Control method and device of double-ejector system, medium, fuel cell and vehicle

Abstract

The invention relates to the technical field of fuel cell control, and particularly discloses a control method and device of a double-ejector system, a medium, a fuel cell and a vehicle. In the control method of the double-ejector system, firstly, the hydrogen pressure target value range and the hydrogen concentration target value range of the fuel cell are obtained; the hydrogen flow of the fuel cell is observed through a sliding film observer to obtain a hydrogen pressure observation value, an actual hydrogen concentration value is observed and calculated through an EKF observer, and if the hydrogen pressure observation value is not within the hydrogen pressure target value range, a first proportional valve and / or a second proportional valve are / is controlled; if the actual hydrogen concentration value is lower than the hydrogen concentration target value range, a hydrogen discharge valve, a first proportional valve and a second proportional valve are controlled, so that the actual hydrogen pressure value of the fuel cell is within the hydrogen pressure target value range, and meanwhile, the actual hydrogen concentration value is also within the hydrogen concentration target value range, so that the hydrogen pressure can be controlled to be stable; the hydrogen concentration is ensured.

Description

Technical Field

[0001] This invention relates to the field of fuel cell control technology, and in particular to a control method and apparatus for a dual ejector system, a medium, a fuel cell, and a vehicle. Background Technology

[0002] Currently, most fuel cell hydrogen subsystems use a hybrid supply scheme of ejector and hydrogen pump to meet system power requirements. However, hydrogen pumps have drawbacks such as high power consumption, high hardware cost, and high noise. A single ejector is also difficult to meet the full power range requirements. Therefore, the development of a dual-ejector hydrogen circulation system is needed to circumvent this problem. How to control the dual ejectors to achieve stable hydrogen pressure and meet the engine operation requirements has become a current challenge.

[0003] Dual ejectors currently face problems such as slow instantaneous response, poor anti-interference ability, poor ejection effect under low power conditions, difficulty in coordinating the control of the two proportional valves, and easy fluctuation of hydrogen pressure when opening and closing hydrogen discharge valves. Therefore, it is crucial to achieve accurate control of the opening of the two proportional valves to stabilize the hydrogen flow and thus ensure stable hydrogen pressure during the operation of the engine across the full power range. Furthermore, it requires a rapid and stable dynamic instantaneous response.

[0004] The control technology in the relevant technologies can only achieve stable hydrogen pressure control during steady-state operation without hydrogen discharge and drainage. It is difficult to smoothly and quickly switch between two ejectors or multiple operating modes in different power ranges. The complexity and accuracy of the control algorithm also become its technical challenges. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a control method for a dual ejector system that can smoothly switch the operating modes of a fuel cell, control hydrogen pressure stability, and achieve stable engine operation under both steady-state and dynamic conditions across the entire power range.

[0006] A second objective of this invention is to provide a computer-readable storage medium.

[0007] The third objective of this invention is to provide a control device for a dual ejector system.

[0008] The fourth objective of this invention is to provide a fuel cell.

[0009] The fifth objective of this invention is to provide a vehicle.

[0010] To achieve the above objectives, a first aspect of the present invention provides a control method for a dual ejector system applied to a fuel cell. The dual ejector system includes a first ejector, a second ejector, a first proportional valve, a second proportional valve, a gas-liquid separator, a hydrogen discharge valve, and a drain valve. The first proportional valve is connected to the high-pressure inlet of the first ejector, and the medium-pressure outlet of the first ejector is connected to the fuel cell. The second proportional valve is connected to the high-pressure inlet of the second ejector, and the medium-pressure outlet of the second ejector is connected to the high-pressure / medium-pressure outlet of the first ejector. The inlet of the gas-liquid separator is connected to the fuel cell, and the outlet of the gas-liquid separator is connected to the hydrogen discharge valve, the low-pressure inlet of the first ejector, and the low-pressure inlet of the second ejector. The drain outlet of the gas-liquid separator is connected to the... The method for connecting a drain valve includes: acquiring the target range of hydrogen pressure and the target range of hydrogen concentration for the fuel cell; observing the hydrogen flow rate of the fuel cell based on a sliding film observer to obtain the observed hydrogen pressure value of the fuel cell; and calculating the actual hydrogen concentration value of the fuel cell based on an EKF (Extended Kalman Filter) observer; controlling the first proportional valve and / or the second proportional valve according to the observed hydrogen pressure value and the target range of hydrogen pressure; and controlling the hydrogen discharge valve, the first proportional valve, and the second proportional valve according to the actual hydrogen concentration value and the target range of hydrogen concentration, so that the actual hydrogen pressure value of the fuel cell is within the target range of hydrogen pressure and the actual hydrogen concentration value is within the target range of hydrogen concentration.

