Vehicle control method, medium, controller and vehicle

Abstract

The present disclosure relates to the technical field of vehicle maintenance control, and relates to a vehicle control method, a medium, a controller and a vehicle. The method comprises: obtaining vehicle status information in response to power-off control of a high-voltage system of the vehicle; determining that the vehicle meets maintenance safety conditions according to the vehicle status information; and controlling power-off of a low-voltage system of the vehicle to improve the efficiency and safety of vehicle maintenance.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle maintenance control, and in particular, to a vehicle control method, a medium, a controller and a vehicle. Background Art

[0002] Currently in the new energy field, the number of electric vehicles is gradually increasing. When repairing a faulty vehicle, it is crucial for the safety of both the maintenance personnel and the vehicle itself to keep the vehicle's low-voltage system and high-voltage system completely powered off.

[0003] In the related art, when a vehicle is being repaired, usually only the high-voltage power supply is disconnected, and the low-voltage power supply remains powered. However, at this time, a power failure may still occur between the main negative contactors of the vehicle's high-voltage power supply, causing potential danger. In addition, if the maintenance personnel manually remove the negative grounding wire of the low-voltage power supply, not only is the operation cumbersome, but it may also cause poor contact of the low-voltage power supply, thereby causing the vehicle to be unable to power on. Summary of the invention

[0004] The object of the present disclosure is to provide a vehicle control method, the method comprising:

[0005] acquiring vehicle status information in response to power-off control of a high voltage system of the vehicle;

[0006] Determining, according to the vehicle status information, that the vehicle meets a maintenance safety condition;

[0007] The low voltage system controlling the vehicle is de-energized.

[0008] Optionally, controlling the low-voltage system of the vehicle to be powered off includes:

[0009] A low voltage power-off instruction is sent to a second controller of the vehicle through the first controller of the vehicle to trigger the second controller to control the second control switch of the low voltage system to be disconnected.

[0010] Optionally, the vehicle status information includes the speed of the vehicle and the collision fault status of the vehicle, and determining that the vehicle meets the maintenance safety condition according to the vehicle status information includes:

[0011] When the speed of the vehicle is lower than a preset vehicle speed threshold and the collision fault state is that no collision fault occurs, it is determined that the vehicle meets the maintenance safety condition.

[0012] Optionally, the method further comprises:

[0013] Acquiring a collision fault signal of the vehicle and a device detection signal of a collision safety device of the vehicle;

[0014] When the collision fault signal is not detected and the detection signal of the device indicates no abnormality, determining that the collision fault state of the vehicle is that no collision has occurred;

[0015] When the collision fault signal is detected, or the device detection signal indicates an abnormality, the collision fault state of the vehicle is determined to be a collision.

[0016] Optionally, the collision safety device includes a collision hard line and an airbag system, and the method further includes:

[0017] Testing the collision hard line and the airbag system;

[0018] If the collision hard line and the airbag system are both normal, the device detection signal indicates that there is no abnormality;

[0019] If any one of the collision hard line and the airbag system is abnormal, the device detection signal indicates the abnormality.

[0020] Optionally, the method further comprises:

[0021] In response to a high level signal triggered by a third control switch of the vehicle, a second control switch of the low voltage system is controlled by a second controller of the vehicle to close, so as to restore power supply to the low voltage system of the vehicle.

[0022] Optionally, the method further comprises:

[0023] After the low-voltage system of the vehicle resumes power supply, performing a power-on test on the vehicle;

[0024] If the vehicle is not powered on within a preset time, disconnecting the power supply to the low-voltage system;

[0025] If the vehicle is powered on within the preset time period, the power supply to the low-voltage system is maintained.

[0026] Optionally, the method further comprises:

[0027] When the low-voltage system of the vehicle remains powered and there is no abnormality in the high-voltage interlock state of the vehicle, in response to the first control switch of the vehicle being closed, power supply to the high-voltage system of the vehicle is restored.

[0028] Optionally, controlling the low-voltage system of the vehicle to be powered off includes:

[0029] The electric energy in the high-voltage system is discharged until the bus voltage of the high-voltage system is lower than a preset voltage threshold, and then the electric energy discharge is stopped and the power supply to the low-voltage power supply system is shut down.

[0030] Optionally, in response to controlling the power-off of the high-voltage system of the vehicle, obtaining the vehicle status information includes:

[0031] Monitoring the on / off state of a first control switch of the high-voltage system by a first controller of the vehicle;

[0032] In response to the first control switch of the high-voltage system being disconnected, the vehicle status information is acquired through the first controller.

[0033] The present disclosure also provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the vehicle control method provided by the present disclosure is implemented.

[0034] The present disclosure also provides a controller, comprising:

[0035] a memory having a computer program stored thereon;

[0036] A processor is used to execute the computer program in the memory to implement the vehicle control method provided by the present disclosure.

