Control method, vehicle, electronic device, and computer-readable storage medium

Abstract

The application provides a control method, a vehicle, an electronic device and a computer readable storage medium. When the vehicle is in a high-voltage power-on state, the battery voltage of a low-voltage battery is monitored. When it is monitored that the battery voltage is lower than a first voltage threshold, a request instruction is sent to a direct-current conversion device, and the timing of a timer is started. The direct-current conversion device supplies power to the low-voltage battery according to the request instruction. If the battery voltage of the low-voltage battery is still lower than the first voltage threshold when the timing value of the timer reaches a preset time length, first prompt information is output to the display instrument of the vehicle. In this way, when it is monitored that the battery voltage is lower than the first voltage threshold, the direct-current conversion device is first attempted to supply power to the low-voltage battery, and when the direct-current conversion device fails to supply power to the low-voltage battery, the first prompt information is output to prompt the user that the low-voltage battery of the vehicle is in an abnormal state. The user can park in time under the prompt of the first prompt information, and the abnormal power-off of the vehicle and unnecessary prompting can be reduced.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to a control method, a vehicle, an electronic device, and a computer-readable storage medium. Background Technology

[0002] Currently, the low-voltage components of the vehicle need to be powered by the battery, including the starting (ignition) device, the vehicle controller, etc.; the dangers of a depleted battery include: causing some vehicle components to malfunction; or causing the battery to automatically cut off power when the vehicle is in motion or running, resulting in an abnormal power outage. Summary of the Invention

[0003] This application provides a control method, a vehicle, an electronic device, and a computer-readable storage medium, aimed at improving the problem of abnormal low-voltage battery occurrence.

[0004] This application provides a method for controlling a vehicle, the vehicle including a power battery, a low-voltage battery, and a DC-DC converter, wherein the power battery is connected to the input terminal of the DC-DC converter, and the output terminal of the DC-DC converter is connected to the low-voltage battery, the control method comprising: When the vehicle is in a high-voltage power-on state, monitor the battery voltage of the low-voltage battery; When the battery voltage is lower than the first voltage threshold, a request command is sent to the DC-DC converter and the timing of the timer is started; wherein, the DC-DC converter converts the electrical energy provided by the power battery into voltage according to the request command and supplies power to the low-voltage battery. When the timer reaches a preset duration and the battery voltage is still lower than the first voltage threshold, a first prompt message is output to the vehicle's display instrument panel; wherein, the first prompt message is used to indicate that the low-voltage battery is malfunctioning.

[0005] In the control method of this application, when the vehicle is in a high-voltage power-on state, the battery voltage of the low-voltage battery is monitored. When the battery voltage is detected to be lower than a first voltage threshold, a request command is sent to the DC-DC converter, and a timer is started. The DC-DC converter converts the electrical energy provided by the power battery into voltage to supply power to the low-voltage battery according to the request command. If the battery voltage of the low-voltage battery is still lower than the first voltage threshold after the timer reaches a preset duration, a first prompt message is output to the vehicle's display instrument. In this way, when the battery voltage of the low-voltage battery is detected to be lower than the first voltage threshold, an attempt is made to request the DC-DC converter to supply power to the low-voltage battery. If the DC-DC converter fails to supply power to the low-voltage battery, a first prompt message is output to inform the user that the vehicle's low-voltage battery is in an abnormal state. The user can stop the vehicle in time and check and repair the low-voltage battery after being reminded by the first prompt message, preventing abnormal power loss of the vehicle due to automatic disconnection of the low-voltage battery power supply abnormality. Therefore, abnormal power loss of the vehicle and unnecessary prompts can be reduced.

[0006] In one embodiment, the step of sending a request command to the DC-DC converter and starting the timer when the battery voltage is lower than a first voltage threshold includes: When the battery voltage is lower than the first voltage threshold, a first request command is sent to the DC-DC converter, and the timing of the timer is started; wherein, the DC-DC converter refreshes its internal control signal according to the first request command to restart the voltage conversion. When the timer reaches the first preset duration and the battery voltage is still lower than the first voltage threshold, a second request instruction is sent to the DC-DC converter; wherein the DC-DC converter is reset and restarted according to the second request instruction.

