Fuel cell hydrogen medium pressure control method, system and device

Abstract

The invention relates to the technical field of fuel cell control, and particularly provides a fuel cell hydrogen medium pressure control method, system and device.The method comprises the steps that a current hydrogen medium pressure fluctuation value of a hydrogen system in the hydrogen discharging process is obtained; and under the condition that the current hydrogen medium pressure fluctuation value does not meet the preset condition, the hydrogen supply hydrogen pressure in the hydrogen system is controlled. According to the fuel cell hydrogen medium-pressure control method, after the opening degree of the electric control pressure reducing valve is controlled by using the electric signal, three-valve linkage is carried out between the hydrogen discharging electromagnetic valve and the hydrogen inlet proportional valve based on the pressure reducing valve and the hydrogen system, so that the hydrogen system can adaptively control and reduce hydrogen medium-pressure fluctuation through the opening degree of the pressure reducing valve; therefore, the stable control of the medium pressure of the hydrogen in the hydrogen discharging process of the fuel cell is better realized.

Description

Technical Field

[0001] The present application relates to the field of fuel cell control technology, and in particular to a fuel cell hydrogen medium pressure control method, system and device. Background Art

[0002] At present, for the hydrogen intake and exhaust process of the proton exchange membrane fuel cell system, hydrogen is generally transported to the fuel cell stack through a hydrogen storage tank. When transporting hydrogen to the fuel cell stack, the high-pressure gas in the hydrogen storage tank must be reduced to a medium pressure, and then the pressure is adjusted by a proportional valve or a hydrogen injector to be provided to the fuel cell stack. Usually, a mechanical pressure reducing valve is used in this link to reduce the high-pressure gas in the hydrogen storage tank to a medium pressure.

[0003] The working principle of the existing mechanical pressure reducing valve is based on the elastic force of the mechanical spring adjusted by the bolt. When high-pressure gas reaches the piston port of the mechanical pressure reducing valve, if the pressure of the high-pressure gas is greater than the warning pressure, the high-pressure gas will push open the piston device of the mechanical pressure reducing valve and transport the high-pressure gas to the downstream; however, in the case of intermittent hydrogen discharge of the fuel cell, when the hydrogen discharge solenoid valve is opened, the gas flow rate flowing through the mechanical pressure reducing valve will suddenly increase. At this time, faced with the sudden change in gas flow, the mechanical spring cannot quickly respond to the pressure change at this time, resulting in a sudden decrease in the output medium pressure, which will cause unstable pressure at the front end of the proportional valve or the hydrogen injector, thereby generating hydrogen pressure fluctuations entering the fuel cell stack, causing the proton exchange membrane to suffer continuous mechanical fatigue damage, and ultimately causing an irreversible reduction in the life of the fuel cell stack. Summary of the invention

[0004] In response to the above problems, the present application provides a fuel cell hydrogen medium pressure control method, system and device, which solves the problem in the prior art that when the hydrogen exhaust solenoid valve is opened, the medium pressure of the hydrogen supply system is suddenly reduced, resulting in large fluctuations in the hydrogen pressure entering the fuel cell stack. The hydrogen system can reduce the fluctuation of the hydrogen medium pressure by adaptively controlling the opening of the pressure reducing valve, thereby better achieving stable control of the hydrogen medium pressure of the fuel cell during the hydrogen exhaust process.

[0005] To achieve the purpose of this application, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a fuel cell hydrogen medium pressure control method, comprising:

[0007] Obtain the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process;

[0008] When the current hydrogen medium pressure fluctuation value does not meet the preset condition, the hydrogen supply pressure in the hydrogen system is controlled.

[0009] In a possible implementation, the current hydrogen medium pressure fluctuation value is a hydrogen medium pressure fluctuation value between a first time point and a second time point after the time point of opening the hydrogen exhaust solenoid valve; obtaining the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen exhaust process includes: based on a medium pressure sensor located between the hydrogen inlet proportional valve and the pressure reducing valve, obtaining a first pressure value of the hydrogen system at the first time and a second pressure value of the hydrogen system at the second time; wherein the time interval between the first time and the second time is a real-time monitoring interval; and calculating the absolute value of the difference between the second pressure value and the first pressure value to obtain the current hydrogen medium pressure fluctuation value.