[0037] The present disclosure also provides a vehicle, comprising a processor and a controller provided by the present disclosure.

[0038] Through the above technical solution, the low-voltage system and high-voltage system of the vehicle are controlled in linkage, and the low-voltage system is disconnected at the same time after the high-voltage system is disconnected, which simplifies the maintenance power-off process and avoids the tedious maintenance process of manually removing the negative grounding wire of the low-voltage system, thereby improving the efficiency and safety of vehicle maintenance.

[0039] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0041] Figure 1 It is a flow chart of a vehicle control method proposed by an exemplary embodiment of the present disclosure.

[0042] Figure 2 It is a schematic diagram of a vehicle control system proposed by an exemplary embodiment of the present disclosure.

[0043] Figure 3 It is a flow chart of a vehicle power-off control proposed by an exemplary embodiment of the present disclosure.

[0044] Figure 4It is a block diagram of a vehicle control device proposed by an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0046] Figure 1 is a flow chart of a vehicle control method proposed by an exemplary embodiment of the present disclosure, see Figure 1 As shown, the following steps are included.

[0047] In step S11 , in response to power-off control of a high-voltage system of the vehicle, vehicle state information is acquired.

[0048] In one embodiment, the high-voltage system includes a high-voltage power supply, and the low-voltage system includes a low-voltage power supply. The high-voltage power supply can be a power battery pack of the vehicle, which is used to supply power to the low-voltage power supply of the vehicle and various high-voltage components in the high-voltage system, such as the main power components of the vehicle. The low-voltage power supply is also called a 12V small battery, which is used to store the electrical energy provided by the high-voltage power supply and supply power to various low-voltage components in the low-voltage system of the vehicle, such as the vehicle's lighting system, ignition system, display system, etc.

[0049] For example, before a vehicle is repaired, it is necessary to power off the vehicle. To ensure the safety of the power-off process, the high-voltage system is usually disconnected first, that is, the power supply of the power battery to the high-voltage components in the high-voltage system is disconnected. The power-off control of the high-voltage system can be achieved through at least one of the vehicle's maintenance control switch, maintenance control button or circuit breaker, wherein the vehicle's maintenance control switch or maintenance control button can be a physical component or a virtual component. For example, maintenance personnel can control the on and off of the vehicle's high-voltage system through the virtual button corresponding to the maintenance control switch in the vehicle control panel.

[0050] After the power supply of the high-voltage system is cut off, the vehicle status information is obtained to determine whether the high-voltage system of the vehicle is powered off accidentally, thereby ensuring the safety of the vehicle and maintenance personnel.

[0051] In step S12, it is determined whether the vehicle meets maintenance safety conditions according to the vehicle status information.

[0052] In one embodiment, the maintenance safety condition of the vehicle includes at least one of the following: the vehicle has no collision fault, the HVIL (High Voltage Inter-lock) state is normal, the vehicle is in a parking state, and each high voltage component in the high voltage system has been fully discharged.

[0053] In step S13, the low-voltage system of the vehicle is controlled to be powered off.

[0054] In one implementation, once it is determined that the vehicle meets the maintenance safety conditions, the low-voltage system of the vehicle is automatically powered off to avoid manual intervention in the power-off operation.

[0055] Through the above method, linkage control of the low-voltage system and the high-voltage system of the vehicle is achieved. When the high-voltage system is disconnected, the low-voltage system is also disconnected at the same time, which simplifies the maintenance power-off process and avoids the tedious maintenance process of manually removing the negative grounding wire of the low-voltage system, thereby improving the efficiency and safety of vehicle maintenance.

[0056] In one embodiment, the vehicle includes a vehicle control system, see Figure 2 As shown, the system includes a high voltage system, a low voltage system, a first controller, a second controller, a first control switch, a battery pack management system and a collision safety device.

[0057] The low voltage system further includes a second control switch for controlling the on and off of the low voltage. The second control switch may be a MOS (Metal-Oxide-Semiconductor) tube in the low voltage power supply.

[0058] It is worth noting that the first control switch can disconnect the power supply to the vehicle's high-voltage system when the vehicle needs maintenance. The first control switch is also called a low-voltage maintenance switch. The low-voltage maintenance switch controls the on and off of the high-voltage power supply in the high-voltage system through a loop, thereby controlling the on and off of the high-voltage system.

[0059] See also Figure 2 As shown, the first control switch controls the on and off of the high-voltage system through a loop, the second controller controls the on and off of the low-voltage system through the second control switch loop of the low-voltage power supply, the first controller is connected to the first control switch through internal communication, the first controller is communicated with the second controller, the collision safety device and the battery pack management system through CAN (Controller Area Network) lines, and the first controller is hard-wired to the collision safety device, and the collision safety device is also communicated with the battery pack management system and the second controller through CAN lines.

