Pressure control method and device of fuel cell, storage medium and electronic equipment

Abstract

The invention relates to a pressure control method and device of a fuel cell, a storage medium and electronic equipment. The method comprises the following steps: if the valve state of an exhaust valve of the fuel cell is an open state, acquiring outlet state information corresponding to the exhaust valve, gas inlet state information corresponding to a gas inlet valve, a current compensation opening degree and a closed-loop gas inlet valve opening degree; the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve air inlet temperature are input into a preset flow calculation model for flow calculation, and the air outlet flow of the exhaust valve is obtained; based on the air outlet flow, the air inlet state information and a preset flow calculation model, determining the exhaust compensation opening degree corresponding to the air inlet valve; and opening control is performed on the intake valve based on the current compensation opening, the closed-loop intake valve opening and the exhaust compensation opening, so that the pressure of the fuel cell is kept at the initial pressure. The method can avoid pressure fluctuation when the exhaust valve of the fuel cell is opened and gas enters a pile, and ensures stable flow and pressure of the gas entering the pile.

Description

Technical Field

[0001] The present disclosure relates to the field of fuel cell technology, and in particular to a pressure control method, device, storage medium and electronic device for a fuel cell. Background Art

[0002] In fuel cells, proton exchange membrane fuel cells are energy devices that directly convert the chemical energy of hydrogen-oxygen reactions into electrical energy. The reaction directly generates water, has no pollutant emissions, and is highly efficient. As hydrogen is the main fuel, the hydrogen proportional valve needs to be adjusted to achieve precise control of the flow rate and pressure of hydrogen entering the stack. However, during the anode exhaust stage, the flow rate and pressure of hydrogen entering the stack will fluctuate.

[0003] In the prior art, the hydrogen pressure control of the fuel cell system is mainly adjusted by a closed-loop control method, namely, the proportional-integral-derivative (PID) mode, that is, the proportional valve opening is adjusted after a deviation occurs between the actual pressure and the target pressure. It is difficult to avoid fluctuations in the hydrogen inflow flow and pressure when the exhaust valve is opened, especially under high current density conditions. Summary of the invention

[0004] In order to solve at least one of the above-mentioned technical problems, the present disclosure proposes a pressure control method, a device, a storage medium and an electronic device for a fuel cell.

[0005] According to one aspect of the present disclosure, there is provided a pressure control method for a fuel cell, comprising:

[0006] If the valve state of the exhaust valve of the fuel cell is in the open state, obtain the outlet state information corresponding to the exhaust valve, the intake state information corresponding to the intake valve, the current compensation opening and the closed-loop intake valve opening, wherein the outlet state information includes the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature, the current compensation opening is determined based on the current stack current information of the fuel cell, and the closed-loop intake valve opening is determined based on the gas pressure information of the fuel cell;

[0007] Inputting the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve inlet temperature into a preset flow calculation model to perform flow calculation to obtain the exhaust valve outlet flow rate;

[0008] Determining the exhaust compensation opening corresponding to the intake valve based on the outlet air flow, the intake state information and the preset flow calculation model;

[0009] The intake valve opening is controlled based on the current compensation opening, the closed-loop intake valve opening, and the exhaust compensation opening so that the pressure of the fuel cell maintains an initial pressure.

[0010] In some possible implementations, the method further includes:

[0011] Obtaining current stack current information of the fuel cell;

[0012] The current compensation opening is determined based on the current stack current information and a preset current proportional valve opening relationship table, and the preset current proportional valve opening relationship table is used to characterize the mapping relationship between current and intake valve opening.

[0013] In some possible implementations, the method further includes:

[0014] Acquiring gas pressure information of the fuel cell, wherein the gas pressure information includes actual pressure and target pressure;

[0015] Deviation processing is performed based on the actual pressure and the target pressure to obtain the closed-loop intake valve opening.

[0016] In some possible implementations, the method further includes:

[0017] Construct the preset flow calculation model, the preset flow calculation model is as follows:

[0018]

[0019] in, is the gas flow rate, A e is the effective area, P in is the inlet pressure, P out is the outlet pressure, T in is the inlet temperature, R is the universal gas constant, and γ is the diatomic gas adiabatic index.

[0020] In some possible implementations, determining the exhaust compensation opening corresponding to the intake valve based on the outlet flow rate, the intake state information and the preset flow calculation model includes:

[0021] Determine an effective area of ​​an intake valve corresponding to the intake valve based on the outlet flow rate, the intake state information and the preset flow rate calculation model;

[0022] Obtaining a total intake valve area corresponding to the intake valve;

[0023] The exhaust compensation opening corresponding to the intake valve is obtained by performing ratio processing based on the effective area of ​​the intake valve and the total area of ​​the intake valve.

