Shutdown purge control method, device, vehicle and medium

Abstract

The present application relates to the field of fuel cell technology, and in particular to a shutdown purge control method, device, vehicle and medium, wherein the method comprises: identifying the actual duration between the current moment and the moment when the vehicle starts to shut down; if the actual shutdown duration is less than the first preset duration, then executing the first shutdown purge action; if the actual shutdown duration is greater than or equal to the second preset duration, then executing the second shutdown purge action, wherein the second preset duration is greater than the first preset duration, and the purge duration of the second shutdown purge action is greater than the purge duration of the first shutdown purge action. Thus, the problems in the prior art that the risk of icing cannot be avoided, the energy consumption is high, the time consumption is long, and the energy waste caused by restarting in a short time are solved.

Description

Technical Field

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

[0002] When existing fuel cells are shut down in low-temperature environments, long-term, high-flow purge technology is generally used. The core of this method is to use high-flow purges of hydrogen and air to remove moisture from the stack to prevent moisture from freezing under low-temperature conditions, thereby damaging the internal structure of the fuel cell, affecting its performance and even causing safety risks.

[0003] However, since the operating temperature of the fuel cell is usually high before shutdown, as the temperature gradually decreases after shutdown, condensed water may still appear inside the stack, which means that relying solely on long-term high-flow purge cannot completely avoid the risk of icing. Secondly, this purge method is time-consuming and energy-intensive, which has an adverse effect on energy efficiency. Especially if the fuel cell needs to be restarted within a short period of time after shutdown, the previous high-flow purge is particularly wasteful because it consumes a lot of time and energy, but does not bring direct benefits to the upcoming startup operation. Summary of the invention

[0004] The present application provides a shutdown purge control method, device, vehicle and medium to solve the problems in the prior art of unavoidable icing risk, high energy consumption, long time consumption and energy waste caused by restarting in a short time.

[0005] The first aspect of the present application provides a shutdown purge control method, comprising the following steps: identifying the actual shutdown time between the current moment and the moment when the vehicle starts to shut down; if the actual shutdown time is less than a first preset time, executing a first shutdown purge action; if the actual shutdown time is greater than or equal to a second preset time, executing a second shutdown purge action, wherein the second preset time is greater than the first preset time, and the purge time of the second shutdown purge action is greater than the purge time of the first shutdown purge action.

[0006] Optionally, executing the first shutdown purge action includes operating the battery at minimum power, opening the first stop valve, the second stop valve and the dehumidification bypass valve, closing the exhaust bypass valve, keeping the hydrogen subsystem valve assembly in operation, setting the pressure valve to a preset opening, and setting the first air compressor speed and the target temperature of the cooling system.

[0007] Optionally, a second shutdown purge action is performed, including: obtaining the battery stack temperature and the ambient temperature; if the battery stack temperature is lower than the preset battery stack temperature, and the ambient temperature is lower than the preset ambient temperature, then opening the dehumidification bypass valve, the first stop valve, the second stop valve and the back pressure valve, closing the exhaust bypass valve, and setting the second air compressor speed.

[0008] Optionally, after opening the dehumidification bypass valve, the first stop valve, the second stop valve and the back pressure valve, closing the exhaust bypass valve and setting the speed of the second air compressor, it includes: obtaining the purge time; if the purge time is greater than the third preset time, closing the air compressor, the dehumidification bypass valve, the first stop valve, the second stop valve and the back pressure valve.

[0009] Optionally, the method further includes: if the actual shutdown time is greater than or equal to the first preset time and less than the second preset time, executing the shutdown action.

[0010] Optionally, a shutdown action is performed, including: obtaining a battery voltage; if the battery voltage is less than a preset voltage, closing the first shut-off valve, the hydrogen exhaust valve, the drain valve, the air compressor and the cooling system, and setting the hydrogen pressure to a preset pressure and the output current to a preset current.

[0011] Optionally, after closing the first shut-off valve, hydrogen discharge valve, water drain valve, air compressor and cooling system, and setting the hydrogen pressure and output current, the process includes: obtaining the speed of the third air compressor; if the speed of the third air compressor is less than the preset speed, closing the hydrogen shut-off valve, hydrogen injection valve and exhaust bypass valve.

