A new energy vehicle p gear control method and device

Abstract

This application provides a method and apparatus for controlling the Parking (P) gear in a new energy vehicle. The method includes: upon receiving a high-voltage power-down command, acquiring the motion state of the new energy vehicle; if the motion state of the new energy vehicle meets preset conditions, generating a low-voltage holding signal and a Parking (P) gear request signal; sending the Parking (P) gear request signal to the electronic parking brake system; determining whether the low-voltage holding signal is valid; and if the low-voltage holding signal is valid, controlling a high-voltage accessory to continue supplying power to the electronic parking brake system, so that the electronic parking brake system performs Parking (P) gear operation based on the Parking (P) gear request signal. This application, by generating a low-voltage holding signal after recognizing a high-voltage power-down command to delay the shutdown of the high-voltage accessory, allows the high-voltage accessory to continue supplying power to the electronic parking brake system to perform Parking (P) gear operation, thereby avoiding the situation in the prior art where Parking (P) gear operation cannot be performed, and ensuring driving safety.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle design, and in particular to a method and device for controlling the P gear of a new energy vehicle. Background Technology

[0002] Modern new energy vehicles are becoming increasingly intelligent and feature-rich. For example, they can automatically engage Park (P) gear after the driver opens the door to exit the vehicle or after the vehicle is IG-OFF, to prevent the vehicle from rolling away if the driver forgets to engage Park.

[0003] However, in the existing design of automatic P gear control, when the vehicle is READY (high voltage connection state), the control of the vehicle IG-OFF requires the P gear controller (such as the Electronic Parking Brake EPB system), which was originally powered by a high voltage power source (such as the power battery), to switch to battery power to automatically execute the P gear operation. If the battery has an undervoltage fault and cannot supply power normally, the P gear cannot be automatically executed, which poses a risk of the vehicle rolling and increases the safety hazards of driving.

[0004] In view of this, this application is hereby filed. Summary of the Invention

[0005] This application provides a method for controlling the P gear in a new energy vehicle, which solves the technical problem in the prior art that new energy vehicles may not be able to automatically execute the P gear control after the high voltage is cut off.

[0006] According to a first aspect of this application, a P-gear control method for a new energy vehicle is provided, applied to a vehicle controller. The method includes: upon receiving a high-voltage power-down command, acquiring the motion state of the new energy vehicle; if the motion state of the new energy vehicle meets preset conditions, generating a low-voltage holding signal and a P-gear request signal; sending the P-gear request signal to an electronic parking brake system; determining whether the low-voltage holding signal is a valid signal; and if the low-voltage holding signal is a valid signal, controlling a high-voltage accessory to continue supplying power to the electronic parking brake system, so that the electronic parking brake system performs P-gear operation based on the P-gear request signal.

[0007] Optionally, determining whether the low-voltage holding signal is a valid signal includes: if a feedback signal indicating that the P gear has been executed is obtained within a preset time or if no feedback signal is obtained after the preset time has expired, determining that the low-voltage holding signal is an invalid signal; if no feedback signal indicating that the P gear has been executed is obtained within a preset time, determining that the low-voltage holding signal is a valid signal.

[0008] Optionally, the motion state includes the vehicle speed of the new energy vehicle, and generating a low-voltage hold signal and a P gear request signal when the motion state of the new energy vehicle meets preset conditions includes: generating a low-voltage hold signal and a P gear request signal when the vehicle speed of the new energy vehicle is below a preset value.

[0009] Optionally, the preset time is the longest response time for the electronic parking brake system to execute the P gear operation.

[0010] Optionally, the method further includes: when the low-voltage holding signal is invalid, controlling the high-voltage accessory to shut down, so as to stop the high-voltage accessory from supplying power to the electronic parking brake system.

[0011] According to a second aspect of the present invention, a P-gear control device for a new energy vehicle is provided, applied to a vehicle controller, comprising: an acquisition module for acquiring the motion state of the new energy vehicle upon receiving a high-voltage power-down command; a generation module for generating a low-voltage holding signal and a P-gear request signal when the motion state of the new energy vehicle meets preset conditions; a sending module for sending the P-gear request signal to an electronic parking brake system; a judgment module for judging whether the low-voltage holding signal is a valid signal; and a control module for controlling a high-voltage accessory to continue supplying power to the electronic parking brake system when the low-voltage holding signal is a valid signal, so that the electronic parking brake system performs P-gear operation based on the P-gear request signal.

