CN114523849A

CN114523849A - Power-off control method of vehicle, power-off control system of vehicle and vehicle

Info

Publication number: CN114523849A
Application number: CN202210100997.2A
Authority: CN
Inventors: 王家伟; 郭凤刚
Original assignee: Beiqi Foton Motor Co Ltd
Current assignee: Beiqi Foton Motor Co Ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-05-24

Abstract

The invention discloses a power-off control method of a vehicle, a power-off control system of the vehicle and the vehicle, wherein the vehicle comprises a driving system and a fuel cell system, and the power-off control method of the vehicle comprises the following steps: in the power-off process of the vehicle, sending a power stopping output instruction to a driving system, and sending a shutdown instruction to a fuel cell system so that the fuel cell system executes a purging action when receiving the shutdown instruction; and receiving a feedback instruction after the fuel cell system finishes the purging action, and controlling the vehicle to finish powering off according to the feedback instruction. Therefore, the power-off control method can ensure that the fuel cell system is thoroughly purged, can avoid water residue in the fuel cell system, can avoid icing of the fuel cell system, can ensure smooth starting of the fuel cell system, can improve vehicle using experience of a user, and can also avoid dangerous conditions such as vehicle slipping or automatic vehicle running during power-off of a vehicle.

Description

Power-off control method of vehicle, power-off control system of vehicle and vehicle

Technical Field

The present invention relates to the field of vehicles, and in particular, to a power-off control method for a vehicle, a power-off control system for a vehicle, and a vehicle.

Background

In the related art, the fuel cell system needs to be purged after the operation is finished so as to remove water generated during the operation of the fuel cell system, thereby avoiding the icing phenomenon of the fuel cell system in the environment with low temperature and ensuring the smooth start of the fuel cell system.

However, when the driver controls the vehicle to power off through a key or a switch, the vehicle can immediately complete power off, so that the fuel cell system is not thoroughly purged, and in winter or in an environment with a low temperature, residual water in the fuel cell system can be condensed into ice, so that the fuel cell system cannot be smoothly started, and the vehicle using experience of a user is influenced.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a power-off control method for a vehicle, by which a thorough purging of a fuel cell system can be ensured, an icing phenomenon of the fuel cell system can be avoided, the fuel cell system can be ensured to be started smoothly, a vehicle using experience of a user can be improved, and a dangerous situation such as vehicle sliding or vehicle automatic driving during the power-off process of the vehicle can be avoided.

The invention further proposes a computer-readable storage medium.

The invention further provides a vehicle control unit.

The invention further provides a power-off control system of the vehicle.

The invention further provides a vehicle.

According to the power-off control method of a vehicle including a drive system and a fuel cell system of the present invention, the power-off control method of a vehicle includes the steps of: in the power-off process of the vehicle, sending a power stopping output instruction to the driving system and sending a shutdown instruction to the fuel cell system, so that the fuel cell system executes a purging action when receiving the shutdown instruction; and receiving a feedback instruction after the fuel cell system completes the purging action, and controlling the vehicle to complete power-off according to the feedback instruction.

According to the power-off control method of the vehicle, the fuel cell system can be thoroughly purged, water residue in the fuel cell system can be avoided, the icing phenomenon of the fuel cell system can be avoided, the fuel cell system can be ensured to be smoothly started, the vehicle using experience of a user can be improved, and dangerous conditions such as vehicle sliding or vehicle automatic running in the power-off process of the vehicle can be avoided.

In some examples of the present invention, the vehicle further includes a power battery, wherein the vehicle is determined to complete power-down when an electrical connection between the power battery and the drive system, and an electrical connection between the power battery and the fuel cell system are disconnected.

In some examples of the invention, the fuel cell system comprises a purging device and a stack, wherein when the purging device completes purging the stack, the fuel cell system is shut down and the feedback instruction is generated.

In some examples of the invention, the fuel cell system is shut down when a self-test fails, and the feedback instruction is generated.

In some examples of the invention, the fuel cell system comprises a purging device and a stack, when the purging device purges the stack, the fuel cell system determines a purging working time of the purging device, shuts down when the purging working time reaches a first preset time, and generates the feedback instruction.