[0012] The second aspect of the present application provides a shutdown purge control device, including: an acquisition module, used to identify the actual shutdown time between the current time and the time when the vehicle starts to shut down; a first execution module, used to execute a first shutdown purge action if the actual shutdown time is less than a first preset time; a second execution module, used to execute a second shutdown purge action if the actual shutdown time is greater than or equal to a second preset time, wherein the second preset time is greater than the first preset time, and the purge time of the second shutdown purge action is greater than the purge time of the first shutdown purge action.

[0013] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a shutdown purge control method as described in the above embodiment.

[0014] A fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the shutdown purge control method as described in the above embodiment.

[0015] Therefore, this application includes the following beneficial effects:

[0016] The embodiment of the present application can effectively prevent the corrosion of internal parts of the vehicle due to dust accumulation, water vapor and other factors during the downtime by performing different purge actions at different downtime durations, ensuring that the best cleaning effect can be achieved at any downtime duration; adjusting the intensity and duration of the purge action according to the downtime duration can avoid unnecessary energy consumption, achieve energy conservation and emission reduction, and improve user experience. Therefore, the technical problems in the prior art such as the inability to avoid the risk of icing, high energy consumption, long time consumption, and energy waste caused by restarting in a short time are solved.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A flowchart of a shutdown purge control method provided according to an embodiment of the present application;

[0020] Figure 2 A flowchart of a shutdown purge control method provided according to an embodiment of the present application;

[0021] Figure 3 A structural diagram of a fuel cell hydrogen and air subsystem provided according to an embodiment of the present application;

[0022] Figure 4 is an exemplary diagram of a shutdown purge control device according to an embodiment of the present application;

[0023] Figure 5 It is a schematic diagram of the structure of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0025] The shutdown purge control method, device, vehicle and medium of the embodiment of the present application are described below with reference to the accompanying drawings. In response to the problem of how to quickly and energy-efficiently shut down a fuel cell in a low-temperature environment mentioned in the above background technology, the present application provides a shutdown purge control method, in which different purge actions are performed at different shutdown times, which can effectively prevent the vehicle from being corroded by dust, water vapor and other factors during the shutdown process, thereby ensuring that the best cleaning effect can be achieved at any shutdown time; by adjusting the intensity and duration of the purge action according to the different shutdown times, unnecessary energy consumption can be avoided, energy conservation and emission reduction can be achieved, and the user experience can be improved. In this way, the problems of the inability to avoid the risk of icing, high energy consumption, long time consumption, and energy waste caused by restarting in a short time in the prior art are solved.

[0026] Specifically, Figure 1 A schematic flow chart of the shutdown purge control method provided in an embodiment of the present application.

[0027] like Figure 1 As shown, the shutdown purge control method includes the following steps:

[0028] In step S101 , the actual duration between the current time and the time when the vehicle starts to stop is identified.

[0029] The vehicle starts to shut down when the vehicle fuel cell power system is shut down.

[0030] It can be understood that the embodiment of the present application facilitates the subsequent selection of shutdown purge actions of different durations and intensities by identifying the actual duration between the current moment and the moment when the vehicle starts to shut down.

[0031] In step S102, if the actual shutdown time is less than the first preset time, a first shutdown purge action is performed.

[0032] The first preset time duration may be a time preset according to actual conditions, such as 10 seconds, etc., and the first shutdown purge action may be a simple air purge or a slight cooling operation.

[0033] It can be understood that in the embodiment of the present application, performing the first shutdown purge action within a short shutdown time can quickly clean up the residues or waste gas in the system. At the same time, since the purge time is relatively short, it helps to save energy and reduce unnecessary resource consumption.

[0034] In an embodiment of the present application, executing the first shutdown purge action includes operating the battery at the lowest power, opening the first stop valve, the second stop valve and the dehumidification bypass valve, closing the exhaust bypass valve, keeping the hydrogen subsystem valve assembly in operation, setting the pressure valve to a preset opening, and setting the first air compressor speed and the target temperature of the cooling system.

[0035] Among them, the preset opening can be determined according to actual conditions, such as 30%, etc., the speed of the first air compressor can be determined according to actual conditions, such as 50000rpm, etc., and the target temperature can be the maximum allowable temperature without specific limitation.