[0060] Among them, the battery pack management system includes BCM (Body Control Module) and BASU (Battery Actuation and Sampling Unit). The first controller can be VCU (Vehicle Control Unit) or PDC (Power Domain Controller), and the second controller can be LBMS (Low Battery Management System), which is used to control the on and off of the low-voltage power supply, thereby controlling the on and off of the low-voltage system circuit.

[0061] It is worth mentioning that the low-voltage maintenance switch is not only used to control the vehicle's high-voltage system, but also to activate the vehicle's maintenance mode. When the low-voltage maintenance switch is disconnected, the vehicle enters the maintenance mode. When the low-voltage maintenance switch is turned on, the vehicle exits the maintenance mode. When the vehicle enters the maintenance mode, the vehicle's high-voltage hard-wire interlock will be activated to ensure the safety of maintenance personnel.

[0062] In one embodiment, the first controller detects the on and off state of the first control switch in real time. If it is detected that the first controller is disconnected, that is, the user operates the first control switch to disconnect to control the high-voltage system of the vehicle to be powered off, and the vehicle activates the maintenance mode, the first controller sends a low-voltage power-off instruction to the second controller. After receiving the low-voltage power-off instruction, the second controller controls the second control switch in the low-voltage power supply to disconnect to achieve power off of the low-voltage system.

[0063] For example, the vehicle controller inspects the status of the low-voltage maintenance switch. When the PDC detects that the low-voltage maintenance switch is disconnected, that is, the circuit of the high-voltage system is disconnected, the PDC obtains vehicle status information, such as the vehicle's high-voltage hardware interlock status, vehicle speed, collision fault signal, the status of the high-voltage battery and the low-voltage battery, and the status of each component in the high-voltage system, to determine whether the vehicle meets the safety maintenance conditions based on the vehicle status information. The PDC sends the judgment result to the LBMS via the CAN line. At the same time, the collision safety device self-checks and sends the self-check result to the LBMS in the form of a message. The LBMS verifies the vehicle status detection result sent by the PDC through the self-check message of the collision safety device. If the verification passes and the vehicle has entered the maintenance mode, the LBMS controls the low-voltage power supply to be powered off, so that only the low-voltage maintenance switch needs to be controlled, and the vehicle's low-voltage system will be powered off together with the high-voltage system.

[0064] Through the above method, the low-voltage system is disconnected after the high-voltage system is disconnected, which ensures that no power failure occurs between the main negative contactors of the vehicle's high-voltage power supply in terms of circuit structure, thereby improving the efficiency and safety of vehicle maintenance.

[0065] Optionally, the vehicle status information includes the speed and collision fault status of the vehicle.

[0066] In one implementation, when the speed of the vehicle is lower than a preset vehicle speed threshold and the collision fault state is that no collision fault has occurred, it is determined that the vehicle meets the maintenance safety condition.

[0067] For example, safe maintenance conditions include the following two points.

[0068] First, the vehicle cannot be in motion.

[0069] It is worth noting that when the vehicle is in driving, if the first controller misjudges the on / off state of the first control switch and mistakenly enters the maintenance mode and disconnects the low-voltage system, it may cause the vehicle's power system to fail during driving, causing the vehicle to break down or cause an accident. Therefore, the vehicle needs to be parked or in a low-speed state to enter the maintenance mode. For example, when the vehicle is being repaired after a minor collision, the vehicle speed is less than the set speed threshold.

[0070] Second, the vehicle did not have any collision failure.

[0071] It is worth mentioning that after a collision occurs, in order to ensure the safety of the passengers in the vehicle, the BCM (Body Control Module) in the vehicle's low-voltage circuit needs to automatically unlock the doors and windows and half-lower the four-door windows to provide an escape route for the passengers in the vehicle. If the first control switch is accidentally disconnected after a collision occurs, and the maintenance mode is mistakenly entered and the low-voltage system is disconnected, the BCM will not be able to control the windows and doors. Therefore, for the vehicle to meet the maintenance safety conditions, the collision fault state of the vehicle requires that the vehicle has not failed.

[0072] Through the above method, the safety of the vehicle can be improved, and the danger caused by the vehicle mistakenly entering the maintenance mode or mistakenly disconnecting the low-voltage system can be avoided.

[0073] Optionally, judging whether the vehicle enters the maintenance mode according to the vehicle speed and the collision fault state includes:

[0074] When the vehicle speed is lower than the preset speed threshold and the collision fault state is that no collision fault has occurred, it is determined that the vehicle meets the maintenance safety conditions and enters the maintenance mode.

