A vehicle fuel cell purge control system

Abstract

The application provides a vehicle fuel cell purging control system, and belongs to the technical field of fuel cells, and solves the problem of frequent use of winter purging in the prior art, which leads to reduced stack life and high hydrogen consumption. The system comprises a vehicle key switch, a vehicle controller, a purging execution device, a fuel cell and a fuel cell controller. The vehicle key switch comprises two states, a first key state representing that the key is in an inserted state, or the vehicle is in a low-voltage power supply state or a high-voltage preparation state, and a second key state representing that the key is in a pulled-out state. The fuel cell controller is internally provided with a normal purging program and a winter purging program, and the normal purging program is shorter than the winter purging program. The vehicle controller is used to start, identify that the vehicle key switch is in the first key state, and further identify that the vehicle is in a high-voltage state, and trigger the normal purging program when the vehicle is shut down; identify that the vehicle key switch is in the second key state, and trigger the winter purging program when the vehicle is shut down.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to a vehicle fuel cell purging control system. Background Technology

[0002] A fuel cell is a device that generates electricity through an oxidation reaction. When using hydrogen fuel cells in winter, the low temperature and high humidity conditions can cause some malfunctions, and purging can effectively address these issues. Winter purging in hydrogen fuel cells removes ice, eliminates moisture, and improves cell efficiency, ensuring normal operation and stable performance.

[0003] While purging is necessary in certain situations, frequent purging can have negative impacts on the fuel cell stack, including hydrogen waste, structural damage, material aging, and increased energy consumption. Therefore, in practical applications, the frequency and amount of purging need to be carefully controlled to balance the potential negative effects on the stack. Especially in winter, when the fuel cell is shut down and then restarted after a short interval, the time is insufficient to cause the stack temperature to drop too low and freeze. Under these conditions, purging should be avoided to protect the stack.

[0004] Existing technologies typically use ambient temperature and network communication to identify whether winter purging is required. If the current time falls within a winter purging period, winter purging is performed during fuel cell shutdown to prevent icing and protect the stack. However, performing winter purging at the end of the shutdown process when it is identified as a winter purging period cannot accurately distinguish whether winter purging is truly needed. This significantly increases the frequency of winter purging operations, resulting in negative impacts such as stack life loss and higher hydrogen consumption. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a vehicle fuel cell purging control system to solve the problems of reduced stack life and high hydrogen consumption caused by frequent winter purging in the prior art.

[0006] On one hand, embodiments of the present invention provide a vehicle fuel cell purging control system, including a vehicle key switch, a vehicle controller, a purging actuator, a fuel cell, and a fuel cell controller; wherein,

[0007] The vehicle key switch has two states. The first key state indicates that the key is inserted, or the vehicle is in a low-voltage power supply state or a high-voltage ready state. The second key state indicates that the key is removed.

[0008] The fuel cell controller has a built-in normal purging program and a winter purging program when the power is off. The normal purging program takes less time than the winter purging program.

[0009] The vehicle controller is used to identify when the vehicle key switch is in the first key state and further identify when the vehicle is in a high-voltage state, and then send a command to the fuel cell controller to execute a normal purging procedure when the vehicle is turned off; and to identify when the vehicle key switch is in the second key state, and send a command to the fuel cell controller to trigger a winter purging procedure when the vehicle is turned off; the input terminal of the vehicle controller is connected to the vehicle key switch, and its output terminal is connected to the purging actuator and the control terminal of the fuel cell via the fuel cell controller.

[0010] The beneficial effects of the above technical solution are as follows: This solution solves the problems of reduced stack life and high hydrogen consumption caused by frequent winter purging in existing technologies. By combining on-board usage conditions, increasing the communication signal between the vehicle and the fuel cell system, and optimizing the purging control logic of the fuel cell system, unnecessary purging operations are greatly reduced, thereby improving the life of the fuel cell.

[0011] Based on further improvements to the aforementioned system, both the normal purging procedure during shutdown and the winter purging procedure include high-flow-rate air purging of the fuel cell stack and high-speed hydrogen circulation for rapid drainage; furthermore...

[0012] The ventilation flow rate for a standard purging procedure is 70 g / s, the air temperature is above 0℃, and the time is T1≤8s.

[0013] The ventilation flow rate for the winter purging procedure is 89 g / s, the air temperature is less than or equal to 0℃, and the time T2 satisfies 35 ≤ T2 ≤ 55 s.

