Method for purging a fuel cell engine

Abstract

The application relates to a purging control method of a fuel cell engine. The fuel cell engine system comprises a cooling device including a cooling pipeline passing through the inside of a cell stack of the fuel cell engine; the method comprises: in the case that the cell stack stops working, controlling the cooling device to introduce liquid into the cooling pipeline according to a first preset strategy to purge the cooling pipeline; and in the case that the temperature difference between the liquid entering the cell stack and the liquid flowing out of the cell stack is within a preset range, controlling the cooling device to be closed. The liquid flowing through the cooling pipeline adjusts the temperature inside the fuel cell stack, and when the temperature difference between the liquid entering the cell stack and the liquid flowing out of the cell stack is within the preset range, it represents that the balance of the temperature inside the fuel cell stack is good, the overall temperature is consistent, the local temperature of the cell stack is prevented from being too low to cause icing, and the cold start condition of the fuel cell engine is better.

Description

Technical Field

[0001] This application relates to the field of fuel cell technology, and in particular to a purging control method for a fuel cell engine. Background Technology

[0002] Proton exchange membrane fuel cells (fuel cells), as efficient and clean energy conversion devices, are used in vehicle power systems and need to meet the requirements of low-temperature environments. However, because the chemical reactions during fuel cell operation produce a large amount of water, ice may form inside the fuel cell when the ambient temperature is too low, thus affecting its normal operation. Therefore, how to prevent ice formation inside the fuel cell is a problem that needs to be solved. Summary of the Invention

[0003] Therefore, it is necessary to provide a purging control method for fuel cell engines that can purge the fuel cell engine to prevent icing and ensure the engine's cold start performance, thereby addressing the aforementioned technical problems.

[0004] A purging control method for a fuel cell engine, applied to a fuel cell engine system, the fuel cell engine system comprising: a cooling device, the cooling device including cooling pipes passing through the internal structure of the fuel cell stack of the fuel cell engine; the method comprising:

[0005] When the battery stack stops working, the cooling device is controlled to introduce liquid into the cooling pipeline according to a first preset strategy to purge the cooling pipeline;

[0006] When the temperature difference between the liquid entering the battery stack and the liquid flowing out of the battery stack is within a preset range, the cooling device is controlled to shut down.

[0007] In one embodiment, the fuel cell engine system includes: a first gas supply device connected to the cathode of the fuel cell stack of the fuel cell engine via a first gas pipeline; the purging control method for the fuel cell engine further includes:

[0008] When the battery stack stops working, the first gas supply device is controlled to supply gas into the first gas pipeline according to the second preset strategy in order to purge the first gas pipeline and the cathode of the battery stack.

[0009] If the execution time of the second preset strategy reaches the first threshold, the first gas supply device is controlled to shut down.

[0010] In one embodiment, the fuel cell engine system includes: a second gas supply device connected to the anode of the fuel cell stack of the fuel cell engine via a second gas pipeline; the purging control method for the fuel cell engine further includes:

[0011] When the battery stack stops working, the second gas supply device is controlled to supply gas into the second gas pipeline according to the third preset strategy in order to purge the second gas pipeline and the anode of the battery stack.

[0012] If the execution time of the third preset strategy reaches the second threshold, the second gas supply device is controlled to shut down.

[0013] In one embodiment, the first gas pipeline includes a first pipeline, a second pipeline, and a third pipeline. A first end of the first pipeline is connected to external air, a second end of the first pipeline is connected to the cathode inlet of the battery stack, a first end of the second pipeline is connected to the cathode outlet of the battery stack, and a second end of the second pipeline is connected to external air. A first end of the third pipeline is connected to the first end of the first pipeline, and a second end of the third pipeline is connected to the first end of the second pipeline. The first gas supply device includes: an air compressor disposed at the first end of the first pipeline for regulating the flow rate and pressure of the gas in the first pipeline; and a first shut-off valve. A first gas supply device is positioned between the first end of the first pipeline and the cathode inlet of the battery stack, used to open the passage between the first end of the first pipeline and the cathode inlet of the battery stack when the pipeline is turned on; a second shut-off valve is positioned between the cathode outlet of the battery stack and the second end of the second pipeline, used to open the passage between the cathode outlet of the battery stack and the second end of the second pipeline when the pipeline is turned on; a third shut-off valve is positioned between the first end and the second end of the third pipeline, used to open the passage between the first end and the second end of the third pipeline when the pipeline is turned on; the control of the first gas supply device to introduce gas into the first gas pipeline according to a second preset strategy includes:

[0014] The first and second shut-off valves are opened, and the third shut-off valve is closed, so as to control the air compressor to regulate the flow and pressure of the gas in the first pipeline according to the second preset strategy;

[0015] The second preset strategy includes: adjusting the flow rate of the gas in the first pipeline to a first flow rate and the pressure to a first pressure, and maintaining this for a first duration; periodically adjusting the flow rate and pressure of the gas in the first pipeline using a first sub-strategy until the execution number of the first sub-strategy reaches a first set number, wherein the first sub-strategy includes: adjusting the pressure of the gas in the first pipeline to a second pressure and maintaining this for a second duration, and then adjusting the pressure of the gas in the first pipeline to a third pressure and maintaining this for a third duration, wherein the second pressure is greater than the first pressure and the third pressure.

[0016] In one embodiment, after the first sub-strategy has been executed a first set number of times, controlling the first gas supply device to supply gas into the first gas pipeline according to a second preset strategy further includes:

[0017] The first and second shut-off valves are controlled to close, and the third shut-off valve is controlled to open. The air compressor is controlled to adjust the flow rate of the gas in the third pipeline to the second flow rate and the pressure to the fourth pressure, and maintain this pressure for the fourth duration.

[0018] In one embodiment, controlling the first gas supply device to shut down when the execution time of the second preset strategy reaches a first threshold includes:

[0019] After the air compressor adjusts the gas flow rate in the third pipeline to a second flow rate and a fourth pressure, and maintains this adjustment for a fourth duration, the first gas supply device is controlled to shut off.

[0020] In one embodiment, the first gas supply device further includes: a flow meter disposed at the inlet of the air compressor for measuring the flow rate of gas entering the air compressor; and a pressure sensor disposed at the cathode inlet of the battery stack for measuring the pressure of gas entering the cathode of the battery stack; the method further includes:

[0021] When the air compressor is controlled to adjust the flow rate and pressure of the gas in the first pipeline using the second preset strategy, if the gas flow rate does not reach the corresponding required flow rate and / or the gas pressure does not reach the corresponding required pressure within a first set time period, the first gas supply device is controlled to shut down.