[0075] When the vehicle speed is not lower than the preset vehicle speed threshold, or the collision fault state is a collision fault, it is determined that the vehicle does not meet the maintenance safety conditions and the maintenance mode is not entered.

[0076] In one embodiment, see Figure 3As shown, the preset vehicle threshold is 3km / h, and the vehicle controller inspects the status of the low-voltage maintenance switch. If the vehicle controller detects that the low-voltage maintenance switch is disconnected, the circuit of the high-voltage system is disconnected, but the circuit of the low-voltage system is not disconnected, and the main negative contactor of the power battery pack still has a mispower supply condition. The vehicle controller obtains the vehicle speed and detects the collision fault signal of the vehicle to determine whether the vehicle meets the maintenance safety conditions. If the vehicle speed is greater than 3km / h, it means that the vehicle is in a driving state. If the vehicle does not meet the maintenance safety conditions, the circuit of the low-voltage system is continuously disconnected. If the vehicle speed is less than or equal to 3km / h, it means that the vehicle is in a parking state or a low-speed state, then the collision fault state of the vehicle is further detected.

[0077] The above method can avoid the accidental disconnection of the power supply to the low-voltage system when the vehicle is in driving state, thereby improving the safety and reliability of the vehicle.

[0078] Optionally, the method further comprises:

[0079] A collision fault signal of the vehicle and a device detection signal of a collision safety device of the vehicle are obtained.

[0080] When no collision fault signal is detected and the device detection signal indicates no abnormality, it is determined that the collision fault state of the vehicle is that no collision has occurred.

[0081] When a collision fault signal is detected, or a device detection signal indicates an abnormality, the collision fault state of the vehicle is determined to be a collision.

[0082] Among them, the collision fault signal is also called the collision fault code. The vehicle will trigger the collision fault code due to actual collision, low-speed collision, strong vibration, sensor failure, electrical failure, software failure, etc.; the collision safety device includes SRS (Supplemental Restraint System, airbag system), collision sensor, collision hard wire, seat belt sensor and engine controller. The device detection signal includes the self-test signal of multiple collision safety devices in the vehicle, and the detection signal of the communication function between the collision safety device and other vehicle systems.

[0083] Continue to use the above embodiment for description, see Figure 3 As shown, when the vehicle speed is less than or equal to 3km / h, the PDC first determines whether a collision fault code is received. If received, it determines that the vehicle is not disconnected from the low-voltage system. If not, the vehicle speed and the vehicle status detection results of the collision fault are sent to the LBMS. At the same time, the LMBS obtains the device detection signal of the collision safety device to verify the vehicle status detection result sent by the PDC through the device detection signal to ensure that the vehicle has not sent a fault.

[0084] Optionally, the collision safety device includes a collision hard line and an airbag system, and the method further includes:

[0085] The collision hard line and the airbag system are tested.

[0086] It is worth mentioning that the collision hard line is used to connect the SRS and the collision sensor. When the vehicle collides, the collision sensor transmits the detected impact signal to the SRS through the collision hard line. The SRS chooses to trigger or not trigger the airbag according to the strength of the received impact signal.

[0087] If there is no abnormality in the collision hard line and the airbag system, the device detection signal indicates no abnormality.

[0088] If any one of the collision hard line and the airbag system is abnormal, the device detection signal indicates the abnormality.

[0089] In one embodiment, if the vehicle does not detect a collision fault signal, it is also necessary to determine whether the vehicle's collision safety device is abnormal. For example, a collision sensor in the SRS fails, which may cause the vehicle to fail to detect a collision fault that has occurred, and thus fail to trigger a collision fault signal. For example, a collision hard line short-circuits or opens, but due to a communication failure in the SRS, the collision signal is not triggered. Therefore, even if a collision fault signal is not detected, the vehicle's collision safety device needs to be tested to ensure that the vehicle has not experienced a collision fault.

[0090] In one embodiment, when determining whether a vehicle meets maintenance safety conditions, each collision safety device will perform a self-test and send the self-test signal to the LBMS in the form of a message via the CAN line. The LBMS determines whether the vehicle enters the maintenance mode based on the device detection signals sent from multiple collision safety devices and the vehicle status detection results sent from the vehicle controller. When there is no abnormality in each collision safety device and the vehicle status detection results sent by the vehicle controller indicate that the vehicle can enter the maintenance mode, the LMBS controls the disconnection of the vehicle's low-voltage system circuit.

[0091] Through the above method, the safety of the vehicle can be improved, potential dangers caused by failure of the collision safety device of the vehicle can be avoided, and the safety and reliability of power-off control of the vehicle can be improved.

[0092] Optionally, the vehicle further includes a third control switch, the third control switch being communicatively connected to the second controller, and the method further includes:

[0093] In response to the high level signal triggered by the third control switch, the second control switch is controlled by the second controller to be closed, so as to restore power supply to the low voltage system of the vehicle.