[0012] Optionally, determining whether the low-voltage holding signal is a valid signal includes: if a feedback signal indicating that the P gear has been executed is obtained within a preset time or if no feedback signal is obtained after the preset time has expired, determining that the low-voltage holding signal is an invalid signal; if no feedback signal indicating that the P gear has been executed is obtained within a preset time, determining that the low-voltage holding signal is a valid signal.

[0013] Optionally, the generation module is used to generate a low-voltage holding signal and a P-gear request signal when the speed of the new energy vehicle is below a preset value.

[0014] Optionally, the preset time is the longest response time for the electronic parking brake system to execute the P gear operation.

[0015] Optionally, if the low-voltage holding signal is invalid, the high-voltage accessory is controlled to shut down to stop the high-voltage accessory from supplying power to the electronic parking brake system.

[0016] According to a third aspect of the present invention, a vehicle controller for a new energy vehicle is provided, comprising a power-on / off software module and the aforementioned P-gear control device, wherein the power-on / off software module is used to acquire a high-voltage power-off command and control the shutdown of the high-voltage accessory based on the high-voltage power-off command.

[0017] According to a fourth aspect of the present invention, a new energy vehicle is provided, comprising a power battery and a battery management system, a high-voltage accessory, an electronic parking brake system, a storage battery, and the aforementioned vehicle controller; the power battery and battery management system are used to supply power to the electronic parking brake system and the vehicle controller respectively after being transformed by the high-voltage accessory, and to charge the storage battery; the storage battery is used to supply power to the vehicle controller and the electronic parking brake system after the high voltage is de-energized; the vehicle controller is communicatively connected to the power battery and battery management system and the electronic parking brake system respectively, and is used to send control commands to the power battery and battery management system to control the high-voltage accessory to open or close, and to send control commands to the electronic parking brake system to execute P gear operation.

[0018] According to a fifth aspect of the present invention, an electronic device is provided, the electronic device comprising: a processor and a memory storing computer program instructions; wherein the processor, when executing the computer program instructions, implements the P-gear control method for a new energy vehicle as described above.

[0019] According to a sixth aspect of the present invention, a computer-readable storage medium is provided, wherein computer program instructions are stored thereon, and when executed by a processor, the computer program instructions implement the P-gear control method for a new energy vehicle as described above.

[0020] In summary, the P-gear control method and device for new energy vehicles provided in this application have at least the following beneficial effects:

[0021] This application provides a method and device for controlling the Parking (P) gear in a new energy vehicle. The method includes: acquiring the motion state of the new energy vehicle upon receiving a high-voltage power-down command; generating a low-voltage holding signal and a Parking (P) gear request signal if the motion state of the new energy vehicle meets preset conditions; sending the Parking (P) gear request signal to the electronic parking brake system; determining whether the low-voltage holding signal is valid; and controlling a high-voltage accessory to continue supplying power to the electronic parking brake system if the low-voltage holding signal is valid, so that the electronic parking brake system performs Parking (P) gear operation based on the Parking (P) gear request signal. By generating a low-voltage holding signal after recognizing a high-voltage power-down command, the vehicle controller's Parking (P) gear control device prevents the vehicle controller from executing the high-voltage power-down command and shutting down the high-voltage accessory. This allows the high-voltage accessory to continue supplying power to the electronic parking brake system to perform Parking (P) gear operation, thus avoiding the situation in the prior art where Parking (P) operation cannot be performed due to battery undervoltage or other faults, ensuring driving safety. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A flowchart of a P-gear control method for a new energy vehicle provided as an embodiment of this application;

[0024] Figure 2 A structural diagram of a P-gear control device for a new energy vehicle provided as an embodiment of this application;

[0025] Figure 3 A structural diagram of a system for performing P-level control is provided for embodiments of this application;

[0026] Figure 4 This is a structural diagram of an electronic device provided as an embodiment of the present application.

[0027] The attached figures are labeled as follows:

[0028] 1. Power battery and battery management system; 2. DC / DC converter; 3. Storage battery; 4. Vehicle controller; 41. Power-on / off software module; 42. P gear control device; 43. Low voltage holding signal; 5. CAN bus; 6. Electronic parking brake system. Detailed Implementation

[0029] To make the above and other features and advantages of this application clearer, the application is further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art, and are exemplary only, not restrictive.

[0030] In the following description, numerous specific details are set forth to provide a thorough understanding of this application. However, it will be apparent to those skilled in the art that the specific details are not required to practice this application. In other instances, well-known steps or operations have not been described in detail to avoid obscuring this application.