[0010] In a possible implementation, the method of obtaining the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process further includes: obtaining the pressure values ​​corresponding to multiple time points of the hydrogen system between the third time and the fourth time based on a medium pressure sensor located between the hydrogen inlet proportional valve and the pressure reducing valve; calculating the absolute value of the difference between the pressure value and the fluctuation threshold for the pressure value corresponding to each time point; and calculating the average value of multiple absolute values ​​to obtain the current hydrogen medium pressure fluctuation value.

[0011] In a possible implementation, the preset condition is a fluctuation threshold; when the current hydrogen medium pressure fluctuation value does not meet the preset condition, the hydrogen supply pressure in the hydrogen system is controlled, including: when the current hydrogen medium pressure fluctuation value is greater than or equal to the fluctuation threshold, increasing the opening of the pressure reducing valve to obtain a first pressure reducing valve opening; when the pressure reducing valve is at the first pressure reducing valve opening, measuring the first hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process, and comparing the first hydrogen medium pressure fluctuation value with the fluctuation threshold; wherein, the first hydrogen medium pressure fluctuation value is the hydrogen medium pressure fluctuation threshold in the next time period of the current hydrogen medium pressure fluctuation threshold; when the first hydrogen medium pressure fluctuation value is greater than or equal to the fluctuation threshold, increasing the opening of the pressure reducing valve again until the hydrogen medium pressure fluctuation value is less than the preset threshold.

[0012] In a possible implementation, the method further includes: storing the first pressure reducing valve opening and the first hydrogen medium pressure fluctuation value; and in each subsequent hydrogen discharge process, determining the target opening of the pressure reducing valve based on the first pressure reducing valve opening and the first hydrogen medium pressure fluctuation value.

[0013] In a possible implementation, the method further includes: when the hydrogen medium pressure fluctuation value satisfies a preset condition, maintaining the opening of the pressure reducing valve unchanged.

[0014] In a second aspect, the present application provides a fuel cell hydrogen medium pressure control system, which is used to implement the above-mentioned fuel cell hydrogen medium pressure control method, including a controller, a pressure reducing valve control subsystem, a proportional valve control subsystem, and a hydrogen exhaust valve control subsystem;

[0015] The controller is used for obtaining a current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process when the hydrogen discharge valve control subsystem controls to open the hydrogen discharge solenoid valve and the proportional valve control subsystem controls to increase the hydrogen inlet proportional valve during the hydrogen discharge process, and controlling the hydrogen supply pressure in the hydrogen system based on the pressure reducing valve control subsystem when the current hydrogen medium pressure fluctuation value does not meet a preset condition;

[0016] The pressure reducing valve control subsystem is used to monitor the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process, and control the pressure reducing valve based on the current hydrogen medium pressure fluctuation value;

[0017] The proportional valve control subsystem is used to monitor the stack pressure during the hydrogen discharge process and control the hydrogen inlet proportional valve according to the stack pressure;

[0018] The hydrogen exhaust valve control subsystem is used to control the hydrogen exhaust solenoid valve.

[0019] In a third aspect, the present application provides a fuel cell hydrogen medium pressure control device, comprising:

[0020] An acquisition module is used to acquire the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process;

[0021] The control module is used to control the hydrogen supply pressure in the hydrogen system when the current hydrogen medium pressure fluctuation value does not meet the preset conditions.

[0022] In a possible implementation, the control module includes a pressure reducing valve control submodule and a monitoring submodule; the pressure reducing valve control submodule is used to increase the opening of the pressure reducing valve to obtain a first pressure reducing valve opening when the current hydrogen medium pressure fluctuation value is greater than or equal to the fluctuation threshold; the monitoring submodule is used to measure the first hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process when the pressure reducing valve is at the first pressure reducing valve opening, and compare the first hydrogen medium pressure fluctuation value with the fluctuation threshold; wherein the first hydrogen medium pressure fluctuation value is the hydrogen medium pressure fluctuation threshold in the next time period of the current hydrogen medium pressure fluctuation threshold; the pressure reducing valve control submodule is also used to increase the opening of the pressure reducing valve again when the first hydrogen medium pressure fluctuation value is greater than or equal to the fluctuation threshold until the hydrogen medium pressure fluctuation value is less than the preset threshold.

[0023] In a fourth aspect, the present application provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the fuel cell hydrogen medium pressure control method as described above when executing the computer program.

[0024] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the fuel cell hydrogen medium pressure control method as described above are implemented.

