Vehicle power-off control method, device, vehicle, and storage medium

Abstract

The present invention relates to the field of vehicle control technology, and discloses a vehicle power-off control method, device, vehicle, and storage medium. When the present invention identifies a first vehicle power-off signal indicating that a low-voltage load needs to work after the vehicle is powered off at low voltage, the low-voltage electrical system is first controlled to power off. If the working current of the low-voltage load is greater than the working current threshold and the high-voltage power supply state meets the preset power supply conditions, it indicates that the vehicle has a delayed power-off demand for the high-voltage electrical system, and the high-voltage electrical system can meet the delayed power-off demand, then the timing is started, and the high-voltage electrical system is maintained in the powered-on state during the timing period. When the timing is completed, the high-voltage electrical system is controlled to power off. As a result, the high-voltage electrical system supplies power to the low-voltage battery during the timing period, ensuring that the low-voltage load works normally during the delay period. The low-voltage battery can also be charged in advance to reduce the excessive power consumption of the high-voltage electrical system during the low-voltage battery charging process, thereby ensuring the vehicle's endurance.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a vehicle power-off control method, device, vehicle, and storage medium. Background Art

[0002] As automobiles gradually develop rapidly towards new energy, electrification and intelligence, vehicle functions are becoming more and more abundant, such as headlights accompanying the driver home, delayed shutdown of the entertainment system, and smart guest transportation. However, many functions will consume a large amount of power from the low-voltage battery when parking, resulting in a reduction in the parking time of the vehicle.

[0003] At present, the existing solution uses a high-voltage battery to intelligently recharge the battery when the battery power is consumed too much during parking. However, the battery's charging and discharging capabilities are greatly weakened in special environments such as low temperatures, and the recharging efficiency is low, causing the high-voltage battery to consume more power, seriously affecting the vehicle's endurance. Summary of the Invention

[0004] In view of this, the present invention provides a vehicle power-off control method, device, vehicle and storage medium to solve the problem that the existing solution uses a high-voltage battery to supplement the power of a low-voltage battery with low power, which easily consumes excessive power of the high-voltage battery.

[0005] In a first aspect, the present invention provides a vehicle power-off control method, the method comprising:

[0006] Upon receiving the first vehicle power-off signal, controlling the low-voltage electrical system to power off, and determining the high-voltage power supply state of the high-voltage electrical system and the operating current of the low-voltage load;

[0007] If it is detected that the working current of the low-voltage load is greater than the working current threshold and the high-voltage power supply status meets the preset power supply conditions, timing is performed to delay the power-off of the high-voltage electrical system;

[0008] During the timing period, the high-voltage electrical system is controlled to supply power to the low-voltage battery, and when the timing is completed, the high-voltage electrical system is controlled to be powered off.

[0009] Beneficial effect: When the present invention identifies the first vehicle power-off signal that the low-voltage load needs to work after the vehicle is powered off at low voltage, it first controls the low-voltage electrical system to power off, and detects the high-voltage power supply state of the high-voltage electrical system and the working current of the low-voltage load. If the working current of the low-voltage load is greater than the working current threshold and the high-voltage power supply state meets the preset power supply conditions, it means that the vehicle has a delayed power-off demand for the high-voltage electrical system, and the high-voltage electrical system can meet the delayed power-off demand, then the timing starts, and the high-voltage electrical system is maintained in the powered-on state during the timing period. When the timing is completed, the high-voltage electrical system is controlled to power off. Thereby, the high-voltage electrical system supplies power to the low-voltage battery during the timing period, ensuring that the low-voltage load works normally during the delay period. It can also charge the low-voltage battery in advance, reduce the excessive consumption of electricity of the high-voltage electrical system during the low-voltage battery charging process, and ensure the vehicle's endurance.

[0010] In an optional embodiment, the high-voltage electrical system includes a high-voltage battery and a voltage converter, wherein the voltage converter is connected between the high-voltage battery and the low-voltage battery, and determines the high-voltage power supply state of the high-voltage electrical system and the operating current of the low-voltage load, including:

[0011] According to the voltage value of the low-voltage battery and the first working mode of the low-voltage battery, a corresponding method is selected to process the first current value of the low-voltage battery and the second current value output by the voltage converter to obtain the working current of the low-voltage load;

[0012] A high-voltage power supply state of the high-voltage electrical system is determined according to the state of charge of the high-voltage battery and the second operating mode of the voltage converter.