In some examples of the invention, the sending a stop power output command to the drive system comprises: and sending a zero torque command or a zero rotating speed command to a motor controller in the driving system.

According to the computer-readable storage medium of the present invention, a power-off control program of a vehicle is stored thereon, which when executed by a processor implements the above-described power-off control method of the vehicle.

According to the computer-readable storage medium, the fuel cell system can be thoroughly purged, water residue in the fuel cell system can be avoided, the icing phenomenon of the fuel cell system can be avoided, the fuel cell system can be smoothly started, the vehicle using experience of a user can be improved, and dangerous conditions such as vehicle sliding or vehicle automatic driving in the power-off process of a vehicle can be avoided.

The vehicle control unit comprises a memory, a processor and a vehicle power-off control program which is stored on the memory and can run on the processor, wherein when the processor executes the vehicle power-off control program, the vehicle control unit realizes the vehicle power-off control method.

According to the vehicle control unit, the fuel cell system can be thoroughly purged, water residue in the fuel cell system can be avoided, the icing phenomenon of the fuel cell system can be avoided, the fuel cell system can be smoothly started, the vehicle using experience of a user can be improved, and dangerous conditions such as vehicle sliding or vehicle automatic running in the power-off process of a vehicle can be avoided.

According to the invention, the vehicle comprises a driving system and a fuel cell system, and the power-off control system comprises a vehicle control unit and a fuel cell controller, wherein the vehicle control unit is used for sending a stopping power output instruction to the driving system and sending a shutdown instruction to the fuel cell system in the power-off process of the vehicle; the fuel cell controller is used for controlling the fuel cell system to execute a purging action when the shutdown instruction is received, and sending a feedback instruction to the vehicle control unit after the fuel cell system finishes the purging action; and the vehicle control unit is also used for controlling the vehicle to finish power-off according to the feedback instruction.

According to the power-off control system of the vehicle, the fuel cell system can be thoroughly purged, water residue in the fuel cell system can be avoided, the icing phenomenon of the fuel cell system can be avoided, the fuel cell system can be smoothly started, the vehicle using experience of a user can be improved, and dangerous conditions such as vehicle sliding or vehicle automatic running in the power-off process of the vehicle can be avoided.

The vehicle comprises the power-off control method of the vehicle.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a flow chart of a power down control method according to an embodiment of the present invention;

FIG. 2 is a block schematic diagram of a power down control system according to an embodiment of the present invention;

FIG. 3 is a flow chart of one particular embodiment of a power down control method according to an embodiment of the present invention;

FIG. 4 is a block diagram of a processor, memory, communication interface, communication bus, according to an embodiment of the invention.

Reference numerals:

a vehicle control unit 10; a drive system 20; a motor controller 21;

a fuel cell system 30; a purge device 31; a stack 32;

a fuel cell controller 40;

a processor 1201; a communication interface 1202; a memory 1203; a communication bus 1204.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A power-off control system of a vehicle and a power-off control method of a vehicle according to an embodiment of the invention are described below with reference to fig. 1 and 2.

As shown in fig. 2, the vehicle includes a drive system 20 and a fuel cell system 30, and the power-off control system according to the embodiment of the invention includes: a vehicle control unit 10 and a fuel cell controller 40.

The vehicle control unit 10 is configured to send a stopping power output instruction to the driving system 20 and a shutdown instruction to the fuel cell system 30 in a power-off process of the vehicle, the fuel cell controller 40 is configured to control the fuel cell system 30 to perform a purging action when receiving the shutdown instruction, and send a feedback instruction to the vehicle control unit 10 after the fuel cell system 30 completes the purging action, and the vehicle control unit 10 is further configured to control the vehicle to complete power-off according to the feedback instruction. In the power-OFF process of the vehicle, turning OFF the key to the OFF gear turns OFF the vehicle, and turning OFF the fuel cell system 30 means turning OFF the fuel cell system 30 itself.

It should be noted that the vehicle control unit 10 and the fuel cell controller 40 may be communicatively connected, or the vehicle control unit 10 and the fuel cell controller 40 may be connected by a CAN bus. When the driver turns the key to the OFF gear (i.e., during power-OFF of the vehicle), the vehicle control unit 10 sends a stop power output command to the drive system 20, and the vehicle control unit 10 also sends a shutdown command to the fuel cell system 30.