[0011] In the control method of the dual ejector system of this invention, the target range of hydrogen pressure and hydrogen concentration of the fuel cell are first obtained. The hydrogen flow rate of the fuel cell is observed by a sliding film observer to obtain the observed hydrogen pressure value. The actual hydrogen concentration value is observed and calculated by an EKF observer. If the observed hydrogen pressure value is not within the target hydrogen pressure range, the first proportional valve and / or the second proportional valve can be controlled. If the actual hydrogen concentration value is lower than the target hydrogen concentration range, the hydrogen discharge valve, the first proportional valve, and the second proportional valve are controlled to ensure that the actual hydrogen pressure value of the fuel cell is within the target hydrogen pressure range and the actual hydrogen concentration value is also within the target hydrogen concentration range. This allows for smooth switching of the fuel cell's operating mode, stable hydrogen pressure control, and guaranteed hydrogen concentration, thereby achieving the goal of stable engine operation under steady-state and dynamic conditions across the entire power range.

[0012] In some embodiments of the present invention, the method further includes: when the fuel cell engine increases its power, controlling the second proportional valve to open and controlling the first proportional valve to be within a preset opening range; re-acquiring the target range of hydrogen pressure of the fuel cell and the observed hydrogen pressure value observed by the sliding film observer; and controlling the second proportional valve according to the re-acquiring target range of hydrogen pressure and the observed hydrogen pressure value.

[0013] In some embodiments of the present invention, the method further includes: when the fuel cell engine increases its power, acquiring the current change value of the fuel cell between two adjacent moments; when the current change value is greater than a preset current change value, determining a feedforward control quantity based on the current change value to control the first proportional valve and the second proportional valve; when the current change value is less than or equal to the preset current change value, determining a feedforward control quantity based on the current change value to control the first proportional valve.

[0014] In some embodiments of the present invention, the method further includes: adjusting the first proportional valve and the second proportional valve in conjunction with PI control based on the hydrogen pressure observation value observed by the sluice window observer.

[0015] In some embodiments of the present invention, the method further includes: when the fuel cell engine reduces power, controlling the second proportional valve to reduce its opening degree first, based on the target range of hydrogen pressure of the fuel cell and the observed hydrogen pressure value, until the second proportional valve is in a closed state, and then controlling the first proportional valve to reduce its opening degree.

[0016] In some embodiments of the present invention, the opening adjustment range of the first proportional valve is smaller than the opening adjustment range of the second proportional valve.

[0017] To achieve the above objectives, a second aspect of the present invention provides a computer-readable storage medium storing a control program for a dual ejector system, wherein when the control program is executed by a processor, it implements the control method for the dual ejector system described in any of the above embodiments.

[0018] The computer-readable storage medium of this invention executes the control program of the dual ejector system stored thereon through a processor, which can smoothly switch the working mode of the fuel cell, control the hydrogen pressure to stabilize, ensure the hydrogen concentration, and achieve the goal of stable operation of the engine in both steady state and dynamic conditions across the full power range.