[0022] In one embodiment, the second gas pipeline includes a fourth pipeline, a fifth pipeline, a sixth pipeline, and a seventh pipeline; the second gas supply device includes: a gas supply device, a gas-water separator, a water storage tank, a fourth shut-off valve, and a fifth shut-off valve; the gas supply device is connected to the first end of the fourth pipeline, the second end of the fourth pipeline is connected to the anode inlet of the battery stack, the first end of the fifth pipeline is connected to the anode outlet of the battery stack, the second end of the fifth pipeline is connected to the gas-water separator, the first outlet of the gas-water separator is connected to the water storage tank, the water storage tank is connected to external air through the sixth pipeline, the second outlet of the gas-water separator is connected to external air through the seventh pipeline, and the fourth shut-off valve is located at the second outlet of the gas-water separator and... Between the external air and the water storage tank, the fifth shut-off valve is disposed between the water storage tank and the external air. The gas supply device is used to supply hydrogen to the anode of the battery stack through the fourth pipeline. The gas-water separator is used to separate the gas discharged from the anode of the battery stack into nitrogen and water vapor, wherein the water vapor is discharged through a second outlet and the nitrogen is discharged through a first outlet. The water storage tank is used to store the water vapor discharged from the second outlet of the gas-water separator. The fourth shut-off valve is used to open the passage between the second outlet of the gas-water separator and the external air when it is open. The fifth shut-off valve is used to open the passage between the water storage tank and the external air when it is open. Controlling the second gas supply device to introduce gas into the second gas pipeline according to a third preset strategy includes:

[0023] The gas supply equipment is controlled to supply hydrogen, and the opening and closing of the fourth and fifth shut-off valves are controlled according to the third preset strategy.

[0024] The third preset strategy includes: periodically executing the second sub-strategy when the number of times the fourth shut-off valve is closed is less than the first preset number of times; periodically executing the third sub-strategy when the number of times the fifth shut-off valve is closed is less than the second preset number of times; wherein the second sub-strategy includes controlling the fourth shut-off valve to open and maintain it for a fifth duration, and then closing the fourth shut-off valve; and the third sub-strategy includes controlling the fifth shut-off valve to open and maintain it for a sixth duration, and then closing the fifth shut-off valve.

[0025] In one embodiment, controlling the second gas supply device to shut down when the execution time of the third preset strategy reaches a second threshold includes:

[0026] After both the second sub-strategy and the third sub-strategy have been executed, the second gas supply device is shut down.

[0027] In one embodiment, the gas supply device includes: a hydrogen storage tank, a hydrogen ejector, a hydrogen injector, and a sixth shut-off valve. The hydrogen storage tank is connected to the hydrogen ejector, the hydrogen ejector is connected to the hydrogen injector, the hydrogen injector is connected to the fourth pipeline, and the sixth shut-off valve is disposed between the hydrogen storage tank and the hydrogen ejector. Specifically: the hydrogen storage tank is used to store hydrogen; the sixth shut-off valve, when opened, opens the passage between the hydrogen storage tank and the hydrogen ejector; the hydrogen ejector draws hydrogen from the hydrogen storage tank to the inlet of the hydrogen injector; and the hydrogen injector injects hydrogen.

[0028] In one embodiment, the cooling pipeline includes an eighth pipeline, a ninth pipeline, a tenth pipeline, and an eleventh pipeline. The cooling device includes a first temperature sensor, a radiator, a thermostat, a water pump, and a second temperature sensor. The eighth pipeline is disposed inside the battery stack. The first end of the ninth pipeline is connected to the first end of the eighth pipeline, and the second end of the ninth pipeline is connected to both the first inlet of the thermostat and the radiator. The first end of the tenth pipeline is connected to the radiator, and the second end of the tenth pipeline is connected to the second inlet of the thermostat. The outlet of the thermostat is connected to the water pump, and the water pump is connected to the first end of the eleventh pipeline. The second end of the eleventh pipeline... The liquid is connected to the second end of the eighth pipe, flows into the battery stack through the second end of the eighth pipe, and flows out of the battery stack through the first end of the eighth pipe. A first temperature sensor is disposed at the first end of the eighth pipe, and a second temperature sensor is disposed at the second end of the eighth pipe. The first temperature sensor measures the temperature of the liquid flowing out of the battery stack; the second temperature sensor measures the temperature of the liquid flowing into the battery stack; the water pump regulates the flow rate and velocity of the liquid; the thermostat controls whether the liquid flows through the radiator; and controlling the cooling device to introduce liquid into the cooling pipe according to a first preset strategy includes:

[0029] The water pump speed is controlled to a set speed and the thermostat opening is controlled to a set opening, so that the water pump speed reaches the set speed and the liquid flowing into the water pump does not flow through the radiator.

[0030] In one embodiment, controlling the cooling device to shut down when the temperature difference between the liquid entering the battery stack and the liquid flowing out of the battery stack is within a preset range includes:

[0031] The temperatures of the liquid entering the battery stack and the liquid flowing out of the battery stack in the eighth pipeline are respectively obtained;

[0032] Determine the temperature difference between the liquid entering the battery stack and the liquid flowing out of the battery stack;

[0033] When the temperature difference between the liquid entering the battery stack and the liquid flowing out of the battery stack is within a preset range, the thermostat and the water pump are controlled to shut down.

[0034] In one embodiment, the purging control method for the fuel cell engine further includes: if, under the condition that the rotational speed of the water pump and the opening of the thermostat are adjusted and controlled according to a first preset strategy, the rotational speed of the water pump does not reach the preset rotational speed, and / or the opening of the thermostat does not reach the preset opening within a second preset time period, then the water pump and the thermostat are controlled to shut down.

