Delayed power-off protection method, system and device and storage medium

Abstract

The invention belongs to the technical field of automobile power-off, and provides a delayed power-off protection method, system and device and a storage medium, and the method comprises the steps: detecting the current state of a vehicle based on a power-off signal; judging whether the vehicle meets a power-off condition based on the current state of the vehicle; if the vehicle does not meet the power-off condition, delaying to trigger power-off until the vehicle meets the power-off condition; if the vehicle meets the power-off condition, executing a hierarchical delay power-off strategy; and performing anomaly detection and executing a corresponding protection strategy based on an anomaly detection result. According to the method, in the order placing process, whether the vehicle meets the power-off condition or not is judged firstly, the hierarchical delay strategy can be executed after the power-off condition is met, differential delay is set according to different requirements of high-voltage equipment, power control equipment and low-voltage equipment, the one-step type power-off risk is avoided, the one-step power-off mode is avoided, and the power-off efficiency is improved. In addition, the hierarchical delay strategy simplifies the power-off process.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile power-off technology, and in particular relates to a delayed power-off protection method, system, device and storage medium. Background Art

[0002] Early new energy vehicles (NEVs) faced deficiencies in their high-voltage brownout protection circuit design and control logic. Traditional brownout protection solutions employed a one-size-fits-all approach to power-off, which could easily damage onboard components. Core components of NEVs (including EVs and PHEVs), such as the high-voltage battery system, motor controller, battery management system (BMS), and vehicle central control unit (VCU), all require complex power-off procedures during a brownout. Therefore, minimizing damage to these components during a brownout has become a key technical challenge. Summary of the Invention

[0003] In order to solve the problems in the background technology, the present invention proposes a delayed power-off protection method, system, device and storage medium.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A delayed power-off protection method comprises the following steps: Receive power-off signal; Detect the current state of the vehicle based on the power-off signal; Determine whether the vehicle meets the power-off conditions based on the vehicle's current status; If the vehicle does not meet the power-off conditions, the power-off triggering will be delayed until the vehicle meets the power-off conditions; If the vehicle meets the power-off conditions, the hierarchical delayed power-off strategy is implemented; When executing the hierarchical delayed power-off strategy, anomaly detection is performed and the corresponding protection strategy is executed based on the anomaly detection results.

[0005] Preferably, detecting the current state of the vehicle based on the power-off signal includes the following steps: Detect the voltage on the high-voltage side of the vehicle; Detect the speed of the vehicle motor; Check the voltage of the vehicle's low-voltage battery.

[0006] Preferably, determining whether the vehicle meets the power-off condition based on the current state of the vehicle includes the following steps: Determining whether the voltage fluctuation on the high-voltage side is less than a first threshold; determining whether the rotational speed of the motor drops below a second threshold; determining whether the voltage of the low-voltage battery is greater than or equal to a third threshold; If the high-voltage side voltage fluctuation is less than the first threshold, the motor speed drops below the second threshold, and the low-voltage battery voltage is greater than or equal to the third threshold, the vehicle meets the power-off conditions; otherwise, the vehicle does not meet the power-off conditions.

[0007] Preferably, the first threshold is 5%, the second threshold is 100 rpm, and the third threshold is 11.5V.

[0008] Preferably, executing the hierarchical delayed power-off strategy includes the following steps: Execute the first-level delay strategy within 0.5-5 seconds, including: Control the high-voltage contactor to disconnect, start the pre-discharge circuit, reduce the high-voltage capacitor voltage to a safe threshold through the discharge resistor, and record the power battery pack status data in the non-volatile memory; If the central controller detects that the discharge voltage drop rate is greater than 10V / s during the discharge process, it will cut off all power supplies and report a fault code; Execute the secondary delay strategy within 5-30 seconds, including: After the vehicle controller data is stored, the CAN communication module is turned off and the power supply to the 12V low-voltage battery is cut off via the time delay relay, thereby disconnecting the wake-up signal. Keep the water pump and cooling fan running until the vehicle motor temperature is less than 60°C; Execute a three-level delay strategy within 30-300 seconds, including: Gradually shut down the vehicle's low-voltage equipment and finally disconnect the vehicle's low-voltage battery master switch; If the battery voltage is detected to be lower than 11V, the three-level delay strategy will be terminated in advance to prevent the battery from over-discharging.