[0019] To achieve the above objectives, a third aspect of the present invention, in embodiment one, provides a control device for a dual ejector system applied to a fuel cell. The dual ejector system includes a first ejector, a second ejector, a first proportional valve, a second proportional valve, a gas-liquid separator, a hydrogen discharge valve, and a drain valve. The first proportional valve is connected to the high-pressure inlet of the first ejector, and the medium-pressure outlet of the first ejector is connected to the fuel cell. The second proportional valve is connected to the high-pressure inlet of the second ejector, and the medium-pressure outlet of the second ejector is connected to the high-pressure and medium-pressure outlet of the first ejector. The inlet of the gas-liquid separator is connected to the fuel cell, and the outlet of the gas-liquid separator is connected to the hydrogen discharge valve, the low-pressure inlet of the first ejector, and the low-pressure inlet of the second ejector. The drain outlet of the gas-liquid separator is connected to the... The device, connected to the drain valve, includes: an acquisition module for acquiring the target range of hydrogen pressure and the target range of hydrogen concentration of the fuel cell, obtaining the observed hydrogen pressure of the fuel cell based on the observed hydrogen flow rate of the fuel cell, and calculating the actual hydrogen concentration of the fuel cell based on observations by an EKF observer; and a control module for controlling the first proportional valve and / or the second proportional valve according to the observed hydrogen pressure and the target range of hydrogen pressure, and controlling the hydrogen discharge valve, the first proportional valve, and the second proportional valve according to the actual hydrogen concentration and the target range of hydrogen concentration, so that the actual hydrogen pressure of the fuel cell is within the target range of hydrogen pressure and the actual hydrogen concentration is within the target range of hydrogen concentration.

[0020] The control device of the dual ejector system in this embodiment of the invention includes an acquisition module and a control module. First, the acquisition module acquires the target range of hydrogen pressure and hydrogen concentration of the fuel cell, and observes the hydrogen flow rate of the fuel cell through a sliding film observer to obtain the observed hydrogen pressure value. It also observes and calculates the actual hydrogen concentration value through an EKF observer. If the observed hydrogen pressure value is not within the target range of hydrogen pressure, the first proportional valve and / or the second proportional valve can be controlled. If the actual hydrogen concentration value is lower than the target range of hydrogen concentration, the hydrogen discharge valve, the first proportional valve, and the second proportional valve are controlled to ensure that the actual hydrogen pressure of the fuel cell is within the target range of hydrogen pressure, and the actual hydrogen concentration value is also within the target range of hydrogen concentration. This allows for smooth switching of the fuel cell's operating mode, stable hydrogen pressure control, and guaranteed hydrogen concentration, thereby achieving the goal of stable engine operation under steady-state and dynamic conditions across the entire power range.

[0021] To achieve the above objectives, a fourth aspect of the present invention provides a fuel cell that includes a control device for the dual ejector system described in the above embodiments.

[0022] The fuel cell of this invention, through the control device of the dual ejector system in the above embodiments, can smoothly switch the working mode of the fuel cell, control the hydrogen pressure to be stable, ensure the hydrogen concentration, and achieve the purpose of stable operation of the engine in both steady state and dynamic conditions across the entire power range.

[0023] To achieve the above objectives, a fifth aspect of the present invention provides a vehicle that includes the fuel cell described in the above embodiments.

[0024] The vehicle of this invention, through the fuel cell of the above embodiment, can smoothly switch the working mode of the fuel cell, control the hydrogen pressure to be stable, ensure the hydrogen concentration, and achieve the purpose of stable engine operation under steady state and dynamic conditions across the entire power range.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a dual ejector system in one embodiment of the present invention; Figure 2 This is a flowchart of a control method for a dual ejector system in one embodiment of the present invention; Figure 3 This is a flowchart of the control method for a dual ejector system in a specific embodiment of the present invention; Figure 4 This is a block diagram of the control device of the dual ejector system in an embodiment of the present invention; Figure 5 This is a block diagram of a fuel cell according to an embodiment of the present invention; Figure 6 This is a vehicle block diagram according to an embodiment of the present invention. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] The control method and apparatus of the dual ejector system, the medium, the fuel cell, and the vehicle of the present invention are described below with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the structure of a dual ejector system in one embodiment of the present invention.