[0007] In this embodiment, when the battery voltage is lower than a first voltage threshold, an internal control signal with minimal impact on the system is first used to attempt to request the DC-DC converter to supply power to the low-voltage battery. If the request fails, and the battery voltage is still lower than the first voltage threshold when the timer's count reaches the first preset threshold, a second request command is sent to the DC-DC converter to attempt to reset and restart it to supply power to the low-voltage battery. By using a layered request process, the system attempts to request the DC-DC converter to supply power to the low-voltage battery as much as possible, thus maximizing the maintenance of normal vehicle operation, reducing the likelihood of vehicle power outages due to abnormal low-voltage battery power supply, and mitigating the impact of abnormal low-voltage power supply.

[0008] In one embodiment, the step of outputting a first prompt message to the vehicle's display instrument panel when the timer's countdown reaches a preset duration and the battery voltage is still lower than the first voltage threshold includes: When the timing value reaches the second preset duration and the battery voltage is still lower than the first voltage threshold, the first prompt message is output to the display instrument; wherein, the second preset duration is longer than the first preset duration.

[0009] In this embodiment, after two attempts to request the DC-DC converter to supply power to the low-voltage battery, and still failing to supply power to the low-voltage battery, the first prompt message is output to remind the user of the low-voltage battery power supply abnormality. This can improve the accuracy of the low-voltage battery power supply abnormality reminder and reduce abnormal vehicle power failure and unnecessary reminders.

[0010] In one embodiment, the control method further includes: When the battery voltage is lower than a second voltage threshold, the output power of the power battery is controlled to be less than or equal to a preset power; wherein, the second voltage threshold is lower than the first voltage threshold. Output a second prompt message to the display instrument; wherein the second prompt message is used to indicate that the battery voltage of the low-voltage battery is too low.

[0011] In this embodiment, when the battery voltage is lower than the second voltage threshold, it indicates that the voltage of the power battery is continuously decreasing. At this time, controlling the output power of the power battery to be less than or equal to a preset power allows the vehicle to operate at reduced power, thereby reducing vehicle speed and improving vehicle safety. A second prompt message is then output to remind the user that the low-voltage battery voltage is too low, further reminding the user to stop in time. Thus, by setting a first voltage threshold and a second voltage threshold, when the low-voltage battery voltage is too low, priority is given to requesting the DC-DC converter to supply power to the low-voltage battery, rather than directly cutting off power or limiting power, reducing unnecessary vehicle breakdowns. If the request fails, measures are taken to control the vehicle to operate at reduced power, and a prompt message is output to remind the user, providing a buffer time for the user to pull over, thereby improving vehicle safety and enhancing the user experience.

[0012] In one embodiment, the control method further includes: When the battery voltage is lower than the third voltage threshold, the vehicle is controlled to perform a high-voltage power-down procedure and the low-voltage battery is controlled to disconnect from power; wherein, when the battery voltage is lower than the third voltage threshold, the low-voltage battery is in an over-discharge state.

[0013] In this embodiment of the application, when the battery voltage is detected to be lower than the third voltage threshold, in order to prevent the low-voltage battery from continuing to discharge and causing the vehicle to suddenly lose power abnormally, the vehicle is directly controlled to execute the high-voltage power-off process, simulating the normal power-off process of the vehicle, and controlling the low-voltage battery to disconnect power, so as to ensure the safe power-off of the vehicle and prevent the low-voltage battery from continuing to discharge and being damaged.

[0014] In this embodiment, by setting a first voltage threshold, a second voltage threshold, and a third voltage threshold, a three-level gradient protection for the low-voltage battery is achieved, corresponding to three gradient protection actions: "attempting to restore power," "reducing speed and issuing a warning," and "forced parking." Compared to the single protection strategy of "directly shutting down the low-voltage battery when it is undervoltage," the three-level gradient protection can reduce unnecessary breakdowns and provide users with a buffer time to pull over. The high-voltage power-down process is only triggered when the low-voltage battery voltage drops to the third voltage threshold, enabling the low-voltage battery to achieve the goal of "restoring power if it can restore power autonomously, and safely parking if it cannot."

[0015] In one embodiment, the control method further includes: the control method further includes: The vehicle speed is monitored in real time during the high-voltage power-down process. When the vehicle speed is less than the preset speed, the lock bag flag is set; wherein, when the lock bag flag is set, the low-voltage battery remains de-energized.