[0009] Preferably, performing anomaly detection and executing corresponding protection strategies based on the anomaly detection results include the following steps: During abnormality detection, if the short-circuit current is detected to be greater than 50A or the high-voltage leakage resistance is less than 100kΩ, the hierarchical delayed power-off strategy is skipped, the power battery pack and low-voltage battery are disconnected, and an alarm is sounded through the buzzer; After power-off is complete, the vehicle's central controller enters a low-power wake-up mode and waits for a power-on signal.

[0010] A delayed power-off protection system, comprising: The central controller is used to receive the power-off signal and determine whether the vehicle meets the power-off conditions based on the current state of the vehicle; A battery management unit and a sensor unit for detecting the current state of the vehicle based on the power-off signal; The delay unit is used to delay the triggering of power-off when the vehicle does not meet the power-off conditions until the vehicle meets the power-off conditions; The delay unit is also used to execute a hierarchical delayed power-off strategy when the vehicle meets the power-off conditions; The anomaly detection unit is used to perform anomaly detection when executing the hierarchical delay strategy and execute the corresponding protection strategy based on the anomaly detection result.

[0011] Preferably, when detecting the current state of the vehicle based on the power-off signal: The battery management unit is used to detect the voltage on the high-voltage side of the vehicle; The sensor unit is used to detect the rotation speed of the vehicle motor and the voltage of the low-voltage battery.

[0012] Preferably, the delay unit is used for: In the first-level delay strategy, the delay is 0.5-5s, so that: The battery management unit controls the high-voltage contactor to disconnect, starts the pre-discharge circuit, reduces the high-voltage capacitor voltage to a safe threshold through the discharge resistor, and records the power battery pack status data in the non-volatile memory; If the central controller detects that the discharge voltage drop rate is greater than 10V / s during the discharge process, it will cut off all power supplies and report a fault code; In the secondary delay strategy, delay 5-30s to make: Complete data storage of the vehicle controller, turn off the CAN communication module, and cut off the power supply of the 12V low-voltage battery through the delay relay, thereby disconnecting the wake-up signal; the vehicle controller includes a central controller, a motor controller and a charger; Keep the water pump and cooling fan running until the vehicle motor temperature is less than 60°C; In the three-level delay strategy, the delay is 30-300s, so that: The vehicle's low-voltage equipment is gradually shut down, and finally the vehicle's low-voltage battery main switch is cut off; If the sensor unit detects that the low-voltage battery voltage is lower than 11V, the central controller terminates the three-level delay strategy to prevent the low-voltage battery from over-discharging.

[0013] Preferably, when performing anomaly detection and executing a corresponding protection strategy based on the anomaly detection result, the anomaly detection unit is configured to: Detect short-circuit current and high-voltage leakage resistance; If the short-circuit current is greater than 50A or the high-voltage leakage resistance is less than 100kΩ, the central controller will skip the hierarchical delay power-off strategy, disconnect the power battery pack and low-voltage battery, and sound an alarm through the buzzer; After power-off is complete, the vehicle's central controller enters a low-power wake-up mode and waits for a power-on signal.

[0014] An electronic device, comprising: Memory for storing computer programs; The processor is used to implement the above-mentioned delayed power-off protection method when executing the computer program stored in the memory.

[0015] A computer-readable storage medium stores a computer program, which implements the above-mentioned delayed power-off protection method when executed by a processor.

[0016] Beneficial effects of the present invention: 1. During the ordering process, the method of the present invention first determines whether the vehicle meets the power-off conditions. After the power-off conditions are met, a hierarchical delay strategy can be implemented to set differentiated delays based on the different requirements of high-voltage, power control, and low-voltage equipment, thereby avoiding the risk of a "one-size-fits-all" power-off and protecting the on-board devices on the vehicle. In addition, the hierarchical delay strategy hierarchically controls core components such as the VCU and BMS, simplifying the complex power-off process. 2. The method of the present invention ensures data integrity, which ensures that the controller completes the storage of key data before power failure, thereby improving system reliability; 3. The method of the present invention proposes an abnormal response mechanism, which can monitor electrical faults during power-off in real time, achieve emergency shutdown, and reduce safety hazards; 4. The method of the present invention can extend the life of components by delaying the operation of the cooling system to avoid thermal stress damage to the motor and battery caused by sudden shutdown; 5. The present invention coordinates the hierarchical delayed power-off strategy of the high-voltage side, controller and low-voltage equipment through a central controller, combined with status detection and abnormality handling mechanisms, to achieve safe discharge of high-voltage capacitors, complete data storage and smooth shutdown of mechanical components, thereby improving the safety and reliability of the vehicle power-off process.