[0014] Furthermore, the vehicle's fuel cell purging control system also includes the vehicle's battery; among which,

[0015] The charging terminal of the vehicle battery is connected to the power supply terminal of the fuel cell, and the control terminal is connected to the vehicle controller.

[0016] Furthermore, the vehicle controller performs the following steps to complete the purging control function:

[0017] After the vehicle is stopped and then turned on, the state of the vehicle key switch is identified. If it is in the first key state, the next step is executed; if it is in the second key state, the state of the vehicle key switch at the next moment is identified.

[0018] Identify whether the fuel cell needs to be started. If so, proceed to the next step; otherwise, maintain the existing state of the fuel cell.

[0019] Send a start command to the fuel cell to control the fuel cell to start;

[0020] After receiving the shutdown command, the system identifies whether the vehicle battery SOC is higher than a set threshold. If so, it sends a first shutdown command to the fuel cell controller, controls the purging actuator to perform a normal purging procedure, and monitors the vehicle status and the status of the vehicle key switch during and after the normal purging procedure. If the vehicle enters a low-pressure state or the vehicle key switch is in the second key state, it proceeds to the next step; otherwise, it shuts down the fuel cell after purging. If not, it obtains the vehicle status and the status of the vehicle key switch. After identifying that the vehicle is in a high-pressure state or the vehicle key switch is in the first key state, it controls the fuel cell to maintain its current state. After identifying that the vehicle enters a low-pressure state or the vehicle key switch is in the second key state, it proceeds to the next step.

[0021] A second shutdown command is sent to the fuel cell controller to control the purging actuator to perform the winter purging procedure and then shut down the fuel cell.

[0022] Furthermore, the vehicle controller performs the following steps to complete the purging control function:

[0023] After the vehicle is stopped and then turned on, the state of the vehicle key switch is identified. If it is in the first key state, the next step is executed; if it is in the second key state, the state of the vehicle key switch at the next moment is identified.

[0024] Identify whether the fuel cell needs to be started. If so, proceed to the next step; otherwise, maintain the existing state of the fuel cell.

[0025] Send a start command to the fuel cell to control the fuel cell to start;

[0026] After receiving the shutdown command, identify whether the vehicle battery SOC is higher than the set threshold. If so, proceed to the next step; otherwise, control the fuel cell to continue charging the vehicle battery without shutting down, and identify the vehicle battery SOC again.

[0027] The first shutdown command is sent to the fuel cell controller, which controls the purging actuator to perform a normal purging procedure and then shuts down the fuel cell.

[0028] After the vehicle is briefly stopped and restarted, upon receiving a shutdown command, the system identifies the state of the vehicle key switch. If it is in the second key state, the system proceeds to the next step; if it is in the first key state, the system identifies the state of the vehicle key switch at the next moment.

[0029] A second shutdown command is sent to the fuel cell controller to control the purging actuator to perform the winter purging procedure and then shut down the fuel cell.

[0030] Furthermore, the vehicle controller performs the following steps to complete the timing adjustment function for the normal purging procedure:

[0031] Acquire real-time environmental parameters, fuel cell startup time, and total fuel cell runtime;

[0032] Based on the aforementioned real-time environmental parameters, the fuel cell's operating time after startup, and the fuel cell's total operating time, the optimized time for the normal purging procedure is determined so that the fuel cell is in a normal state after restarting following the completion of purging.

[0033] Furthermore, the vehicle controller performs the following steps to complete the time adjustment function for the winter purging procedure:

[0034] The system acquires real-time environmental parameters, the total time taken for the vehicle to restart after a long period of inactivity and perform a normal purging procedure, the total operating time of the fuel cell after the vehicle restarts after a long period of inactivity, and the total operating time of the fuel cell.

[0035] Based on the above real-time environmental parameters, the total time for the vehicle to restart after a long period of inactivity and perform the normal purging procedure, the total operating time of the fuel cell after the vehicle restarts after a long period of inactivity, and the total operating time of the fuel cell, the time for the optimized normal purging procedure is determined so that the fuel cell will not freeze again under low-temperature conditions after purging.

[0036] Furthermore, the real-time environmental parameters include ambient temperature and ambient humidity.

[0037] Furthermore, the vehicle controller also has a built-in low-temperature open-circuit purging startup purging program, which performs the following steps to complete the fuel cell pre-startup purging function:

[0038] Identify whether there are start-up obstacles in the fuel cell;

[0039] If there is a starting obstacle in the fuel cell, the fuel cell will not be started. Instead, the purging actuator will be controlled to execute the start-up purging procedure to purge the fuel cell before starting it.