[0016] By setting the lockout flag, the low-voltage battery is kept de-energized, preventing the user from restarting the vehicle and causing the low-voltage battery to continue discharging, which could damage the low-voltage battery or reduce its lifespan.

[0017] In one embodiment, controlling the vehicle to perform a high-voltage power-down procedure includes: Switch the vehicle's key status from the on state to the off state; The high-voltage power distribution system of the vehicle is controlled to stop working; Control the vehicle to park.

[0018] In this embodiment, when the battery voltage is detected to be lower than the third voltage threshold, the key status of the vehicle is switched from the on state to the off state, the high-voltage power distribution system is stopped working, and the vehicle gear is switched to the parking gear. This ensures that when the low-voltage battery voltage is too low, the high voltage of the vehicle is safely de-energized, and the electronic parking brake of the vehicle is engaged before the low-voltage battery is completely de-energized, so as not to cause the risk of the vehicle rolling away, thus ensuring vehicle safety.

[0019] A second aspect of this application provides an electronic device, including a processor and a memory, wherein... Memory, used to store computer programs; The processor is used to execute the program stored in memory to implement the method described above.

[0020] A third aspect of this application provides a vehicle including the electronic devices described above.

[0021] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described above. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a vehicle module provided in one embodiment of this application. Figure 2 This is a schematic flowchart of a vehicle control method provided in an embodiment of this application; Figure 3 yes Figure 2 Detailed flowcharts of steps S20 and 30; Figure 4 This is a schematic flowchart of a vehicle control method provided in another embodiment of this application; Figure 5 This is a schematic flowchart of a vehicle control method provided in another embodiment of this application; Figure 6 yes Figure 4 Detailed flowchart of step S60; Figure 7 This is a structural diagram of the electronic device provided in the embodiments of this application. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] Low-voltage components in electric vehicles are powered by low-voltage batteries. When the voltage of the low-voltage battery is low, it will automatically cut off the power supply, causing some components of the electric vehicle (such as low-voltage components) to malfunction. If the electric vehicle is powered by high voltage and the low-voltage battery cuts off the power supply, it will cause an unexpected power outage, affecting the user's use of the vehicle, or even rendering the vehicle unusable.

[0025] This application provides a vehicle control method that can solve the problem of unexpected power outages caused by low voltage batteries.

[0026] The relevant terms used in this application are explained as follows: Low-voltage battery: supplies power to low-voltage devices in the vehicle and provides constant power (the power required for the normal operation of various controllers), including the initial power supply to the vehicle's ignition (starting) system. The low-voltage battery can be a 12V storage battery.

[0027] Vehicle Controller (VCU): A crucial component for various vehicle strategy decisions, fault handling, and command transmission. The control methods described in this application can also be executed by the VCU. The VCU supports network management functions (supporting wake-up and sleep mechanisms via specific CAN signals) and can communicate with other components via CAN.

[0028] Low-voltage battery manager (LBMS): A controller for low-voltage batteries, capable of monitoring the battery's status and controlling its charging and discharging. The LBMS supports network management functions and can communicate with other components via CAN.

[0029] DC-DC converter: This device converts high-voltage DC power to low-voltage DC power, which can power low-voltage batteries or low-voltage equipment. The DC-DC converter supports network management functions and can communicate with other components via CAN.

[0030] Battery Management System (BMS): The controller for the vehicle's power battery, capable of controlling high-voltage relays, including pre-charge relays. The BMS supports network management functions (supporting wake-up and sleep mechanisms via specific CAN signals) and communicates with other components via CAN.

[0031] Display instrument: It can display various vehicle statuses, support network management functions, and communicate with other components via CAN.

[0032] The Electronic Park Brake (EPB), also known as the electronic handbrake, is a car system that uses electronic circuitry to control vehicle braking. Its main function is to replace the traditional lever-operated mechanical handbrake and maintain the braking state when the car is parked for an extended period of time.