[0017] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A flow chart of a delayed power-off protection method of the present invention is shown; Figure 2The figure shows a structural diagram of a time-delay power-off protection system of the present invention. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0021] like Figure 1 As shown, a delayed power-off protection method includes the following steps: S1: Receives a power-off signal.

[0022] S2: Detect the current state of the vehicle based on the power-off signal.

[0023] S3: Determine whether the vehicle meets the power-off conditions based on the current state of the vehicle.

[0024] S4: If the vehicle does not meet the power-off conditions, the power-off trigger is delayed until the vehicle meets the power-off conditions; if the vehicle meets the power-off conditions, the hierarchical delayed power-off strategy is executed; S5: When executing the hierarchical delayed power-off strategy, anomaly detection is performed and a corresponding protection strategy is executed based on the anomaly detection result.

[0025] It's important to note that this method triggers the process by receiving a power-off signal. Based on the signal, it detects the vehicle's status and determines whether power-off conditions are met. If not, it proactively intervenes by delaying the cooling or braking systems to ensure safety. When conditions are met, a tiered delayed power-off strategy is implemented to fine-tune power management. Furthermore, anomaly detection and protection strategies are implemented throughout the entire process, enabling comprehensive risk monitoring. The overall design balances safety, resource efficiency, user experience, and maintainability, meeting functional safety standards and applicable to a wide range of vehicle types.

[0026] S2 includes the following steps: First, it is necessary to use professional voltage detection equipment to detect the voltage on the high-voltage side of the vehicle to determine the power supply status of the high-voltage system; then, use a speed sensor to monitor the speed of the vehicle's motor in real time to understand the motor's operating conditions; finally, use specific measuring instruments to detect the voltage of the vehicle's low-voltage battery to evaluate the battery's power level and performance.

[0027] S3 includes the following steps: S301: Determine whether the voltage fluctuation on the high-voltage side is less than the first threshold, which is preferably 5%; S302: Determine whether the speed of the motor drops below the second threshold, which is preferably 100rpm; S303: Determine whether the voltage of the low-voltage battery is greater than or equal to the third threshold, which is preferably 11.5V, to avoid being unable to wake up after power-off; S304: If the voltage fluctuation on the high-voltage side is less than the first threshold, the speed of the motor drops below the second threshold and the voltage of the low-voltage battery is greater than or equal to the third threshold, the vehicle meets the power-off conditions, otherwise the vehicle does not meet the power-off conditions.

[0028] Taking a certain model of pure electric new energy vehicle as an example, when executing step S3, the specific implementation process is as follows: In S301, the vehicle's onboard BMS (Battery Management System) collects high-voltage side voltage data in real time. Assuming the vehicle's high-voltage system is rated at 400V, the BMS records the voltage value every 0.1 second. After collecting 10 data points, the voltage fluctuation percentage of adjacent data points is calculated. For example, if the voltages collected in a certain order are 398V, 396V, 397V, 395V, 396V, 397V, 398V, 396V, 397V, and 395V, the calculated maximum voltage fluctuation is (398-395) / 400*100%=0.75%, which is less than the first threshold of 5%, and this step is considered passed. In S302, a Hall-effect speed sensor mounted on the motor shaft collects motor speed information. The sensor transmits the speed signal to the VCU (Vehicle Control Unit). As the vehicle decelerates to a stop, the VCU monitors the motor speed gradually decreasing from 800 rpm. If, at a certain point, the speed drops to 95 rpm, below the second threshold of 100 rpm, the vehicle is deemed to have met the requirements. In S303, a dedicated battery monitoring module is used to detect the low-voltage battery voltage. When the vehicle is about to be powered off, the low-voltage battery voltage is read to be 12.2V, which is greater than the third threshold of 11.5V, indicating that the battery is sufficient to ensure normal wake-up of the vehicle after powering off. Based on the judgment results of S301-S303, since the high-voltage side voltage fluctuation is less than the first threshold, the motor speed drops below the second threshold, and the low-voltage battery voltage is greater than the third threshold, in S304, the VCU determines that the vehicle meets the power-off conditions and immediately issues a command to control the vehicle to complete the power-off process; if any of the conditions is not met, for example, the high-voltage side voltage fluctuation reaches 6%, the VCU determines that the vehicle does not meet the power-off conditions and prompts the driver through the instrument panel that there is an abnormality in the vehicle and the power-off operation cannot be performed.