[0030] like Figure 1As shown, the dual ejector system includes a first ejector, a second ejector, a first proportional valve, a second proportional valve, a gas-liquid separator, a hydrogen discharge valve, and a drain valve. The first proportional valve is connected to the high-pressure inlet of the first ejector, and the medium-pressure outlet of the first ejector is connected to the fuel cell. The second proportional valve is connected to the high-pressure inlet of the second ejector, and the medium-pressure outlet of the second ejector is connected to the high-pressure and medium-pressure outlet of the first ejector. The inlet of the gas-liquid separator is connected to the fuel cell, and the outlet of the gas-liquid separator is connected to the hydrogen discharge valve, the low-pressure inlet of the first ejector, and the low-pressure inlet of the second ejector. The drain outlet of the gas-liquid separator is connected to the drain valve. The opening adjustment range of the first proportional valve is smaller than that of the second proportional valve, and the first ejector (i.e., ejector 1) is included in the second ejector (i.e., ejector 2), sharing a single hydrogen return pipeline. This achieves bipolar ejection, saving cost and space compared to other methods that require an electrically controlled three-way valve to adjust the flow rate of the dual ejectors, and enabling smooth switching.

[0031] Figure 2 This is a flowchart of the control method for a dual ejector system in one embodiment of the present invention.

[0032] like Figure 2 As shown, this invention proposes a control method for a dual ejector system, which includes the following steps: S10: Obtain the target range of hydrogen pressure and hydrogen concentration for the fuel cell, and obtain the observed hydrogen pressure value of the fuel cell by observing the hydrogen flow rate of the fuel cell based on the sliding film observer, and calculate the actual hydrogen concentration value of the fuel cell based on the observation of the EKF observer.

[0033] S20, control the first proportional valve and / or the second proportional valve according to the observed hydrogen pressure value and the target hydrogen pressure range, and control the hydrogen discharge valve, the first proportional valve and the second proportional valve according to the actual hydrogen concentration value and the target hydrogen concentration range, so that the actual hydrogen pressure value of the fuel cell is within the target hydrogen pressure range and the actual hydrogen concentration value is within the target hydrogen concentration range.

[0034] Specifically, this embodiment can employ the anode sliding film observer integral control method, which is based on the pressure mathematical model of the anode system. The pressure parameters in the model include hydrogen intake and exhaust rates, reaction consumption, and system parameters, etc. The pressure mathematical model is shown below: Among them, R, T, V and M H2 These are the hydrogen gas constant, system temperature, system volume, and molar mass of hydrogen, respectively. This refers to the amount of hydrogen gas entering the system. It refers to engine displacement. This refers to the amount consumed in the reaction. The amount consumed in the reaction is calculated using a formula. , , F The parameters are the number of fuel cell stack plates, the molar mass of hydrogen, the Faraday constant, and the fuel cell stack current, respectively. The intake flow rate is obtained from the characteristics of the dual-ejector proportional valve and is related to the proportional valve opening. This yields the total intake flow rate at different openings, forming an observer feedforward. The exhaust flow rate is monitored by a sensor system. The observer calculation model is: Observed flow rate = R*(T+273) / (2*V)*(Total flow rate – Exhaust flow rate – Reaction rate + Error correction). The flow rate observed by the observer, combined with the model error correction controller, controls the proportional valve opening, ultimately achieving closed-loop hydrogen pressure control. In steady state, the control is stable and, compared to PI control, the flow feedforward recognition provides timely response, avoiding the slow response and oscillating characteristics of PI control. This embodiment adds a dynamic compensation strategy when the hydrogen discharge valve is open. A hydrogen concentration observer estimates the hydrogen concentration, which is then used to control the proportional valve and the hydrogen discharge valve to stabilize hydrogen pressure and improve hydrogen utilization. The hydrogen concentration observation relies on Dalton's law of partial pressures. ,in Based on water vapor saturation Indicates hydrogen concentration. This indicates the nitrogen concentration. The nitrogen concentration requires calculating the amount of nitrogen permeating to the anode, which is related to the permeability. Therefore, it is assumed that pure hydrogen is purged before operation, with a default hydrogen concentration close to 100%. The nitrogen content during operation is the current... =Previous moment + (Nitrogen permeability * stack current * time) - Amount of nitrogen discharged when the hydrogen vent valve is open; dynamic equation for nitrogen. = R*T ( - + ), The nitrogen permeation flow rate is related to the current and pressure difference. This part is calculated based on the characteristics of the fuel cell stack. Simultaneously, the hydrogen content is calculated from the total gas content, leading to the hydrogen concentration. An EKF (Extended Kalman Filter) observer is used to correct for errors. The opening and closing of the hydrogen discharge valve are then controlled by the hydrogen concentration, while the proportional valve is dynamically compensated to maintain pressure stability and increase the hydrogen concentration. This method can accurately control the opening and closing time of the hydrogen discharge valve based on the hydrogen concentration, avoiding excessive hydrogen discharge and waste. The actual hydrogen partial pressure and total pressure can be detected using the hydrogen concentration, and combined with the hydrogen flow rate, the proportional valve is controlled to compensate for the corresponding new hydrogen. Since the opening time of the hydrogen discharge valve is controlled according to the hydrogen concentration requirements, the amount of gas discharged within the corresponding time can be calculated as the basic compensation value. This is further combined with the different hydrogen discharge amounts at different power levels and the front-end flow rate for dynamic compensation, thereby maintaining stable total hydrogen pressure and ensuring normal system operation. Compared to control methods that only observe hydrogen flow rate to control hydrogen pressure, this control method can compensate for pressure fluctuations caused by hydrogen discharge and constantly monitor the hydrogen concentration to avoid hydrogen shortage.