The driving system 20 may receive a stopping power output command sent by the vehicle control unit 10, and the driving system 20 may stop power output after receiving the stopping power output command. The fuel cell controller 40 may receive a shutdown instruction sent by the vehicle controller 10, and when the fuel cell controller 40 receives the shutdown instruction sent by the vehicle controller 10, the fuel cell controller 40 may control the fuel cell system 30 to perform a purging operation to remove water generated when the fuel cell system 30 operates. After the fuel cell system 30 completes the purging operation, the fuel cell controller 40 may send a feedback instruction to the vehicle controller 10 to feed back the fuel cell system 30 to complete the purging operation to the vehicle controller 10. After receiving the feedback instruction sent by the fuel cell controller 40, the vehicle controller 10 may control the vehicle to complete powering off, so as to complete the powering off process of the vehicle.

In the prior art, the fuel cell system needs to be purged after the operation is finished so as to remove water generated during the operation of the fuel cell system, thereby avoiding the icing phenomenon of the fuel cell system in the environment with lower temperature and ensuring the smooth start of the fuel cell system. However, when the driver controls the vehicle to power off through a key or a switch, the vehicle can immediately complete power off, so that the fuel cell system is not thoroughly purged, and in winter or in an environment with a low temperature, residual water in the fuel cell system can be condensed into ice, so that the fuel cell system cannot be smoothly started, and the vehicle using experience of a user is influenced.

In the present application, when the driver turns the key to the OFF range (i.e., during the power-OFF of the vehicle), the fuel cell controller 40 may control the fuel cell system 30 to perform the purge operation, and after the fuel cell system 30 completes the purge operation, the vehicle controller 10 may control the vehicle to complete the power-OFF. In other words, when the driver turns the key to the OFF position, the vehicle will not be powered OFF immediately, but will wait until the fuel cell system 30 completes the purging action, so as to ensure that the fuel cell system 30 purges thoroughly, avoid the fuel cell system 30 from being frozen, ensure that the fuel cell system 30 can be started smoothly, and improve the vehicle-using experience of the user.

In addition, in the power-off process of the vehicle, the vehicle control unit 10 can send a stop power output instruction to the driving system 20 to control the driving system 20 to stop power output, so that the vehicle can be prevented from slipping, the vehicle can be prevented from automatically running, and the working safety of the power-off control system can be ensured.

From this, through the power-off control system of this application, can guarantee that fuel cell system 30 sweeps thoroughly, can avoid having water to remain in the fuel cell system 30 to can avoid fuel cell system 30 to appear freezing phenomenon, can guarantee that fuel cell system 30 can start smoothly, can improve user's vehicle experience, and, can also avoid the vehicle to take place to roll over the car or dangerous condition such as the vehicle is automatic to be taken place at the in-process of getting off the electricity.

Furthermore, it will be appreciated that with the power down control system of the present application, when the driver turns the key to OFF (i.e., during power down of the vehicle), the driver may leave the vehicle directly, i.e., the driver does not need to wait for the fuel cell system 30 to complete the purge action. Moreover, after the fuel cell system 30 completes the purging operation, the vehicle controller 10 automatically controls the vehicle to complete powering down, so that the situation that the vehicle is not powered down for a long time can be avoided.

In addition, since the vehicle control unit 10 can send a stop power output command to the drive system 20, the vehicle does not slip or run automatically, thereby ensuring the safety of the driver after leaving the vehicle.

During the power-off of the vehicle, the fuel cell system 30 performs only the purge operation, that is, the fuel cell system 30 does not perform any operation except the purge operation.

Alternatively, whether the purge action of the fuel cell system 30 is completed may be determined by detecting the ohmic internal resistance of the fuel cell system 30, for example, the fuel cell controller 40 may be configured to detect the ohmic internal resistance of the fuel cell system 30, and the fuel cell controller 40 may be preset with a threshold internal resistance, and when it is detected that the ohmic internal resistance of the fuel cell system 30 is not less than the threshold internal resistance, it may be determined that the purge action of the fuel cell system 30 is completed.