[0029] In S4, a hierarchical delayed power-off strategy is executed, including the following steps: S401: Executes a first-level delay strategy within 0.5-5 seconds, mainly used for high-voltage system power outages, including: The VCU controls the high-voltage contactor to disconnect, activates the pre-discharge circuit, and reduces the high-voltage capacitor voltage to a safe threshold (e.g., <60V) through the discharge resistor. It also records battery (e.g., power battery pack) status data in non-volatile memory. If the VCU detects an abnormal discharge voltage drop rate (e.g., >10V / s) during the discharge process, it disconnects all power supplies and reports a fault code.

[0030] S402: Executes the secondary delay strategy within 5-30 seconds, mainly used for power-related controller power outages, including: Complete data storage for the vehicle controllers (VCU, motor controller, charger, and other controllers), shut down the CAN communication module, and disconnect the 12V low-voltage battery power supply via the time-delay relay (disconnecting the wake-up signal). Keep the water pump and cooling fan running until the vehicle motor temperature drops to a safe range (e.g., <60°C).

[0031] S403: Executes a three-level delay strategy within 30-300 seconds, mainly used to power off low-voltage auxiliary equipment, including: The system gradually shuts down the vehicle's low-voltage devices (such as lights, entertainment systems, and sensors), ultimately disconnecting the vehicle's low-voltage battery master switch. If the battery voltage is detected to be below 11V, the three-stage delay strategy is terminated prematurely to prevent excessive battery discharge.

[0032] S5 includes the following steps: S501: During abnormality detection, if the short-circuit current is detected to be greater than 50A or the high-voltage leakage resistance value is less than 100kΩ, the hierarchical delayed power-off strategy is skipped, the power battery pack (high-voltage side) and the low-voltage battery are disconnected, and an alarm is sounded through the buzzer; S502: After the power-off is completed, the vehicle's central controller enters a low-power wake-up mode and waits for the power-on signal.

[0033] like Figure 2 Figure 1 shows a delayed power-off protection system, which includes a central controller, a battery management unit, a sensor unit, a delay unit, and an anomaly detection unit. The central controller receives vehicle power-off signals (such as key power-off and remote power-off commands), coordinates the delayed power-off logic of each subsystem, and determines whether the vehicle meets the power-off conditions based on its current state.

[0034] The battery management unit and sensor unit detect the vehicle's current status based on power-off signals. The battery management unit monitors the power battery pack's status (voltage, temperature, and remaining charge), controlling the high-voltage contactor's on / off function and pre-charging circuit. The sensor unit includes sensors for high-voltage side voltage, low-voltage battery voltage, motor speed, and coolant temperature, providing real-time feedback on device status.

[0035] The delay unit includes multi-stage delay relays or solid-state switches, supporting an adjustable delay of 0.1-300 seconds, corresponding to the power-off priority of different components. It is mainly used to delay the triggering of power-off when the vehicle does not meet the power-off conditions until the vehicle meets the power-off conditions; the delay unit is also used to execute a hierarchical delayed power-off strategy when the vehicle meets the power-off conditions.

[0036] The anomaly detection unit integrates overvoltage, overcurrent, and short-circuit detection circuits to monitor anomalies and trigger emergency shutdown during power-off. For example, it is used to perform anomaly detection when executing a graded delay strategy and execute corresponding protection strategies based on the anomaly detection results.

[0037] Specifically, when detecting the current state of the vehicle based on the power-off signal: the battery management unit is used to detect the voltage on the high-voltage side of the vehicle; the sensor unit is used to detect the speed of the vehicle motor and the voltage of the low-voltage battery.

[0038] Specifically, the delay unit is used to: In the first-level delay strategy, a delay of 0.5-5s causes the battery management unit to control the high-voltage contactor to disconnect, start the pre-discharge circuit, reduce the high-voltage capacitor voltage to a safe threshold through the discharge resistor, and simultaneously record the battery (such as the power battery pack) status data in the non-volatile memory. If the VCU detects a discharge voltage drop rate greater than 10V / s during the discharge process, it cuts off all power supplies and reports a fault code. In the secondary delay strategy, a delay of 5-30 seconds is used to: complete the data storage of the vehicle controller, shut down the CAN communication module, and cut off the power supply of the 12V low-voltage battery through the delay relay; the vehicle controller includes the central controller, motor controller and charger; and keep the water pump and cooling fan running until the vehicle motor temperature is less than 60°C; In the three-level delay strategy, the delay is 30-300s, so that: the vehicle's low-voltage equipment is gradually shut down, and finally the vehicle's low-voltage battery main switch is cut off; if the sensor unit detects that the low-voltage battery voltage is lower than 11V, the central controller terminates the three-level delay strategy to prevent the low-voltage battery from over-discharging.