[0033] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a vehicle 100 provided in an embodiment of this application. Figure 1As shown, vehicle 100 includes a low-voltage system 110 and a high-voltage power distribution system 120. The low-voltage system 110 includes a low-voltage battery 111, a low-voltage battery manager 112, a DC-DC converter 113, low-voltage equipment 114, a power supply switch 115, and a discharge switch 116. The high-voltage power distribution system 120 includes a power battery 121 and several high-voltage power distribution components 122. The low-voltage battery 111 is connected to the output terminal of the DC-DC converter 113 via the power supply switch 115, and the input terminal of the DC-DC converter 113 is connected to the power battery 121, allowing the power battery 121 to convert high voltage to low voltage via the DC-DC converter 113 to supply power to the low-voltage battery 111. The low-voltage battery 111 is also connected to the low-voltage equipment 114 via the discharge switch 116 to supply power to the low-voltage equipment 114. The low-voltage battery manager 112 is connected to the low-voltage battery 111 and can be directly used to control the power supply and disconnection of the low-voltage battery 111.

[0034] The power battery 121 is connected to the high-voltage power distribution assembly 122 to supply power to the high-voltage power distribution assembly 122, enabling the vehicle 100 to move. It is understood that the power battery 121 may also be equipped with a battery management system (not shown). When the main relay in the battery management system is closed, the power battery 121 can supply power to the high-voltage power distribution assembly 122. When the main relay in the battery management system is open, the power battery 121 stops supplying power to the high-voltage power distribution assembly 122. The high-voltage power distribution assembly 122 may include, but is not limited to, components requiring high-voltage power such as a drive motor, motor controller, on-board charger, and high-voltage distribution box.

[0035] The DC-DC converter 113 may include a DC-DC converter circuit 1131 and a DC controller 1132. The input terminal of the DC-DC converter circuit 1131 is connected to the power battery 121, and the output terminal of the DC-DC converter circuit 1131 is connected to the low-voltage battery 111 via a power switch 115. The DC controller 1132 controls the DC-DC converter circuit 1131 to convert the high-voltage DC power provided by the power battery 121 into low-voltage DC power to supply the low-voltage battery 111. The DC controller 1132 can achieve voltage conversion by sending a drive signal to the switching transistor in the DC-DC converter circuit 1131. The drive signal can be a PWM (Pulse Width Modulation) signal.

[0036] The DC controller 1132 can be communicatively connected to the vehicle controller or the low-voltage battery manager 112. The DC controller 1132 can receive instructions sent by the vehicle controller or the low-voltage battery manager 112 and control the DC conversion circuit 1131 to perform voltage conversion according to the instructions.

[0037] It is understood that the output of the DC-DC converter 113 can also be connected to the low-voltage device 114 so that the power battery 121 can also convert the high voltage to the low voltage through the DC-DC converter 113 to power the low-voltage device 114.

[0038] In this embodiment, the vehicle 100 may be equipped with multiple low-voltage devices 114, which may include at least a vehicle controller, ignition (starting device), motor controller, display instrument, lighting system, central control system, etc. The low-voltage battery manager 112 can communicate with the vehicle 100's CAN network via a CAN bus.

[0039] It is understandable that the low-voltage battery 111 and the low-voltage battery manager 112 can be configured integratedly or independently. The low-voltage battery 111 is the battery in the vehicle 100, such as a lithium battery.

[0040] Please see Figure 2 , Figure 2 A schematic flowchart of a vehicle control method provided in an embodiment of this application is shown. In at least one embodiment, the control method can be executed by a vehicle controller in vehicle 100. In other embodiments, the control method can also be executed by a low-voltage battery manager 112.

[0041] like Figure 2 As shown, the control method provided in this application embodiment may include the following steps: Step S10: When the vehicle is in a high-voltage power-on state, monitor the battery voltage of the low-voltage battery.

[0042] When the vehicle 100 is in a high-voltage power-on state, it indicates that the main relay in the battery management system is closed. At this time, the power battery 121 can supply power to the high-voltage power distribution component 122. The vehicle controller or low-voltage battery manager 112 can monitor the battery voltage of the low-voltage battery 111 in real time when the vehicle 100 is in a high-voltage power-on state.

[0043] Step S20: When the battery voltage is lower than the first voltage threshold, a request command is sent to the DC-DC converter and the timer is started.

[0044] The first voltage threshold is less than the normal operating voltage of the low-voltage battery 111. For example, if the normal operating voltage of the low-voltage battery is 12V, then the first voltage threshold is less than 12V. For example, the first voltage threshold can be 11.5V, 11V, etc.