[0036] It is understandable that in the embodiment of the present application, the battery operates at the lowest power to reduce energy consumption, and the precise control of the valve switch state ensures the optimization of the purge path, avoids unnecessary energy waste, and improves the operating efficiency of the system; by setting the pressure valve to a preset opening, the flow rate and pressure of the gas can be controlled to prevent safety problems caused by excessive or insufficient pressure. In addition, adjusting the speed of the air compressor and the target temperature of the cooling system helps to maintain the stability of the internal temperature of the system and avoid potential risks caused by excessively high or low temperatures.

[0037] Specifically, Figure 2 As shown, after the fuel cell starts to shut down at low temperature, it first enters a rapid shutdown to ensure that the stack maintains a high temperature, so that it can be quickly started after a short shutdown. The fuel cell is reduced to operate at the lowest power, and the air subsystem achieves large flow and high pressure purge. The air compressor operates at the speed of the first air compressor, such as 50000rpm, and the stop valve 1, stop valve 2 and dehumidification bypass valve are opened. The back pressure valve is at a predetermined opening, such as 30%, and the exhaust bypass valve is closed. The hydrogen subsystem stop valve, hydrogen injection valve, hydrogen exhaust valve and drain valve remain in working condition; the cooling system sets the target temperature to the maximum allowable temperature to reduce heat loss.

[0038] like Figure 3 As shown, the fuel cell hydrogen subsystem includes a hydrogen bottle, a pressure reducing valve, a shut-off valve, a hydrogen injection valve, a hydrogen return device, a check valve, a water separator, a hydrogen discharge valve and a water drain valve, etc., and the fuel cell air subsystem includes an air filter, an air compressor, an intercooler, a humidifier, a first shut-off valve, a second shut-off valve, a back pressure valve, a dehumidification bypass valve and an exhaust bypass valve, etc.

[0039] In step S103, if the actual shutdown time is greater than or equal to the second preset time, a second shutdown purge action is performed, wherein the second preset time is greater than the first preset time, and the purge time of the second shutdown purge action is greater than the purge time of the first shutdown purge action.

[0040] Among them, the second preset time length can be a time pre-set according to actual conditions, such as 1 hour, etc., and the second shutdown purge action can be a stronger air purge, more comprehensive cooling or other forms of deep cleaning.

[0041] It can be understood that in the embodiment of the present application, performing a second shutdown purge action during a longer shutdown time can extend the purge time, thereby more effectively removing impurities and residual gases that may accumulate, helping to reduce the risk of failure during startup and improve overall operating efficiency; long-term shutdown may cause certain components or areas to accumulate more dirt or moisture. By performing a longer purge action, these components can be more effectively protected from corrosion or damage and their service life can be extended.

[0042] In an embodiment of the present application, a second shutdown purge action is performed, including: obtaining the battery stack temperature and the ambient temperature; if the battery stack temperature is lower than the preset battery stack temperature, and the ambient temperature is lower than the preset ambient temperature, then opening the dehumidification bypass valve, the first stop valve, the second stop valve and the back pressure valve, closing the exhaust bypass valve, and setting the second air compressor speed.

[0043] Among them, the battery stack temperature can be the overall temperature of the battery pack in the electric vehicle, the ambient temperature can be the temperature of the environment surrounding the battery system, the preset battery stack temperature can be determined according to actual conditions, such as 0°C, the preset ambient temperature can be determined according to actual conditions, such as -4°C, and the speed of the second air compressor can be determined according to actual conditions, such as 30,000 rpm.

[0044] It can be understood that the embodiment of the present application can accurately understand the current working environment conditions by monitoring the battery stack temperature and ambient temperature, and provide a suitable operating environment for the battery system; when the battery stack and ambient temperatures are both low, by adjusting the switching state of the valve and the speed of the second air compressor, energy consumption can be effectively reduced and energy efficiency can be improved.

[0045] Specifically, Figure 2 As shown, after not starting for a long time at low temperature, the liquid water that may condense in the air pipeline is purged and discharged to avoid freezing at low temperature. First, the controller enters a low power consumption state, and only the timer in the controller is kept working. The actual shutdown time reaches the second preset time, such as 1h, and the stack temperature and ambient temperature are monitored. If the stack temperature is lower than the preset stack temperature, such as 0°C, and the ambient temperature is lower than the preset ambient temperature, such as -4°C, the dehumidification bypass valve, the first stop valve, the second stop valve and the back pressure valve are opened, the exhaust bypass valve is closed, and the speed of the second air compressor is set, such as 30000rpm, to ensure large flow and low pressure.