[0039] Specifically, when performing anomaly detection and executing a corresponding protection strategy based on the anomaly detection result, the anomaly detection unit is used to: Detect short-circuit current and high-voltage leakage resistance; if the short-circuit current is greater than 50A or the high-voltage leakage resistance is less than 100kΩ, the central controller skips the hierarchical delayed power-off strategy, disconnects the power battery pack and low-voltage battery, and issues an alarm through the buzzer; after power-off, the vehicle's central controller enters low-power wake-up mode and waits for the power-on signal.

[0040] The following combines the method and system, taking a pure electric vehicle as an example, when the driver pulls out the key, a power-off signal is triggered: 1. The VCU first detects the motor speed (via a resolver sensor). If the speed is > 100 rpm, it sends a command to the cooling system relay to shut down the cooling fan after a delay of 5 seconds. 2. After receiving the power-off command, the BMS disconnects the main contactor, starts the pre-discharge resistor, and monitors the high-voltage bus voltage, which takes 8 seconds to drop from 380V to 50V (first-level delay). 3. After the high-voltage system is safely discharged, the VCU sends a "data storage" command to the motor controller, waits 2 seconds to confirm that the storage is complete, and then cuts off the 12V power supply to the motor controller (secondary delay 10 seconds); 4. Finally, turn off low-voltage equipment such as lights and instrument panels in turn, and disconnect the negative terminal of the low-voltage battery after a 30-second delay (three-level delay); 5. If the battery temperature is detected to be greater than 70°C during the secondary delay period, the cooling fan operation time will be automatically extended until the temperature is less than 60°C to ensure sufficient cooling of the motor.

[0041] An electronic device, comprising: Memory for storing computer programs; The processor is used to implement the above-mentioned delayed power-off protection method when executing the computer program stored in the memory.

[0042] It should be noted that the memory may include a random access memory (RAM) or a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0043] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0044] A computer-readable storage medium stores a computer program, which implements the above-mentioned delayed power-off protection method when executed by a processor.

[0045] It should be noted that the computer-readable storage medium may be included in the device / apparatus described in the above embodiments, or may exist independently and not be incorporated into the device / apparatus. The computer-readable storage medium carries one or more programs, which, when executed, implement a delayed power-off protection method according to an embodiment of the present invention.

[0046] According to an embodiment of the present invention, a computer-readable storage medium may be a non-volatile computer-readable storage medium, such as a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0047] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A delayed power-off protection method, characterized in that: The following steps are involved: Receive power-off signal; Detect the current state of the vehicle based on the power-off signal; Determine whether the vehicle meets the power-off conditions based on the vehicle's current status; If the vehicle does not meet the power-off conditions, the power-off triggering will be delayed until the vehicle meets the power-off conditions; If the vehicle meets the power-off conditions, the hierarchical delayed power-off strategy is implemented; When executing the hierarchical delayed power-off strategy, anomaly detection is performed and the corresponding protection strategy is executed based on the anomaly detection results.

2. The delayed power-off protection method according to claim 1, characterized in that: Detecting the current state of the vehicle based on the power-off signal includes the following steps: Detect the voltage on the high-voltage side of the vehicle; Detect the speed of the vehicle motor; Check the voltage of the vehicle's low-voltage battery.

3. The delayed power-off protection method according to claim 2, characterized in that: Determining whether the vehicle meets the power-off conditions based on the vehicle's current status includes the following steps: Determining whether the voltage fluctuation on the high-voltage side is less than a first threshold; determining whether the rotational speed of the motor drops below a second threshold; determining whether the voltage of the low-voltage battery is greater than or equal to a third threshold; If the high-voltage side voltage fluctuation is less than the first threshold, the motor speed drops below the second threshold, and the low-voltage battery voltage is greater than or equal to the third threshold, the vehicle meets the power-off conditions; otherwise, the vehicle does not meet the power-off conditions.

4. The delayed power-off protection method according to claim 3, characterized in that: The first threshold is 5%, the second threshold is 100 rpm, and the third threshold is 11.5V.