[0031] The P-gear control method for new energy vehicles provided in this application embodiment can be executed by the P-gear control device for new energy vehicles provided in this application embodiment, and the device can be configured in an electronic device.

[0032] Please see Figure 1 As shown, this application provides a P-gear control method for new energy vehicles, applied to the vehicle controller. The method includes:

[0033] S100 acquires the motion status of the new energy vehicle upon receiving a high-voltage power-down command.

[0034] Specifically, the executing entity of this application can be the P-gear control device in the vehicle controller. In this application, the high-voltage power-down command refers to the command to disconnect the power supply to the power battery. This high-voltage power-down command can be triggered by a switch on the new energy vehicle or by opening a door. Furthermore, the motion status of the new energy vehicle should at least include vehicle speed information.

[0035] S200 generates a low-voltage holding signal and a P-gear request signal when the motion state of the new energy vehicle meets preset conditions.

[0036] Specifically, since the P-gear controller works by mechanically locking the vehicle's transmission system to achieve parking, to prevent damage to vehicle components from the mechanical device being activated during high-speed movement, the P-gear control device, after recognizing the high-voltage power-down command, further needs to determine whether the vehicle's speed is below a preset value. In some embodiments, the preset value can be 0. Furthermore, the low-voltage holding signal prevents the vehicle controller from sending a shutdown command to high-voltage accessories (such as a DC / DC converter), allowing the DC / DC converter to reduce the high voltage of the power battery to supply power to the electronic parking brake system. The P-gear request signal is used to control the electronic parking brake system to execute the P-gear operation.

[0037] S300 sends a P gear request signal to the electronic parking brake system.

[0038] Specifically, the P gear control device can send a P gear request signal to the electronic parking brake system to control the electronic parking brake system to perform P gear operation.

[0039] S400 determines whether the low-voltage holding signal is valid.

[0040] Specifically, after generating the low-pressure holding signal and sending the P-gear request signal to the electronic parking brake system, the P-gear control device can determine whether the low-pressure holding signal is valid or whether to cancel the low-pressure holding signal based on the feedback signal from the electronic parking brake system.

[0041] S500, when the low-voltage holding signal is valid, controls the high-voltage accessory to continue supplying power to the electronic parking brake system so that the electronic parking brake system can perform P gear operation based on the P gear request signal.

[0042] Specifically, in this application, the P-gear control device defaults to determining that the low-pressure holding signal is valid when it is generated. That is, after the P-gear control device recognizes the high-voltage power-down command, it generates a valid low-pressure holding signal to prevent the vehicle controller from executing the high-voltage power-down command and shuts down the high-voltage accessory (DC / DC converter). This allows the high-voltage accessory to continue supplying power to the electronic parking brake system, which then executes the P-gear operation based on the P-gear request signal. Furthermore, to prevent damage to the high-voltage accessory due to prolonged inactivity of the high-voltage power-down command, the P-gear control device can determine whether the low-pressure holding signal is invalid or cancel the low-pressure holding signal based on feedback signals from the electronic parking brake system, thereby shutting down the high-voltage accessory.

[0043] In summary, by generating a low-voltage holding signal after recognizing a high-voltage power-down command, the vehicle controller's P-gear control device prevents the vehicle controller from executing the high-voltage power-down command and shutting down the high-voltage accessories. This allows the high-voltage accessories to continue supplying power to the electronic parking brake system, enabling it to perform P-gear operation. This avoids the situation in existing technologies where the vehicle controller shuts down the high-voltage accessories upon recognizing a high-voltage power-down command, and the battery powers the electronic parking brake system. If the battery experiences an undervoltage fault, the P-gear operation cannot be performed, thus ensuring driving safety.

[0044] In some embodiments of this application, determining whether the low-voltage holding signal is a valid signal includes: if a feedback signal indicating that the P-level has been executed is obtained within a preset time or if no feedback signal is obtained after the preset time has expired, determining that the low-voltage holding signal is an invalid signal; if no feedback signal indicating that the P-level has been executed is obtained within a preset time, determining that the low-voltage holding signal is a valid signal.

[0045] Specifically, to prevent damage to high-voltage accessories due to prolonged inactivity of the high-voltage power-down command, the applicant sets a time threshold (preset time) for the effective low-voltage holding signal's duration. Thus, if the vehicle controller receives a feedback signal indicating that P-gear operation has been executed within the preset time, or if no feedback signal is received after the preset time, the low-voltage holding signal can be determined to be invalid or canceled, thereby shutting down the high-voltage accessories based on the high-voltage power-down command. In some embodiments, the preset time can be the longest response time for the electronic parking brake system to execute P-gear operation, such as 5 seconds.