[0046] In an embodiment of the present application, after opening the dehumidification bypass valve, the first stop valve, the second stop valve and the back pressure valve, closing the exhaust bypass valve and setting the speed of the second air compressor, it includes: obtaining the purge time; if the purge time is greater than the third preset time, closing the air compressor, the dehumidification bypass valve, the first stop valve, the second stop valve and the back pressure valve.

[0047] The purge time may be the duration of gas purge in the fuel cell, and the third preset time may be determined according to actual conditions, such as 60 seconds.

[0048] It can be understood that the embodiment of the present application monitors the purge time and shuts down the air compressor and other related valves when the preset conditions are reached, thereby preventing unnecessary wear caused by excessive purge, while reducing internal gas flow and improving overall stability.

[0049] Specifically, Figure 2 As shown, the purging time is greater than the third preset time, for example 60s. After shutting down the air compressor, the dehumidification bypass valve, the first stop valve, the second stop valve and the back pressure valve are closed to store the state of low-temperature purging, and the long-term shutdown purging is completed.

[0050] In the embodiment of the present application, it also includes: if the actual shutdown time is greater than or equal to the first preset time and less than the second preset time, executing the shutdown action.

[0051] It can be understood that when the embodiment of the present application confirms that the vehicle has been unused for a long time, executing the shutdown action can effectively reduce energy waste and lower standby power consumption, thereby achieving energy conservation and emission reduction.

[0052] In an embodiment of the present application, a shutdown action is performed, including: obtaining the battery voltage; if the battery voltage is less than a preset voltage, closing the first shut-off valve, the hydrogen exhaust valve, the water drain valve, the air compressor and the cooling system, and setting the hydrogen pressure to a preset pressure and the output current to a preset current.

[0053] Among them, the preset voltage can be determined according to the actual situation, such as 0.3V, the preset pressure can be determined according to the actual situation, such as 1.3bar, and the preset current can be determined according to the actual situation, such as 0A.

[0054] It can be understood that in the embodiment of the present application, when the battery voltage is lower than the preset voltage, it means that the battery power is already low and continued discharge may impair battery performance or even cause battery damage; timely shutting down related systems and adjusting the hydrogen pressure and output current can effectively prevent excessive discharge of the battery and avoid hydrogen leakage, moisture accumulation or other safety hazards that may be caused by continued operation, thereby improving safety and stability.

[0055] Specifically, Figure 2 As shown, if the actual shutdown time is greater than or equal to the first preset time and less than the second preset time, the fuel cell stack enters the discharge mode until the fuel cell voltage is lower than the preset voltage, for example, 0.3V per cell on average, and the first shut-off valve, hydrogen drain valve, drain valve, air compressor and cooling system are closed; the hydrogen pressure is set to the preset pressure, for example, 1.1 bar, and the fuel cell stack output current is set to 0A.

[0056] It should be noted that when the fuel cell voltage is higher than the preset voltage, the exhaust bypass valve is opened and the second shut-off valve is closed; the hydrogen target pressure is set to the preset pressure, such as 1.3 bar, and the cooling system operates at the lowest flow rate.

[0057] In an embodiment of the present application, after closing the first shut-off valve, the hydrogen discharge valve, the water drain valve, the air compressor and the cooling system, and setting the hydrogen pressure and the output current, it includes: obtaining the speed of the third air compressor; if the speed of the third air compressor is less than the preset speed, closing the hydrogen shut-off valve, the hydrogen injection valve, and the exhaust bypass valve.

[0058] The preset speed may be determined according to actual conditions, such as 500 rpm.

[0059] It can be understood that the purpose of closing the hydrogen shut-off valve, hydrogen injection valve, and exhaust bypass valve in the embodiment of the present application is to immediately cut off the supply and flow path of hydrogen when the air compressor speed is insufficient, so as to prevent safety problems caused by gas leakage or insufficient supply due to low air compressor speed.

[0060] Specifically, Figure 2 As shown, the speed of the third air compressor is lower than the preset speed, for example, 500 rpm, and the hydrogen shut-off valve, hydrogen injection valve and air exhaust bypass valve are closed; the temperature and other status information are stored until the stack temperature and ambient temperature are stored, and the rapid shutdown is completed.