[0045] Specifically, the DC controller 1132 in the DC-DC converter 113 can receive request commands, and then the DC controller 1132 controls the DC-DC converter circuit 1131 to convert the electrical energy provided by the power battery into voltage to power the low-voltage battery. Of course, the voltage output by the DC controller 1132 after controlling the DC-DC converter circuit 1131 to perform voltage conversion according to the request commands can also be directly used to power the low-voltage equipment 114.

[0046] A timer can include predefined timing parameters and related software programs. The timing value is the specific numerical value of the timing parameter. The timing process is achieved by executing the related software program. After the timer is triggered, it enters the corresponding timing program, thereby generating the corresponding timing value. This timing value can be 0 or other timing values, depending on the actual timing value obtained.

[0047] Step S30: When the timer reaches the preset duration and the battery voltage is still lower than the first voltage threshold, output the first prompt message to the vehicle's display instrument.

[0048] If the battery voltage remains below the first voltage threshold after the timer reaches a preset duration, it indicates that the request for the DC-DC converter to supply power to the low-voltage battery has failed. A first notification message is displayed on the vehicle's instrument panel to indicate an abnormal low-voltage battery supply / voltage, reminding the user that the low-voltage battery 111 is in an abnormal state. The preset duration can be set according to actual application requirements, such as the response speed of the DC-DC converter 113 to the request command and its speed of adjusting the output voltage.

[0049] In this embodiment, when the battery voltage of the low-voltage battery 111 is detected to be lower than the first voltage threshold, the device first attempts to request the DC-DC converter 113 to supply power to the low-voltage battery 111. When the DC-DC converter 113 fails to supply power to the low-voltage battery 111, a first prompt message is output to the user that the low-voltage battery 111 of the vehicle 100 is in an abnormal state. The user can stop the vehicle in time after being reminded by the first prompt message, and check and repair the low-voltage battery 111 to prevent the vehicle 100 from being abnormally powered off due to the automatic disconnection of the low-voltage battery 111's power supply. Understandably, when the timer reaches the preset duration and the battery voltage remains below the first voltage threshold, vehicle 100 can still maintain its high-voltage power-on state and continue normal operation. However, the user can control vehicle 100 to pull over to the side of the road based on the first reminder information.

[0050] If the battery voltage is greater than the first voltage threshold, it means that the request for DC-DC converter 113 to supply power to the low-voltage battery has been successful. At this time, the vehicle 100 can operate normally, so there is no need to output the first reminder information, which can reduce abnormal power-off of the vehicle 100 and unnecessary reminders.

[0051] In some embodiments, such as Figure 3 As shown, step S20 may include the following steps: Step S21: When the battery voltage is lower than the first voltage threshold, send a first request command to the DC-DC converter and start the timer.

[0052] The DC-DC converter 113 refreshes its internal control signals according to the first request command to restart voltage conversion. Specifically, when the DC controller 1132 receives the first request command, it can refresh the drive signal sent to the DC-DC converter 1131 according to the first request command. For example, when the DC controller 1132 receives the first request command, it determines whether the DC-DC converter 1131 is in an operating state. If the DC-DC converter 1131 is in a sleep state, the DC controller 1132 starts sending drive signals to the DC-DC converter 1131. If the DC-DC converter 1131 is in an operating state, the DC controller 1132 can send a rising edge drive signal to the DC-DC converter 1131 to trigger the DC-DC converter 1131 to restart voltage conversion and supply power to the low-voltage battery 111. It can be understood that even if the DC-DC converter 1131 is in a sleep state, the drive signal initially sent by the DC controller 1132 to the DC-DC converter 1131 can also be a rising edge level signal to trigger the DC-DC converter 1131 to switch from a sleep state to an operating state.

[0053] Step S22: When the timer reaches the first preset duration and the battery voltage is still lower than the first voltage threshold, a second request command is sent to the DC-DC converter.

[0054] The DC-DC converter 113 is reset and restarted according to the second request command. Specifically, when the DC controller 1132 receives the second request command, it controls itself and the DC-DC converter 1131 to reset and restart according to the second request command, so as to restart the DC-DC converter 1131 to perform voltage conversion and supply power to the low-voltage battery 111.