[0094] In one embodiment, the third control switch may be a micro-control switch. After the high-voltage system and the low-voltage system of the vehicle are completely disconnected, the power supply to the high-voltage system and the low-voltage system may be restored through the micro-control switch to cope with various maintenance conditions.

[0095] For example, after the vehicle's high-voltage system and low-voltage system are completely disconnected, the LBMS will inspect whether there is a high-level signal. When the micro-control switch is pressed, a preset high-level signal will be triggered, and the LBMS will control the MOS tube of the low-voltage power supply to be turned on to restore power to the low-voltage system.

[0096] Optionally, the method further comprises:

[0097] After the low-voltage system of the vehicle resumes power supply, a power-on detection is performed on the vehicle.

[0098] It is worth noting that the power-on detection of the vehicle is to detect the key status of the vehicle, where the key status includes ON and OFF positions. Maintenance personnel can switch the key status of the vehicle by switching the gear position of the vehicle key or pressing the vehicle start button.

[0099] If the vehicle is not powered on within a preset time, the power supply to the low-voltage system is disconnected.

[0100] If the vehicle is powered on within a preset time, the low-voltage system is powered on.

[0101] Continue to use the above embodiment for description, see Figure 3 As shown, after LBMS receives the high-level signal triggered by the user-controlled micro-control switch, it controls the second control switch to close to restore the power supply of the low-voltage system, and detects the key status of the vehicle. If the vehicle is not powered on within the preset time, that is, the key status of the vehicle remains in the OFF position, then after the preset time, the power supply to the low-voltage system is disconnected again, or the low-voltage battery is controlled to enter a low-power consumption mode. If the vehicle is powered on within the preset time, that is, the key status of the vehicle is switched to the ON position, then after the preset time, the power supply to the low-voltage system circuit is maintained, and the preset time can be set to 30 seconds.

[0102] Through the above method, after shutting down the high-voltage system and low-voltage system of the vehicle, the power supply to the low-voltage system circuit can be restored through the micro-control switch to meet diverse maintenance needs, avoid the danger caused by accidental touching of the micro-control switch, and improve the safety of the vehicle maintenance process.

[0103] In one embodiment, see Figure 3 As shown, the power-off control method for repairing a vehicle includes the following steps.

[0104] S201. Provide or restore power supply to the high voltage system.

[0105] If the high-voltage system is not powered off, the power supply to the high-voltage system is maintained, and if the high-voltage system is powered off, the power supply to the high-voltage system is restored. After the high-voltage system starts to supply power, S202 is executed.

[0106] S202: Determine the status of the low-voltage maintenance switch.

[0107] If the low-voltage maintenance switch is disconnected, execute S203; if the low-voltage maintenance switch is not disconnected, return to execute S201.

[0108] S203, control the high voltage system to cut off power.

[0109] After the high voltage system is powered off, S204 is further executed.

[0110] S204: Determine that the speed of the vehicle does not exceed a preset vehicle speed threshold.

[0111] The preset vehicle speed threshold is 3 km / h. If the vehicle speed does not exceed 3 km / h, S205 is executed. If the vehicle speed exceeds 3 km / h, S211 is executed.

[0112] S205: Determine whether a collision fault signal is detected.

[0113] If a collision fault signal is detected, S211 is executed; if no collision fault signal is detected, S206 is executed.

[0114] S206: Determine that the collision hard line and SRS are not faulty.

[0115] If both the collision hard line and the SRS are not faulty, then S207 is executed. If either the collision hard line or the SRS is faulty, then S211 is executed.

[0116] S207. Discharge the electrical energy stored in the high-voltage system.

[0117] After the electric energy discharge starts, S208 is executed.

[0118] S208: Determine whether the bus voltage of the power motor is lower than a preset voltage threshold.

[0119] Among them, the preset voltage threshold is 60V. If the bus voltage of the power motor is less than 60V, it is determined that the power discharge of the high-voltage system is completed, the power discharge is stopped and S209 is executed. If the bus voltage of the power motor is greater than or equal to 60V, it is determined that the power discharge of the high-voltage system is not completed or the discharge has timed out, then it returns to execute S207 to re-discharge the power of the high-voltage system.

[0120] S209, control the low voltage system to cut off power.

[0121] Execute 210 after the low voltage system is powered off.

[0122] S210, determining whether a micro switch is triggered.

[0123] The micro switch is a micro control switch, and whether the micro switch is triggered is continuously detected. If triggered, S211 is executed, and if not triggered, the process returns to S209 for execution.

[0124] S211. Provide or restore power supply to the low voltage system.