[0061] According to the shutdown purge control method proposed in the embodiment of the present application, by performing different purge actions at different shutdown times, it is possible to effectively prevent the erosion of internal components of the vehicle due to dust accumulation, water vapor and other factors during the shutdown process, ensuring that the best cleaning effect can be achieved at any shutdown time; by adjusting the intensity and duration of the purge action according to the different shutdown times, it is possible to avoid unnecessary energy consumption, achieve energy conservation and emission reduction, and improve user experience. In this way, the problems of the inability to avoid the risk of icing, high energy consumption, long time consumption, and energy waste caused by restarting in a short time in the prior art are solved.

[0062] Next, the shutdown purge control device proposed according to the embodiment of the present application is described with reference to the accompanying drawings.

[0063] Figure 4 It is a block diagram of a shutdown purge control device according to an embodiment of the present application.

[0064] like Figure 4 As shown, the shutdown purge control device 10 includes: an acquisition module 100 , a first execution module 200 and a second execution module 300 .

[0065] Among them, the acquisition module 100 is used to identify the actual shutdown time between the current time and the time when the vehicle starts to shut down; the first execution module 200 is used to execute the first shutdown purge action if the actual shutdown time is less than the first preset time; the second execution module 300 is used to execute the second shutdown purge action if the actual shutdown time is greater than or equal to the second preset time, wherein the second preset time is greater than the first preset time, and the purge time of the second shutdown purge action is greater than the purge time of the first shutdown purge action.

[0066] It should be noted that the above explanation of the shutdown purge control method embodiment is also applicable to the shutdown purge control device of this embodiment, and will not be repeated here.

[0067] According to the shutdown purge control device proposed in the embodiment of the present application, by performing different purge actions at different shutdown times, it is possible to effectively prevent the erosion of internal components of the vehicle due to factors such as dust accumulation and water vapor during the shutdown process, ensuring that the best cleaning effect can be achieved at any shutdown time; adjusting the intensity and duration of the purge action according to the different shutdown times can avoid unnecessary energy consumption, achieve energy conservation and emission reduction, and improve user experience. In this way, the problems of the inability to avoid the risk of icing, high energy consumption, long time consumption, and energy waste caused by restarting in a short time in the prior art are solved.

[0068] Figure 5 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0069] A memory 501 , a processor 502 , and a computer program stored in the memory 501 and executable on the processor 502 .

[0070] When the processor 502 executes the program, the shutdown purge control method provided in the above embodiment is implemented.

[0071] Furthermore, the vehicle also includes:

[0072] The communication interface 503 is used for communication between the memory 501 and the processor 502 .

[0073] The memory 501 is used to store computer programs that can be executed on the processor 502 .

[0074] The memory 501 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0075] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected to each other through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0076] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can communicate with each other through an internal interface.

[0077] The processor 502 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0078] The embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the shutdown purge control method as described above is implemented.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0080] In addition, 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0081] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0082] It should be understood that the various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, the steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0083] A person of ordinary skill in the art may understand that all or part of the steps carried by the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the above-mentioned program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0084] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A shutdown purge control method, characterized in that: The following steps are involved: Identify the actual downtime duration between the current time and the time when the vehicle starts to stop; If the actual shutdown duration is less than the first preset duration, the first shutdown purge action is performed; the fuel cell hydrogen subsystem includes a hydrogen bottle, a pressure reducing valve, a stop valve, a hydrogen injection valve, a hydrogen return device, a check valve, a water separator, a hydrogen discharge valve and a drain valve, and the fuel cell air subsystem includes an air filter, an air compressor, an intercooler, a humidifier, a first stop valve, a second stop valve, a back pressure valve, a dehumidification bypass valve and an exhaust bypass valve; the execution of the first shutdown purge action includes operating the battery at the lowest power, opening the first stop valve at the inlet of the fuel cell air subsystem, the second stop valve and the dehumidification bypass valve at the outlet of the fuel cell air subsystem, closing the exhaust bypass valve, keeping the hydrogen subsystem valve assembly in operation, setting the back pressure valve to a preset opening, setting the first air compressor speed and the target temperature of the cooling system; If the actual shutdown time is greater than or equal to the second preset time, a second shutdown purge action is performed, wherein the second preset time is greater than the first preset time, and the purge time of the second shutdown purge action is greater than the purge time of the first shutdown purge action; If the actual shutdown time is greater than or equal to the first preset time and less than the second preset time, the shutdown action is executed; the execution of the shutdown action includes: obtaining the battery voltage; if the battery voltage is less than the preset voltage, closing the first stop valve, hydrogen discharge valve, water drain valve, air compressor and cooling system at the inlet of the fuel cell air subsystem, setting the hydrogen pressure to the preset pressure and the output current to the preset current; after closing the first stop valve, hydrogen discharge valve, water drain valve, air compressor and cooling system at the inlet of the fuel cell air subsystem and setting the hydrogen pressure and output current, it includes: obtaining the speed of the third air compressor; if the speed of the third air compressor is less than the preset speed, closing the hydrogen stop valve, hydrogen injection valve and exhaust bypass valve.