[0055] If the battery voltage is still lower than the first voltage threshold after the timer has been powered off for a certain period of time, it means that refreshing the drive signal to the DC-DC converter 1131 cannot restore the DC-DC converter 1131 to work. Then, the DC-DC converter 113 will be reset and restarted again to try to restore the DC-DC converter 113 to work and provide power to the low-voltage battery 111.

[0056] In this embodiment, when the battery voltage is lower than a first voltage threshold, a refresh internal control signal with minimal impact on the system is first used to attempt to request the DC-DC converter 113 to supply power to the low-voltage battery. If the request fails, and the battery voltage is still lower than the first voltage threshold when the timer's count reaches the first preset threshold, a second request command is sent to the DC-DC converter 113 to attempt to reset and restart the DC-DC converter 113 to supply power to the low-voltage battery 111. By using layered request processing, the DC-DC converter 113 is requested to supply power to the low-voltage battery 111 as much as possible, which can maximize the normal operation of the vehicle 100, reduce the possibility of the vehicle 100 losing power due to abnormal power supply to the low-voltage battery 111, and reduce the impact of abnormal power supply to the low-voltage battery 111.

[0057] Correspondingly, step S30 may include: Step S31: When the timing value reaches the second preset duration and the battery voltage is still lower than the first voltage threshold, output the first prompt information to the display instrument.

[0058] The second preset duration is longer than the first preset duration. If the battery voltage remains below the first voltage threshold after the second preset duration has elapsed, it indicates that the DC-DC converter 113 cannot resume operation. In this case, a first prompt message is output to the display instrument to remind the user that the low-voltage battery 111 is in an abnormal state.

[0059] In this embodiment, when the voltage of the low-voltage battery 111 is low, the DC-DC converter 113 can be actively attempted to supply power to the low-voltage battery 111. If the DC-DC converter 113 is requested to supply power to the low-voltage battery 111 twice, the first prompt message is output to the display instrument to remind the user that the low-voltage battery 111 is not powered. This can improve the accuracy of the low-voltage battery 111 power supply abnormality reminder and reduce abnormal power failure of the vehicle 100 and unnecessary reminders.

[0060] like Figure 4 As shown, in some embodiments, the control method may further include: Step S40: When the battery voltage is lower than the second voltage threshold, control the output power of the power battery to be less than or equal to the preset power.

[0061] The second voltage threshold is lower than the first voltage threshold. When the battery voltage is lower than the second voltage threshold, it indicates that the voltage of the low-voltage battery 111 has further decreased. At this time, for the safety of the entire vehicle, the output power of the power battery 121 is controlled to be less than or equal to a preset power, and the output power of the power battery 121 is limited to or below the preset power, so that the vehicle 100 can operate with reduced power, thereby reducing the speed of the vehicle 100.

[0062] In a specific example, the output power of the power battery 121 is limited to a preset power, and the vehicle speed of the vehicle 100 can be limited to below 30 km / h or below 60 km / h. Of course, this application does not impose any restrictions on this, and it can be set according to actual needs.

[0063] Step S50: Output the second prompt message to the display instrument.

[0064] The second notification message indicates that the voltage of the low-voltage battery 111 is too low. By outputting the second notification message to the display instrument, the user can be promptly reminded that the voltage of the low-voltage battery 111 is too low, allowing the user to stop the vehicle in time.

[0065] In this embodiment, by setting a first voltage threshold and a second voltage threshold, when the battery voltage of the low-voltage battery 111 is too low, the system prioritizes requesting the DC-DC converter 113 to supply power to the low-voltage battery 111, rather than directly cutting off power or limiting power, thereby reducing unnecessary breakdowns of the vehicle 100. If the request fails, measures are taken to control the vehicle 100 to reduce power consumption, and a prompt message is output to remind the user, allowing the user buffer time to pull over, thereby improving the safety of the vehicle 100 and enhancing the user experience. In some embodiments, such as Figure 5 As shown, the control method may also include: Step S60: When the battery voltage is lower than the third voltage threshold, control the vehicle to perform the high-voltage power-off procedure and control the low-voltage battery to disconnect.