[0035] The above-described purging control method for the fuel cell engine involves the following steps: When the fuel cell stack stops operating, i.e., when the vehicle's fuel cell engine is shut down, the cooling device is controlled to circulate liquid into the cooling pipes according to a first preset strategy to purge the cooling pipes. This ensures the unobstructed flow of the cooling pipes and, through purging, induces temperature changes within the fuel cell stack. When the temperature difference between the liquid entering and leaving the fuel cell stack is within a preset range, the cooling device is shut off, completing the purging process. The flow of liquid in the cooling pipes regulates the temperature inside the fuel cell stack. When the temperature difference between the liquid entering and leaving the fuel cell stack is within a preset range, it indicates good temperature uniformity within the fuel cell stack, maintaining a consistent overall temperature. This prevents localized freezing due to excessively low temperatures within the fuel cell stack and ensures better cold-start conditions for the fuel cell engine. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a flowchart illustrating the purging control method for a fuel cell engine in one embodiment;

[0038] Figure 2 This is a schematic diagram of the structure of a fuel cell engine system in one embodiment;

[0039] Figure 3 This is a schematic diagram of the fuel cell engine system in another embodiment;

[0040] Figure 4This is a flowchart illustrating the purging control method for a fuel cell engine in another embodiment;

[0041] Figure 5 This is a schematic diagram of the fuel cell engine system in yet another embodiment;

[0042] Figure 6 This is a flowchart illustrating the purging control method for a fuel cell engine in yet another embodiment;

[0043] Figure 7 This is a schematic diagram of the complete structure of a fuel cell engine system in one embodiment;

[0044] Figure 8 This is a flowchart illustrating the purging control method for a fuel cell engine in yet another embodiment.

[0045] Explanation of reference numerals in the attached figures:

[0046] 10-Battery stack, 20-Cooling device, 30-Cooling pipeline, 40-First gas supply device, 50-First gas pipeline, 11-Battery stack cathode, 60-Second gas supply device, 70-Second gas pipeline, 12-Battery stack anode, 51-First pipeline, 52-Second pipeline, 53-Third pipeline, 41-Air compressor, 42-First shut-off valve, 43-Second shut-off valve, 44-Third shut-off valve, 45-Flow meter, 46-Pressure sensor, 71-Fourth pipeline, 72- Fifth pipeline, 73-Sixth pipeline, 74-Seventh pipeline, 61-Gas supply equipment, 62-Gas-water separator, 63-Water storage tank, 64-Fourth shut-off valve, 65-Fifth shut-off valve, 66-Hydrogen storage tank, 67-Hydrogen ejector, 68-Hydrogen injector, 69-Sixth shut-off valve, 31-Eighth pipeline, 32-Ninth pipeline, 33-Tenth pipeline, 34-Eleventh pipeline, 21-First temperature sensor, 22-Radiator, 23-Thermostat, 24-Water pump, 25-Second temperature sensor. Detailed Implementation

[0047] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0049] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0050] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0051] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0052] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0053] In one embodiment, such as Figure 1 As shown, a purging control method for a fuel cell engine is provided, applicable to, for example... Figure 2 The fuel cell engine system shown includes a cooling device 20, which includes cooling pipes 30 passing through the battery stack 10 of the fuel cell engine; the method includes steps S100-S110.

[0054] In step S100, when the battery stack stops working, the cooling device is controlled to introduce liquid into the cooling pipes according to the first preset strategy to purge the cooling pipes.

[0055] When the battery stack stops working, it means the vehicle's fuel cell engine stops. In this situation, if the ambient temperature is too low and the temperature of the battery stack is uneven, localized areas within the battery stack may become too cold and freeze, affecting the normal operation of the fuel cell and consequently impacting the efficiency of the engine's next cold start. Therefore, the cooling device is controlled to introduce liquid into the cooling pipes according to a first preset strategy, using the flow of liquid to raise the temperature inside the battery stack.

[0056] Specifically, the first preset strategy can be to control the flow direction, flow path, flow velocity, flow rate, etc. of the liquid, and the specific control method can be adjusted according to the actual situation.

[0057] In step S110, if the temperature difference between the liquid entering the battery stack and the liquid flowing out of the battery stack is within a preset range, the cooling device is controlled to shut down.

[0058] Specifically, the liquid flowing through the cooling pipes absorbs heat, thereby causing temperature changes inside the battery stack. When the temperature difference between the liquid entering and leaving the battery stack is within a preset range, it indicates that the temperature inside the battery stack is balanced, and the temperature consistency throughout the entire battery stack meets the standard. The cooling device is only shut off when the temperature consistency inside the battery stack meets the standard, thus ensuring the purging effect.

[0059] In this embodiment, when the fuel cell stack stops operating, i.e., when the vehicle's fuel cell engine is shut down, the cooling device is controlled to purify the cooling pipes by introducing liquid according to a first preset strategy. This ensures the unobstructed flow of the cooling pipes and, through purging, induces temperature changes within the fuel cell stack. When the temperature difference between the liquid entering and exiting the fuel cell stack is within a preset range, the cooling device is shut off, completing the purging process. The flow of liquid in the cooling pipes regulates the temperature inside the fuel cell stack. When the temperature difference between the liquid entering and exiting the fuel cell stack is within the preset range, it indicates good temperature uniformity within the fuel cell stack, maintaining a consistent overall temperature. This prevents localized freezing due to excessively low temperatures within the fuel cell stack and ensures better cold-start conditions for the fuel cell engine.

[0060] In one embodiment, such as Figure 3 As shown, the fuel cell engine system includes: a first gas supply device 40, which is connected to the cathode 11 of the fuel cell stack of the fuel cell engine via a first gas pipeline 50. Figure 4 As shown, the purging control method for the fuel cell engine also includes steps S400-S410.

[0061] In step S400, when the battery stack stops working, the first gas supply device is controlled to supply gas into the first gas pipeline according to the second preset strategy to purge the first gas pipeline and the cathode of the battery stack.

[0062] In this scenario, the battery stack stopping operation means the vehicle's fuel cell engine is shut down. If the ambient temperature is too low and there is residual moisture inside the battery stack, it may cause ice to form inside, affecting the engine's subsequent cold start. During winter operation, the proton exchange membrane fuel cell engine produces a large amount of water at the cathode, which seeps into the anode, causing ice to form inside the battery stack anode. By introducing gas into the first gas pipeline and the cathode of the battery stack, residual moisture can be purged, thus preventing icing.

[0063] For example, the gas introduced into the first gas line may be air.

[0064] Step S410: When the execution time of the second preset strategy reaches the first threshold, control the first gas supply device to shut down.

[0065] Specifically, if the execution time of the second preset strategy reaches the first threshold, it indicates that the first gas pipeline and the cathode of the battery stack have been purged to the required standard. The second preset strategy can be to use conventional air pressure for purging, and then use high-pressure air and low-pressure air alternately for purging, using air with different flow rates and pressures to ensure the purging effect.

[0066] In this embodiment, the cathode of the battery stack is purged with gas, and a certain purging time is set to ensure that the purging effect meets the standard and that the cold start conditions of the fuel cell engine are better.