[0035] Based on an algorithm, the hydrogen discharge valve can be controlled in real time and corresponding compensation can be obtained. This improves upon the traditional calibration method that requires the deployment of hydrogen concentration sensors in the system to calibrate the hydrogen discharge strategy at various power levels. This simplifies the calibration process and saves calibration costs. Simultaneously, real-time control is possible, preventing hydrogen shortages during prolonged operation and resolving the issues of slow dynamic response and poor anti-interference capability in hydrogen circulation dual-ejector systems. Regarding the drainage strategy, the amount of water produced on the anode side of the fuel cell stack is calculated based on the current current. The theoretical amount of water permeating to the anode side is then calculated. Returning to the gas-liquid separator, this calculation, combined with the separator's efficiency and the amount of water discharged per second when the drain valve is opened, precisely controls the valve's opening time to achieve stable hydrogen pressure control.

[0036] In some embodiments of the present invention, the control method of the dual ejector system further includes: controlling the second proportional valve to open and controlling the first proportional valve to be within a preset opening range when the fuel cell engine increases power; re-acquiring the target range of hydrogen pressure of the fuel cell and the observed hydrogen pressure value observed by the sliding film observer; and controlling the second proportional valve according to the re-acquiring target range of hydrogen pressure and the observed hydrogen pressure value.

[0037] In some embodiments of the present invention, the control method of the dual ejector system further includes: when the fuel cell engine increases power, acquiring the current change value of the fuel cell between two adjacent moments; when the current change value is greater than a preset current change value, determining a feedforward control quantity based on the current change value to control the first proportional valve and the second proportional valve; when the current change value is less than or equal to the preset current change value, determining a feedforward control quantity based on the current change value to control the first proportional valve.

[0038] In some embodiments of the present invention, the control method of the dual ejector system further includes: adjusting the first proportional valve and the second proportional valve in conjunction with PI control based on the hydrogen pressure observation value observed by the sliding diaphragm observer.

[0039] In some embodiments of the present invention, the control method of the dual ejector system further includes: when the fuel cell engine reduces power, controlling the second proportional valve to reduce its opening degree first, based on the target range of hydrogen pressure and the observed value of hydrogen pressure in the fuel cell, until the second proportional valve is in a closed state, and then controlling the first proportional valve to reduce its opening degree.