[0024] In some possible implementations, the intake state information includes an intake valve inlet pressure, an intake valve outlet pressure, and an intake valve intake temperature, and determining the intake valve effective area corresponding to the intake valve based on the outlet flow rate, the intake state information, and the preset flow rate calculation model includes:

[0025] Transpose the preset flow calculation model to obtain an effective area calculation model;

[0026] Using the outlet gas flow rate as the gas inlet flow rate corresponding to the inlet valve;

[0027] The gas inlet flow rate, the intake valve inlet pressure, the intake valve outlet pressure and the intake valve intake temperature are input into the effective area calculation model to solve the formula and obtain the intake valve effective area.

[0028] In some possible implementations, the method further includes:

[0029] Detecting the valve state of the exhaust valve;

[0030] If the valve state of the exhaust valve is a closed state, the opening of the intake valve is controlled based on the current compensation opening and the closed-loop intake valve opening.

[0031] According to a second aspect of the present disclosure, there is provided a pressure control device for a fuel cell, the device comprising:

[0032] An information acquisition module, for acquiring, if the valve state of the exhaust valve of the fuel cell is in an open state, outlet state information corresponding to the exhaust valve, intake state information corresponding to the intake valve, current compensation opening and closed-loop intake valve opening corresponding to the exhaust valve, the outlet state information including the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature, the current compensation opening being determined based on the current stack current information of the fuel cell, and the closed-loop intake valve opening being determined based on the gas pressure information of the fuel cell;

[0033] an outlet flow determination module, configured to input the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve inlet temperature into a preset flow calculation model to perform flow calculation to obtain the outlet flow of the exhaust valve;

[0034] an exhaust compensation opening determination module, configured to determine the exhaust compensation opening corresponding to the intake valve based on the outlet flow rate, the intake state information and the preset flow calculation model;

[0035] An intake valve control module is used to control the opening of the intake valve based on the current compensation opening, the closed-loop intake valve opening and the exhaust compensation opening so that the pressure of the fuel cell maintains an initial pressure.

[0036] According to a third aspect of the present disclosure, an electronic device is provided, comprising at least one processor and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the at least one processor implements a fuel cell pressure control method as described in any one of the first aspects by executing the instructions stored in the memory.

[0037] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided, in which at least one instruction or at least one program is stored, and the at least one instruction or at least one program is loaded and executed by a processor to implement a fuel cell pressure control method as described in any one of the first aspects.

[0038] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0039] The implementation of this disclosure has the following beneficial effects:

[0040] If the valve state of the exhaust valve of the fuel cell is in the open state, obtain the outlet state information corresponding to the exhaust valve, the intake state information corresponding to the intake valve, the current compensation opening and the closed-loop intake valve opening, the outlet state information includes the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature, the current compensation opening is determined based on the current stack current information of the fuel cell, and the closed-loop intake valve opening is determined based on the gas pressure information of the fuel cell; the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature are input into the preset flow calculation model for flow calculation to obtain the exhaust valve outlet flow; the exhaust compensation opening corresponding to the intake valve is determined based on the outlet flow, the intake state information and the preset flow calculation model; the intake valve opening is controlled based on the current compensation opening, the closed-loop intake valve opening and the exhaust compensation opening to keep the pressure of the fuel cell at the initial pressure. The outlet flow rate of the exhaust valve is obtained based on the relevant status information of the exhaust valve after the exhaust valve is opened. The intake compensation opening of the intake valve is determined by the outlet flow rate of the exhaust valve and the relevant status of the intake valve to ensure the balance between the outlet and the intake. The opening of the intake valve is jointly controlled in combination with the current compensation opening and the closed-loop intake valve opening, thereby avoiding sudden fluctuations inside the fuel cell during exhaust and ensuring the stability of the flow and pressure of the gas entering the stack.

[0041] Further features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments or prior art descriptions. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 A schematic flow chart showing a pressure control method for a fuel cell according to an embodiment of the present disclosure;

[0044] Figure 2 A schematic structural diagram of a gas battery system according to an embodiment of the present disclosure is shown;

[0045] Figure 3 A schematic diagram showing a flow chart of a method for determining a current compensation opening according to an embodiment of the present disclosure;

[0046] Figure 4 A schematic diagram showing a flow chart of a preset current proportional valve opening relationship table according to an embodiment of the present disclosure;

[0047] Figure 5 A schematic diagram showing a flow chart of a closed-loop intake valve opening determination method according to an embodiment of the present disclosure;

[0048] Figure 6 A schematic diagram showing a flow chart of a method for determining an exhaust compensation opening according to an embodiment of the present disclosure;

[0049] Figure 7 A schematic diagram showing a flow chart of a method for determining an effective area of ​​an intake valve according to an embodiment of the present disclosure;

[0050] Figure 8 A schematic flow chart showing a method for controlling the opening degree of an exhaust valve when the exhaust valve is closed according to an embodiment of the present disclosure;

[0051] Fig. 9 A schematic structural diagram of a pressure control device for a fuel cell according to an embodiment of the present disclosure is shown;

[0052] Fig.10 A block diagram of an electronic device according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0055] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0056] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0057] The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set consisting of A, B, and C.