[0067] In one embodiment, such as Figure 5 As shown, the fuel cell engine system includes: a second gas supply device 60, which is connected to the anode 12 of the fuel cell stack via a second gas pipeline 70. Figure 6 As shown, the purging control method for the fuel cell engine also includes steps S600-S610.

[0068] In step S600, when the battery stack stops working, the second gas supply device is controlled to supply gas into the second gas pipeline according to the third preset strategy to purge the second gas pipeline and the anode of the battery stack.

[0069] In this scenario, the battery stack stopping operation means the vehicle's fuel cell engine is shut down. If the ambient temperature is too low and there is residual moisture inside the battery stack, it may cause ice to form inside, affecting the engine's subsequent cold start. During winter operation, the proton exchange membrane fuel cell engine produces a large amount of water at the cathode, which seeps into the anode, causing ice to form inside the anode of the battery stack. By introducing gas through the second gas pipeline and the anode of the battery stack, residual moisture in the anode can be purged, thus preventing ice formation.

[0070] For example, the gas introduced into the second gas line may be hydrogen.

[0071] Step S610: When the execution time of the third preset strategy reaches the second threshold, control the second gas supply device to shut down.

[0072] Specifically, if the execution time of the third preset strategy reaches the second threshold, it indicates that the second gas pipeline and the anode of the battery stack have been purged to the required standard. The third preset strategy can be to continuously introduce hydrogen into the second gas pipeline and then intermittently open the valves on the second gas pipeline to purge, ensuring the purging effect.

[0073] In this embodiment, the anode of the battery stack is purged with gas, and a certain purging time is set to ensure that the purging effect meets the standard and that the cold start conditions of the fuel cell engine are better.

[0074] In one embodiment, such as Figure 7 As shown, the first gas pipeline includes a first pipeline 51, a second pipeline 52, and a third pipeline 53. Wherein:

[0075] The first end of the first pipe 51 is connected to the outside air, the second end of the first pipe 51 is connected to the cathode inlet of the battery stack, the first end of the second pipe 52 is connected to the cathode outlet of the battery stack, the second end of the second pipe 52 is connected to the outside air, the first end of the third pipe 53 is connected to the first end of the first pipe 51, and the second end of the third pipe 53 is connected to the first end of the second pipe 52.

[0076] The first air supply device includes: an air compressor 41, a first shut-off valve 42, a second shut-off valve 43, and a third shut-off valve 44, wherein:

[0077] An air compressor 41 is located at the first end of the first pipeline 51 and is used to regulate the flow rate and pressure of the gas in the first pipeline 51.

[0078] Specifically, the air compressor 41 can draw in air from the outside, compress the air, and then eject the compressed air, thereby controlling the flow rate and pressure of the gas in the first pipeline 51.

[0079] The first shut-off valve 42 is disposed between the first end of the first pipeline 51 and the cathode inlet of the battery stack, and is used to open the passage between the first end of the first pipeline 51 and the cathode inlet of the battery stack when it is turned on.

[0080] Specifically, when the first shut-off valve 42 is closed, the first pipeline 51 is cut off, and gas cannot flow into the cathode of the battery stack through the first pipeline 51. When the first shut-off valve 42 is opened, the first pipeline 51 is open, and gas can flow into the cathode of the battery stack through the first pipeline 51.

[0081] The second shut-off valve 43 is disposed between the cathode outlet of the battery stack and the second end of the second pipeline 52, and is used to open the passage between the cathode outlet of the battery stack and the second end of the second pipeline 52 when it is turned on.

[0082] Specifically, when the second shut-off valve 43 is closed, the second pipeline 52 is cut off, and gas cannot flow through the second pipeline 52. When the second shut-off valve 43 is opened, the second pipeline 52 is opened, and gas can flow through the second pipeline 52.

[0083] The third shut-off valve 44 is disposed between the first end and the second end of the third pipeline 53, and is used to open the passage between the first end and the second end of the third pipeline 53 when it is opened.

[0084] Specifically, when the third shut-off valve 44 is closed, the third pipeline 53 is cut off, and gas cannot flow through the third pipeline 53. When the third shut-off valve 44 is opened, the third pipeline 53 is opened, and gas can flow through the third pipeline 53.

[0085] like Figure 8 As shown, step S400 involves controlling the first gas supply device to supply gas into the first gas pipeline according to a second preset strategy, including:

[0086] The first and second shut-off valves are opened, and the third shut-off valve is closed, so as to control the air compressor to regulate the flow and pressure of gas in the first pipeline according to the second preset strategy.

[0087] The second preset strategy includes: adjusting the gas flow rate in the first pipeline to a first flow rate and the pressure to a first pressure, and maintaining this position for a first duration. The gas flow rate and pressure in the first pipeline are periodically adjusted using the first sub-strategy until the first sub-strategy is executed a first set number of times. The first sub-strategy includes: adjusting the gas pressure in the first pipeline to a second pressure and maintaining this position for a second duration, then adjusting the gas pressure in the first pipeline to a third pressure and maintaining this position for a third duration, wherein the second pressure is greater than the first pressure, which is greater than the third pressure.

[0088] Specifically, the air compressor, the first shut-off valve, the second shut-off valve, and the third shut-off valve, when controlled according to the second preset strategy, have multiple control states, namely, air path standby state, normal purging state, high-pressure pulse purging state, low-pressure pulse purging state, fuel cell cathode purging completed state, air path accessory purging state, air path purging completed state, and air path purging failed state.

[0089] Before the second preset strategy is executed, i.e., before the air compressor starts working, the system is in standby mode. Then, the second preset strategy is executed. First, the first and second shut-off valves are opened, and the third shut-off valve is closed, thereby opening the circulation pipeline from external air to the battery stack cathode and back to external air. The air compressor is then controlled to adjust the gas flow rate in the first pipeline to a first flow rate and pressure to a first pressure, maintaining this for a first duration. This is the normal purging state, which can purge the battery stack cathode. The first flow rate and first pressure are pre-calibrated values ​​that meet the requirements of normal purging. Then, the first sub-strategy is periodically used to adjust the gas flow rate and pressure in the first pipeline until the first sub-strategy is executed a first set number of times. The first sub-strategy includes: adjusting the gas pressure in the first pipeline to a second pressure and maintaining it for a second duration (high-pressure pulse purging state); then adjusting the gas pressure in the first pipeline to a third pressure and maintaining it for a third duration (low-pressure pulse purging state). Once the first sub-strategy has been executed a first set number of times, the cathode purging of the battery stack is considered complete. At this point, the cathode of the battery stack is determined to have been purged.