[0040] Specifically, for how to achieve smooth and rapid switching of operating modes between dual ejectors at different power levels, see [link to relevant documentation]. Figure 3 To achieve smooth switching control of the dual ejectors, feedforward identification and feedback regulation are required. Feedforward identification establishes a power switching identification mode by comparing the power at one moment with that at the previous moment, detecting changes in the fuel cell current, and calculating the corresponding dual ejector mode (small ejector individual control mode, large and small ejector joint control mode, etc.) at that power. This feedforward control is then sent to the proportional valve. Simultaneously, the hydrogen partial pressure observed by the observer is used to couple PI control for joint regulation. When the large proportional valve just starts working, the opening of the small proportional valve is locked according to the flow demand, i.e., according to the flow requirement. The opening of the small proportional valve is locked within a specified range to prevent it from affecting hydrogen pressure fluctuations. The opening of the large proportional valve is then adjusted in conjunction with the P value and the observer's error. At this point, only the P value needs to be coupled, as I will conflict with the observer's adjustment and cause oscillations. This also avoids hydrogen pressure fluctuations caused by the simultaneous adjustment of both valves (the large proportional valve changes from open to closed and the small proportional valve also adjusts at the same time) due to the observed flow change during switching. The switching point is converted into a single valve body adjustment, which makes up for the problem of untimely correction of hydrogen pressure fluctuations during mode switching caused by the single observer integral control.

[0041] In summary, the control method of the dual ejector system in this embodiment of the invention can smoothly switch the operating mode of the fuel cell, control the hydrogen pressure to stabilize, and achieve the goal of stable engine operation under steady-state and dynamic conditions across the entire power range.

[0042] Furthermore, the present invention proposes a computer-readable storage medium storing a control program for a dual ejector system. When the control program is executed by a processor, it implements the control method for any of the dual ejector systems described in the above embodiments.

[0043] The computer-readable storage medium of this invention executes the control program of the dual ejector system stored thereon through a processor, which can smoothly switch the operating mode of the fuel cell, control the hydrogen pressure to stabilize, and achieve the goal of stable operation of the engine in both steady state and dynamic conditions across the full power range.

[0044] Figure 4This is a block diagram of the control device for the dual ejector system in an embodiment of the present invention.

[0045] Furthermore, such as Figure 4 As shown, this invention proposes a control device 400 for a dual ejector system, which is applied to a fuel cell, such as... Figure 1 As shown, the dual ejector system includes a first ejector, a second ejector, a first proportional valve, a second proportional valve, a gas-liquid separator, a hydrogen discharge valve, and a drain valve. The first proportional valve is connected to the high-pressure inlet of the first ejector, and the medium-pressure outlet of the first ejector is connected to the fuel cell. The second proportional valve is connected to the high-pressure inlet of the second ejector, and the medium-pressure outlet of the second ejector is connected to the high-pressure and medium-pressure outlet of the first ejector. The inlet of the gas-liquid separator is connected to the fuel cell, and the outlet of the gas-liquid separator is connected to the hydrogen discharge valve, the low-pressure inlet of the first ejector, and the low-pressure inlet of the second ejector. The drain outlet of the gas-liquid separator is connected to the drain valve. The control device 400 of the dual ejector system includes an acquisition module 401 and a control module 402.

[0046] The acquisition module 401 is used to acquire the target range of hydrogen pressure and the target range of hydrogen concentration of the fuel cell, and to obtain the observed value of hydrogen pressure of the fuel cell by observing the hydrogen flow rate of the fuel cell based on the sliding film observer, and to calculate the actual value of hydrogen concentration of the fuel cell based on the observation of the EKF observer; the control module 402 is used to control the first proportional valve and / or the second proportional valve according to the observed value of hydrogen pressure and the target range of hydrogen pressure, and to control the hydrogen discharge valve, the first proportional valve and the second proportional valve according to the actual value of hydrogen concentration and the target range of hydrogen concentration, so that the actual value of hydrogen pressure of the fuel cell is within the target range of hydrogen pressure and the actual value of hydrogen concentration is within the target range of hydrogen concentration.

[0047] In some embodiments of the present invention, the control module 402 is further configured to: control the second proportional valve to open and control the first proportional valve to be within a preset opening range when the fuel cell engine increases power; reacquire the target range of hydrogen pressure of the fuel cell and the observed hydrogen pressure value observed by the sliding film observer; and control the second proportional valve according to the reacquired target range of hydrogen pressure and the observed hydrogen pressure value.