[0066] Specifically, when the battery voltage is below the third voltage threshold, the low-voltage battery is in an over-discharge state. This third voltage threshold is understood to be lower than the second voltage threshold. When the battery voltage of low-voltage battery 111 is below the third voltage threshold, it is in an over-discharge state. If low-voltage battery 111 continues to discharge at this time, it may suddenly fail to discharge and thus fail to supply power to low-voltage equipment, causing an abnormal power outage of vehicle 100. Therefore, when the battery voltage is detected to be below the third voltage threshold, the vehicle 100 is directly controlled to execute a high-voltage power-down procedure, simulating the normal power-down process of vehicle 100, and controlling the power outage of low-voltage battery 111 to ensure the safe power-down of vehicle 100 and prevent damage to low-voltage battery 111 from continued discharge. Here, the high-voltage power-down procedure of vehicle 100 is consistent with the normal power-down procedure of vehicle 100.

[0067] In this embodiment, by setting a first voltage threshold, a second voltage threshold, and a third voltage threshold, a three-level gradient protection for the low-voltage battery 111 is achieved, corresponding to the three gradient protection actions of "attempting to restore power", "reducing speed and issuing a warning", and "forced parking". Compared with the single protection strategy of "directly shutting down the low-voltage battery when it is undervoltage", the three-level gradient protection can reduce unnecessary breakdowns and provide users with a buffer time to pull over. The low-voltage battery 111 will only trigger the high-voltage power-down process of the vehicle 100 when the battery voltage continuously drops to the third voltage threshold, so that the low-voltage battery 111 can achieve the goal of "restoring power if it can restore power on its own, and safely parking if it cannot restore power".

[0068] Furthermore, the control methods may also include: Step S70: Monitor the vehicle speed in real time while the vehicle is performing the high-voltage power-off process.

[0069] When vehicle 100 performs the high-voltage power-off process, the speed of vehicle 100 will gradually decrease until it drops to zero and vehicle 100 stops.

[0070] Step S80: When the vehicle speed is less than the preset speed, set the lock bag flag.

[0071] When the lock flag is set, the low-voltage battery 111 remains de-energized. In this embodiment, the preset speed can be set to a value close to zero, or it can be set to zero. Thus, by setting the lock flag to keep the low-voltage battery 111 de-energized, it prevents the user from restarting the vehicle 100, which could cause the low-voltage battery 111 to continue discharging, damaging it or reducing its lifespan.

[0072] like Figure 6 As shown, step S60, "controlling the vehicle to perform the high-voltage power-down procedure," may include: Step S61: Switch the vehicle key status from the on state to the off state.

[0073] The key status of vehicle 100 can include KeyOn, KeyOff, and KeyReady. In this embodiment, when the battery voltage of low-voltage battery 111 is detected to be lower than the third voltage threshold, the key status of vehicle 100 is switched from KeyOn to KeyOff, and vehicle 100 enters the high-voltage power-off process.

[0074] Step S62: Control the vehicle's high-voltage power distribution system to stop working.

[0075] When the key status of vehicle 100 changes from KeyOn to KeyOff, the vehicle controller controls the operating mode and power of each high-voltage component in the high-voltage power distribution system of vehicle 100 to reduce the overall high-voltage current and voltage, and to discharge each high-voltage component, consuming energy from the vehicle's high-voltage wiring harness, further reducing the overall high-voltage current and voltage. When the battery management system of the power battery detects that the overall high-voltage current and voltage have dropped to a certain threshold, it disconnects the main relay, and the vehicle controller issues a sleep command to each high-voltage component, thus stopping the high-voltage power distribution system from operating.

[0076] Step S63: Control the vehicle to park.

[0077] When the key status of vehicle 100 changes from KeyOn to KeyOff, the vehicle controller also controls the electronic parking system of vehicle 100 to switch to the parking position.

[0078] In this embodiment, when the battery voltage is detected to be lower than the third voltage threshold, the key state of the vehicle is switched from the on state KeyOn to the off state KeyOff, the high-voltage power distribution system is stopped, and the vehicle 100 is switched to the parking position. This ensures that when the voltage of the low-voltage battery 111 is too low, the high voltage of the vehicle is safely de-energized, and the electronic parking brake of the vehicle 100 is engaged before the low-voltage battery 111 is completely de-energized, so as not to cause the risk of the vehicle rolling away, thus ensuring the safety of the vehicle 100.