[0025] The fuel cell hydrogen medium pressure control method, system and device provided in the present application obtain the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process, and control the hydrogen supply pressure in the hydrogen system when the current hydrogen medium pressure fluctuation value does not meet the preset conditions. The fuel cell hydrogen medium pressure control method of the present application uses an electrical signal to control the opening of the pressure reducing valve, and then performs a three-valve linkage between the pressure reducing valve and the hydrogen discharge solenoid valve and the hydrogen inlet proportional valve of the hydrogen system, so that the hydrogen system can reduce the hydrogen medium pressure fluctuation through the pressure reducing valve opening adaptive control, thereby better realizing the stable control of the hydrogen medium pressure of the fuel cell during the hydrogen discharge process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present application and form a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0027] Figure 1 An optional flow chart of a fuel cell hydrogen medium pressure control method provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of a system architecture of a hydrogen system provided in an embodiment of the present application;

[0029] Figure 3 An optional flow chart of a fuel cell hydrogen medium pressure control method provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the medium pressure control effect in the existing hydrogen supply application scenario provided by the embodiment of the present application;

[0031] Figure 5 A schematic diagram of the medium-pressure control effect of the fuel cell hydrogen medium-pressure control method provided in an embodiment of the present application in an application scenario;

[0032] Figure 6 A schematic diagram of the structure of a fuel cell hydrogen medium pressure control device provided in an embodiment of the present application;

[0033] Figure 7A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0036] The proton exchange membrane (PEM) hydrogen fuel cell system is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. Its basic principle is that hydrogen is decomposed into protons and electrons through the action of a catalyst, wherein protons react with oxygen through the proton exchange membrane to generate water, while electrons flow from the positive electrode to the negative electrode through an external circuit to output electrical energy. The hydrogen supply system of the PEM hydrogen fuel cell system is used to provide clean hydrogen with appropriate flow, temperature, pressure and humidity for the battery stack. Its stable hydrogen supply capacity can ensure that the penetration and reaction process of hydrogen in the proton exchange membrane is more uniform and controllable, reduce the probability of system failure, and enable the battery to respond quickly and provide stable output power under different workload conditions.

[0037] The hydrogen supply of the PEM hydrogen fuel cell system is generally to deliver hydrogen to the stack through a hydrogen storage tank. In order to store more hydrogen, most of the hydrogen storage tanks use high pressure (35Mpa / 70Mpa) to increase the hydrogen density. When delivering hydrogen to the stack, the high-pressure gas must be reduced to a medium pressure of 1-2Mpa, and then the proportional valve or hydrogen injector adjusts the pressure to provide it to the stack. In this process, a mechanical pressure reducing valve is usually used to reduce the high-pressure gas in the hydrogen storage tank to medium pressure. However, in the case of intermittent hydrogen discharge of the fuel cell, when the hydrogen discharge solenoid valve is opened, the gas flow through the mechanical pressure reducing valve will suddenly increase. At this time, the insufficient spring response of the mechanical pressure reducing valve will cause a sudden decrease in the medium pressure, which will cause the pressure at the front end of the proportional valve or hydrogen injector to be unstable, resulting in pressure fluctuations entering the stack, causing the proton exchange membrane to be damaged by continuous mechanical fatigue, and ultimately causing the irreversible reduction of the life of the stack. At the same time, the pressure fluctuation at the rear end of the mechanical pressure reducing valve will also cause mechanical stress fluctuations in the internal adjustment spring, thereby affecting the service life of the mechanical pressure reducing valve.

[0038] In order to solve the above technical problems, the present invention proposes the following technical solutions and corresponding embodiments.

[0039] Example 1

[0040] Combine the following Figures 1 to 7 The embodiments shown describe the technical solution of the present invention:

[0041] Figure 1 FIG. 1 is a flow chart of a method for controlling the medium pressure of hydrogen gas in a fuel cell according to an embodiment of the present application. It should be noted that the method for controlling the medium pressure of hydrogen gas in a fuel cell according to an embodiment of the present application can be applied to a hydrogen fuel cell system, such as Figure 1 As shown, a fuel cell hydrogen medium pressure control method according to an embodiment of the present application includes the following steps S101 to S102:

[0042] Step S101, obtaining the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process.

[0043] In the embodiment of the present application, the hydrogen system corresponds to the hydrogen supply system in the embodiment of the present application. The current hydrogen medium pressure fluctuation value can be understood as the pressure change value of the hydrogen system during the hydrogen discharge process. Here, the pressure change value can be the change difference of the hydrogen pressure of the most recent interval measured in real time when the hydrogen system is in the hydrogen discharge process. The most recent interval can be the minimum unit interval of the real-time monitoring system.