Alternatively, whether the purge action of the fuel cell system 30 is completed may be determined by detecting a humidity value in the fuel cell system 30, for example, the fuel cell controller 40 may be configured to detect a humidity value in the fuel cell system 30, and the fuel cell controller 40 may be preset with a preset humidity value, and when it is detected that the humidity value of the fuel cell system 30 is not greater than the preset humidity value, it may be determined that the purge action of the fuel cell system 30 is completed.

It should be understood that the above-mentioned case of determining whether the fuel cell system 30 completes the purge operation is only an exemplary description, and does not represent that the present application can only determine whether the fuel cell system 30 completes the purge operation through the above-mentioned manner.

As some embodiments of the present invention, the vehicle may further include a power battery, wherein it may be determined that the vehicle completes powering down when the electrical connection between the power battery and the driving system 20, and the electrical connection between the power battery and the fuel cell system 30 are disconnected.

It should be understood that the power battery may supply power to the driving system 20, and the power battery may supply power to the fuel cell system 30, so that the fuel cell system 30 has electric energy to perform the purging action, and after the purging action of the fuel cell system 30 is completed, the fuel cell controller 40 may send a feedback instruction to the vehicle controller 10 to feed back the purging action of the fuel cell system 30 to the vehicle controller 10. After receiving the feedback command sent by the fuel cell controller 40, the vehicle controller 10 may disconnect the electrical connection between the power battery and the driving system 20 and the electrical connection between the power battery and the fuel cell system 30, so that the vehicle completes the power-off process.

This makes it possible to reliably complete the purge operation of the fuel cell system 30 and to smoothly complete the power-off process of the vehicle.

When the vehicle is not completely powered off, the power battery is electrically connected to all the high-voltage electric devices (including the drive system 20 and the fuel cell system 30). If the electric connection between a certain high-voltage electric appliance and the power battery is disconnected when the vehicle is not powered off, the fault of the high-voltage electric appliance is indicated. Therefore, through the power-off control system, when the vehicle is not powered off, the power battery is electrically connected with all the high-voltage electric devices, and the condition of fault and false alarm can be avoided.

As some embodiments of the present invention, as shown in fig. 2, the fuel cell system 30 may include a purging device 31 and a stack 32, wherein the purging device 31 may purge the stack 32 to remove water from the stack 32, optionally, the purging device 31 may purge the cathode and/or the anode of the stack 32, and of course, the purging device 31 may purge other locations of the stack 32, which is not limited in this application. The electric pile 32 is purged by the purging device 31, so that the icing phenomenon of the electric pile 32 can be avoided, the fuel cell system 30 can be shut down and a feedback instruction can be generated when the purging device 31 finishes purging the electric pile 32, and the fuel cell controller 40 can send the feedback instruction to the vehicle controller 10, so that the vehicle controller 10 controls the vehicle to complete powering down according to the feedback instruction.

From this, can guarantee to sweep device 31 thoroughly to sweeping of galvanic pile 32, can avoid having water to remain on the galvanic pile 32 to can avoid galvanic pile 32 the phenomenon of icing to, after sweeping device 31 and accomplishing the work of sweeping of galvanic pile 32, fuel cell system 30 can shut down rapidly and generate feedback instruction, thereby can make the vehicle accomplish down the electricity rapidly.

Alternatively, the purging device 31 may be a blower, or the purging device 31 may also be a fan, which is not limited in this application.

As some embodiments of the present invention, the fuel cell system 30 may perform a self-test, alternatively, the fuel cell system 30 may perform a self-test at predetermined intervals, and when the fuel cell system 30 finds a failure by the self-test, the fuel cell system 30 may perform a shutdown and generate a feedback instruction. Therefore, when the self-test of the fuel cell system 30 fails, the vehicle controller 10 may control the vehicle to complete power-off according to the feedback instruction, so as to avoid aggravation of the failure.

As some embodiments of the present invention, as shown in fig. 2, the fuel cell system 30 may include a purging device 31 and a stack 32, wherein the purging device 31 may purge the stack 32 to remove water from the stack 32, optionally, the purging device 31 may purge the cathode and/or the anode of the stack 32, and of course, the purging device 31 may purge other locations of the stack 32, which is not limited in this application.