[0079] This application also provides an electronic device, please refer to... Figure 7 It includes a processor 210 and a memory 220, wherein the memory 210 is used to store computer programs; the processor 220 is used to execute the programs stored in the memory 210 to implement the control method described in any embodiment of this application.

[0080] This application also provides a vehicle 100, including the aforementioned electronic device 200.

[0081] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the control method described in any embodiment of this application.

[0082] In this application, "multiple" refers to two or more.

[0083] In this application, unless otherwise expressly defined, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0084] The terms “first,” “second,” “third,” “fourth,” etc., in this application (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0085] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0086] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, if the method includes steps A and B, it means that the method may include steps A and B performed sequentially, or it may include steps B and A performed sequentially. For example, if the method may also include step C, it means that step C may be added to the method in any order. For example, the method may include steps A, B, and C, or it may include steps A, C, and B, or it may include steps C, A, and B, etc.

[0087] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for controlling a vehicle, the vehicle comprising a power battery, a low-voltage battery, and a DC-DC converter, wherein the power battery is connected to the input terminal of the DC-DC converter, and the output terminal of the DC-DC converter is connected to the low-voltage battery, characterized in that, The control method includes: When the vehicle is in a high-voltage power-on state, monitor the battery voltage of the low-voltage battery; When the battery voltage is lower than the first voltage threshold, a request command is sent to the DC-DC converter and the timing of the timer is started; wherein, the DC-DC converter converts the electrical energy provided by the power battery into voltage according to the request command and supplies power to the low-voltage battery. When the timer reaches a preset duration and the battery voltage is still lower than the first voltage threshold, a first prompt message is output to the vehicle's display instrument panel; wherein, the first prompt message is used to indicate that the low-voltage battery is malfunctioning.

2. The method according to claim 1, characterized in that, When the battery voltage is lower than a first voltage threshold, sending a request command to the DC-DC converter and starting the timer includes: When the battery voltage is lower than the first voltage threshold, a first request command is sent to the DC-DC converter, and the timing of the timer is started; wherein, the DC-DC converter refreshes its internal control signal according to the first request command to restart the voltage conversion. When the timer reaches the first preset duration and the battery voltage is still lower than the first voltage threshold, a second request instruction is sent to the DC-DC converter; wherein the DC-DC converter is reset and restarted according to the second request instruction.

3. The method according to claim 2, characterized in that, When the timer reaches a preset duration and the battery voltage is still below the first voltage threshold, outputting a first prompt message to the vehicle's display instrument panel includes: When the timing value reaches the second preset duration and the battery voltage is still lower than the first voltage threshold, the first prompt message is output to the display instrument; wherein, the second preset duration is longer than the first preset duration.

4. The method according to any one of claims 1 to 3, characterized in that, Also includes: When the battery voltage is lower than a second voltage threshold, the output power of the power battery is controlled to be less than or equal to a preset power; wherein, the second voltage threshold is lower than the first voltage threshold. Output a second prompt message to the display instrument; wherein the second prompt message is used to indicate that the battery voltage of the low-voltage battery is too low.

5. The method according to any one of claims 1 to 3, characterized in that, Also includes: When the battery voltage is lower than the third voltage threshold, the vehicle is controlled to perform a high-voltage power-down procedure and the low-voltage battery is controlled to disconnect from power; wherein, when the battery voltage is lower than the third voltage threshold, the low-voltage battery is in an over-discharge state.

6. The method according to claim 5, characterized in that, Also includes: The vehicle speed is monitored in real time during the high-voltage power-down process. When the vehicle speed is less than the preset speed, the lock bag flag is set; wherein, when the lock bag flag is set, the low-voltage battery remains de-energized.

7. The method according to claim 5, characterized in that, The process of controlling the vehicle to perform a high-voltage power-off includes: Switch the vehicle's key status from the on state to the off state; The high-voltage power distribution system of the vehicle is controlled to stop working; Control the vehicle to park.

8. An electronic device, characterized in that, Including processor and memory, among which Memory, used to store computer programs; A processor for executing a program stored in memory to implement the method described in any one of claims 1-7.

9. A vehicle, characterized in that, Includes the electronic device as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method described in any one of claims 1-7.

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