Fuel cell hydrogen supply system control method, fuel cell system, medium and equipment

Abstract

The present invention relates to the field of new energy technology, and in particular to a fuel cell hydrogen supply system control method, a fuel cell system, a medium and equipment; a proportional valve is provided at the front end of a hydrogen injector of the fuel cell hydrogen supply system; the control method comprises obtaining a pressure value of a fuel cell stack, calculating a target pressure value of an inlet of the hydrogen injector according to the pressure value; adjusting the proportional valve according to the target pressure value, and calculating a driving current of the hydrogen injector according to the pressure at the rear end of the proportional valve; the present invention uses the fuel cell hydrogen supply system control method, when the operating pressure of the fuel cell stack is low, the driving current of the hydrogen injector is low, the force applied to the nozzle becomes smaller, and the sound of the nozzle hitting the cavity is reduced accordingly, thereby achieving the purpose of reducing the noise of the hydrogen injector at low power.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a fuel cell hydrogen supply system control method, a fuel cell system, a medium and equipment. Background Art

[0002] With the increasing scarcity of natural resources such as oil and coal around the world, clean energy sources such as wind, nuclear, solar, and fuel cells are gaining increasing attention from governments worldwide. my country is a major coal producer and consumer, but also a weak source of oil and gas, requiring substantial annual oil and gas imports. The development of new energy industries is an inevitable result of energy restructuring reforms.

[0003] Furthermore, traditional powertrains release harmful gases like COx, NOx, and SOx, as well as pollutants like PM particles, resulting in low thermal efficiency and environmental pollution. Fuel cell vehicles, however, are becoming increasingly popular due to their high efficiency, zero pollution, and long driving range. The basic operating principle of a fuel cell is that hydrogen and oxygen undergo an electrochemical reaction in the presence of a catalyst, converting chemical energy into electrical energy. Air is supplied by an air compressor, while hydrogen comes from a hydrogen storage tank and enters the engine system through a pressure reducing device.

[0004] Pressure reducing devices are divided into mechanical pressure reducing devices and electronic pressure regulating devices. Generally, the hydrogen supply system of fuel cells uses a combination of mechanical and electronic pressure reducing devices. The hydrogen injector is a commonly used electronic pressure regulating device. It is a switch combination valve with the advantages of fast response and stable pressure regulation.

[0005] The mechanical pressure reducing valve is used in combination with the hydrogen injector device. The inlet pressure of the hydrogen injector device is adjusted by the mechanical pressure reducing valve. The pressure at the inlet end of the hydrogen injector is a fixed value. As the hydrogen flow rate increases, the inlet pressure of the hydrogen injector will drop slightly.

[0006] The hydrogen injector inlet maintains a constant high-pressure pressure, so a large driving force is always required to open the nozzle of the hydrogen injector. The large driving force causes a large impact sound during the opening process of the valve body. At low power, the working sound of other components is very small, which especially highlights the huge noise when the hydrogen injector is working, giving users a very bad experience. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a fuel cell hydrogen supply system control method that solves the noise problem caused by the operation of the hydrogen injector when the engine system is running at low power.

[0008] In order to solve the above technical problems, the first technical solution adopted by the present invention is:

[0009] A method for controlling a fuel cell hydrogen supply system, wherein a proportional valve is provided at the front end of a hydrogen injector of the fuel cell hydrogen supply system;

[0010] Obtain the pressure value of the fuel cell stack and calculate the target pressure value of the hydrogen injector inlet based on the pressure value;

[0011] The proportional valve is adjusted according to the target pressure value, and the driving current of the hydrogen injector is calculated according to the pressure at the rear end of the proportional valve.

[0012] Preferably, the calculating the target pressure value includes:

[0013] According to the corresponding relationship K1 between the pressure value P_sys of the fuel cell stack and the inlet pressure P_in of the hydrogen injector, the inlet target pressure value P_in currently required by the hydrogen injector is calculated;

[0014] The calculation method is: P_in=K1*P_sys.

[0015] Preferably, the proportional valve adjusts its opening in a closed loop according to the target pressure value, and controls the pressure at the rear end of the proportional valve to be maintained within a range of ±10% of the target pressure value.