[0090] In this embodiment, the cathode of the battery stack is purged by conventional purging, alternating high-pressure and low-pressure purging, and the number of purging cycles is set, i.e. the purging duration is set, thereby ensuring the purging effect and making the cold start state of the battery stack better.

[0091] In one embodiment, after the execution count of the first sub-strategy reaches a first preset number, step S400, controlling the first gas supply device to supply gas into the first gas pipeline according to the second preset strategy, further includes:

[0092] Control the first and second shut-off valves to close, and the third shut-off valve to open. Control the air compressor to adjust the gas flow rate in the third pipeline to the second flow rate and the pressure to the fourth pressure, and maintain this pressure for the fourth duration.

[0093] Specifically, by controlling the first and second shut-off valves to close and the third shut-off valve to open, the first and second pipelines are closed and the third pipeline is opened, thus achieving the purging of the accessory circuit. This is the air circuit accessory purging state.

[0094] For example, the first threshold can be the first duration + the first set number of times multiplied by (the second duration + the third duration) + the fourth duration.

[0095] In this embodiment, by controlling the first and second shut-off valves to close and the third shut-off valve to open, the air path can be adjusted, thereby achieving the purging of different pipelines in the first gas pipeline.

[0096] In one embodiment, step S410, controlling the first gas supply device to shut down when the execution time of the second preset strategy reaches a first threshold, includes:

[0097] After adjusting the gas flow rate in the third pipeline to the second flow rate and the pressure to the fourth pressure, and maintaining this pressure for the fourth duration, the first gas supply device is shut off.

[0098] Specifically, after the air compressor adjusts the gas flow rate in the third pipeline to the second flow rate and the pressure to the fourth pressure, and maintains this for the fourth duration, the third pipeline is also purged. At this point, the first pipeline, the second pipeline, the third pipeline, and the battery stack cathode have all been purged, and the first air supply device can be shut off. This control state is defined as the air path purging completion state.

[0099] In this embodiment, the first gas supply device is shut off only after the first pipeline, the second pipeline, the third pipeline, and the battery stack cathode have all been purged, thereby ensuring the purging effect.

[0100] In one embodiment, please continue to participate Figure 7 The first gas supply device also includes: a flow meter 45 and a pressure sensor 46, wherein:

[0101] The flow meter 45 is installed at the inlet of the air compressor 41 to measure the flow rate of the gas entering the air compressor 41.

[0102] Specifically, by setting up flow meter 45, the actual flow rate of gas in the first gas pipeline can be measured.

[0103] Pressure sensor 46 is installed at the cathode 11 inlet of the battery stack to measure the pressure of the gas entering the cathode 11 of the battery stack.

[0104] Specifically, by setting pressure sensor 46, the actual pressure of the gas entering the cathode of the battery stack can be measured.

[0105] The purging control method for the fuel cell engine further includes: when the air compressor is controlled to regulate the flow rate and pressure of the gas in the first pipeline according to the second preset strategy, if the gas flow rate does not reach the corresponding required flow rate and / or the gas pressure does not reach the corresponding required pressure within a first set time period, the first gas supply device is controlled to be shut down.

[0106] Specifically, when it is necessary to adjust the flow rate and pressure of gas in the first pipeline—for example, adjusting the gas flow rate to a first flow rate, a second flow rate, or a first, second, third, or fourth pressure—if the gas flow rate and / or pressure cannot reach the corresponding required adjustment within a certain period of time—for example, when the gas flow rate needs to be adjusted to the first flow rate, the air compressor is controlled to operate, but the measured actual gas flow rate fails to reach the first flow rate for a long time, then the flow rate adjustment is deemed to have failed. The same applies to pressure. In this case, a purging failure is determined, defined as an air path purging failure state.

[0107] For example, whether the purging is successful or fails, a corresponding prompt message will be issued to inform the driver.

[0108] In this embodiment, by setting a flow meter and a pressure sensor, the actual flow rate and actual pressure of the gas in the first gas supply line can be measured to determine whether the purging is successful. If the purging fails, the first gas supply device can be shut down in time to save energy. The driver will also be notified of the purging failure so that the driver can understand the situation.

[0109] In one embodiment, please see [link to previous article]. Figure 7 The second gas pipeline includes a fourth pipeline 71, a fifth pipeline 72, a sixth pipeline 73, and a seventh pipeline 74. The second gas supply device includes: a gas supply unit 61, a gas-water separator 62, a water storage tank 63, a fourth shut-off valve 64, and a fifth shut-off valve 65. Wherein:

[0110] The gas supply device 61 is connected to the first end of the fourth pipeline 71, the second end of the fourth pipeline 71 is connected to the inlet of the anode 12 of the battery stack, the first end of the fifth pipeline 72 is connected to the outlet of the anode 12 of the battery stack, the second end of the fifth pipeline 72 is connected to the gas-water separator 62, the first outlet of the gas-water separator 62 is connected to the water storage tank 63, the water storage tank 63 is connected to the outside air through the sixth pipeline 73, the second outlet of the gas-water separator 62 is connected to the outside air through the seventh pipeline 74, the fourth shut-off valve 64 is installed between the second outlet of the gas-water separator 62 and the outside air, and the fifth shut-off valve 65 is installed between the water storage tank 63 and the outside air.

[0111] The gas supply device 61 is used to supply hydrogen to the anode 12 of the battery stack through the fourth pipeline 71.

[0112] Specifically, the gas supply equipment 61 includes: a hydrogen storage tank 66, a hydrogen ejector 67, a hydrogen injector 68, and a sixth shut-off valve 69. The hydrogen storage tank 66 is connected to the hydrogen ejector 67, the hydrogen ejector 67 is connected to the hydrogen injector 68, and the hydrogen injector 68 is connected to the fourth pipeline 71. The sixth shut-off valve 69 is located between the hydrogen storage tank 66 and the hydrogen ejector 67. The hydrogen storage tank 66 is used to store hydrogen. The sixth shut-off valve 69, when open, opens the passage between the hydrogen storage tank 66 and the hydrogen ejector 67. The hydrogen ejector 67 draws hydrogen from the hydrogen storage tank 66 to the inlet of the hydrogen injector 68. The hydrogen injector 68 injects hydrogen.

[0113] The gas-water separator 62 is used to separate the gas discharged from the anode 12 of the battery stack into nitrogen and water vapor.

[0114] Water vapor is discharged through the second outlet, and nitrogen is discharged through the first outlet.

