is less than the preset optimal opening.

7. The fuel cell parallel multi-proportional valve coordinated control method according to claim 5, characterized in that: The method of determining the required jump opening control mode and the required jump opening initial value of each proportional valve based on the mode jump mode is specifically as follows: When jumping from the first proportional valve control mode to the second proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset first opening; When jumping from the second proportional valve control mode to the third proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset maximum opening; When jumping from the third proportional valve control mode to the second proportional valve control mode, determining the initial value of the opening required to jump of the first proportional valve to be the preset optimal opening, and determining the initial value of the opening required to jump of the second proportional valve to be the preset maximum opening; When jumping from the second proportional valve control mode to the first proportional valve control mode, the initial opening value required for jumping of the first proportional valve is determined to be the preset optimal opening, and the initial opening value required for jumping of the second proportional valve is determined to be the preset minimum opening.

8. The fuel cell parallel multi-proportional valve coordinated control method according to claim 5, characterized in that: Before adjusting the opening of each proportional valve to the corresponding initial value of the opening to be jumped, the method further includes: The opening increment of each proportional valve is obtained by subtracting the current opening value from the initial opening value of each proportional valve to be jumped; A proportional valve with a negative opening increment is determined as an opening-reducing proportional valve, and a proportional valve with a positive opening increment is determined as an opening-increasing proportional valve; The opening compensation amount of the opening increasing proportional valve is determined according to the opening increasing amount of the opening decreasing proportional valve.

9. The fuel cell parallel multi-proportional valve coordinated control method according to claim 8, characterized in that: The opening of each proportional valve is adjusted to the corresponding initial value of the opening to be jumped, specifically: The opening adjustment method of the control opening minus proportional valve is to control the opening minus proportional valve to jump from the current opening to the initial value of the opening to be jumped; The opening adjustment method of the control opening increasing proportional valve is to control the opening increasing proportional valve to jump from the current opening to the initial value of the opening to be jumped, and increase the opening compensation amount in a differential manner.

10. A fuel cell parallel multi-proportional valve coordinated control device, characterized in that: include: Signal receiving module, demand analysis module, mode determination module, proportional valve control module and mode jump module; The signal receiving module is used to receive a hydrogen pressure control enable signal; The demand analysis module is used to obtain the hydrogen pressure demand by analyzing the hydrogen pressure control enable signal; The mode determination module is used to select a proportional valve control mode according to the hydrogen pressure demand, and determine the opening control mode and the initial opening value of a plurality of proportional valves based on the proportional valve control mode; The proportional valve control module is used to adjust the opening of each proportional valve to a corresponding initial opening value, control each proportional valve to enter the proportional valve control mode based on the opening control mode of each proportional valve, and monitor the opening of each proportional valve in real time; The mode jump module is used to control each of the proportional valves to jump the proportional valve control mode when the opening of the proportional valve meets the mode jump condition.

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