[0058] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present disclosure.

[0059] Figure 1A schematic flow chart of a pressure control method for a fuel cell according to an embodiment of the present disclosure is shown as follows: Figure 1 As shown, the above method includes:

[0060] S101, if the valve state of the exhaust valve of the fuel cell is in the open state, obtain the outlet state information corresponding to the exhaust valve, the intake state information corresponding to the intake valve, the current compensation opening and the closed-loop intake valve opening, the outlet state information includes the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature, the current compensation opening is determined based on the current stack current information of the fuel cell, and the closed-loop intake valve opening is determined based on the gas pressure information of the fuel cell;

[0061] The exhaust valve in the fuel cell is used to control the exhaust of the gas after the reaction in the fuel cell, and the intake valve is used to control the reaction gas to enter the fuel cell. The exhaust valve effective area is used to characterize the opening area of ​​the exhaust valve when the gas passes through the exhaust valve, the exhaust valve inlet pressure is used to characterize the pressure of the gas at the exhaust valve inlet, the exhaust valve outlet pressure is used to characterize the pressure of the gas at the exhaust valve outlet, and the exhaust valve intake temperature is used to characterize the temperature of the gas when it enters the exhaust valve. The current compensation opening is used to characterize the intake valve opening affected by the stack current, and the closed intake valve opening is used to characterize the intake valve opening controlled by the closed-loop control PID.

[0062] In some embodiments, the fuel cell may be a proton exchange membrane fuel cell, which is an energy device that directly converts the chemical energy of hydrogen-oxygen reaction into electrical energy. The reaction directly generates water, has no pollutant emissions, and is highly efficient. Figure 2 As shown, the fuel cell system includes but is not limited to a proportional valve 1, a water and nitrogen discharge valve 2, an ejector 3 and a water vapor separator 4. The proportional valve 1 is the intake valve, and the water and nitrogen discharge valve is the exhaust valve. Hydrogen is the main fuel of the proton exchange membrane fuel cell. Hydrogen enters the stack from the proportional valve 1, i.e., the intake valve, and undergoes a series of reactions. As the reaction proceeds, the concentration of nitrogen in the circulating gas will become higher and higher. After separation by the water vapor separator 4, the water and nitrogen discharge valve 2, i.e., the exhaust valve of the fuel cell needs to be opened to remove nitrogen. However, during the anode exhaust stage, the flow rate and pressure of hydrogen entering the stack will fluctuate, and the intake valve needs to be adjusted to achieve precise control of the flow rate and pressure of hydrogen entering the stack. The outlet state information of the exhaust valve, the intake state information corresponding to the intake valve, the current compensation opening, and the closed-loop intake valve opening are obtained.

[0063] In some embodiments, the valve state of the exhaust valve of the fuel cell is an open state, including the valve state changing from a closed state to an open state. At the moment when the exhaust valve is opened, the stack is connected to the atmosphere, causing the anode inlet pressure in the stack to drop suddenly. The intake valve itself cannot compensate in time, causing the inlet pressure to drop. In this step, it can be determined whether the exhaust valve of the fuel cell changes from a closed state to an open state, and then whether it is necessary to perform exhaust compensation on the inlet pressure in addition to current compensation and closed-loop intake valve compensation.

[0064] S102, inputting the effective area of ​​the exhaust valve, the inlet pressure of the exhaust valve, the outlet pressure of the exhaust valve and the inlet temperature of the exhaust valve into a preset flow calculation model to perform flow calculation to obtain the outlet flow of the exhaust valve;

[0065] The preset flow calculation model is input according to the exhaust valve effective area, exhaust valve inlet pressure, exhaust valve outlet pressure and exhaust valve inlet temperature. The exhaust valve outlet flow rate is calculated in combination with the universal gas constant and the diatomic gas adiabatic index.

[0066] In some embodiments, the specific calculation method of the exhaust valve's outlet flow rate is determined by the ratio of the exhaust valve's inlet pressure to the exhaust valve's outlet pressure.

[0067] S103, determining the exhaust compensation opening corresponding to the intake valve based on the outlet air flow rate, the intake state information and a preset flow calculation model;

[0068] The preset flow calculation model is used to characterize a mathematical model for calculating the gas flow through the effective area of ​​the valve, the inlet pressure, the outlet pressure and the inlet temperature.

[0069] The outlet flow rate of the exhaust valve is used as the inlet flow rate of the intake valve, and the effective area of ​​the intake valve is determined by the inlet flow rate of the intake valve and the intake state information. The exhaust compensation opening of the intake valve affected by the outlet flow rate of the exhaust valve is determined by the effective area of ​​the intake valve and the total area of ​​the intake valve.

[0070] In some embodiments, the preset flow calculation model is converted into a mathematical model that characterizes the gas flow, inlet pressure, outlet pressure and intake temperature through the valve to calculate the effective area. The obtained outlet flow of the exhaust valve is used as the inlet flow of the intake valve, and the inlet flow is used as a known quantity to calculate the effective area of ​​the intake valve. The exhaust compensation opening is determined by the effective area of ​​the intake valve and the total area of ​​the intake valve.