[0013] Beneficial Effects: The present invention determines the operating current of a low-voltage load using the first current value of the low-voltage battery and the second current value output by the voltage converter, thereby determining whether the low-voltage load requires a high-voltage delayed power-off. Furthermore, the high-voltage power supply status of the high-voltage electrical system is determined by the high-voltage battery's state of charge and the voltage converter's second operating mode, thereby determining whether the high-voltage electrical system can meet the high-voltage delayed power-off requirement.

[0014] In an optional embodiment, determining the high-voltage power supply state of the high-voltage electrical system according to the state of charge of the high-voltage battery and the second operating mode of the voltage converter includes:

[0015] If it is detected that the state of charge of the high-voltage battery is greater than the state of charge threshold and the second operating mode is the step-down mode, it is determined that the high-voltage power supply state of the high-voltage electrical system meets the preset power supply condition.

[0016] Beneficial effect: The present invention detects the charge state of the high-voltage battery and the second working mode, and then determines whether the state of the high-voltage battery can power the low-voltage battery, thereby avoiding excessive discharge of the high-voltage battery when the preset power supply conditions are not met, and is safer.

[0017] In an optional embodiment, according to the voltage value of the low-voltage battery and the first operating mode of the low-voltage battery, a corresponding method is selected to process the first current value of the low-voltage battery and the second current value output by the voltage converter to obtain the operating current of the low-voltage load, including:

[0018] If it is detected that the voltage value of the low-voltage battery is not greater than the voltage threshold and the first working mode is the power supply mode, the first current value is used as the working current of the low-voltage load; wherein the power supply mode is a mode in which the low-voltage battery alone supplies power to the low-voltage load;

[0019] If it is detected that the voltage value of the low-voltage battery is greater than the voltage threshold and the first operating mode is the charging mode, the operating current of the low-voltage load is obtained according to the sum of the first current value and the second current value; wherein the charging mode is a mode in which the low-voltage battery and the voltage converter jointly power the low-voltage load;

[0020] If it is detected that the voltage value of the low-voltage battery is greater than the voltage threshold and the first working mode is the discharge mode, the working current of the low-voltage load is obtained according to the difference between the second current value and the first current value; wherein, the discharge mode is a mode in which the low-voltage battery discharges and the voltage converter alone supplies power to the low-voltage load.

[0021] Beneficial effect: The present invention selects a matching method to process the first current value of the low-voltage battery and the second current value output by the voltage converter according to the size relationship between the voltage value of the low-voltage battery and the voltage threshold and the first working mode of the low-voltage battery, calculates the working current of the low-voltage load in combination with the actual working conditions, and then accurately judges the power demand of the low-voltage load with higher accuracy.

[0022] In an optional embodiment, the method further includes:

[0023] When the second vehicle power-off signal is received during the timing period, the timing is stopped and the high-voltage electrical system is controlled to be powered off; wherein, the second vehicle power-off signal is a vehicle power-off signal that controls the low-voltage loads not to work after the vehicle is powered off at low voltage.

[0024] Beneficial effect: When the present invention receives the second vehicle power-off signal during the timing period, it interrupts the timing and immediately controls the high-voltage electrical system to power off, thereby meeting the user's personalized demand that the low-voltage load does not work after the vehicle is powered off at low voltage, thereby reducing the power consumption of the vehicle during the power-off period.

[0025] In an optional embodiment, the method further includes:

[0026] When the vehicle power-on signal is received during the timing period, the timing is stopped and the high-voltage electrical system is kept powered on.

[0027] Beneficial effect: When the present invention receives a vehicle power-on signal during the timing period, the timing is interrupted and the high-voltage electrical system continues to be powered on, thereby meeting the user's vehicle power demand.

[0028] In an optional embodiment, the method further includes:

[0029] If it is detected that the operating current of the low-voltage load is not greater than the operating current threshold or the high-voltage power supply status does not meet the preset power supply conditions, the high-voltage electrical system is controlled to be powered off.

[0030] Beneficial Effects: When the present invention detects that the operating current of a low-voltage load is not greater than the operating current threshold, indicating that the low-voltage load does not have a high power demand, the high-voltage electrical system is immediately powered off, thereby achieving energy conservation. If it is detected that the low-voltage power supply status does not meet the preset power supply conditions, the high-voltage electrical system is also immediately powered off, thereby protecting the equipment and ensuring system safety and stability.