[0040] If there are no startup obstacles to the fuel cell, then control the fuel cell to start directly.

[0041] Furthermore, the start-up purging procedure includes high-flow-rate air purging of the fuel cell stack; and,

[0042] The ventilation flow rate during the start-up purging procedure is 70 g / s. 3 The temperature is greater than or equal to -35℃, and the time taken is T3.

[0043] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify essential or essential features of the invention, nor is it intended to limit the scope of the invention. Attached Figure Description

[0044] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same parts.

[0045] Figure 1 A schematic diagram of the fuel cell stack ventilation and purging flow rate calibration device of Embodiment 1 is shown;

[0046] Figure 2 A schematic diagram of the wiring connection of the fuel cell stack ventilation and purging flow rate calibration device in Embodiment 2 is shown.

[0047] Figure 3 A schematic diagram of the purging control process in Example 2 is shown.

[0048] Figure Labels

[0049] 1-Vehicle key switch; 2-First key switch status connection line; 3-Second key switch status connection line; 4-CAN line. Detailed Implementation

[0050] Embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0051] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0052] Example 1

[0053] One embodiment of the present invention discloses a vehicle fuel cell purging control system, such as... Figure 1 As shown, it includes a vehicle key switch 1, a vehicle controller, a purging actuator, a fuel cell, and a fuel cell controller.

[0054] The fuel cell controller has a built-in normal purging program and a winter purging program for shutdown, with the normal purging program taking less time than the winter purging program.

[0055] The vehicle key switch 1 has two or more states. The first key state indicates that the key is inserted, or that the vehicle is in a low-voltage power supply state or a high-voltage ready state. The second key state indicates that the key is removed. The vehicle key is inserted into the vehicle and is in either the first key state or the second key state of the vehicle key switch 1.

[0056] The vehicle key switch 1 is equipped with a first key switch status connection line 2 and a second key switch status connection line 3, which are connected to the vehicle controller to monitor whether the vehicle key switch 1 is in the first key state or the second key state.

[0057] The vehicle controller is used to, upon activation, identify that the vehicle key switch 1 is in the first key state and further identify that the vehicle is in a high-voltage state, and then send a command to the fuel cell controller to execute a normal purging procedure when the vehicle is powered off; and to, upon identifying that the vehicle key switch 1 is in the second key state, send a command to the fuel cell controller to trigger a winter purging procedure when the vehicle is powered off.

[0058] The input terminal of the vehicle controller is connected to the vehicle key switch 1, and its output terminal is connected to the purging actuator and the control terminal of the fuel cell after passing through the fuel cell controller.

[0059] During implementation, the vehicle controller collects the status of the vehicle key switch 1, completes vehicle system control, and performs operations such as starting and stopping the fuel cell and setting the target mileage.

[0060] The vehicle controller and the fuel cell are connected via CAN line 4. CAN line 4 serves as the carrier for information communication between the vehicle controller and the fuel cell, such as... Figure 2 As stated above.

[0061] Fuel cells provide power to vehicles.

[0062] The standard purging procedure involves performing the routine purging during shutdown. After purging, the fuel cell is still at risk of icing and damage due to the low temperature conditions.

[0063] The winter purging procedure performs a purging process to prepare for low-temperature (freezing point and below) storage. After purging, the fuel cell is in a low-temperature condition with no risk of freezing damage and can be stored or restarted under low-temperature conditions.

[0064] The input commands for shutting down the fuel cell are divided into normal purging commands and winter purging commands. The fuel cell is set to have two modes: normal purging and winter purging.

[0065] When the vehicle key is removed from the ignition, it serves as a signal and is recognized by the vehicle controller as the trigger condition for the winter blow-out command.

[0066] When the vehicle key is not removed from the ignition and the vehicle is under high voltage, a normal purging command is sent when the fuel cell is shut down. When the vehicle key is removed from the ignition, a winter purging command needs to be sent by the vehicle controller.

[0067] Compared with existing technologies, the fuel cell stack ventilation and purging flow rate calibration device provided in this embodiment solves the problem of reduced stack life and high hydrogen consumption caused by frequent winter purging in existing technologies. By combining on-board usage conditions, increasing the communication signal between the vehicle and the fuel cell system, and optimizing the purging control logic of the fuel cell system, unnecessary purging operations are greatly reduced, thereby improving the life of the fuel cell.