[0071] S104 , controlling the opening of the intake valve based on the current compensation opening, the closed-loop intake valve opening, and the exhaust compensation opening, so that the pressure of the fuel cell maintains the initial pressure.

[0072] The sum of the current compensation opening, the closed-loop intake valve opening and the exhaust compensation opening is the final intake valve opening. The closed-loop intake valve opening can be adjusted and controlled by the PID.

[0073] In some embodiments, the timing of controlling the opening of the intake valve according to the current compensation opening, the closed intake valve opening and the exhaust compensation opening can be synchronous or asynchronous, depending on the actual situation.

[0074] In some embodiments, the exhaust valve effective area, exhaust valve inlet pressure, exhaust valve outlet pressure and exhaust valve intake temperature corresponding to the exhaust valve can be measured and obtained by corresponding measuring devices, which are not limited here.

[0075] In the above technical solution, the proportional valve, i.e., the intake valve, can automatically adjust the opening by using the PID to calculate the closed-loop intake valve opening according to the hydrogen inlet pressure. However, when the exhaust valve is opened, the PID can only be adjusted when the pressure changes. At this time, fluctuations have already occurred. Therefore, the exhaust compensation opening of the intake valve is determined in time by the flow of the exhaust valve, and the exhaust valve opening is adjusted in time in combination with the current compensation opening to avoid fluctuations caused by pressure changes, so as to achieve the purpose of stabilizing the hydrogen inlet flow and pressure when the fuel cell system is exhausted.

[0076] See also Figure 3 In some embodiments, the method further comprises:

[0077] S201, obtaining current stack current information of the fuel cell;

[0078] S202, determining the current compensation opening based on the current stack current information and a preset current proportional valve opening relationship table, where the preset current proportional valve opening relationship table is used to characterize the mapping relationship between the current and the intake valve opening.

[0079] The current stack current information includes the current stack current value. During the operation of the fuel cell stack, the increase in current will cause a change in the pressure inside the stack. For example, the increase in current will accelerate the chemical reaction inside the fuel cell stack, thereby generating more heat and gas, which in turn causes the pressure inside the stack to increase. Therefore, in order to ensure the stability of the pressure inside the fuel cell, the current state of the stack also needs to be considered, and the current compensation opening of the intake valve is determined by the current stack current value. The fuel cell detects the current stack current information of the stack in the fuel cell, queries the preset current proportional valve opening table based on the current stack current information, and determines the current compensation opening.

[0080] In some embodiments, Figure 4As shown, the current unit is ampere (A), the current is the stack current value, and the opening is the current compensation opening. If the current in the preset current proportional valve opening table is 31.5A, the opening is 31%, and when the current is 63, the opening is 32%, and so on. The increase in current is 31.5A, and the increase in opening is not a fixed value. If the current stack current value is between the two currents with known openings in the figure, it can be calculated according to the proportion. For example, if the current stack current value is 47.25A, it is the middle value of the two currents with known openings of 31.5A and 63A. Therefore, the current compensation opening corresponding to the current stack current value of 47.25A is the middle value of 32% and 31%, 31.5%. The current values ​​of unknown openings in other figures can be calculated according to this proportional calculation method. The current value range is [31.5A, 630A].

[0081] The above technical solution takes into account the influence of current on the internal pressure of the fuel cell, further ensures the stability inside the fuel cell, and can quickly determine the current compensation opening by presetting the current proportional valve opening relationship table, thereby improving the efficiency of pressure control.

[0082] See also Figure 5 In some embodiments, the method further comprises:

[0083] S301, obtaining gas pressure information of the fuel cell, where the gas pressure information includes actual pressure and target pressure;

[0084] S302: Perform deviation processing based on the actual pressure and the target pressure to obtain the closed-loop intake valve opening.

[0085] The closed-loop intake valve opening is determined by PID control. The PID control algorithm includes three links: proportional (P), integral (I) and differential (D), which adjust the control amount according to the size of the deviation, the accumulation of the deviation and the changing trend of the deviation.

[0086] In some embodiments, the current actual pressure of the fuel cell and the theoretical target pressure are obtained, the pressure deviation between the actual pressure and the target pressure is calculated, the pressure deviation is input into a preset PID control algorithm, and the closed-loop intake valve opening is calculated.

[0087] The above technical solution can effectively and dynamically adjust the pressure state of the fuel cell by utilizing the opening of the closed-loop intake valve, thereby reducing the impact of pressure fluctuations on the inside of the fuel cell system.

[0088] In some embodiments, the method further comprises:

[0089] Construct a preset traffic calculation model, the preset traffic calculation model is as follows:

[0090]

[0091] in, is the gas flow rate, A e is the effective area, P in is the inlet pressure, P out is the outlet pressure, T in is the inlet temperature, R is the universal gas constant, and γ is the diatomic gas adiabatic index.