[0044] In the embodiment of the present application, the hydrogen pressure measured in real time when the hydrogen system is in the process of hydrogen discharge can be detected in real time by setting a medium-pressure pressure sensor at the exhaust port of the pressure reducing valve through the medium-pressure pressure sensor. When the hydrogen fuel cell system is operating normally and in the process of hydrogen discharge, the discharge of hydrogen will cause the pressure on the hydrogen side to drop. However, the mechanical strength of the membrane electrode in the stack is relatively low. In order to avoid damage to the proton membrane, it is necessary to ensure that the pressure on the hydrogen side is equal to or slightly higher than the pressure on the air side, and when adjusting the pressure on both sides, it is necessary to try to keep the same rise and fall; in the process of hydrogen discharge, if pressure compensation is not performed, the low pressure on the hydrogen side will cause the proton exchange membrane to be subjected to additional stress, affecting the power generation efficiency and service life of the battery.

[0045] It should be noted here that in order to ensure the stability of the hydrogen pressure entering the stack, a stack pressure sensor is set at the output port of the hydrogen supply unit of the hydrogen system (i.e., the hydrogen inlet of the fuel cell stack). Here, the stack pressure sensor is used to monitor the hydrogen pressure entering the stack in real time.

[0046] In an embodiment of the present application, the pressure reducing valve control unit receives the current hydrogen medium pressure fluctuation value monitored by the medium pressure sensor in real time. The current hydrogen medium pressure fluctuation value may be the difference between the hydrogen pressure values ​​at any two adjacent time points during the hydrogen discharge period. Exemplarily, the current hydrogen medium pressure fluctuation value may be the pressure difference in the time period from 10ms to 20ms in real time after the hydrogen discharge solenoid valve is opened (i.e., the difference between the pressure value at 10ms and the pressure value at 20ms).

[0047] In the embodiment of the present application, the current hydrogen medium pressure fluctuation value may also be based on the hydrogen pressure measured in real time when the hydrogen system is in the process of hydrogen discharge, and the pressure reducing valve control unit takes the hydrogen pressure value and calculates the change difference according to the preset time interval; illustratively, the current hydrogen medium pressure fluctuation value is the pressure difference in the time period from 10ms to 40ms after the hydrogen discharge solenoid valve is opened (i.e., the difference between the pressure value at 10ms and the pressure value at 40ms). In the embodiment of the present application, the current hydrogen medium pressure fluctuation value may also be the hydrogen pressure difference measured at preset fixed time intervals when the hydrogen system is in the process of hydrogen discharge, that is, if the pressure value is measured only at 10ms and 40ms.

[0048] In the embodiments of the present application, Figure 2 As shown, the architecture of the fuel cell hydrogen system includes: a hydrogen storage bottle; an electronically controlled pressure reducing valve, whose air inlet is connected to the hydrogen storage device; a hydrogen inlet proportional valve, which is connected to the exhaust port of the electronically controlled pressure reducing valve; an ejector, which is connected to the exhaust port of the hydrogen inlet proportional valve; a fuel cell stack, which is connected to the output port of the ejector and is used to generate and output voltage; a gas-liquid separator, which is connected to the output port of the fuel cell stack; a hydrogen exhaust solenoid valve, which is connected to the output port of the gas-liquid separator, and multi-way exhaust can be performed when the hydrogen exhaust solenoid valve is opened.

[0049] When the PEM hydrogen fuel cell system needs to discharge hydrogen and water, the hydrogen discharge solenoid valve is opened. At this time, the gas pressure in the stack will drop rapidly. Therefore, based on the opening value of the original hydrogen inlet proportional valve, it is necessary to increase the opening of the hydrogen inlet proportional valve (i.e., the cross-sectional area of ​​the hydrogen inlet proportional valve) to achieve feedforward supplementation to supplement the gas pressure loss caused by opening the hydrogen discharge solenoid valve. This process will cause an instantaneous increase in gas flow, resulting in a decrease in the medium pressure at the exhaust port of the pressure reducing valve. In a possible implementation, the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process is obtained, which means: after opening the hydrogen discharge solenoid valve and controlling the increase in the opening of the hydrogen inlet proportional valve, the medium pressure sensor arranged at the exhaust port of the pressure reducing valve is used to monitor and calculate the hydrogen pressure change value at the exhaust port of the pressure reducing valve, and obtain the change record value of the hydrogen medium pressure, which is used to adjust the opening of the pressure reducing valve based on the original opening of the pressure reducing valve.