[0115] For example, the discharged nitrogen gas can be reintroduced into the hydrogen ejector 67 to drive the emission of hydrogen gas.

[0116] The water storage tank 63 is used to store the water vapor discharged from the second outlet of the gas-water separator 62.

[0117] The fourth shut-off valve 64 is used to open the passage between the second outlet of the air-water separator 62 and the outside air when it is open.

[0118] The fifth shut-off valve 65 is used to open the passage between the water storage tank 63 and the outside air when it is open.

[0119] Step S600, controlling the second gas supply device to supply gas into the second gas pipeline according to the third preset strategy, including:

[0120] The gas supply equipment is controlled to provide hydrogen, and the opening and closing of the fourth and fifth shut-off valves are controlled by a third preset strategy.

[0121] The third preset strategy includes: periodically executing the second sub-strategy when the number of times the fourth shut-off valve is closed is less than the first preset number of times; periodically executing the third sub-strategy when the number of times the fifth shut-off valve is closed is less than the second preset number of times. The second sub-strategy includes controlling the fourth shut-off valve to open and maintain it for a fifth duration, and then closing the fourth shut-off valve. The third sub-strategy includes controlling the fifth shut-off valve to open and maintain it for a sixth duration, and then closing the fifth shut-off valve.

[0122] Specifically, the gas supply equipment, the fourth shut-off valve, and the fifth shut-off valve, when controlled according to the third preset strategy, have multiple control states, namely, hydrogen circuit standby state, hydrogen circuit nitrogen venting valve open state, hydrogen circuit nitrogen venting valve closed state, hydrogen circuit drain valve open state, hydrogen circuit drain valve closed state, and hydrogen circuit flushing completed state.

[0123] Before the third preset strategy is implemented (i.e., before the gas supply equipment starts working), the hydrogen path is in standby mode. Then, the third preset strategy is implemented, controlling the fourth shut-off valve to open and remain open for a fifth duration. Since the fourth shut-off valve is located on the nitrogen discharge line of the gas-water separator, the hydrogen path nitrogen purging valve is open at this time. Then, the fourth shut-off valve is closed, and the process is repeated periodically until the fourth shut-off valve has closed a first preset number of times. Simultaneously, the fifth shut-off valve is also controlled to open and remain open for a sixth duration. Since the fifth shut-off valve is located on the water vapor discharge line of the gas-water separator, the hydrogen path drain valve is open at this time. Then, the fifth shut-off valve is closed, and the process is repeated periodically until the fifth shut-off valve has closed a second preset number of times. When both the fourth and fifth shut-off valves have closed a first preset number of times and a second preset number of times, the second gas supply line has been purged, and the hydrogen path flushing is complete.

[0124] In this embodiment, by controlling the gas supply equipment to continuously supply hydrogen and controlling the fourth and fifth shut-off valves to periodically open and close, the second gas supply pipeline and the battery stack anode are purged.

[0125] In one embodiment, step S610, controlling the second gas supply device to shut down when the execution time of the third preset strategy reaches the second threshold, includes:

[0126] After both the second and third sub-strategies have been executed, the second gas supply device is shut down.

[0127] Specifically, when both the second and third sub-strategies have been executed, that is, when the second sub-strategy has been executed periodically for the first preset number of times and the third sub-strategy has been executed periodically for the second preset number of times, the second gas supply pipeline and the battery stack anode are determined to be purged, and the hydrogen path is in the flushing completed state.

[0128] In this embodiment, the second gas supply device is shut off only after both the second gas supply pipeline and the battery stack anode have been purged, thereby ensuring the purging effect.

[0129] In one embodiment, please see [link to previous article]. Figure 7The cooling pipeline includes: eighth pipeline 31, ninth pipeline 32, tenth pipeline 33, and eleventh pipeline 34. The cooling device includes: first temperature sensor 21, radiator 22, thermostat 23, water pump 24, and second temperature sensor 25.

[0130] The eighth pipe 31 is located inside the battery stack 10. The first end of the ninth pipe 32 is connected to the first end of the eighth pipe 31, and the second end of the ninth pipe 32 is connected to the first inlet of the thermostat 23 and the radiator 22, respectively. The first end of the tenth pipe 33 is connected to the radiator 22, and the second end of the tenth pipe 33 is connected to the second inlet of the thermostat 23. The outlet of the thermostat 23 is connected to the water pump 24. The water pump 24 is connected to the first end of the eleventh pipe 34, and the second end of the eleventh pipe 34 is connected to the second end of the eighth pipe 31. Liquid flows into the battery stack through the second end of the eighth pipe 31 and flows out of the battery stack through the first end of the eighth pipe 31. The first temperature sensor 21 is located at the first end of the eighth pipe 31, and the second temperature sensor 25 is located at the second end of the eighth pipe 31.

[0131] The first temperature sensor 21 is used to measure the temperature of the liquid flowing out of the battery stack 10.

[0132] The second temperature sensor 25 is used to measure the temperature of the liquid flowing into the battery stack 10.

[0133] Pump 24 is used to regulate the flow rate and velocity of the liquid.

[0134] The thermostat 23 is used to control whether liquid flows through the radiator 22.

[0135] Specifically, by adjusting the opening of the thermostat 23, the path of the liquid can be controlled. The liquid path can be a large circulation path of battery stack → radiator 22 → thermostat 23 → water pump 24, or a small circulation path of battery stack → thermostat 23 → water pump 24.

[0136] Step S100, controlling the cooling device to introduce liquid into the cooling pipes according to a first preset strategy, including:

[0137] The pump speed is controlled to a set speed, and the thermostat opening is controlled to a set opening, so that the pump speed reaches the set speed and the liquid flowing into the pump does not flow through the radiator.

[0138] Specifically, in the first preset strategy, the opening degree of the thermostat is controlled to a set opening degree, preventing the liquid from flowing through the radiator. Therefore, the temperature change of the liquid is only affected by the internal temperature of the battery stack, facilitating the determination of the purging effect by the temperature difference between the liquid entering and leaving the battery stack. The water pump speed is adjusted to a set speed, which can regulate the liquid flow rate and velocity. The set speed is a pre-calibrated value that meets the purging requirements.

[0139] In this embodiment, by controlling the water pump speed to a set speed and the thermostat opening to a set opening, the purging requirements of the cooling pipes can be met.

[0140] In one embodiment, such as Figure 8 As shown, in step S100, if the temperature difference between the liquid entering the battery stack and the liquid flowing out of the battery stack is within a preset range, the cooling device is controlled to shut down, including steps S800-S820.