2. The shutdown purge control method according to claim 1, characterized in that: The performing of the second shutdown purge action includes: Obtain battery stack temperature and ambient temperature; If the battery stack temperature is lower than the preset battery stack temperature and the ambient temperature is lower than the preset ambient temperature, the dehumidification bypass valve, the first stop valve at the inlet of the fuel cell air subsystem, the second stop valve and the back pressure valve at the outlet of the fuel cell air subsystem are opened, the exhaust bypass valve is closed, and the speed of the second air compressor is set.

3. The shutdown purge control method according to claim 2, characterized in that: After opening the dehumidification bypass valve, the first stop valve at the inlet of the fuel cell air subsystem, the second stop valve and the back pressure valve at the outlet of the fuel cell air subsystem, closing the exhaust bypass valve, and setting the speed of the second air compressor, the method includes: Get the purge time; If the purge time is greater than the third preset time, the air compressor, the dehumidification bypass valve, the first stop valve at the inlet of the fuel cell air subsystem, the second stop valve at the outlet of the fuel cell air subsystem and the back pressure valve are closed.

4. A shutdown purge control device, characterized in that: include: An acquisition module, used to identify the actual downtime duration between the current time and the time when the vehicle starts to stop; The first execution module is used to execute the first shutdown purge action if the actual shutdown time is less than the first preset time; the fuel cell hydrogen subsystem includes a hydrogen bottle, a pressure reducing valve, a stop valve, a hydrogen injection valve, a hydrogen return device, a check valve, a water separator, a hydrogen discharge valve and a water drain valve, and the fuel cell air subsystem includes an air filter, an air compressor, an intercooler, a humidifier, a first stop valve, a second stop valve, a back pressure valve, a dehumidification bypass valve and an exhaust bypass valve; the execution of the first shutdown purge action includes operating the battery at the lowest power, opening the first stop valve at the inlet of the fuel cell air subsystem, the second stop valve and the dehumidification bypass valve at the outlet of the fuel cell air subsystem, closing the exhaust bypass valve, keeping the hydrogen subsystem valve assembly in operation, setting the back pressure valve to a preset opening, setting the first air compressor speed and the target temperature of the cooling system; A second execution module, configured to execute a second shutdown purge action if the actual shutdown time is greater than or equal to a second preset time, wherein the second preset time is greater than the first preset time, and the purge time of the second shutdown purge action is greater than the purge time of the first shutdown purge action; If the actual shutdown time is greater than or equal to the first preset time and less than the second preset time, the shutdown action is executed; the execution of the shutdown action includes: obtaining the battery voltage; if the battery voltage is less than the preset voltage, closing the first stop valve, hydrogen discharge valve, water drain valve, air compressor and cooling system at the inlet of the fuel cell air subsystem, setting the hydrogen pressure to the preset pressure and the output current to the preset current; after closing the first stop valve, hydrogen discharge valve, water drain valve, air compressor and cooling system at the inlet of the fuel cell air subsystem and setting the hydrogen pressure and output current, it includes: obtaining the speed of the third air compressor; if the speed of the third air compressor is less than the preset speed, closing the hydrogen stop valve, hydrogen injection valve and exhaust bypass valve.

5. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the shutdown purge control method according to any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: When the computer program or instruction is executed, the shutdown purge control method according to any one of claims 1 to 3 is implemented.

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