[0050] As an example, the pressure reducing valve control unit may detect and record in real time the pressure change value of the medium pressure sensor in each hydrogen discharge situation starting from the first opening of the hydrogen discharge solenoid valve.

[0051] Step S102: When the current hydrogen medium pressure fluctuation value does not meet a preset condition, the hydrogen supply pressure in the hydrogen system is controlled.

[0052] In an embodiment of the present application, the current hydrogen medium pressure fluctuation value obtained in step S101 is judged to obtain a judgment result for the hydrogen supply hydrogen pressure, and based on the judgment result, the opening of the pressure reducing valve is adjusted accordingly to reduce the first hydrogen medium pressure fluctuation value of the hydrogen supply system, wherein the first hydrogen medium pressure fluctuation value can be understood as the real-time monitoring value of the next time period immediately adjacent to the previous time period (corresponding to the time period for monitoring the current hydrogen medium pressure fluctuation value in the embodiment of the present application) during the hydrogen discharge process, and this interval time point can be 10ms. In an embodiment of the present application, the pressure reducing valve can be an electrically controlled pressure reducing valve, which is controlled by the pressure reducing valve control unit through an electrical connection. In an embodiment of the present application, when the judgment result is that the current hydrogen medium pressure fluctuation value does not meet the preset conditions, the hydrogen supply hydrogen pressure in the hydrogen system is controlled.

[0053] In the embodiment of the present application, the preset condition may be a preset fluctuation threshold. Each time the hydrogen supply pressure of the hydrogen system is controlled, when the current hydrogen medium pressure fluctuation value is greater than or equal to the fluctuation threshold, the opening is increased on the basis of the original opening of the electronically controlled pressure reducing valve to increase the duty cycle of the electronically controlled pressure reducing valve until the first pressure reducing valve opening is reached, wherein the first pressure reducing valve opening may be a preset first gradient opening, whereby, when the electronically controlled pressure reducing valve is at the first pressure reducing valve opening, the first hydrogen medium pressure fluctuation value of the hydrogen supply system during the hydrogen discharge process is measured, and the first hydrogen medium pressure fluctuation value is compared with the preset fluctuation threshold to obtain a comparison result; when the comparison result is that the first hydrogen medium pressure fluctuation value is greater than or equal to the preset fluctuation threshold, the opening of the electronically controlled pressure reducing valve is increased again to the second pressure reducing valve opening, and the second pressure reducing valve opening may be a preset second gradient opening, wherein the second gradient opening is greater than the first gradient opening. When the current hydrogen medium pressure fluctuation value is less than the fluctuation threshold, it indicates that the hydrogen supply pressure of the current hydrogen system is within a reasonable range, and the opening of the electronically controlled pressure reducing valve remains unchanged. As a feasible implementation, when the medium pressure during the hydrogen discharge process is 1.5 MPa, the fluctuation threshold can be set to 50 kPa, and correspondingly, the opening of the pressure reducing valve can be adjusted step by step according to a gradient of 1% of its diameter cross-sectional area.

[0054] In an embodiment of the present application, when the current hydrogen medium pressure fluctuation value is a change difference obtained by taking hydrogen pressure values ​​at preset time intervals and calculating the change difference by the pressure reducing valve control unit, when the first hydrogen medium pressure fluctuation value of the hydrogen supply system during the hydrogen discharge process needs to be measured again, the hydrogen pressure values ​​can still be taken at preset time intervals and the change difference can be calculated.

[0055] In an embodiment of the present application, each time the current hydrogen medium pressure fluctuation value is reduced by adjusting the opening of the electronically controlled pressure reducing valve, the hydrogen pressure value, the hydrogen medium pressure fluctuation value, and the opening adjustment value of the electronically controlled pressure reducing valve for the current hydrogen medium pressure fluctuation value obtained during the hydrogen discharge process can be stored to obtain multiple historical hydrogen pressure values, multiple historical hydrogen medium pressure fluctuation values ​​based on the hydrogen pressure value, and multiple historical electronically controlled pressure reducing valve opening adjustment values ​​for the historical hydrogen medium pressure fluctuation values. In an embodiment of the present application, the pressure reducing valve control unit can directly adjust the opening of the electronically controlled pressure reducing valve to the target opening value based on the current hydrogen medium pressure fluctuation value each time the opening of the electronically controlled pressure reducing valve is adjusted in the later period. Here, the target opening value is based on the target hydrogen medium pressure fluctuation value corresponding to the current hydrogen medium pressure fluctuation value from multiple historical hydrogen medium pressure fluctuation values, and the electronically controlled pressure reducing valve opening value that is finally adjusted to reach. Here, in the case where there is a lack of a fluctuation value that is completely equal to the current hydrogen medium pressure fluctuation value in multiple historical hydrogen medium pressure fluctuation values, the fluctuation value adjacent to the current hydrogen medium pressure fluctuation value can be referred to. As a feasible implementation method, the target opening value may also be the optimal opening value determined after the pressure reducing valve control unit performs self-learning on multiple historical hydrogen pressure values, historical hydrogen medium pressure fluctuation values, and historical electronically controlled pressure reducing valve opening adjustment values.