5. The delayed power-off protection method according to claim 1, characterized in that: Implementing a hierarchical delayed power-off strategy includes the following steps: Execute the first-level delay strategy within 0.5-5 seconds, including: Control the high-voltage contactor to disconnect, start the pre-discharge circuit, reduce the high-voltage capacitor voltage to a safe threshold through the discharge resistor, and record the power battery pack status data in the non-volatile memory; If the central controller detects that the discharge voltage drop rate is greater than 10V / s during the discharge process, it will cut off all power supplies and report a fault code; Execute the secondary delay strategy within 5-30 seconds, including: After the vehicle controller data is stored, the CAN communication module is turned off and the power supply to the 12V low-voltage battery is cut off via the time delay relay, thereby disconnecting the wake-up signal. Keep the water pump and cooling fan running until the vehicle motor temperature is less than 60°C; Execute a three-level delay strategy within 30-300 seconds, including: Gradually shut down the vehicle's low-voltage equipment and finally disconnect the vehicle's low-voltage battery master switch; If the battery voltage is detected to be lower than 11V, the three-level delay strategy will be terminated in advance to prevent the battery from over-discharging.

6. The delayed power-off protection method according to claim 1, characterized in that: Performing anomaly detection and executing corresponding protection strategies based on the anomaly detection results includes the following steps: During abnormality detection, if the short-circuit current is detected to be greater than 50A or the high-voltage leakage resistance is less than 100kΩ, the hierarchical delayed power-off strategy is skipped, the power battery pack and low-voltage battery are disconnected, and an alarm is sounded through the buzzer; After power-off is complete, the vehicle's central controller enters a low-power wake-up mode and waits for a power-on signal.

7. A delayed power-off protection system, characterized in that: include: The central controller is used to receive the power-off signal and determine whether the vehicle meets the power-off conditions based on the current state of the vehicle; A battery management unit and a sensor unit for detecting the current state of the vehicle based on the power-off signal; The delay unit is used to delay the triggering of power-off when the vehicle does not meet the power-off conditions until the vehicle meets the power-off conditions; The delay unit is also used to execute a hierarchical delayed power-off strategy when the vehicle meets the power-off conditions; The anomaly detection unit is used to perform anomaly detection when executing the hierarchical delay strategy and execute the corresponding protection strategy based on the anomaly detection result.

8. The delayed power-off protection system according to claim 7, characterized in that: When detecting the vehicle's current status based on the power-off signal: The battery management unit is used to detect the voltage on the high-voltage side of the vehicle; The sensor unit is used to detect the rotation speed of the vehicle motor and the voltage of the low-voltage battery.

9. The delayed power-off protection system according to claim 7, characterized in that: The delay unit is used for: In the first-level delay strategy, the delay is 0.5-5s, so that: The battery management unit controls the high-voltage contactor to disconnect, starts the pre-discharge circuit, reduces the high-voltage capacitor voltage to a safe threshold through the discharge resistor, and records the power battery pack status data in the non-volatile memory; If the central controller detects that the discharge voltage drop rate is greater than 10V / s during the discharge process, it will cut off all power supplies and report a fault code; In the secondary delay strategy, delay 5-30s to make: Complete data storage of the vehicle controller, turn off the CAN communication module, and cut off the power supply of the 12V low-voltage battery through the delay relay, thereby disconnecting the wake-up signal; the vehicle controller includes a central controller, a motor controller and a charger; Keep the water pump and cooling fan running until the vehicle motor temperature is less than 60°C; In the three-level delay strategy, the delay is 30-300s, so that: The vehicle's low-voltage equipment is gradually shut down, and finally the vehicle's low-voltage battery main switch is cut off; If the sensor unit detects that the low-voltage battery voltage is lower than 11V, the central controller terminates the three-level delay strategy to prevent the low-voltage battery from over-discharging.

10. A delayed power-off protection system according to any one of claims 1 to 9, characterized in that: When performing anomaly detection and executing a corresponding protection strategy based on the anomaly detection result, the anomaly detection unit is used to: Detect short-circuit current and high-voltage leakage resistance; If the short-circuit current is greater than 50A or the high-voltage leakage resistance is less than 100kΩ, the central controller will skip the hierarchical delay power-off strategy, disconnect the power battery pack and low-voltage battery, and sound an alarm through the buzzer; After power-off is complete, the vehicle's central controller enters a low-power wake-up mode and waits for a power-on signal.

11. An electronic device, characterized in that: include: Memory for storing computer programs; The processor is configured to implement the delayed power-off protection method according to any one of claims 1 to 6 when executing a computer program stored in a memory.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the delayed power-off protection method according to any one of claims 1 to 6 is implemented.

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