[0046] Please see Figure 2 As shown, a P-gear control device for a new energy vehicle is provided, applied to the vehicle controller, including:

[0047] The acquisition module 201 is used to acquire the motion status of the new energy vehicle when a high-voltage power-down command is received.

[0048] Specifically, the executing entity of this application can be the P-gear control device in the vehicle controller. In this application, the high-voltage power-down command refers to the command to disconnect the power supply to the power battery. This high-voltage power-down command can be triggered by a switch on the new energy vehicle or by opening a door. Furthermore, the motion status of the new energy vehicle should at least include vehicle speed information.

[0049] The generation module 202 is used to generate a low-voltage holding signal and a P gear request signal when the motion state of the new energy vehicle meets preset conditions.

[0050] Specifically, since the P-gear controller works by mechanically locking the vehicle's transmission system to achieve parking, to prevent damage to vehicle components from the mechanical device being activated during high-speed movement, the P-gear control device, after recognizing the high-voltage power-down command, further needs to determine whether the vehicle's speed is below a preset value. In some embodiments, the preset value can be 0. Furthermore, the low-voltage holding signal prevents the vehicle controller from sending a shutdown command to high-voltage accessories (such as a DC / DC converter), allowing the DC / DC converter to reduce the high voltage of the power battery to supply power to the electronic parking brake system. The P-gear request signal is used to control the electronic parking brake system to execute the P-gear operation.

[0051] The sending module 203 is used to send the P gear request signal to the electronic parking brake system.

[0052] Specifically, the P gear control device can send a P gear request signal to the electronic parking brake system to control the electronic parking brake system to perform P gear operation.

[0053] The judgment module 204 is used to determine whether the low-voltage holding signal is a valid signal.

[0054] Specifically, after generating the low-pressure holding signal and sending the P-gear request signal to the electronic parking brake system, the P-gear control device can determine whether the low-pressure holding signal is valid or whether to cancel the low-pressure holding signal based on the feedback signal from the electronic parking brake system.

[0055] The control module 205 is used to control the high-voltage accessory to continue supplying power to the electronic parking brake system when the low-voltage holding signal is a valid signal, so that the electronic parking brake system can perform P gear operation based on the P gear request signal.

[0056] Specifically, in this application, the P-gear control device defaults to determining that the low-pressure holding signal is valid when it is generated. That is, after the P-gear control device recognizes the high-voltage power-down command, it generates a valid low-pressure holding signal to prevent the vehicle controller from executing the high-voltage power-down command and shuts down the high-voltage accessory (DC / DC converter). This allows the high-voltage accessory to continue supplying power to the electronic parking brake system, which then executes the P-gear operation based on the P-gear request signal. Furthermore, to prevent damage to the high-voltage accessory due to prolonged inactivity of the high-voltage power-down command, the P-gear control device can determine whether the low-pressure holding signal is invalid or cancel the low-pressure holding signal based on feedback signals from the electronic parking brake system, thereby shutting down the high-voltage accessory.

[0057] In some embodiments of this application, determining whether the low-voltage holding signal is a valid signal includes: if a feedback signal indicating that the P-level has been executed is obtained within a preset time or if no feedback signal is obtained after the preset time has expired, determining that the low-voltage holding signal is an invalid signal; if no feedback signal indicating that the P-level has been executed is obtained within a preset time, determining that the low-voltage holding signal is a valid signal.

[0058] Specifically, to prevent damage to high-voltage accessories due to prolonged inactivity of the high-voltage power-down command, the applicant sets a time threshold (preset time) for the effective low-voltage holding signal's duration. Thus, if the vehicle controller receives a feedback signal indicating that P-gear operation has been executed within the preset time, or if no feedback signal is received after the preset time, the low-voltage holding signal can be determined to be invalid or canceled, thereby shutting down the high-voltage accessories based on the high-voltage power-down command. In some embodiments, the preset time can be the longest response time for the electronic parking brake system to execute P-gear operation, such as 5 seconds.