[0056] Through the fuel cell hydrogen medium pressure control method, system and device provided by the present application, the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process is obtained, and when the current hydrogen medium pressure fluctuation value does not meet the preset conditions, the hydrogen supply hydrogen pressure in the hydrogen system is controlled. After the fuel cell hydrogen medium pressure control method of the present application uses an electrical signal to control the opening of the pressure reducing valve, a three-valve linkage is performed between the pressure reducing valve and the hydrogen discharge solenoid valve and the hydrogen inlet proportional valve of the hydrogen system, so that the hydrogen system can reduce the hydrogen medium pressure fluctuation through the pressure reducing valve opening adaptive control, thereby better realizing the stable control of the hydrogen medium pressure of the fuel cell during the hydrogen discharge process.

[0057] Example 2

[0058] Based on the above embodiment, this embodiment also provides a fuel cell hydrogen medium pressure control method, Figure 3 An optional flow chart of the fuel cell hydrogen medium pressure control method provided in this embodiment is as follows: Figure 3 As shown, the method of this embodiment includes the following steps S301 to S303 including the following contents:

[0059] Step S301: Based on the medium pressure sensor located between the hydrogen inlet proportional valve and the pressure reducing valve, obtain the pressure values ​​of the hydrogen system corresponding to multiple time points between the third time and the fourth time.

[0060] In the embodiment of the present application, the third time and the fourth time are separated by at least two minimum unit intervals of the real-time monitoring system. For example, the third time and the fourth time may be the 10th ms and the 40th ms after the hydrogen exhaust solenoid valve is opened, respectively, which may include 3 minimum unit intervals.

[0061] Step S302: For the pressure value corresponding to each time point, calculate the absolute value of the difference between the pressure value and the fluctuation threshold.

[0062] In the embodiment of the present application, the absolute value of the difference between each minimum unit interval and the fluctuation threshold is calculated.

[0063] Step S303: Calculate the average value of the multiple absolute values ​​to obtain the current hydrogen medium pressure fluctuation value.

[0064] In the embodiment of the present application, by regularly monitoring the hydrogen medium pressure fluctuation value, waste of monitoring resources during system operation is avoided.

[0065] Example 3

[0066] Based on the above embodiments, the present application embodiment tests the application effect of the fuel cell hydrogen medium pressure control method using the above embodiments. Figure 2 After setting up the PEM hydrogen fuel cell system, start the PEM hydrogen fuel cell system. After the system has been running stably for a period of time, first test the mechanical pressure reducing valve. The white line is the intermittent opening of the hydrogen exhaust valve, the red line is the fluctuation of the hydrogen medium pressure, and the yellow line is the control signal of the electronically controlled pressure reducing valve. Figure 4 As shown, since a mechanical pressure reducing valve is used now, the control signal of the electric pressure reducing valve is invalid at this time. According to the data in the figure, it can be concluded that the minimum medium pressure is 1396kpaA and the maximum is 1451kpaA, with a pressure fluctuation of nearly 50kpa.

[0067] Similarly, after the above test, the mechanical pressure reducing valve is replaced with an electronically controlled pressure reducing valve, and the PEM hydrogen fuel cell system is turned on. After the system has been running stably for a period of time, the electronically controlled pressure reducing valve is turned on. Figure 4 As shown in the figure, according to the data in the figure, the minimum medium pressure is 1356kpaA, the maximum is 1375kpaA, and the pressure fluctuation is 19kpa. The use of the electronically controlled pressure reducing valve significantly reduces the medium pressure fluctuation value.