[0048] In some embodiments of the present invention, the acquisition module 401 is further configured to: acquire the current change value of the fuel cell between two adjacent moments when the fuel cell engine increases power; the control module 402 is further configured to: when the current change value is greater than a preset current change value, determine a feedforward control quantity based on the current change value to control the first proportional valve and the second proportional valve; when the current change value is less than or equal to the preset current change value, determine a feedforward control quantity based on the current change value to control the first proportional valve.

[0049] In some embodiments of the present invention, the control module 402 is further configured to: adjust the first proportional valve and the second proportional valve in conjunction with PI control based on the hydrogen pressure observation value observed by the slid diaphragm observer.

[0050] In some embodiments of the present invention, the control module 402 is further configured to: when the fuel cell engine reduces power, control the second proportional valve to reduce its opening degree first, based on the target range of hydrogen pressure of the fuel cell and the observed value of hydrogen pressure, until the second proportional valve is in a closed state, and then control the first proportional valve to reduce its opening degree.

[0051] In some embodiments of the present invention, the opening adjustment range of the first proportional valve is smaller than that of the second proportional valve.

[0052] It should be noted that the specific implementation of the control device of the dual ejector system in this embodiment can be found in the specific implementation of the control method of the dual ejector system in the above embodiments. To avoid redundancy, it will not be described again here.

[0053] In summary, the control device of the dual ejector system in this embodiment of the invention can smoothly switch the working mode of the fuel cell, control the hydrogen pressure to be stable, ensure the hydrogen concentration, and achieve the goal of stable operation of the engine in both steady state and dynamic conditions across the entire power range.

[0054] Figure 5 This is a block diagram of a fuel cell according to an embodiment of the present invention.

[0055] Furthermore, such as Figure 5 As shown, the present invention proposes a fuel cell 500, which includes a control device 400 for the dual ejector system of the above embodiment.

[0056] The fuel cell of this invention, through the control device of the dual ejector system in the above embodiments, can smoothly switch the working mode of the fuel cell, control the hydrogen pressure to be stable, ensure the hydrogen concentration, and achieve the purpose of stable operation of the engine in both steady state and dynamic conditions across the entire power range.

[0057] Figure 6 This is a vehicle block diagram according to an embodiment of the present invention.

[0058] Furthermore, such as Figure 6 As shown, the present invention proposes a vehicle 600, which includes the fuel cell 500 of the above embodiment.

[0059] The vehicle of this invention, through the fuel cell of the above embodiment, can smoothly switch the working mode of the fuel cell, control the hydrogen pressure to be stable, ensure the hydrogen concentration, and achieve the purpose of stable engine operation under steady state and dynamic conditions across the entire power range.

[0060] Furthermore, other components and functions of the vehicle in the embodiments of the present invention are known to those skilled in the art, and will not be described in detail here to reduce redundancy.

[0061] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0062] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0063] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this invention can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this invention, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0066] In this invention, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific implementation.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for a dual ejector system, characterized in that, Applied to fuel cells, the dual ejector includes a first ejector, a second ejector, a first proportional valve, a second proportional valve, a gas-liquid separator, a hydrogen discharge valve, and a drain valve. The first proportional valve is connected to the high-pressure inlet of the first ejector, and the medium-pressure outlet of the first ejector is connected to the fuel cell. The second proportional valve is connected to the high-pressure inlet of the second ejector, and the medium-pressure outlet of the second ejector is connected to the high-medium-pressure outlet of the first ejector. The inlet of the gas-liquid separator is connected to the fuel cell, the outlet of the gas-liquid separator is connected to the hydrogen discharge valve, the low-pressure inlet of the first ejector, and the low-pressure inlet of the second ejector, and the drain outlet of the gas-liquid separator is connected to the drain valve. The method includes: The target range of hydrogen pressure and hydrogen concentration of the fuel cell are obtained, and the hydrogen flow rate of the fuel cell is observed based on the sliding film observer to obtain the observed value of hydrogen pressure of the fuel cell. The actual value of hydrogen concentration of the fuel cell is calculated based on the observation of the EKF observer. The first proportional valve and / or the second proportional valve are controlled according to the observed hydrogen pressure value and the target hydrogen pressure range, and the hydrogen discharge valve, the first proportional valve, and the second proportional valve are controlled according to the actual hydrogen concentration value and the target hydrogen concentration range, so that the actual hydrogen pressure value of the fuel cell is within the target hydrogen pressure range and the actual hydrogen concentration value is within the target hydrogen concentration range.