[0068] Example 2

[0069] Based on Example 1, improvements were made to both the normal purging procedure during shutdown and the winter purging procedure, which included high-flow-rate air purging of the fuel cell stack and high-speed hydrogen circulation for rapid drainage.

[0070] The ventilation flow rate for a standard purging procedure is 70 g / s, the air temperature is above 0℃, and the time T1 ≤ 8s.

[0071] The ventilation flow rate for the winter purging procedure is 89 g / s, the air temperature is less than or equal to 0℃, and the purging time T2 meets the condition 35 ≤ T2 ≤ 55 s. The above ranges are parameter ranges calibrated in the laboratory to effectively protect the performance of the fuel cell and can effectively protect the service life of the fuel cell.

[0072] Preferably, the vehicle fuel cell purging control system further includes a vehicle battery. The charging terminal of the vehicle battery is connected to the power supply terminal of the fuel cell, and the control terminal is connected to the vehicle controller.

[0073] Preferably, such as Figure 3 As shown, the vehicle controller performs the following steps to complete the purging control function:

[0074] S1. After the vehicle is stopped and then turned on, identify the state of the vehicle key switch 1. If it is in the first key state, proceed to the next step. If it is in the second key state, proceed to identify the state of the vehicle key switch 1 at the next moment.

[0075] S2. Identify whether the fuel cell needs to be started. If yes, proceed to the next step; otherwise, maintain the current state of the fuel cell.

[0076] S3. Send a start-up command to the fuel cell to control the fuel cell to start up;

[0077] S4. After receiving the shutdown command, identify whether the vehicle battery SOC is higher than the set threshold; if so, send a first shutdown command (shutdown command A, including the command to start the normal purging program) to the fuel cell controller, control the purging actuator to execute the normal purging program (including the command to start the normal purging program), and monitor the vehicle status and the status of the vehicle key switch 1 during and after the execution of the normal purging program. If the vehicle enters a low-pressure state or the vehicle key switch 1 is in the second key state, proceed to the next step; otherwise, shut down the fuel cell after the purging is completed; if not, obtain the vehicle status and the status of the vehicle key switch 1, identify that the vehicle is in a high-pressure state or the vehicle key switch 1 is in the first key state, control the fuel cell to maintain the current state unchanged, and identify that the vehicle enters a low-pressure state or the vehicle key switch 1 is in the second key state, proceed to the next step.

[0078] S5. Send a second shutdown command (shutdown command B, which includes a command to start the winter purging program) to the fuel cell controller, and control the purging actuator to execute the winter purging program and then shut down the fuel cell.

[0079] Preferably, such as Figure 3 The vehicle controller performs the following steps to complete the purging control function:

[0080] SS1. After the vehicle is stopped and then turned on, identify the state of the vehicle key switch 1. If it is in the first key state, proceed to the next step. If it is in the second key state, proceed to identify the state of the vehicle key switch 1 at the next moment.

[0081] SS2. Identify whether the fuel cell needs to be started. If yes, proceed to the next step; otherwise, maintain the current state of the fuel cell.

[0082] SS3. Sends a start-up command to the fuel cell to control its start-up;

[0083] SS4. After receiving the shutdown command, identify whether the vehicle battery SOC is higher than the set threshold. If so, proceed to the next step; otherwise, control the fuel cell to continue charging the vehicle battery without shutting down, and identify the vehicle battery SOC again.

[0084] SS5. Send the first shutdown command to the fuel cell controller, control the purging actuator to perform the normal purging procedure and then shut down the fuel cell;

[0085] SS6. After the vehicle is briefly stopped and restarted, upon receiving the power off command, identify the state of the vehicle key switch 1. If it is in the second key state, proceed to the next step; if it is in the first key state, proceed to identify the state of the vehicle key switch 1 at the next moment.

[0086] SS7. Issue a second shutdown command to the fuel cell controller, control the purging actuator to perform the winter purging procedure and then shut down the fuel cell.

[0087] Preferably, the vehicle controller performs the following steps to complete the time adjustment function of the normal purging procedure:

[0088] S6. Obtain real-time environmental parameters, fuel cell startup time, and total fuel cell startup time;

[0089] S7. Based on the above real-time environmental parameters, the fuel cell's operating time after startup, and the fuel cell's total operating time, determine the time required for the optimized ordinary purging procedure (which can be output by a calibrated deep learning system to ensure the best performance of restarting the fuel cell and the longest stack lifespan) so that the fuel cell is in a normal state after restarting following the completion of purging.