[0092] R is the universal gas constant, and its value is 8.314 J / (mol·K). γ is the adiabatic index of diatomic gas, and its value can be 1.4.

[0093] In some embodiments, if the ratio of the exhaust valve outlet pressure and the exhaust valve inlet pressure corresponding to the exhaust valve is greater than or equal to 0.528, the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature corresponding to the exhaust valve are input into the first mathematical model in the preset flow calculation model, i.e., formula (1), and the exhaust flow rate of the exhaust valve, i.e., the outlet flow rate, is calculated. If the ratio of the exhaust valve outlet pressure and the exhaust valve inlet pressure corresponding to the exhaust valve is less than 0.528, the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature corresponding to the exhaust valve are input into the second mathematical model in the preset flow calculation model, i.e., formula (2), and the exhaust flow rate of the exhaust valve, i.e., the outlet flow rate, is calculated.

[0094] The above technical solution constructs a preset flow calculation model so that the outlet flow of the exhaust valve can be quickly calculated through the outlet state information corresponding to the exhaust valve, thereby calculating the inlet flow of the intake valve, further determining the exhaust compensation opening of the intake valve, increasing the hydrogen inlet flow, achieving a balance between gas inlet and outlet, achieving an equal amount of exhaust flow and hydrogen inlet flow, and ensuring the stability of the inlet flow and pressure in the fuel cell.

[0095] See also Figure 6 In some embodiments, the exhaust compensation opening corresponding to the intake valve is determined based on the outlet air flow, the intake state information and the preset flow calculation model, including:

[0096] S1031, determining an effective area of ​​an intake valve corresponding to the intake valve based on the outlet air flow rate, the intake state information and a preset flow rate calculation model;

[0097] S1032, obtaining a total intake valve area corresponding to the intake valve;

[0098] S1033. Perform ratio processing based on the effective area of ​​the intake valve and the total area of ​​the intake valve to obtain the exhaust compensation opening corresponding to the intake valve.

[0099] The exhaust valve outlet flow is converted into the intake valve inlet flow, and the intake valve inlet flow and the intake valve intake state information are brought into the preset flow calculation model to calculate the intake valve effective area. The intake state information includes the intake valve inlet pressure, the intake valve outlet pressure and the intake valve intake temperature. The intake valve intake temperature can be the ambient temperature, which is measured by a temperature measuring device. The total intake valve area is used to characterize the area when the intake valve is fully open.

[0100] In some embodiments, the preset flow calculation model is converted into an effective area calculation model for calculating the effective area, and the inlet flow, intake valve inlet pressure, intake valve outlet pressure and intake temperature of the intake valve corresponding to the intake valve are brought into the effective area model to obtain the intake valve effective area corresponding to the intake valve.

[0101] The above technical solution calculates the effective area corresponding to the intake valve when the exhaust valve is opened through the valve flow calculation model, thereby quickly calculating the intake opening compensation of the intake valve according to the anode exhaust flow, thereby improving the efficiency of gas inflow flow and pressure control and avoiding fluctuations.

[0102] See also Figure 7 In some embodiments, the intake state information includes an intake valve inlet pressure, an intake valve outlet pressure, and an intake valve intake temperature. The intake valve effective area corresponding to the intake valve is determined based on the outlet flow rate, the intake state information, and a preset flow rate calculation model, including:

[0103] S311, performing a transposition transformation on the preset flow calculation model to obtain an effective area calculation model;

[0104] S312, using the outlet gas flow rate as the gas inlet flow rate corresponding to the inlet valve;

[0105] S313, inputting the gas inlet flow rate, the intake valve inlet pressure, the intake valve outlet pressure and the intake valve intake temperature into the effective area calculation model to solve the formula and obtain the intake valve effective area.

[0106] The effective area of ​​the intake valve is used to characterize the opening area of ​​the intake valve when the gas passes through the intake valve, the inlet pressure of the intake valve is used to characterize the pressure of the gas at the inlet of the intake valve, the outlet pressure of the intake valve is used to characterize the pressure of the gas at the outlet of the intake valve, and the intake temperature of the intake valve is used to characterize the temperature of the gas at the inlet of the intake valve. The intake temperature of the intake valve can be the ambient temperature.

[0107] In some embodiments, the intake valve inlet pressure, intake valve outlet pressure and intake valve intake temperature corresponding to the intake valve can be measured and obtained by corresponding measuring devices, which are not limited here.