[0068] The present invention also provides a fuel cell hydrogen medium pressure control system, which is used to implement the above fuel cell hydrogen medium pressure control method, including a controller, a pressure reducing valve control subsystem, a proportional valve control subsystem, and a hydrogen exhaust valve control subsystem;

[0069] The controller is used for obtaining a current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process when the hydrogen discharge valve control subsystem controls to open the hydrogen discharge solenoid valve and the proportional valve control subsystem controls to increase the hydrogen inlet proportional valve during the hydrogen discharge process, and controlling the hydrogen supply pressure in the hydrogen system based on the pressure reducing valve control subsystem when the current hydrogen medium pressure fluctuation value does not meet a preset condition;

[0070] The pressure reducing valve control subsystem is used to monitor the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process, and control the pressure reducing valve based on the current hydrogen medium pressure fluctuation value;

[0071] The proportional valve control subsystem is used to monitor the stack pressure during the hydrogen discharge process and control the hydrogen inlet proportional valve according to the stack pressure;

[0072] The hydrogen exhaust valve control subsystem is used to control the hydrogen exhaust solenoid valve.

[0073] The present invention further provides a fuel cell hydrogen medium pressure control device 600, which can be used to execute the fuel cell hydrogen medium pressure control method of any of the above embodiments of the present invention. Figure 6 The schematic diagram of the structure of the fuel cell hydrogen medium pressure control device 600 provided in the embodiment of the present application includes an acquisition module 601 and a control module 602:

[0074] An acquisition module 601 is used to acquire a current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process;

[0075] The control module 602 is used to control the hydrogen supply pressure in the hydrogen system when the current hydrogen medium pressure fluctuation value does not meet the preset conditions.

[0076] An embodiment of the present application also provides a vehicle, wherein the vehicle-mounted embedded controller is used to execute the steps in any of the above-mentioned fuel cell hydrogen medium pressure control method embodiments.

[0077] The present application also provides an electronic device, such as Figure 7As shown, the electronic device 700 can be a server, and the electronic device 700 includes a processor 701, a memory, a network interface 703 and a database 70213 connected through a system bus 704. Among them, the processor 701 is used to provide computing and control capabilities; the memory includes a non-volatile storage medium 7021 and an internal memory 7022, wherein the non-volatile storage medium 7021 stores an operating system 70211, a computer program 70212 and a database 70213, and the internal memory 7022 provides an environment for the operation of the operating system 70211 and the computer program 70212 in the non-volatile storage medium; the database 70213 is used to provide data such as the operating program of each system node; the network interface 703 is used to communicate with an external terminal through a network connection; when the computer program is executed by the processor 701, the fuel cell hydrogen medium pressure control method described in any of the above embodiments is implemented.

[0078] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the fuel cell hydrogen medium pressure control method in any embodiment of the present application is implemented. Specifically, a system or device equipped with a storage medium can be provided, on which a software program code that implements the functions of any of the above embodiments is stored, and a computer (or CPU or MPU) of the system or device reads and executes the program code stored in the storage medium.

[0079] In particular, according to an embodiment of the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable storage medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication part, and / or installed from a removable medium. When the computer program is executed by a central processing unit (CPU), the above-mentioned functions defined in the system of the present application are executed.

[0080] It should be noted that the computer-readable storage medium shown in the present invention can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present invention, a computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal can take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium may also be any computer-readable storage medium other than a computer-readable storage medium that can send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0081] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0082] The units involved in the embodiments of the present invention may be implemented by software or hardware, and the units described may also be arranged in a processor. The names of these units do not, in some cases, limit the units themselves.

[0083] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to an embodiment of the present invention, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0084] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the implementation of the present invention.

[0085] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

[0086] In the several embodiments provided in the present application, it should be understood that the disclosed systems, modules and methods can be implemented in other ways. For example, the module embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, modules or units, which can be electrical, mechanical or other forms.

[0087] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A fuel cell hydrogen medium pressure control method, characterized in that: include: Obtain the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process; When the current hydrogen medium pressure fluctuation value does not meet the preset condition, the hydrogen supply pressure in the hydrogen system is controlled.

2. The fuel cell hydrogen medium pressure control method according to claim 1, characterized in that: The current hydrogen medium pressure fluctuation value is a hydrogen medium pressure fluctuation value between a first time point and a second time point after the hydrogen discharge solenoid valve is opened; the obtaining of the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process includes: Based on a medium-pressure sensor located between the hydrogen inlet proportional valve and the pressure reducing valve, a first pressure value of the hydrogen system at the first time and a second pressure value of the hydrogen system at the second time are obtained; wherein the time interval between the first time and the second time is a real-time monitoring interval; The absolute value of the difference between the second pressure value and the first pressure value is calculated to obtain the current hydrogen medium pressure fluctuation value.