[0016] Preferably, the calculating the driving current includes:

[0017] The driving current of the hydrogen injector is calculated based on the corresponding relationship K2 between the pressure P_act at the rear end of the proportional valve and the driving current of the hydrogen injector;

[0018] The calculation method is: I_drv=K2*P_act.

[0019] Preferably, the pressure value of the fuel cell stack is the fuel cell stack target pressure or the fuel cell stack operating pressure.

[0020] In order to solve the above technical problems, the second technical solution adopted by the present invention is:

[0021] A fuel cell system includes a controller, a fuel cell stack, and a hydrogen supply system, wherein the hydrogen supply system includes a proportional valve and a hydrogen injector, and the proportional valve is connected to the fuel cell stack through the hydrogen injector;

[0022] The controller obtains the pressure value of the fuel cell stack, calculates the target pressure value at the hydrogen injector inlet according to the pressure value; adjusts the proportional valve according to the target pressure value, and calculates the driving current of the hydrogen injector according to the pressure at the rear end of the proportional valve.

[0023] Preferably, a first pressure sensor is provided between the proportional valve and the hydrogen injector, and a second pressure sensor is provided between the hydrogen injector and the fuel cell stack;

[0024] The first pressure sensor and the second pressure sensor are electrically connected to the controller respectively.

[0025] Preferably, the controller adjusts the opening of the proportional valve in a closed loop according to the target pressure value, and controls the pressure at the rear end of the proportional valve to be maintained within the range of ±10% of the target pressure value.

[0026] In order to solve the above technical problems, the third technical solution adopted by the present invention is:

[0027] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned fuel cell hydrogen supply system control method.

[0028] In order to solve the above technical problems, the fourth technical solution adopted by the present invention is:

[0029] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the above-mentioned fuel cell hydrogen supply system control method is implemented.

[0030] The beneficial effect of the present invention is that: through the fuel cell hydrogen supply system control method, when the operating pressure of the fuel cell stack is low, the driving current of the hydrogen injector is low, the force applied to the nozzle becomes smaller, and the sound of the nozzle hitting the cavity becomes smaller, thereby achieving the purpose of reducing the noise of the hydrogen injector at low power. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic flow chart of a fuel cell hydrogen supply system control method according to a specific embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the partial composition of a fuel cell system according to a third embodiment of the present invention;

[0033] Explanation of reference numerals: 1. Proportional valve; 2. Hydrogen injector; 3. First pressure sensor; 4. Second pressure sensor; 5. Fuel cell stack. DETAILED DESCRIPTION

[0034] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0035] Example 1

[0036] A fuel cell hydrogen supply system control method, wherein a proportional valve is provided at the front end of a hydrogen injector 2 of the fuel cell hydrogen supply system, and the hydrogen injector is connected to a fuel cell stack;

[0037] Step 1: Obtain the corresponding relationship K1 between the stack target pressure P_sys and the hydrogen injector inlet pressure P_in, and calculate the current required inlet pressure of the hydrogen injector; P_in = K1 * P_sys; P_in is the target pressure adjusted by proportional valve 1;

[0038] Step 2: Adjust the opening of proportional valve 1 according to P_in closed loop so that the pressure P_act at the rear end of the proportional valve is maintained between the target value P_in ± 10%;

[0039] Step 3: Calculate the driving current of the hydrogen injector according to the corresponding relationship K2 between the pressure P_act at the rear end of the proportional valve and the driving current of the hydrogen injector, and the driving current of the hydrogen injector is I_drv=K2*P_act;

[0040] Repeat steps 1 to 3 to adjust the drive current under all operating conditions.

[0041] The corresponding relations K1 and K2 can be obtained by looking up the table.

[0042] Example 2

[0043] A method for controlling a fuel cell hydrogen supply system is provided. The similarities with the first embodiment are omitted for clarity, wherein the target pressure of the fuel cell stack is replaced by the current operating pressure of the fuel cell stack.

[0044] Example 3

[0045] Reference Figure 2 A fuel cell system includes a controller, a fuel cell stack 5 and a hydrogen supply system, wherein the hydrogen supply system includes a proportional valve 1 and a hydrogen injector 2, wherein the proportional valve 1 is connected to the fuel cell stack 5 through the hydrogen injector 2; a first pressure sensor 3 is provided between the proportional valve 1 and the hydrogen injector 2, and a second pressure sensor 4 is provided between the hydrogen injector 2 and the fuel cell stack 5; the first pressure sensor 3 and the second pressure sensor 4 are electrically connected to the controller respectively.