[0108] In some embodiments, formula (1) and formula (2) in the preset flow calculation model are respectively transformed by equation transposition, and the effective area A is e Move to the left side of the equation and change the gas flow rate Move to the right side of the equation to obtain the third mathematical model obtained by transposing the first mathematical model, i.e., formula (1), and the fourth mathematical model obtained by transposing the second mathematical model, i.e., formula (2), thereby obtaining the effective area calculation model. Convert the outlet flow rate of the outlet valve to the inlet flow rate of the intake valve. If the ratio of the outlet pressure of the intake valve to the inlet pressure of the intake valve is greater than or equal to 0.528, input the inlet flow rate, inlet pressure, outlet pressure and intake temperature of the intake valve corresponding to the intake valve into the third mathematical model of the effective area calculation model to calculate the effective area of ​​the intake valve; if the ratio of the outlet pressure of the intake valve to the inlet pressure of the intake valve is less than 0.528, input the inlet flow rate, inlet pressure, outlet pressure and intake temperature of the intake valve corresponding to the intake valve into the fourth mathematical model of the effective area calculation model to calculate the effective area of ​​the intake valve.

[0109] The above technical solution obtains an effective area calculation model by performing a term shift transformation on the flow calculation model of the valve, thereby quickly calculating the effective area corresponding to the intake valve when the exhaust valve is opened, so as to quickly calculate the intake opening compensation of the intake valve according to the anode exhaust flow, thereby improving the efficiency of gas inflow flow and pressure control and avoiding fluctuations.

[0110] See also Figure 8 In some embodiments, the method further comprises:

[0111] S401, detecting the valve state of the exhaust valve;

[0112] S402: If the valve state of the exhaust valve is in the closed state, the opening of the intake valve is controlled based on the current compensation opening and the closed-loop intake valve opening.

[0113] The valve state of the exhaust valve can be detected and obtained by a valve monitoring device. If the valve state of the exhaust valve is closed, the opening of the intake valve is controlled only based on the current compensation opening and the closed-loop intake valve opening. That is, when the exhaust valve is closed, the final opening of the intake valve is the sum of the current compensation opening and the closed-loop intake valve opening.

[0114] In some embodiments, the valve detection device may be a displacement sensor or other sensors, which are not limited herein. The closed state of the exhaust valve includes a situation where the exhaust valve is converted from an open state to a closed state.

[0115] The above technical solution monitors whether the exhaust valve is open or closed, and timely adjusts the opening control according to the valve state of the exhaust valve to avoid pressure changes caused by the opening or closing of the exhaust valve, thereby achieving the purpose of stabilizing the hydrogen inlet flow and pressure when the fuel cell system is exhausted.

[0116] See also Fig. 9 According to a second aspect of the present disclosure, a pressure control device for a fuel cell is provided, the device comprising:

[0117] The information acquisition module 10 is used to acquire the outlet state information corresponding to the exhaust valve, the intake state information corresponding to the intake valve, the current compensation opening and the closed-loop intake valve opening if the valve state of the exhaust valve of the fuel cell is in the open state, the outlet state information includes the effective area of ​​the exhaust valve, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature, the current compensation opening is determined based on the current stack current information of the fuel cell, and the closed-loop intake valve opening is determined based on the gas pressure information of the fuel cell;

[0118] The outlet flow determination module 20 is used to input the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve inlet temperature into a preset flow calculation model to perform flow calculation to obtain the exhaust valve outlet flow;

[0119] An exhaust compensation opening determination module 30 is used to determine the exhaust compensation opening corresponding to the intake valve based on the outlet air flow rate, the intake state information and a preset flow calculation model;

[0120] The intake valve control module 40 is used to control the opening of the intake valve based on the current compensation opening, the closed-loop intake valve opening and the exhaust compensation opening, so that the pressure of the fuel cell maintains the initial pressure.

[0121] In some embodiments, the apparatus further comprises:

[0122] A current information acquisition module is used to obtain the current stack current information of the fuel cell;

[0123] The query module is used to determine the current compensation opening based on the current stack current information and the preset current proportional valve opening relationship table. The preset current proportional valve opening relationship table is used to characterize the mapping relationship between the current and the intake valve opening.

[0124] In some embodiments, the apparatus further comprises:

[0125] A pressure information acquisition module is used to acquire the gas pressure information of the fuel cell, the gas pressure information includes the actual pressure and the target pressure;

[0126] The deviation processing module is used to perform deviation processing based on the actual pressure and the target pressure to obtain the closed-loop intake valve opening.

[0127] In some embodiments, the apparatus further comprises:

[0128] The model building module is used to build a preset flow calculation model. The preset flow calculation model is as follows:

[0129]

[0130] in, is the gas flow rate, A e is the effective area, P in is the inlet pressure, P oit is the outlet pressure, T in is the inlet temperature, R is the universal gas constant, and γ is the diatomic gas adiabatic index.

[0131] In some embodiments, the exhaust compensation opening determination module 30 includes:

[0132] An effective area determination unit, used to determine an effective area of ​​an intake valve corresponding to the intake valve based on an outlet air flow rate, intake state information and a preset flow rate calculation model;

[0133] A total area acquisition unit, used to acquire a total intake valve area corresponding to the intake valve;

[0134] The ratio processing unit is used to perform ratio processing based on the effective area of ​​the intake valve and the total area of ​​the intake valve to obtain the exhaust compensation opening corresponding to the intake valve.