[0141] Step S800: Obtain the temperatures of the liquid entering the battery stack and the liquid flowing out of the battery stack in the eighth pipeline.

[0142] Specifically, the temperatures of the liquid entering the battery stack and the liquid flowing out of the battery stack in the eighth pipeline are obtained by the second temperature sensor and the first temperature sensor, respectively.

[0143] Step S810: Determine the temperature difference between the liquid entering the battery stack and the liquid flowing out of the battery stack.

[0144] In step S820, if the temperature difference between the liquid entering the battery stack and the liquid flowing out of the battery stack is within a preset range, the thermostat and water pump are shut down.

[0145] Specifically, when the temperature difference between the liquid entering the fuel cell stack and the liquid flowing out of the fuel cell stack is within a preset range, it indicates that the temperature inside the fuel cell stack is relatively uniform and the overall temperature is consistent. At this time, the inside of the fuel cell stack is less likely to freeze, so the thermostat and water pump are shut down.

[0146] In this embodiment, the temperature difference between the liquid entering and exiting the fuel cell stack is used to determine whether purging is complete, and subsequently, whether to shut down the thermostat and water pump. This ensures better cold-start conditions for the fuel cell engine.

[0147] In one embodiment, the purging control method for the fuel cell engine further includes: if the water pump speed does not reach the set speed and / or the thermostat opening does not reach the set opening within a second set time period, while adjusting and controlling the water pump speed and thermostat opening according to a first preset strategy, then controlling the water pump and thermostat to shut down.

[0148] Specifically, when it is necessary to adjust the speed of the water pump and the opening of the thermostat, if the water pump and / or thermostat have been controlled, but the speed and / or opening of the water pump and / or thermostat fail to reach the set speed and / or set opening for a long time, and the second set time has not been reached, then the adjustment is deemed to have failed, and the water pump and thermostat are turned off.

[0149] In this embodiment, if the water pump and thermostat fail to adjust, the water pump and thermostat are shut down to save energy and avoid unnecessary consumption.

[0150] It should be understood that, although Figure 1 , 4 The steps in flowcharts 6 and 8 are shown sequentially as indicated by the arrows; however, these steps are not necessarily executed in the exact order indicated by the arrows. Unless otherwise specified herein, there is no strict order requirement for the execution of these steps, and they can be performed in other orders. Furthermore, Figure 1 , 4 At least some of the steps in 6 and 8 may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0151] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0152] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0153] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0154] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A purging control method for a fuel cell engine, characterized in that, This invention relates to a fuel cell engine system, comprising: a cooling device including cooling pipes passing through the interior of the fuel cell stack; the cooling pipes including: an eighth pipe, a ninth pipe, a tenth pipe, and an eleventh pipe; the cooling device including: a first temperature sensor, a radiator, a thermostat, a water pump, and a second temperature sensor; the eighth pipe being disposed inside the fuel cell stack; the first end of the ninth pipe being connected to the first end of the eighth pipe; the second end of the ninth pipe being connected to the first inlet of the thermostat and the radiator; the first end of the tenth pipe being connected to the radiator; and the second end of the tenth pipe being connected to the second inlet of the thermostat. The outlet is connected to the water pump, the water pump is connected to the first end of the eleventh pipeline, the second end of the eleventh pipeline is connected to the second end of the eighth pipeline, liquid flows into the battery stack through the second end of the eighth pipeline, and flows out of the battery stack through the first end of the eighth pipeline. A first temperature sensor is disposed at the first end of the eighth pipeline, and a second temperature sensor is disposed at the second end of the eighth pipeline, wherein: the first temperature sensor is used to measure the temperature of the liquid flowing out of the battery stack; the second temperature sensor is used to measure the temperature of the liquid flowing into the battery stack; the water pump is used to regulate the flow rate and velocity of the liquid; the thermostat is used to control whether the liquid flows through the radiator; the method includes: When the battery stack stops working, the cooling device is controlled to introduce liquid into the cooling pipeline according to a first preset strategy to purge the cooling pipeline; When the temperature difference between the liquid entering the battery stack and the liquid flowing out of the battery stack is within a preset range, the cooling device is controlled to shut down; The control of the cooling device to introduce liquid into the cooling pipeline according to the first preset strategy includes: controlling the speed of the water pump to a set speed and controlling the opening of the thermostat to a set opening, so that the speed of the water pump reaches the set speed and the liquid flowing into the water pump does not flow through the radiator. The step of controlling the cooling device to shut down when the temperature difference between the liquid entering the battery stack and the liquid exiting the battery stack is within a preset range includes: acquiring the temperatures of the liquid entering the battery stack and the liquid exiting the battery stack in the eighth pipeline respectively; determining the temperature difference between the liquid entering the battery stack and the liquid exiting the battery stack; and controlling the thermostat and the water pump to shut down when the temperature difference between the liquid entering the battery stack and the liquid exiting the battery stack is within a preset range.

2. The purging control method for a fuel cell engine according to claim 1, characterized in that, The fuel cell engine system includes: a first gas supply device, which is connected to the cathode of the fuel cell stack of the fuel cell engine via a first gas pipeline; the method further includes: When the battery stack stops working, the first gas supply device is controlled to supply gas into the first gas pipeline according to the second preset strategy in order to purge the first gas pipeline and the cathode of the battery stack. If the execution time of the second preset strategy reaches the first threshold, the first gas supply device is controlled to shut down.

3. The purging control method for a fuel cell engine according to claim 1 or 2, characterized in that, The fuel cell engine system includes: a second gas supply device, which is connected to the anode of the fuel cell stack of the fuel cell engine via a second gas pipeline; the method further includes: When the battery stack stops working, the second gas supply device is controlled to supply gas into the second gas pipeline according to the third preset strategy in order to purge the second gas pipeline and the anode of the battery stack. If the execution time of the third preset strategy reaches the second threshold, the second gas supply device is controlled to shut down.