2. The control method for the dual ejector system according to claim 1, characterized in that, The method further includes: When the fuel cell engine increases its power, the second proportional valve is controlled to open, and the first proportional valve is controlled to be within a preset opening range. Reacquire the target range of hydrogen pressure for the fuel cell and the observed hydrogen pressure values ​​from the sliding diaphragm observer; The second proportional valve is controlled based on the reacquired target range of hydrogen pressure and the observed hydrogen pressure value.

3. The control method for the dual ejector system according to claim 2, characterized in that, The method further includes: When the fuel cell engine increases its power, the current change value of the fuel cell between two adjacent moments is obtained; When the current change value is greater than the preset current change value, a feedforward control quantity is determined based on the current change value to control the first proportional valve and the second proportional valve; When the current change value is less than or equal to the preset current change value, a feedforward control quantity is determined based on the current change value to control the first proportional valve.

4. The control method for the dual ejector system according to claim 3, characterized in that, The method further includes: The first proportional valve and the second proportional valve are adjusted in conjunction with the hydrogen pressure observation value observed by the diaphragm observer and coupled with PI control.

5. The control method for the dual ejector system according to claim 2, characterized in that, The method further includes: When the fuel cell engine reduces power, the second proportional valve is first controlled to reduce its opening based on the target range of hydrogen pressure and the observed hydrogen pressure value of the fuel cell. Once the second proportional valve is closed, the first proportional valve is then controlled to reduce its opening.

6. The control method for the dual ejector system according to any one of claims 1-5, characterized in that, The opening adjustment range of the first proportional valve is smaller than that of the second proportional valve.

7. A computer-readable storage medium, characterized in that, It stores a control program for a dual ejector system, which, when executed by a processor, implements the control method for the dual ejector system according to any one of claims 1-6.

8. A control device for a dual ejector system, characterized in that, Applied to fuel cells, the dual ejector includes a first ejector, a second ejector, a first proportional valve, a second proportional valve, a gas-liquid separator, a hydrogen discharge valve, and a drain valve. The first proportional valve is connected to the high-pressure inlet of the first ejector, and the medium-pressure outlet of the first ejector is connected to the fuel cell. The second proportional valve is connected to the high-pressure inlet of the second ejector, and the medium-pressure outlet of the second ejector is connected to the high-medium-pressure outlet of the first ejector. The inlet of the gas-liquid separator is connected to the fuel cell, the outlet of the gas-liquid separator is connected to the hydrogen discharge valve, the low-pressure inlet of the first ejector, and the low-pressure inlet of the second ejector, and the drain outlet of the gas-liquid separator is connected to the drain valve. The device includes: The acquisition module is used to acquire the target range of hydrogen pressure and the target range of hydrogen concentration of the fuel cell, and to obtain the observed value of hydrogen pressure of the fuel cell by observing the hydrogen flow rate of the fuel cell based on the sliding film observer, and to calculate the actual value of hydrogen concentration of the fuel cell based on the observation of the EKF observer. The control module is configured to control the first proportional valve and / or the second proportional valve according to the observed hydrogen pressure value and the target hydrogen pressure range, and to control the hydrogen discharge valve, the first proportional valve, and the second proportional valve according to the actual hydrogen concentration value and the target hydrogen concentration range, so that the actual hydrogen pressure value of the fuel cell is within the target hydrogen pressure range and the actual hydrogen concentration value is within the target hydrogen concentration range.

9. A fuel cell, characterized in that, The control device includes the dual ejector system as described in claim 8.

10. A vehicle, characterized in that, Includes the fuel cell described in claim 9.

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