[0125] If the low-voltage system is powered off, the power supply to the low-voltage system is restored. If the low-voltage system is powered on, the low-voltage system is not controlled. After the low-voltage system is powered on, S212 is executed.

[0126] S212: Determine whether the vehicle is powered on within a preset time period.

[0127] The preset time length is 30 seconds. If the vehicle is not powered on within 30 seconds, the process returns to S209 . If the vehicle is powered on within 30 seconds, the process executes S213 .

[0128] S213, low voltage system maintains power supply.

[0129] S202 is further executed to determine whether to restore the power supply of the high-voltage system. If the low-voltage maintenance switch is disconnected, the power supply of the high-voltage system is not restored. If the low-voltage maintenance switch is closed, the power supply of the high-voltage system is restored.

[0130] Optionally, the method further comprises:

[0131] When the low-voltage system of the vehicle remains powered and there is no abnormality in the high-voltage interlock state of the vehicle, in response to the first control switch of the vehicle being closed, power supply to the high-voltage system of the vehicle is restored.

[0132] Among them, the low-voltage system of the vehicle remains powered on, which indicates that the low-voltage system of the vehicle has resumed power supply and the vehicle is powered on within a preset time after the user triggers the third control switch.

[0133] In one implementation, after both the high-voltage system and the low-voltage system of the vehicle are powered off, if it is necessary to restore power to the high-voltage system, the following conditions need to be met.

[0134] First, power supply to the low-voltage system has been restored.

[0135] It is worth mentioning that in order to ensure the safety of vehicles and maintenance personnel, the high-voltage system should resume power supply after the low-voltage system resumes power supply.

[0136] Second, the first control switch of the high voltage system is closed.

[0137] Among them, the closing of the first control switch indicates that the maintenance personnel intends to exit the maintenance mode and restore the high voltage power supply.

[0138] Third, there is no abnormality in the high-voltage interlocking status.

[0139] In one embodiment, the PDC will inspect in real time whether the high-voltage interlock status of the vehicle is normal. If the high-voltage interlock status is normal, the user cannot control the first control switch to close to restore the high voltage or the first control switch does not respond to the user's closing command. For example, the user can disconnect or close the first control switch through the vehicle's control panel. When the high-voltage interlock status of the vehicle is abnormal, the user can be prompted on the panel that "the high-voltage interlock is abnormal, and the vehicle's high-voltage system cannot be disconnected or restored" to ensure that the vehicle's high-voltage system is safely isolated, thereby improving operational safety during the maintenance process.

[0140] It is worth noting that HVIL (High Voltage Inter-lock) is used to isolate the high-voltage system and low-voltage system of the vehicle. When a fault occurs in the high-voltage system or an unsafe condition is detected, the high-voltage connector is disconnected mechanically to isolate the high-voltage system to ensure that maintenance personnel can safely perform maintenance or repairs when the high-voltage system is completely powered off. The high-voltage interlock status includes the status of at least one of the high-voltage components in the high-voltage interlock circuit, the connecting hard wire, the high-voltage interlock connector, and the monitoring system.

[0141] Fourth, the user triggers the micro-control switch and controls the vehicle to power on within a preset time after the triggering.

[0142] By adding vehicle power-on detection to the conditions for high-voltage system power restoration, the danger of maintenance personnel accidentally touching the micro-control switch and causing unexpected restoration of vehicle high voltage is avoided, thereby improving the safety of vehicle maintenance.

[0143] For example, after the low-voltage system and the high-voltage system of the vehicle are both powered off, if the maintenance personnel need to turn on the low-voltage system, they can press the micro-control switch and control the vehicle to power on within a preset time. If the maintenance personnel need to turn on the high-voltage system, they can press the micro-control switch. After the low-voltage system of the vehicle resumes power supply, the first control switch is controlled to close and the vehicle is controlled to power on within a preset time. At this time, both the low-voltage system and the high-voltage system of the vehicle resume power supply.

[0144] Optionally, the method further comprises:

[0145] In response to the preset high level signal, the vehicle in a dormant state is awakened.

[0146] It is worth mentioning that when the vehicle is in sleep mode, the low-voltage system will remain powered, and the LBMS will continue to inspect the status of the devices in the low-voltage system circuit. For example, the LBMS will inspect the SOC (State of charge) of the low-voltage power supply to ensure that the low-voltage power supply can provide sufficient power when the vehicle is awakened.

[0147] In one embodiment, a vehicle in a dormant state can be awakened by a micro-control switch.

[0148] Optionally, controlling the low-voltage system of the vehicle to be powered off following the high-voltage system, comprises:

[0149] The electric energy in the high-voltage system is discharged until the bus voltage of the high-voltage system is lower than a preset voltage threshold, and then the electric energy discharge is stopped and the power supply to the low-voltage power supply system is shut down.