3. The fuel cell hydrogen medium pressure control method according to claim 2, characterized in that: The obtaining of the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process also includes: Based on a medium pressure sensor located between the hydrogen inlet proportional valve and the pressure reducing valve, obtaining pressure values ​​of the hydrogen system corresponding to a plurality of time points between a third time and a fourth time; For the pressure value corresponding to each time point, calculating the absolute value of the difference between the pressure value and the fluctuation threshold; The average value of the multiple absolute values ​​is calculated to obtain the current hydrogen medium pressure fluctuation value.

4. The fuel cell hydrogen medium pressure control method according to claim 2, characterized in that: The preset condition is a fluctuation threshold; when the current hydrogen medium pressure fluctuation value does not meet the preset condition, the hydrogen supply pressure in the hydrogen system is controlled, including: When the current hydrogen medium pressure fluctuation value is greater than or equal to the fluctuation threshold, increasing the opening of the pressure reducing valve to obtain a first pressure reducing valve opening; When the pressure reducing valve is at the first pressure reducing valve opening, measuring a first hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process, and comparing the first hydrogen medium pressure fluctuation value with the fluctuation threshold; wherein the first hydrogen medium pressure fluctuation value is a hydrogen medium pressure fluctuation threshold in a time period next to the current hydrogen medium pressure fluctuation threshold; When the first hydrogen medium pressure fluctuation value is greater than or equal to the fluctuation threshold, the opening of the pressure reducing valve is increased again until the hydrogen medium pressure fluctuation value is less than the preset threshold.

5. The fuel cell hydrogen medium pressure control method according to claim 4, characterized in that: The method further comprises: storing the first pressure reducing valve opening and the first hydrogen medium pressure fluctuation value; In each subsequent hydrogen discharge process, the target opening of the pressure reducing valve is determined based on the first pressure reducing valve opening and the first hydrogen intermediate pressure fluctuation value.

6. A fuel cell hydrogen medium pressure control system, used to implement the fuel cell hydrogen medium pressure control method according to any one of claims 1 to 5, characterized in that: Including controller, pressure reducing valve control subsystem, proportional valve control subsystem, hydrogen exhaust valve control subsystem; The controller is used for obtaining a current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process when the hydrogen discharge valve control subsystem controls to open the hydrogen discharge solenoid valve and the proportional valve control subsystem controls to increase the hydrogen inlet proportional valve during the hydrogen discharge process, and controlling the hydrogen supply pressure in the hydrogen system based on the pressure reducing valve control subsystem when the current hydrogen medium pressure fluctuation value does not meet a preset condition; The pressure reducing valve control subsystem is used to monitor the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process, and control the pressure reducing valve based on the current hydrogen medium pressure fluctuation value; The proportional valve control subsystem is used to monitor the stack pressure during the hydrogen discharge process and control the hydrogen inlet proportional valve according to the stack pressure; The hydrogen exhaust valve control subsystem is used to control the hydrogen exhaust solenoid valve.

7. A fuel cell hydrogen medium pressure control device, characterized in that: include: An acquisition module is used to acquire the current hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process; The control module is used to control the hydrogen supply pressure in the hydrogen system when the current hydrogen medium pressure fluctuation value does not meet the preset conditions.

8. The fuel cell hydrogen medium pressure control device according to claim 7, characterized in that: The control module includes a pressure reducing valve control submodule and a monitoring submodule; The pressure reducing valve control submodule is used to increase the opening of the pressure reducing valve to obtain a first pressure reducing valve opening when the current hydrogen medium pressure fluctuation value is greater than or equal to the fluctuation threshold; The monitoring submodule is used to measure a first hydrogen medium pressure fluctuation value of the hydrogen system during the hydrogen discharge process when the pressure reducing valve is at the first pressure reducing valve opening, and compare the first hydrogen medium pressure fluctuation value with the fluctuation threshold; wherein the first hydrogen medium pressure fluctuation value is a hydrogen medium pressure fluctuation threshold in a time period next to the current hydrogen medium pressure fluctuation threshold; The pressure reducing valve control submodule is further used to increase the opening of the pressure reducing valve again when the first hydrogen medium pressure fluctuation value is greater than or equal to the fluctuation threshold value, until the hydrogen medium pressure fluctuation value is less than the preset threshold value.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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