[0031] In a second aspect, the present invention provides a vehicle power-off control device, the device comprising:

[0032] A first processing module is configured to control the low-voltage electrical system to power off upon receiving the first vehicle power-off signal, and to determine the high-voltage power supply state of the high-voltage electrical system and the operating current of the low-voltage load;

[0033] The second processing module is used to perform timing if it is detected that the working current of the low-voltage load is greater than the working current threshold and the high-voltage power supply state meets the preset power supply conditions. The timing is used to delay the power-off of the high-voltage electrical system;

[0034] The third processing module is used to control the high-voltage electrical system to supply power to the low-voltage battery during the timing period, and to control the high-voltage electrical system to power off when the timing is completed.

[0035] In a third aspect, the present invention provides a vehicle comprising: a body domain controller, a high-voltage electrical system, and a low-voltage electrical system;

[0036] The vehicle body domain controller includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the vehicle power-off control method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0037] In an optional embodiment, the vehicle further includes a power domain controller, which controls the high-voltage electrical system to power off in response to a request from the body domain controller.

[0038] In an optional embodiment, the vehicle further includes a cockpit domain controller, which, in response to a first operation by the user, sends a first vehicle power-off signal to the body domain controller, wherein the first operation is an operation of controlling the low-voltage load to operate after the vehicle is powered off at low voltage;

[0039] The cockpit domain controller responds to the user's second operation and sends a second vehicle power-off signal to the body domain controller. The second operation is to control the low-voltage load to not work after the vehicle is powered off at low voltage.

[0040] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the vehicle power-off control method of the first aspect or any corresponding embodiment thereof.

[0041] The beneficial effects of the present invention are:

[0042] When the present invention identifies the first vehicle power-off signal that the low-voltage load needs to work after the vehicle is powered off at low voltage, it first controls the low-voltage electrical system to power off, and detects the high-voltage power supply state of the high-voltage electrical system and the working current of the low-voltage load. If the working current of the low-voltage load is greater than the working current threshold and the high-voltage power supply state meets the preset power supply conditions, it means that the vehicle has a delayed power-off demand for the high-voltage electrical system, and the high-voltage electrical system can meet the delayed power-off demand, then the timing starts, and the high-voltage electrical system is maintained in the powered-on state during the timing period. When the timing is completed, the high-voltage electrical system is controlled to power off. In this way, the high-voltage electrical system supplies power to the low-voltage battery during the timing period, ensuring that the low-voltage load works normally during the delay period. It can also charge the low-voltage battery in advance, reduce the excessive consumption of electricity of the high-voltage electrical system during the low-voltage battery charging process, and ensure the vehicle's endurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 is a flow chart of a vehicle power-off control method according to an embodiment of the present invention;

[0045] Figure 2 is a flow chart of another vehicle power-off control method according to an embodiment of the present invention;

[0046] Figure 3 is a schematic structural diagram of a vehicle according to an embodiment of the present invention;

[0047] Figure 4 is a schematic structural diagram of another vehicle according to an embodiment of the present invention;

[0048] Figure 5 is a flow chart of another vehicle power-off control method according to an embodiment of the present invention;

[0049] Figure 6 is a structural block diagram of a vehicle power-off control device according to an embodiment of the present invention;

[0050] Figure 7 Schematic diagram of the hardware structure of the vehicle body domain controller according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0052] According to an embodiment of the present invention, an embodiment of a vehicle power-off control method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0053] In this embodiment, a vehicle power-off control method is provided. Figure 1 FIG. 1 is a flow chart of a vehicle power-off control method according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0054] Step S101 , when receiving a first vehicle power-off signal, controlling the low-voltage electrical system to power off, and determining the high-voltage power supply state of the high-voltage electrical system and the operating current of the low-voltage load.

[0055] Specifically, the vehicle includes a high-voltage electrical system and a low-voltage electrical system, wherein the low-voltage electrical system includes a low-voltage load and a low-voltage battery for supplying power to the low-voltage load, wherein the low-voltage battery may be a storage battery.

[0056] Before step S101, when the cockpit detects the user's first operation, it will send a first vehicle power-off signal to the vehicle main control module, such as the body domain controller. The first operation is to control the low-voltage load to work after the vehicle is powered off at low voltage. For example, the user controls the vehicle to be powered off through operations such as keys, protective earth (PE) locking mechanisms, etc. These operations require that some low-voltage loads, such as anti-theft systems, communication equipment, various sensors or control units, continue to work while the vehicle is parked.