[0090] Preferably, the vehicle controller performs the following steps to complete the time adjustment function of the winter purging procedure:

[0091] S8. Obtain real-time environmental parameters, the total time for the vehicle to restart after a long period of inactivity and perform the normal purging procedure, the total operating time of the fuel cell after the vehicle restarts after a long period of inactivity, and the total operating time of the fuel cell.

[0092] S9. Based on the above real-time environmental parameters, the total time for the vehicle to restart after a long period of shutdown and perform the normal purging procedure, the total operating time of the fuel cell after the vehicle to restart after a long period of shutdown, and the total operating time of the fuel cell, determine the time for the optimized normal purging procedure (which can be output by a calibrated deep learning system to achieve the best performance of restarting the fuel cell and the longest stack lifespan) so that the fuel cell will not freeze again under low temperature conditions after purging.

[0093] Preferably, the real-time environmental parameters include ambient temperature and ambient humidity.

[0094] Preferably, the vehicle controller also has a built-in low-temperature open-circuit purging startup purging program, which performs the following steps to complete the fuel cell pre-startup purging function:

[0095] S10. Identify whether there are start-up obstacles in the fuel cell;

[0096] S11. If there is a starting obstacle in the fuel cell, the fuel cell is not started, and the purging actuator is controlled to execute the starting purging procedure to purge the fuel cell before starting the fuel cell.

[0097] S12. If there is no starting obstacle to the fuel cell, control the fuel cell to start directly.

[0098] Preferably, the start-up purging procedure includes high-flow-rate air purging of the fuel cell stack. Furthermore, the ventilation flow rate of the start-up purging procedure is 70 g / s. 3 The temperature is greater than or equal to -35℃, and the time taken is T3.

[0099] Compared with the prior art, the vehicle fuel cell purging control system provided in this embodiment has the following beneficial effects:

[0100] 1. Normal purging shutdown can ensure the performance of fuel cell when restarting after a short shutdown, effectively reducing unnecessary purging during winter shutdown.

[0101] 2. Winter purging shutdown ensures that the fuel cell is in a low-temperature condition after purging without the risk of freezing and damage, and can be stored or restarted under low-temperature conditions.

[0102] 3. Effectively reduces frequent shutdowns of fuel cells in winter. The adoption of winter purging shutdown operation greatly improves the lifespan of fuel cells and increases hydrogen utilization.

[0103] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or improvements to the prior art of the embodiments, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A vehicle fuel cell purging control system, characterized in that, This includes the vehicle key switch, vehicle controller, purging actuator, fuel cell, and fuel cell controller; among which, The vehicle key switch has two states. The first key state indicates that the key is inserted, or the vehicle is in a low-voltage power supply state or a high-voltage ready state. The second key state indicates that the key is removed. The fuel cell controller has a built-in normal purging program and a winter purging program when the power is off. The normal purging program takes less time than the winter purging program. The vehicle controller is used to identify when the vehicle key switch is in the first key state and further identify when the vehicle is in a high-voltage state, and then send a command to the fuel cell controller to execute a normal purging procedure when the vehicle is turned off; and to identify when the vehicle key switch is in the second key state, and send a command to the fuel cell controller to trigger a winter purging procedure when the vehicle is turned off; the input terminal of the vehicle controller is connected to the vehicle key switch, and its output terminal is connected to the purging actuator and the control terminal of the fuel cell via the fuel cell controller; Both the normal purging procedure during shutdown and the winter purging procedure include high-flow-rate air purging of the fuel cell stack and high-speed hydrogen circulation for rapid drainage; and... The ventilation flow rate for a standard purging procedure is 70 g / s, the air temperature is above 0°C, and the time required is... T 1≤8s; The ventilation flow rate for the winter purging program is 89 g / s, the air temperature is less than or equal to 0℃, and the time required is... T 2 satisfies 35≤ T 2≤55s.

2. The vehicle fuel cell purging control system according to claim 1, characterized in that, This also includes vehicle batteries; among which, The charging terminal of the vehicle battery is connected to the power supply terminal of the fuel cell, and the control terminal is connected to the vehicle controller.