[0046] The controller obtains the corresponding relationship K1 between the target pressure P_sys of the fuel cell stack 5 and the inlet pressure P_in of the hydrogen injector 2, and calculates the inlet pressure currently required by the hydrogen injector 2; P_in = K1*P_sys; P_in is the target pressure adjusted by the proportional valve 1; P_sys is Figure 2 The second pressure sensor 4 in the acquisition is obtained;

[0047] According to P_in closed loop adjustment of the proportional valve 1 opening, the pressure P_act at the rear end of the proportional valve 1 is kept between the target value P_in±10%. P_act is determined by Figure 2 The first pressure sensor 3 in the acquisition is obtained;

[0048] The driving current of the hydrogen injector 2 is calculated according to the corresponding relationship K2 between the pressure P_act at the rear end of the proportional valve 1 and the driving current of the hydrogen injector 2, and the driving current of the hydrogen injector I_drv=K2*P_act;

[0049] The corresponding relations K1 and K2 can be obtained by looking up the table.

[0050] Example 4

[0051] A vehicle, characterized by comprising the fuel cell system described in embodiment three.

[0052] Example 5

[0053] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the fuel cell hydrogen supply system control method described in any one of Embodiment 1 or Embodiment 2.

[0054] Example 6

[0055] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the fuel cell hydrogen supply system control method described in any one of Embodiment 1 or Embodiment 2 is implemented.

[0056] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fuel cell hydrogen supply system control method, characterized in that: A proportional valve is provided at the front end of the hydrogen injector of the fuel cell hydrogen supply system; Obtain the pressure value of the fuel cell stack and calculate the target pressure value of the hydrogen injector inlet based on the pressure value; The proportional valve is adjusted according to the target pressure value, and the driving current of the hydrogen injector is calculated according to the pressure at the rear end of the proportional valve; The calculation of the target pressure value includes: According to the corresponding relationship K1 between the pressure value P_sys of the fuel cell stack and the inlet pressure P_in of the hydrogen injector, the inlet target pressure value P_in currently required by the hydrogen injector is calculated; The calculation method is: P_in = K1*P_sys; The proportional valve adjusts its opening in a closed loop according to the target pressure value, and controls the pressure at the rear end of the proportional valve to be maintained within the range of ±10% of the target pressure value; The calculating of the driving current includes: The driving current of the hydrogen injector is calculated based on the corresponding relationship K2 between the pressure P_act at the rear end of the proportional valve and the driving current of the hydrogen injector; The calculation method is: I_drv=K2*P_act.

2. The fuel cell hydrogen supply system control method according to claim 1, characterized in that: The pressure value of the fuel cell stack is the fuel cell stack target pressure or the fuel cell stack operating pressure.

3. A fuel cell system, characterized in that: The fuel cell system is based on the fuel cell hydrogen supply system control method of claim 1 or 2, comprising a controller, a fuel cell stack, and a hydrogen supply system, wherein the hydrogen supply system comprises a proportional valve and a hydrogen injector, wherein the proportional valve is connected to the fuel cell stack through the hydrogen injector; The controller obtains the pressure value of the fuel cell stack and calculates the target pressure value of the hydrogen injector inlet according to the pressure value; The proportional valve is adjusted according to the target pressure value, and the driving current of the hydrogen injector is calculated according to the pressure at the rear end of the proportional valve.

4. The fuel cell system according to claim 3, wherein: A first pressure sensor is provided between the proportional valve and the hydrogen injector, and a second pressure sensor is provided between the hydrogen injector and the fuel cell stack; The first pressure sensor and the second pressure sensor are electrically connected to the controller respectively.

5. The fuel cell system according to claim 4, characterized in that The controller adjusts the opening of the proportional valve in a closed loop according to the target pressure value, and controls the pressure at the rear end of the proportional valve to be maintained within the range of ±10% of the target pressure value.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the fuel cell hydrogen supply system control method according to any one of claims 1 to 2 is implemented.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the fuel cell hydrogen supply system control method according to any one of claims 1 to 2 is implemented.

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