[0135] In some embodiments, the intake state information includes an intake valve inlet pressure, an intake valve outlet pressure, and an intake valve intake temperature, and the effective area determination unit includes:

[0136] A term shifting unit, used for performing term shifting transformation on a preset flow calculation model to obtain an effective area calculation model;

[0137] A flow conversion unit, used to use the outlet gas flow as the gas inlet flow corresponding to the inlet valve;

[0138] The effective area calculation unit is used to input the gas inlet flow rate, the intake valve inlet pressure, the intake valve outlet pressure and the intake valve intake temperature into the effective area calculation model to solve the formula and obtain the intake valve effective area.

[0139] In some embodiments, the apparatus further comprises:

[0140] A valve detection module, used for detecting the valve status of the exhaust valve;

[0141] The opening control conversion module is used to control the opening of the intake valve based on the current compensation opening and the closed-loop intake valve opening if the valve state of the exhaust valve is in the closed state.

[0142] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the method described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0143] An embodiment of the present application provides a fuel cell pressure control device, which may be a terminal or a server. The fuel cell pressure control device includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or the at least one program is loaded and executed by the processor to implement a fuel cell pressure control method as provided in the above method embodiment.

[0144] The memory can be used to store software programs and modules. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, application programs required for functions, etc.; the data storage area can store data created according to the use of the device, etc. In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory can also include a memory controller to provide the processor with access to the memory.

[0145] The method embodiments provided in the embodiments of the present application can be executed in electronic devices such as mobile terminals, computer terminals, servers or similar computing devices. Fig.10 1 is a hardware structure block diagram of an electronic device for a fuel cell pressure control method provided in an embodiment of the present application. Fig.10As shown, the electronic device 900 may have relatively large differences due to different configurations or performances, and may include one or more central processing units (CPU) 910 (the processor 910 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 930 for storing data, and one or more storage media 920 (such as one or more mass storage devices) for storing application programs 923 or data 922. Among them, the memory 930 and the storage medium 920 can be short-term storage or permanent storage. The program stored in the storage medium 920 may include one or more modules, and each module may include a series of instruction operations in the electronic device. Furthermore, the central processing unit 910 can be configured to communicate with the storage medium 920 to execute a series of instruction operations in the storage medium 920 on the electronic device 900. The electronic device 900 may also include one or more power supplies 960, one or more wired or wireless network interfaces 950, one or more input and output interfaces 940, and / or one or more operating systems 921, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, etc.

[0146] The input / output interface 940 may be used to receive or send data via a network. The specific example of the network may include a wireless network provided by a communication provider of the electronic device 900. In one example, the input / output interface 940 includes a network adapter (NIC), which may be connected to other network devices via a base station so as to communicate with the Internet. In one example, the input / output interface 940 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0147] It can be understood by those skilled in the art that Fig.10 The structure shown is only for illustration and does not limit the structure of the above electronic device. Fig.10 More or fewer components as shown, or with Fig.10 Different configurations are shown.

[0148] An embodiment of the present application also provides a computer-readable storage medium, which can be set in an electronic device to store at least one instruction or at least one program related to a fuel cell pressure control method in a method embodiment. The at least one instruction or the at least one program is loaded and executed by the processor to implement the fuel cell pressure control method provided in the above method embodiment.

[0149] Optionally, in this embodiment, the storage medium may be located in at least one of the multiple network servers of the computer network. Optionally, in this embodiment, the storage medium may include, but is not limited to, various media that can store program codes, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk, or an optical disk.

[0150] According to one aspect of the present application, a computer program product or a computer program is provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the methods provided in the above-mentioned various optional implementations.

[0151] It can be seen from the embodiments of the fuel cell pressure control method, device, equipment, terminal, server, storage medium or computer program provided by the present application that if the valve state of the exhaust valve of the fuel cell is in the open state, the present application obtains the outlet state information corresponding to the exhaust valve, the intake state information corresponding to the intake valve, the current compensation opening and the closed-loop intake valve opening, the outlet state information includes the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature, the current compensation opening is determined based on the current stack current information of the fuel cell, and the closed-loop intake valve opening is determined based on the gas pressure information of the fuel cell; the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature are input into the preset flow calculation model for flow calculation to obtain the exhaust valve outlet flow rate; the exhaust compensation opening corresponding to the intake valve is determined based on the outlet flow rate, the intake state information and the preset flow calculation model; the intake valve opening is controlled based on the current compensation opening, the closed-loop intake valve opening and the exhaust compensation opening to keep the pressure of the fuel cell at the initial pressure. The outlet flow rate of the exhaust valve is obtained based on the relevant status information of the exhaust valve after the exhaust valve is opened. The intake compensation opening of the intake valve is determined by the outlet flow rate of the exhaust valve and the relevant status of the intake valve to ensure the balance between the outlet and the intake. The opening of the intake valve is jointly controlled in combination with the current compensation opening and the closed-loop intake valve opening, thereby avoiding sudden fluctuations inside the fuel cell during exhaust and ensuring the stability of the flow and pressure of the gas entering the stack.