Moreover, when the purging device 31 purges the stack 32, the fuel cell system 30 may determine the purging operation time of the purging device 31, and when the purging operation time of the purging device 31 reaches the first preset time, the fuel cell system 30 may shut down and generate a feedback instruction, so that the vehicle controller 10 controls the vehicle to complete powering off according to the feedback instruction. Alternatively, the first preset time may be preset to ten minutes. Therefore, the purging working time of the purging device 31 can be reasonable, the purging device 31 can be prevented from purging the galvanic pile 32 for a long time, the situation that the galvanic pile 32 is damaged due to the fact that the purging device 31 purges the galvanic pile 32 for a long time can be avoided, and the use reliability of the power-off control system can be guaranteed.

As some embodiments of the invention, sending a stop power output command to drive system 20 may include: a zero torque command or a zero rotational speed command is sent to the motor controller 21 in the drive system 20.

Alternatively, the hybrid controller 10 may stop the power output of the drive system 20 by sending a zero torque command to the motor controller 21 in the drive system 20. Alternatively, the hybrid controller 10 may stop the power output of the drive system 20 by sending a zero rpm command to the motor controller 21 in the drive system 20. Therefore, the driving system 20 can be ensured to be always in unpowered output in the power-off process of the vehicle, so that the dangerous situation caused by the power output of the driving system 20 in the power-off process of the vehicle can be avoided, and the use safety of the power-off control system can be ensured.

It can be understood that the power-off control system can be realized by only utilizing the existing parts of the vehicle, and does not need to carry out a great deal of part change on the vehicle, thereby being convenient to be applied to the vehicle.

Fig. 1 is a flowchart of a power-down control method according to an embodiment of the present invention, which can be implemented by the power-down control system of the above-mentioned embodiment, as shown in fig. 1, the power-down control method includes the following steps:

and S1, sending a stopping power output instruction to the driving system and sending a shutdown instruction to the fuel cell system during the power-off process of the vehicle, so that the fuel cell system executes a purging action when receiving the shutdown instruction.

And S2, receiving a feedback instruction after the fuel cell system completes the purging action, and controlling the vehicle to complete power-off according to the feedback instruction.

It should be noted that, during the power-OFF process of the vehicle, turning the key to the OFF gear to shut down the vehicle, and shutting down the fuel cell system means shutting down the fuel cell system itself. The vehicle includes a drive system and a fuel cell system, and the power-off control system includes: the system comprises a vehicle control unit and a fuel cell controller, and the power-off control system is the power-off control system.

The vehicle control unit and the fuel cell controller CAN be in communication connection, or the vehicle control unit and the fuel cell controller CAN also be connected through a CAN bus. When the driver turns the key to the OFF gear (i.e., during the power-OFF of the vehicle), the vehicle control unit sends a power-OFF instruction to the drive system, and the vehicle control unit also sends a shutdown instruction to the fuel cell system.

The driving system can receive a stopping power output instruction sent by the vehicle control unit, and the driving system can stop power output after receiving the stopping power output instruction. The fuel cell controller can receive a shutdown instruction sent by the vehicle controller, and when the fuel cell controller receives the shutdown instruction sent by the vehicle controller, the fuel cell controller can control the fuel cell system to perform purging action so as to clear water generated when the fuel cell system works. After the fuel cell system completes the purging action, the fuel cell controller may send a feedback instruction to the vehicle controller to feed back the fuel cell system to complete the purging action to the vehicle controller. And after receiving the feedback instruction sent by the fuel cell controller, the vehicle controller can control the vehicle to finish powering off so as to finish the powering off process of the vehicle.

In the present application, when the driver turns the key to the OFF-range (i.e., during the power-OFF process of the vehicle), the fuel cell controller may control the fuel cell system to perform the purging action, and after the fuel cell system completes the purging action, the vehicle controller may control the vehicle to complete the power-OFF process. In other words, when the driver turns the key to the OFF gear, the vehicle cannot be immediately powered OFF, but can wait for powering OFF after the fuel cell system finishes the purging action, so that the fuel cell system can be purged thoroughly, the icing phenomenon of the fuel cell system can be avoided, the fuel cell system can be started smoothly, and the vehicle using experience of a user can be improved.