[0059] In summary, by generating a low-voltage holding signal after recognizing a high-voltage power-down command, the vehicle controller's P-gear control device prevents the vehicle controller from executing the high-voltage power-down command and shutting down the high-voltage accessories. This allows the high-voltage accessories to continue supplying power to the electronic parking brake system, enabling it to perform P-gear operation. This avoids the situation in existing technologies where the vehicle controller shuts down the high-voltage accessories upon recognizing a high-voltage power-down command, and the battery powers the electronic parking brake system. If the battery experiences an undervoltage fault, the P-gear operation cannot be performed, thus ensuring driving safety.

[0060] This application provides a vehicle controller for a new energy vehicle, including a power-on / off software module and the aforementioned P-gear control device. The power-on / off software module is used to acquire a high-voltage power-off command and control the shutdown of high-voltage accessories based on the high-voltage power-off command.

[0061] Please participate Figure 3 As shown, this application provides a new energy vehicle, including a power battery and battery management system, high-voltage accessories, electronic parking brake system, storage battery, and the aforementioned vehicle controller;

[0062] The power battery and battery management system are used to supply power to the electronic parking brake system and the vehicle controller after being transformed by the high-voltage accessory, and to charge the battery.

[0063] The battery is used to supply power to the vehicle controller and electronic parking brake system after the high voltage is turned off;

[0064] The vehicle controller is communicatively connected to the power battery and battery management system and the electronic parking brake system, respectively. It is used to send control commands to the power battery and battery management system to control the opening or closing of high-voltage accessories, and to send control commands to the electronic parking brake system to execute the P gear operation.

[0065] Please participate Figure 3As shown in a specific embodiment of this application, the vehicle user can trigger a high-voltage power-off command by operating the one-button start switch to IG-OFF. After recognizing the high-voltage power-off command, the P-gear control device 42 of the vehicle controller 4 will generate a low-voltage holding signal 43 and a P-gear request signal based on certain conditions (such as vehicle speed being 0). After the P-gear control device 42 generates the above signals, it can send the P-gear request signal to the electronic parking brake system 6 via the CAN bus 5, so that the electronic parking brake system 6 can perform P-gear operation. At the same time, the P-gear control device 42 can also send a valid low-voltage holding signal to the power-on / off software module 41, so that the power-on / off software module 41 can delay sending the control command to shut down the high-voltage accessory (DC / DC converter 2) to the power battery and battery management system 1. Furthermore, during the execution of P-gear operation, the electronic parking brake system 6 will send a feedback signal to the P-gear control device 42 in real time via the CAN bus 5 to indicate whether the P-gear operation was successful. The low-pressure holding signal is valid for a maximum of 5 seconds (calibrated value). If the electronic parking brake system 6 sends a successful P-gear engagement signal to the P-gear control device 42, or if the P-gear control device 42 does not receive such a signal within 5 seconds, the low-pressure holding signal changes from valid to invalid. Therefore, during the valid period of the low-pressure signal, the electronic parking brake system 6 can be powered by the high-voltage accessory DC / DC2 to perform P-gear operation, and after the high-voltage accessory DC / DC2 is turned off, it is powered by the battery 3.

[0066] It should be understood that the specific features, operations, and details described herein with respect to the methods of this application can also be similarly applied to the apparatus and system of this application, or vice versa. Furthermore, each step of the methods of this application described above can be performed by a corresponding component or unit of the apparatus or system of this application.

[0067] It should be understood that the various modules / units of the device of this application can be implemented wholly or partially through software, hardware, firmware, or a combination thereof. Each module / unit can be embedded in the processor of the electronic device in hardware or firmware form or independent of the processor, or it can be stored in the memory of the electronic device in software form for the processor to call to execute the operation of each module / unit. Each module / unit can be implemented as an independent component or module, or two or more modules / units can be implemented as a single component or module.

[0068] like Figure 4 As shown, this application provides an electronic device 400, which includes a processor 401 and a memory 402 storing computer program instructions. The processor 401 executes the computer program instructions to implement the steps of the aforementioned P-gear control method for new energy vehicles. This electronic device 400 can be broadly categorized as a server, terminal, or any other electronic device with the necessary computing and / or processing capabilities.

[0069] In one embodiment, the electronic device 400 may include a processor, memory, network interface, communication interface, etc., connected via a system bus. The processor of the electronic device 400 can be used to provide necessary computing, processing, and / or control capabilities. The memory of the electronic device 400 may include non-volatile storage media and internal memory. The non-volatile storage media may store an operating system, computer programs, etc. The internal memory can provide an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface and communication interface of the electronic device 400 can be used to connect and communicate with external devices via a network. When the computer program is executed by the processor, it performs the steps of the method of this application.