[0150] For example, see Figure 2 and Figure 3 As shown, after the vehicle enters the maintenance mode, the vehicle controller, i.e., the first controller, first confirms that the high-voltage system has been disconnected through the vehicle's high-voltage hard-line interlocking status and sensors, and then starts the power discharge program, that is, releases the electric energy in the first control switch and the capacitors in the high-voltage system. During the power discharge process, the battery pack management system monitors the bus voltage of the high-voltage system in real time until the bus voltage drops below the preset voltage threshold, which means that the voltage is considered to be at a safe level, stops discharging electric energy, and disconnects the low-voltage power supply through the LBMS, wherein the preset voltage threshold can be set to 60V.

[0151] In addition, during the electric energy discharge process, the voltage value of the bus voltage before and after the discharge and the discharge duration are recorded for fault diagnosis.

[0152] In another embodiment, after both the high-voltage system and the low-voltage system of the vehicle are powered off, if it is necessary to restore power to the high-voltage system, it is first necessary to restore power to the low-voltage system through a micro-control switch. For specific implementation methods, please refer to the above embodiments, which will not be repeated here. After the low-voltage system is restored and maintains power supply, the first control switch, i.e., the low-voltage maintenance switch, can be used to restore power to the vehicle's high-voltage system.

[0153] In addition, the PDC will inspect the vehicle's high-voltage hard-wire interlocking status in real time to ensure that the loop connection of the high-voltage system is in normal condition. If the high-voltage hard-wire interlocking status is abnormal, power supply to the high-voltage system cannot be restored through the low-voltage maintenance switch.

[0154] Through the above method, the safety of vehicle maintenance can be provided.

[0155] Optionally, in response to controlling the power-off of the high-voltage system of the vehicle, obtaining the vehicle status information includes:

[0156] The on / off state of the first control switch of the high-voltage system is monitored by the first controller of the vehicle.

[0157] In response to the first control switch of the high-voltage system being disconnected, the vehicle status information is acquired through the first controller.

[0158] In one embodiment, the PDC detects the on / off status of the vehicle's low-voltage maintenance switch in real time. If the vehicle's low-voltage maintenance switch is disconnected, it means that the vehicle needs to enter maintenance mode. The PDC obtains vehicle status information to ensure that the low-voltage maintenance switch is not accidentally disconnected, such as when the vehicle crashes and causes the first control switch to be accidentally disconnected.

[0159] Through the above method, the reliability and safety of vehicle maintenance control can be improved.

[0160] See also Figure 4 As shown, the present disclosure further provides a vehicle control device 300 , which includes an acquisition module 301 , a determination module 302 , and a control module 303 .

[0161] The acquisition module 301 is configured to acquire vehicle status information in response to power-off control of the high-voltage system of the vehicle.

[0162] The determination module 302 is configured to determine whether the vehicle meets the maintenance safety condition according to the vehicle status information.

[0163] The control module 303 is configured to control the low-voltage system of the vehicle to be powered off.

[0164] Optionally, the control module 303 is configured to:

[0165] A low voltage power-off instruction is sent to a second controller of the vehicle through the first controller of the vehicle to trigger the second controller to control the second control switch of the low voltage system to be disconnected.

[0166] Optionally, the vehicle state information includes the speed of the vehicle and the collision fault state of the vehicle, and the determination module 302 is configured to:

[0167] When the speed of the vehicle is lower than a preset vehicle speed threshold and the collision fault state is that no collision fault occurs, it is determined that the vehicle meets the maintenance safety condition.

[0168] Optionally, the determining module 302 is configured to:

[0169] A collision fault signal of the vehicle and a device detection signal of a collision safety device of the vehicle are obtained.

[0170] When the collision fault signal is not detected and the device detection signal indicates no abnormality, it is determined that the collision fault state of the vehicle is that no collision has occurred.

[0171] When the collision fault signal is detected, or the device detection signal indicates an abnormality, the collision fault state of the vehicle is determined to be a collision.

[0172] Optionally, the collision safety device includes a collision hard line and an airbag system, and the determination module 302 is configured to:

[0173] The collision hard line and the airbag system are tested.

[0174] If there is no abnormality in the collision hard line and the airbag system, the device detection signal indicates no abnormality.

[0175] If any one of the collision hard line and the airbag system is abnormal, the device detection signal indicates the abnormality.

[0176] Optionally, the vehicle further includes a third control switch, the third control switch is communicatively connected to the second controller, and the control module 303 is configured as follows:

[0177] In response to the high level signal triggered by the third control switch, the second control switch is controlled by the second controller to close, so as to restore power supply to the low voltage system of the vehicle.

[0178] Optionally, the control module 303 is configured to:

[0179] After the low-voltage system of the vehicle resumes power supply, a power-on detection is performed on the vehicle.