In addition, in the power-off process of the vehicle, the vehicle control unit can send a stopping power output instruction to the driving system to control the driving system to stop power output, so that the vehicle can be prevented from slipping, the vehicle can be prevented from automatically running, and the use safety of the power-off control method can be ensured.

Therefore, the power-off control method can ensure that the fuel cell system is thoroughly purged and can avoid water residue in the fuel cell system, so that the icing phenomenon of the fuel cell system can be avoided, the fuel cell system can be ensured to be smoothly started, the vehicle using experience of a user can be improved, and the dangerous conditions that the vehicle slides or the vehicle automatically runs and the like in the power-off process can be avoided.

Furthermore, it can be understood that with the power-down control method of the present application, when the driver turns the key to the OFF-range (i.e., during power-down of the vehicle), the driver can leave the vehicle directly, i.e., the driver does not need to wait for the fuel cell system to complete the purge action. And after the fuel cell system finishes the purging action, the vehicle controller can automatically control the vehicle to finish powering off, so that the condition that the vehicle is not powered off for a long time can be avoided.

In addition, the vehicle control unit can send a stopping power output command to the driving system, so that the vehicle cannot slide or automatically run and other dangerous conditions, and the safety of the driver after leaving the vehicle is ensured.

During the power-off of the vehicle, the fuel cell system performs only the purge operation, that is, the fuel cell system does not perform any operation other than the purge operation.

Alternatively, whether the purging action of the fuel cell system is completed may be determined by detecting the ohmic internal resistance of the fuel cell system, for example, the fuel cell controller may be configured to detect the ohmic internal resistance of the fuel cell system, and the fuel cell controller may be preset with a threshold internal resistance, and when it is detected that the ohmic internal resistance of the fuel cell system is not less than the threshold internal resistance, it may be determined that the purging action of the fuel cell system is completed.

Alternatively, whether the purge action of the fuel cell system is completed may be determined by detecting a humidity value in the fuel cell system, for example, the fuel cell controller may be configured to detect a humidity value in the fuel cell system, and the fuel cell controller may be preset with a preset humidity value, and when it is detected that the humidity value of the fuel cell system is not greater than the preset humidity value, it may be determined that the purge action of the fuel cell system is completed.

It should be understood that the above-mentioned case of determining whether the fuel cell system completes the purge operation is only an exemplary description, and does not represent that the present application can only determine whether the fuel cell system completes the purge operation through the above-mentioned manner.

In some embodiments of the invention, the vehicle may further comprise a power battery, wherein the vehicle may be determined to complete the power-down when the electrical connection between the power battery and the driving system, the electrical connection between the power battery and the fuel cell system is disconnected.

It should be understood that the power battery may supply power to the driving system, and the power battery may supply power to the fuel cell system, so that the fuel cell system has electric energy to perform the purging action. After receiving the feedback instruction sent by the fuel cell controller, the vehicle controller can disconnect the electric connection between the power cell and the driving system and the electric connection between the power cell and the fuel cell system, so that the vehicle finishes the power-off process.

Therefore, the fuel cell system can reliably complete the purging action, and the vehicle can smoothly complete the power-off process.

When the vehicle is not powered off, the power battery is electrically connected with all the high-voltage electric devices (including the driving system and the fuel cell system). If the electric connection between a certain high-voltage electric appliance and the power battery is disconnected when the vehicle is not powered off, the fault of the high-voltage electric appliance is indicated. Therefore, by the power-off control method, when the vehicle is not powered off, the power battery is electrically connected with all the high-voltage electric devices, and the condition of fault and false alarm can be avoided.

In some embodiments of the present invention, the fuel cell system may include a purging device and a stack, wherein the purging device may purge the stack to remove water from the stack, optionally, the purging device may purge the cathode and/or the anode of the stack, and of course, the purging device may purge other locations of the stack, which is not limited in this application. The electric pile is blown and swept by the blowing and sweeping device, the icing phenomenon of the electric pile can be avoided, the fuel cell system can be shut down when the blowing and sweeping device finishes blowing and sweeping the electric pile, a feedback instruction is generated, and the fuel cell controller can send the feedback instruction to the vehicle control unit so that the vehicle control unit can control the vehicle to finish powering down according to the feedback instruction.