[0070] This application provides a computer-readable storage medium storing computer program instructions, which, when executed by a processor, implement the aforementioned P-gear control method for new energy vehicles.

[0071] Those skilled in the art will understand that the method steps of this application can be performed by a computer program instructing related hardware, such as electronic device 400 or a processor. The computer program can be stored in a non-transitory computer-readable storage medium, and its execution causes the steps of this application to be performed. Depending on the context, any reference herein to memory, storage, or other media may include non-volatile or volatile memory. Examples of non-volatile memory include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, magnetic tape, floppy disk, magneto-optical data storage device, optical data storage device, hard disk, solid-state drive, etc. Examples of volatile memory include random access memory (RAM), external cache memory, etc.

[0072] The technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification, provided that such combination does not contain contradictions.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A P-gear control method of a new energy vehicle, applied to a vehicle control unit, characterized in that, include: Upon receiving a high-voltage power-down command, the motion status of the new energy vehicle can be obtained; When the motion state of the new energy vehicle meets preset conditions, a low-voltage holding signal and a P-gear request signal are generated. The P gear request signal is sent to the electronic parking brake system; Determine whether the low-voltage holding signal is a valid signal; When the low-voltage holding signal is valid, the high-voltage accessory is controlled to continue supplying power to the electronic parking brake system so that the electronic parking brake system can perform P gear operation based on the P gear request signal.

2. The P-gear control method for new energy vehicles according to claim 1, characterized in that, The determination of whether the low-voltage holding signal is a valid signal includes: If a feedback signal indicating that P gear has been executed is obtained within a preset time, or if no feedback signal is obtained after the preset time has expired, the low-voltage holding signal is determined to be invalid. If no feedback signal indicating that P-mode has been executed is obtained within a preset time, the low-voltage holding signal is determined to be a valid signal.

3. The P-gear control method for new energy vehicles according to claim 1, characterized in that, The motion state includes the vehicle speed of the new energy vehicle. When the motion state of the new energy vehicle meets preset conditions, generating a low-voltage hold signal and a P-gear request signal includes: When the speed of the new energy vehicle is below a preset value, a low-voltage hold signal and a P gear request signal are generated.

4. The P-gear control method for new energy vehicles according to claim 2, characterized in that, The preset time is the longest response time for the electronic parking brake system to execute the P gear operation.

5. The P-gear control method for new energy vehicles according to claim 1, characterized in that, The method further includes: If the low-voltage holding signal is invalid, the high-voltage accessory is controlled to shut down to stop the high-voltage accessory from supplying power to the electronic parking brake system.

6. A P-gear control device for a new energy vehicle, applied to the vehicle controller, characterized in that, include: The acquisition module is used to acquire the motion status of the new energy vehicle upon receiving a high-voltage power-down command. The generation module is used to generate a low-voltage holding signal and a P-gear request signal when the motion state of the new energy vehicle meets preset conditions. The sending module is used to send the P gear request signal to the electronic parking brake system; The judgment module is used to determine whether the low-voltage holding signal is a valid signal; The control module is configured to control the high-voltage accessory to continue supplying power to the electronic parking brake system when the low-voltage holding signal is a valid signal, so that the electronic parking brake system can perform P gear operation based on the P gear request signal.

7. A vehicle controller for a new energy vehicle, characterized in that, It includes a power-on / off software module and the P-gear control device as described in claim 6. The power-on / off software module is used to acquire a high-voltage power-off command and control the high-voltage accessory to be shut down based on the high-voltage power-off command.

8. A new energy vehicle, characterized in that, Includes a power battery and battery management system, high-voltage accessories, electronic parking brake system, storage battery, and the vehicle controller as described in claim 7; The power battery and battery management system are used to supply power to the electronic parking brake system and the vehicle controller respectively after being transformed by the high voltage accessory, and to charge the battery. The battery is used to supply power to the vehicle controller and the electronic parking brake system after the high voltage is turned off; The vehicle controller is communicatively connected to the power battery and battery management system and the electronic parking brake system, respectively, and is used to send control commands to the power battery and battery management system to control the opening or closing of high-voltage accessories, and to send control commands to the electronic parking brake system to execute the P gear operation.

9. An electronic device, characterized in that, The electronic device includes: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, it implements the P-gear control method for new energy vehicles as described in any one of claims 1-5.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions, which, when executed by a processor, implement the P-gear control method for a new energy vehicle as described in any one of claims 1-5.

Images