3. The vehicle fuel cell purging control system according to claim 2, characterized in that, The vehicle controller performs the following steps to complete the purging control function: After the vehicle is stopped and then turned on again, the status of the vehicle key switch is identified. If it is in the first key state, proceed to the next step; if it is in the second key state, proceed to identify the status of the vehicle key switch at the next moment. Identify whether the fuel cell needs to be started. If so, proceed to the next step; otherwise, maintain the existing state of the fuel cell. Send a start command to the fuel cell to control the fuel cell to start; After receiving the shutdown command, the system identifies whether the vehicle battery SOC is higher than a set threshold. If so, it sends a first shutdown command to the fuel cell controller, controls the purging actuator to perform a normal purging procedure, and monitors the vehicle status and the status of the vehicle key switch during and after the normal purging procedure. If the vehicle enters a low-pressure state or the vehicle key switch is in the second key state, it proceeds to the next step; otherwise, it shuts down the fuel cell after purging. If not, it obtains the vehicle status and the status of the vehicle key switch. After identifying that the vehicle is in a high-pressure state or the vehicle key switch is in the first key state, it controls the fuel cell to maintain its current state. After identifying that the vehicle enters a low-pressure state or the vehicle key switch is in the second key state, it proceeds to the next step. A second shutdown command is sent to the fuel cell controller to control the purging actuator to perform the winter purging procedure and then shut down the fuel cell.

4. The vehicle fuel cell purging control system according to claim 2, characterized in that, The vehicle controller performs the following steps to complete the purging control function: After the vehicle is stopped and then turned on again, the status of the vehicle key switch is identified. If it is in the first key state, proceed to the next step; if it is in the second key state, proceed to identify the status of the vehicle key switch at the next moment. Identify whether the fuel cell needs to be started. If so, proceed to the next step; otherwise, maintain the existing state of the fuel cell. Send a start command to the fuel cell to control the fuel cell to start; After receiving the shutdown command, identify whether the vehicle battery SOC is higher than the set threshold. If so, proceed to the next step; otherwise, control the fuel cell to continue charging the vehicle battery without shutting down, and identify the vehicle battery SOC again. The first shutdown command is sent to the fuel cell controller, which controls the purging actuator to perform a normal purging procedure and then shuts down the fuel cell. After the vehicle is briefly stopped and restarted, upon receiving a shutdown command, the system identifies the state of the vehicle key switch. If it is in the second key state, the system proceeds to the next step; if it is in the first key state, the system identifies the state of the vehicle key switch at the next moment. A second shutdown command is sent to the fuel cell controller to control the purging actuator to perform the winter purging procedure and then shut down the fuel cell.

5. A vehicle fuel cell purging control system according to any one of claims 1-4, characterized in that, The vehicle controller performs the following steps to complete the timing adjustment function for the normal purging procedure: Acquire real-time environmental parameters, fuel cell startup time, and total fuel cell runtime; Based on the aforementioned real-time environmental parameters, the fuel cell's operating time after startup, and the fuel cell's total operating time, the optimized time for the normal purging procedure is determined so that the fuel cell is in a normal state after restarting following the completion of purging.

6. A vehicle fuel cell purging control system according to claim 5, characterized in that, The vehicle controller performs the following steps to complete the time adjustment function for the winter purging procedure: The system acquires real-time environmental parameters, the total time taken for the vehicle to restart after a long period of inactivity and perform a normal purging procedure, the total operating time of the fuel cell after the vehicle restarts after a long period of inactivity, and the total operating time of the fuel cell. Based on the above real-time environmental parameters, the total time for the vehicle to restart after a long period of inactivity and perform the normal purging procedure, the total operating time of the fuel cell after the vehicle restarts after a long period of inactivity, and the total operating time of the fuel cell, the time for the optimized normal purging procedure is determined so that the fuel cell will not freeze again under low-temperature conditions after purging.

7. A vehicle fuel cell purging control system according to claim 6, characterized in that, The real-time environmental parameters include ambient temperature and ambient humidity.

8. A vehicle fuel cell purging control system according to claim 7, characterized in that, The vehicle controller also has a built-in low-temperature open-circuit purging startup purging program, which performs the following steps to complete the fuel cell pre-startup purging function: Identify whether there are start-up obstacles in the fuel cell; If there is a starting obstacle in the fuel cell, the fuel cell will not be started. Instead, the purging actuator will be controlled to execute the start-up purging procedure to purge the fuel cell before starting it. If there are no startup obstacles to the fuel cell, then control the fuel cell to start directly.

9. A vehicle fuel cell purging control system according to claim 8, characterized in that, The startup purging procedure includes high-flow-rate air purging of the fuel cell stack; and, The ventilation flow rate during the start-up purging procedure is 70 g / s. 3 The temperature is greater than or equal to -35℃, and the time taken is... T 3.

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