From this, can guarantee to sweep the device and sweep thoroughly to the pile, can avoid having water to remain on the pile to can avoid the pile to appear icing phenomenon, and, after the device that sweeps accomplishes the work of sweeping to the pile, fuel cell system can shut down rapidly and generate feedback instruction, thereby can make the vehicle accomplish fast and descend the electricity.

Optionally, the purging device may be a blower, or the purging device may also be a fan, which is not limited in this application.

In some embodiments of the present invention, the fuel cell system may perform a self-test, alternatively, the fuel cell system may perform a self-test every predetermined time, and when the fuel cell system finds a failure through the self-test, the fuel cell system may perform a shutdown and generate a feedback instruction. Therefore, when the self-checking of the fuel cell system fails, the vehicle controller can control the vehicle to finish power-off according to the feedback instruction, so that the aggravation of the failure can be avoided.

In some embodiments of the present invention, the fuel cell system may include a purging device and a stack, wherein the purging device may purge the stack to remove water from the stack, optionally, the purging device may purge the cathode and/or the anode of the stack, and of course, the purging device may purge other locations of the stack, which is not limited in this application.

And when the purging device purges the electric pile, the fuel cell system can determine the purging working time of the purging device, and when the purging working time of the purging device reaches a first preset time, the fuel cell system can be shut down and generate a feedback instruction so that the vehicle controller controls the vehicle to finish powering off according to the feedback instruction. Alternatively, the first preset time may be preset to ten minutes. Therefore, the purging working time of the purging device is reasonable, the purging device can be prevented from purging the electric pile for a long time, the condition that the electric pile is damaged due to the fact that the purging device purges the electric pile for a long time can be avoided, and the reliability of the electric control method can be guaranteed.

In some embodiments of the invention, sending a stop power output command to the drive system may comprise: a zero torque command or a zero rotational speed command is sent to a motor controller in the drive system.

Alternatively, the vehicle control unit may stop the power output of the drive system by sending a zero torque command to a motor controller in the drive system. Alternatively, the vehicle control unit may stop the power output of the drive system by sending a zero rotation speed command to a motor controller in the drive system. Therefore, the driving system can be ensured to be always in unpowered output in the power-off process of the vehicle, so that the dangerous situation caused by the output power of the driving system in the power-off process of the vehicle can be avoided, and the use safety of the power-off control method can be ensured.

It can be understood that the power-off control method can be realized only by using the existing parts of the vehicle, and does not need to change a large number of parts of the vehicle, so that the method can be conveniently applied to the vehicle.

Specifically, as shown in fig. 3, as an embodiment of the present invention, the power-off control method may include the following steps:

s01, sending a power output stopping instruction to the driving system and sending a shutdown instruction to the fuel cell system;

s02, receiving a shutdown instruction, and executing a purging action;

s03, shutting down after the purging action is finished, and generating a feedback instruction;

s04, shutting down when the self-checking fails and generating a feedback instruction;

s05; when the purging working time reaches a first preset time, shutting down the device and generating a feedback instruction;

and S06, receiving a feedback instruction of the fuel cell system, disconnecting the electric connection between the power cell and the driving system and the electric connection between the power cell and the fuel cell system, and completing the power-off process of the vehicle.

After step S02, if any one of step S03, step S04 and step S05 occurs, the process proceeds to step S06 to complete the vehicle power-off process.

In order to achieve the above-described embodiments, the present invention proposes a computer-readable storage medium having stored thereon a power-off control program of a vehicle, which, when executed by a processor, can implement the power-off control method of the above-described embodiments.

According to the computer-readable storage medium provided by the embodiment of the invention, the fuel cell system can be ensured to be thoroughly purged, and water residue in the fuel cell system can be avoided, so that the icing phenomenon of the fuel cell system can be avoided, the fuel cell system can be ensured to be smoothly started, the vehicle using experience of a user can be improved, and dangerous situations such as vehicle sliding or automatic vehicle running can be avoided.

In order to implement the above embodiments, the present invention further provides a vehicle control unit, where the vehicle control unit includes a memory, a processor, and a vehicle power-off control program stored in the memory and operable on the processor, and when the processor executes the power-off control program, the vehicle control unit may implement the power-off control method of the above embodiments.