4. The purging control method for a fuel cell engine according to claim 2, characterized in that, The first gas pipeline includes a first pipeline, a second pipeline, and a third pipeline. The first end of the first pipeline is connected to the outside air, the second end of the first pipeline is connected to the cathode inlet of the battery stack, the first end of the second pipeline is connected to the cathode outlet of the battery stack, the second end of the second pipeline is connected to the outside air, the first end of the third pipeline is connected to the first end of the first pipeline, and the second end of the third pipeline is connected to the first end of the second pipeline. The first gas supply device includes: an air compressor disposed at the first end of the first pipeline for regulating the flow rate and pressure of the gas in the first pipeline; a first shut-off valve disposed between the first end of the first pipeline and the cathode inlet of the battery stack for opening the passage between the first end of the first pipeline and the cathode inlet of the battery stack when open; a second shut-off valve disposed between the cathode outlet of the battery stack and the second end of the second pipeline for opening the passage between the cathode outlet of the battery stack and the second end of the second pipeline when open; and a third shut-off valve disposed between the first end and the second end of the third pipeline for opening the passage between the first end and the second end of the third pipeline when open; the step of controlling the first gas supply device to supply gas into the first gas pipeline according to a second preset strategy includes: The first and second shut-off valves are opened, and the third shut-off valve is closed, so as to control the air compressor to regulate the flow and pressure of the gas in the first pipeline according to the second preset strategy; The second preset strategy includes: adjusting the flow rate of the gas in the first pipeline to a first flow rate and the pressure to a first pressure, and maintaining this for a first duration; periodically adjusting the flow rate and pressure of the gas in the first pipeline using a first sub-strategy until the execution number of the first sub-strategy reaches a first set number, wherein the first sub-strategy includes: adjusting the pressure of the gas in the first pipeline to a second pressure and maintaining this for a second duration, and then adjusting the pressure of the gas in the first pipeline to a third pressure and maintaining this for a third duration, wherein the second pressure is greater than the first pressure and the third pressure.

5. The purging control method for a fuel cell engine according to claim 4, characterized in that, After the first sub-strategy has been executed a first set number of times, controlling the first gas supply device to supply gas into the first gas pipeline according to the second preset strategy further includes: The first and second shut-off valves are controlled to close, and the third shut-off valve is controlled to open. The air compressor is controlled to adjust the flow rate of the gas in the third pipeline to the second flow rate and the pressure to the fourth pressure, and maintain this pressure for the fourth duration.

6. The purging control method for a fuel cell engine according to claim 5, characterized in that, The step of controlling the first gas supply device to shut down when the execution time of the second preset strategy reaches a first threshold includes: After the air compressor adjusts the gas flow rate in the third pipeline to a second flow rate and a fourth pressure, and maintains this adjustment for a fourth duration, the first gas supply device is controlled to shut off.

7. The purging control method for a fuel cell engine according to claim 4, characterized in that, The first gas supply device further includes: a flow meter, disposed at the inlet of the air compressor, for measuring the flow rate of gas entering the air compressor; and a pressure sensor, disposed at the cathode inlet of the battery stack, for measuring the pressure of gas entering the cathode of the battery stack; the method further includes: When the air compressor is controlled to adjust the flow rate and pressure of the gas in the first pipeline using the second preset strategy, if the gas flow rate does not reach the corresponding required flow rate and / or the gas pressure does not reach the corresponding required pressure within a first set time period, the first gas supply device is controlled to shut down.

8. The purging control method for a fuel cell engine according to claim 3, characterized in that, The second gas pipeline includes a fourth pipeline, a fifth pipeline, a sixth pipeline, and a seventh pipeline; the second gas supply device includes: a gas supply device, a gas-liquid separator, a water storage tank, a fourth shut-off valve, and a fifth shut-off valve; the gas supply device is connected to the first end of the fourth pipeline, the second end of the fourth pipeline is connected to the anode inlet of the battery stack, the first end of the fifth pipeline is connected to the anode outlet of the battery stack, the second end of the fifth pipeline is connected to the gas-liquid separator, the first outlet of the gas-liquid separator is connected to the water storage tank, the water storage tank is connected to the outside air through the sixth pipeline, the second outlet of the gas-liquid separator is connected to the outside air through the seventh pipeline, the fourth shut-off valve is located between the second outlet of the gas-liquid separator and the outside air, and the fifth shut-off valve is located between the water storage tank and the outside air. The gas supply device is used to supply hydrogen to the anode of the battery stack through the fourth pipeline; the gas-water separator is used to separate the gas discharged from the anode of the battery stack into nitrogen and water vapor, wherein the water vapor is discharged through a second outlet and the nitrogen is discharged through a first outlet; the water storage tank is used to store the water vapor discharged from the second outlet of the gas-water separator; the fourth shut-off valve is used to open the passage between the second outlet of the gas-water separator and the outside air when it is open; the fifth shut-off valve is used to open the passage between the water storage tank and the outside air when it is open; controlling the second gas supply device to introduce gas into the second gas pipeline according to a third preset strategy includes: The gas supply equipment is controlled to supply hydrogen, and the opening and closing of the fourth and fifth shut-off valves are controlled according to the third preset strategy. The third preset strategy includes: periodically executing the second sub-strategy when the number of times the fourth shut-off valve is closed is less than the first preset number of times; periodically executing the third sub-strategy when the number of times the fifth shut-off valve is closed is less than the second preset number of times; wherein the second sub-strategy includes controlling the fourth shut-off valve to open and maintain it for a fifth duration, and then closing the fourth shut-off valve; and the third sub-strategy includes controlling the fifth shut-off valve to open and maintain it for a sixth duration, and then closing the fifth shut-off valve.

9. The purging control method for a fuel cell engine according to claim 8, characterized in that, The step of controlling the second gas supply device to shut down when the execution time of the third preset strategy reaches the second threshold includes: After both the second sub-strategy and the third sub-strategy have been executed, the second gas supply device is shut down.

10. The purging control method for a fuel cell engine according to claim 8, characterized in that, The gas supply equipment includes: a hydrogen storage tank, a hydrogen ejector, a hydrogen injector, and a sixth shut-off valve. The hydrogen storage tank is connected to the hydrogen ejector, the hydrogen ejector is connected to the hydrogen injector, and the hydrogen injector is connected to the fourth pipeline. The sixth shut-off valve is located between the hydrogen storage tank and the hydrogen ejector. Specifically: the hydrogen storage tank is used to store hydrogen; the sixth shut-off valve, when opened, opens the passage between the hydrogen storage tank and the hydrogen ejector; the hydrogen ejector draws hydrogen from the hydrogen storage tank to the inlet of the hydrogen injector; and the hydrogen injector injects hydrogen.

11. The purging control method for a fuel cell engine according to claim 1, characterized in that, The method further includes: When the pump speed and thermostat opening are adjusted and controlled according to the first preset strategy, if the pump speed does not reach the preset speed and / or the thermostat opening does not reach the preset opening within a second preset time period, the pump and thermostat are controlled to shut down.

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