[0152] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. And the above-mentioned specific embodiments of the present application are described. Other embodiments are within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0153] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment and storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0154] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware, or may be accomplished by instructing the relevant hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0155] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A pressure control method for a fuel cell, characterized in that: The method comprises: If the valve state of the exhaust valve of the fuel cell is in the open state, obtain the outlet state information corresponding to the exhaust valve, the intake state information corresponding to the intake valve, the current compensation opening and the closed-loop intake valve opening, wherein the outlet state information includes the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature, the current compensation opening is determined based on the current stack current information of the fuel cell, and the closed-loop intake valve opening is determined based on the gas pressure information of the fuel cell; Inputting the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve inlet temperature into a preset flow calculation model to perform flow calculation to obtain the exhaust valve outlet flow rate; Determining the exhaust compensation opening corresponding to the intake valve based on the outlet air flow, the intake state information and the preset flow calculation model; The intake valve opening is controlled based on the current compensation opening, the closed-loop intake valve opening, and the exhaust compensation opening so that the pressure of the fuel cell maintains an initial pressure.

2. The method according to claim 1, characterized in that The method further comprises: Obtaining current stack current information of the fuel cell; The current compensation opening is determined based on the current stack current information and a preset current proportional valve opening relationship table, and the preset current proportional valve opening relationship table is used to characterize the mapping relationship between current and intake valve opening.

3. The method according to claim 1, characterized in that The method further comprises: Acquiring gas pressure information of the fuel cell, wherein the gas pressure information includes actual pressure and target pressure; Deviation processing is performed based on the actual pressure and the target pressure to obtain the closed-loop intake valve opening.

4. The method according to claim 1, characterized in that: The method further comprises: Construct the preset flow calculation model, the preset flow calculation model is as follows: in, is the gas flow rate, A e is the effective area, P in is the inlet pressure, P out is the outlet pressure, T in is the inlet temperature, R is the universal gas constant, and γ is the diatomic gas adiabatic index.

5. The method according to claim 4, characterized in that The determining of the exhaust compensation opening corresponding to the intake valve based on the outlet flow rate, the intake state information and the preset flow rate calculation model includes: Determine an effective area of ​​an intake valve corresponding to the intake valve based on the outlet flow rate, the intake state information and the preset flow rate calculation model; Obtaining a total intake valve area corresponding to the intake valve; The exhaust compensation opening corresponding to the intake valve is obtained by performing ratio processing based on the effective area of ​​the intake valve and the total area of ​​the intake valve.

6. The method according to claim 5, characterized in that The intake state information includes an intake valve inlet pressure, an intake valve outlet pressure, and an intake valve intake temperature. The determining of an intake valve effective area corresponding to the intake valve based on the outlet flow rate, the intake state information, and the preset flow rate calculation model includes: Transpose the preset flow calculation model to obtain an effective area calculation model; Using the outlet gas flow rate as the gas inlet flow rate corresponding to the inlet valve; The gas inlet flow rate, the intake valve inlet pressure, the intake valve outlet pressure and the intake valve intake temperature are input into the effective area calculation model to solve the formula and obtain the intake valve effective area.

7. The method according to claim 1, characterized in that The method further comprises: Detecting the valve state of the exhaust valve; If the valve state of the exhaust valve is a closed state, the opening of the intake valve is controlled based on the current compensation opening and the closed-loop intake valve opening.

8. A pressure control device for a fuel cell, characterized in that: The device comprises: An information acquisition module, for acquiring, if the valve state of the exhaust valve of the fuel cell is in an open state, outlet state information corresponding to the exhaust valve, intake state information corresponding to the intake valve, current compensation opening and closed-loop intake valve opening corresponding to the exhaust valve, the outlet state information including the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve intake temperature, the current compensation opening being determined based on the current stack current information of the fuel cell, and the closed-loop intake valve opening being determined based on the gas pressure information of the fuel cell; an outlet flow determination module, configured to input the exhaust valve effective area, the exhaust valve inlet pressure, the exhaust valve outlet pressure and the exhaust valve inlet temperature into a preset flow calculation model to perform flow calculation to obtain the outlet flow of the exhaust valve; an exhaust compensation opening determination module, configured to determine the exhaust compensation opening corresponding to the intake valve based on the outlet flow rate, the intake state information and the preset flow calculation model; An intake valve control module is used to control the opening of the intake valve based on the current compensation opening, the closed-loop intake valve opening and the exhaust compensation opening so that the pressure of the fuel cell maintains an initial pressure.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by a processor to implement the pressure control method of a fuel cell as described in any one of claims 1-7.

10. An electronic device, characterized in that: It includes at least one processor and a memory that is communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the at least one processor implements the fuel cell pressure control method as described in any one of claims 1 to 7 by executing the instructions stored in the memory.

Images