According to the vehicle control unit provided by the embodiment of the invention, the fuel cell system can be ensured to be thoroughly purged, water residue in the fuel cell system can be avoided, so that the icing phenomenon of the fuel cell system can be avoided, the fuel cell system can be ensured to be smoothly started, the vehicle using experience of a user can be improved, and dangerous situations such as vehicle sliding or automatic vehicle running can be avoided.

As shown in fig. 4, the vehicle control unit may include at least one processor 1201, at least one communication interface 1202, at least one memory 1203, and at least one communication bus 1204. In the embodiment of the present invention, the number of the processor 1201, the communication interface 1202, the memory 1203 and the communication bus 1204 is at least one, and the processor 1201, the communication interface 1202 and the memory 1203 complete communication with each other through the communication bus 1204.

The Memory 1203 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 1203 is configured to store a program, and the processor 1201 executes the program after receiving an execution instruction, so as to implement the steps of the power down control method described in the foregoing embodiment.

The processor 1201 may be an integrated circuit chip having signal processing capabilities. The processor may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

According to the vehicle provided by the embodiment of the invention, the power-off control method can be applied to the vehicle, and through the power-off control method, the fuel cell system can be ensured to be thoroughly purged, water residue in the fuel cell system can be avoided, so that the icing phenomenon of the fuel cell system can be avoided, the fuel cell system can be ensured to be smoothly started, the vehicle using experience of a user can be improved, and dangerous conditions such as vehicle sliding or vehicle automatic running can be avoided.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more.

In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.

In the description of the invention, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

Other configurations of …, such as … and …, etc., and operations according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A power-off control method of a vehicle, characterized in that the vehicle includes a drive system and a fuel cell system, the method comprising the steps of:

in the power-off process of the vehicle, sending a power stopping output instruction to the driving system and sending a shutdown instruction to the fuel cell system, so that the fuel cell system executes a purging action when receiving the shutdown instruction;

and receiving a feedback instruction after the fuel cell system completes the purging action, and controlling the vehicle to complete power-off according to the feedback instruction.

2. The power-off control method according to claim 1, wherein the vehicle further includes a power battery, wherein it is determined that the vehicle completes power-off when an electrical connection between the power battery and the drive system, and an electrical connection between the power battery and the fuel cell system are disconnected.

3. The power-off control method according to claim 1, wherein the fuel cell system comprises a purge device and a stack, wherein when the purge device completes purge operation of the stack, the fuel cell system is shut down and the feedback command is generated.

4. The power-off control method according to claim 1, wherein the fuel cell system is shut down when a self-test fails, and the feedback command is generated.

5. The power down control method according to claim 1, wherein the fuel cell system includes a purge device and a stack, the fuel cell system determines a purge operation time of the purge device when the purge device purges the stack, and shuts down when the purge operation time reaches a first preset time, and generates the feedback command.

6. The power-down control method according to any one of claims 1-5, wherein the sending a stop power output command to a drive system includes:

and sending a zero torque command or a zero rotating speed command to a motor controller in the driving system.

7. A computer-readable storage medium, characterized in that a power-off control program of a vehicle is stored thereon, which when executed by a processor implements the power-off control method of the vehicle according to any one of claims 1 to 6.

8. A vehicle control unit, characterized by comprising a memory, a processor and a vehicle power-off control program stored on the memory and operable on the processor, wherein the processor implements the vehicle power-off control method according to any one of claims 1-6 when executing the vehicle power-off control program.

9. A power-down control system of a vehicle, characterized in that the vehicle includes a drive system (20) and a fuel cell system (30), the power-down control system including a vehicle control unit (10) and a fuel cell controller (40), wherein,

the vehicle control unit (10) is used for sending a power stopping output command to the driving system (20) and sending a shutdown command to the fuel cell system (30) in the power-off process of the vehicle;

the fuel cell controller (40) is used for controlling the fuel cell system (30) to perform a purging action when the shutdown instruction is received, and sending a feedback instruction to the vehicle control unit (10) after the fuel cell system (30) completes the purging action;

the vehicle control unit (10) is further used for controlling the vehicle to complete power-off according to the feedback instruction.

10. A vehicle characterized by comprising a power-off control method according to any one of claims 1-6.