[0180] If the vehicle is not powered on within a preset time period, the power supply to the low-voltage system is disconnected.

[0181] If the vehicle is powered on within the preset time period, the power supply to the low-voltage system is maintained.

[0182] Optionally, the control module 303 is configured to:

[0183] When the low-voltage system of the vehicle remains powered and there is no abnormality in the high-voltage interlock state of the vehicle, in response to the first control switch of the vehicle being closed, power supply to the high-voltage system of the vehicle is restored.

[0184] Optionally, the control module 303 is configured to:

[0185] The electric energy in the high-voltage system is discharged until the bus voltage of the high-voltage system is lower than a preset voltage threshold, and then the electric energy discharge is stopped and the power supply to the low-voltage power supply system is shut down.

[0186] Optionally, the acquisition module 301 is configured to:

[0187] Monitoring the on / off state of a first control switch of the high-voltage system by a first controller of the vehicle;

[0188] In response to the first control switch of the high-voltage system being disconnected, the vehicle status information is acquired through the first controller.

[0189] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0190] The present disclosure also provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the vehicle control method provided by the present disclosure is implemented.

[0191] The present disclosure also provides a controller, comprising:

[0192] a memory having a computer program stored thereon;

[0193] A processor is used to execute the computer program in the memory to implement the vehicle control method provided by the present disclosure.

[0194] The present disclosure also provides a vehicle, comprising a processor and a controller provided by the present disclosure.

[0195] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0196] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0197] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A vehicle control method, characterized in that: The method comprises: acquiring vehicle status information in response to power-off control of a high voltage system of the vehicle; Determining, according to the vehicle status information, that the vehicle meets a maintenance safety condition; Controlling the de-energization of the low voltage system of the vehicle; The method further comprises: In response to a high level signal triggered by a third control switch of the vehicle, a second control switch of the low voltage system is controlled by a second controller of the vehicle to close, so as to restore power supply to the low voltage system of the vehicle, wherein the third control switch is a micro control switch; After the low-voltage system of the vehicle resumes power supply, performing a power-on detection on the vehicle, wherein the power-on detection is used to detect a key status of the vehicle; If the vehicle is not powered on within a preset time, disconnecting the power supply to the low-voltage system; If the vehicle is powered on within the preset time period, the low-voltage system is powered on, and when the low-voltage system of the vehicle remains powered on and there is no abnormality in the high-voltage interlocking state of the vehicle, in response to the closing of the first control switch of the vehicle, the power supply to the high-voltage system of the vehicle is restored.

2. The method according to claim 1, characterized in that The controlling the low-voltage system of the vehicle to be powered off comprises: A low voltage power-off instruction is sent to a second controller of the vehicle through the first controller of the vehicle to trigger the second controller to control the second control switch of the low voltage system to be disconnected.

3. The method according to claim 1, characterized in that The vehicle status information includes the speed of the vehicle and the collision fault status of the vehicle, and determining that the vehicle meets the maintenance safety condition according to the vehicle status information includes: When the speed of the vehicle is lower than a preset vehicle speed threshold and the collision fault state is that no collision fault occurs, it is determined that the vehicle meets the maintenance safety condition.

4. The method according to claim 3, characterized in that The method further comprises: Acquiring a collision fault signal of the vehicle and a device detection signal of a collision safety device of the vehicle; When the collision fault signal is not detected and the detection signal of the device indicates no abnormality, determining that the collision fault state of the vehicle is that no collision has occurred; When the collision fault signal is detected, or the device detection signal indicates an abnormality, the collision fault state of the vehicle is determined to be a collision.

5. The method according to claim 4, characterized in that The collision safety device includes a collision hard line and an airbag system, and the method further includes: Testing the collision hard line and the airbag system; If the collision hard line and the airbag system are both normal, the device detection signal indicates that there is no abnormality; If any one of the collision hard line and the airbag system is abnormal, the device detection signal indicates the abnormality.

6. The method according to claim 1, characterized in that The controlling the low-voltage system of the vehicle to be powered off comprises: The electric energy in the high-voltage system is discharged until the bus voltage of the high-voltage system is lower than a preset voltage threshold, and then the electric energy discharge is stopped and the power supply to the low-voltage system is shut off.

7. The method according to claim 1, characterized in that The step of obtaining vehicle status information in response to power-off control of a high-voltage system of the vehicle includes: Monitoring the on / off state of a first control switch of the high-voltage system by a first controller of the vehicle; In response to the first control switch of the high-voltage system being disconnected, the vehicle status information is acquired through the first controller.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 7 are implemented.

9. A controller, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the method according to any one of claims 1 to 7.

10. A vehicle, characterized in that: The device comprises a processor and the controller as claimed in claim 9.

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