[0057] In step S101, upon receiving a first vehicle power-off signal, the vehicle's main control module, such as a body domain controller, powers down the low-voltage electrical system. After the low-voltage electrical system is powered off, the low-voltage battery continues to supply power to some low-voltage loads, allowing them to continue operating after the vehicle is turned off. Therefore, the low-voltage loads continue to draw current even after the low-voltage system is powered off. The first vehicle power-off signal is a signal that controls the operation of the low-voltage loads after the vehicle's low voltage is powered off.

[0058] Specifically, electrical parameters of the high-voltage electrical system, such as the current output to the low-voltage battery, the state of charge (SOC), and the second operating mode, and electrical parameters of the low-voltage battery, such as the voltage, current, and first operating mode, can be obtained, thereby obtaining the high-voltage power supply state of the high-voltage electrical system and the operating current of the low-voltage load. The electrical parameters of the high-voltage electrical system and the low-voltage battery can be obtained by sensors such as battery sensors or a battery management system (BMS), but the present invention is not limited thereto.

[0059] In some optional embodiments, before step S101, when the cockpit detects the user's second operation, it will send a second vehicle power-off signal to the vehicle main control module, such as the body domain controller. The second operation is to control the low-voltage load to not work after the vehicle is powered off at low voltage. For example, in scenarios such as long-term parking or vehicle maintenance, the user can control the vehicle to power off through operations such as a one-button soft switch. After receiving the second vehicle power-off signal, the vehicle main control module, such as the body domain controller, will immediately control the low-voltage electrical system and the high-voltage electrical system to power off. The second vehicle power-off signal is a vehicle power-off signal that controls the low-voltage load to not work after the vehicle is powered off at low voltage.

[0060] In step S102 , if it is detected that the operating current of the low-voltage load is greater than the operating current threshold and the high-voltage power supply state meets the preset power supply condition, timing is performed, and the timing is used to delay powering off the high-voltage electrical system.

[0061] In step S102, when the working current I 总 Not greater than the operating current threshold I阈值 When the vehicle is powered off, it is judged that the load power consumption is small, the low-voltage battery power consumption is small, and the high-voltage electrical system is controlled to power off to achieve energy saving. 总 When it is greater than the set threshold, it is judged that the load power consumption is large after the vehicle is powered off, and the low-voltage battery power is consumed greatly.

[0062] Specifically, if the operating current of the low-voltage load I 总 Greater than the operating current threshold I 阈值 , indicating that the vehicle has a high-voltage delayed power-off requirement, and if the high-voltage power supply status meets the preset power supply conditions, it means that the power supply capacity of the high-voltage electrical system can meet the high-voltage delayed power-off requirement of the vehicle. Then, the timing starts to delay the power-off of the high-voltage electrical system. It should be noted that the working current threshold I 阈值 The preset power supply conditions can be set in combination with specific application scenarios.

[0063] Step S103 , controlling the high-voltage electrical system to supply power to the low-voltage battery during the timing period, and controlling the high-voltage electrical system to power off when the timing is completed.

[0064] Specifically, the high-voltage electrical system is maintained in a powered-on state during the timing period to ensure that the high-voltage electrical system can continue to supply power during the delay process, maintain the normal operation of the low-voltage load, and charge the low-voltage battery so that the low-voltage battery has more power for load operation, thereby extending the parking time of the vehicle. If the timer used for timing records the time that has elapsed since the start of the timing and reaches the target delay time T1, the timing is completed, and the high-voltage electrical system is controlled to be powered off. The start time of the timing is: the moment when the timing is started, and the completion time of the timing can be: the moment when the time interval from the start of the timing is the target delay time.

[0065] Furthermore, since the charging and discharging capabilities of low-voltage batteries are significantly weakened in low-temperature environments, if the low-voltage battery is consumed excessively during parking, even if the low-voltage battery can be intelligently recharged at low temperatures, the recharge efficiency is low, causing the high-voltage battery to consume more power, seriously affecting the vehicle's endurance in low temperatures. This embodiment charges the low-voltage battery by delaying the power-down of the high-voltage electrical system, eliminating the need for recharging when the low-voltage battery is severely low. This avoids excessive power consumption of the high-voltage electrical system due to low recharge efficiency, helps maintain the vehicle's charge state, and thus ensures the vehicle's endurance.

[0066] In some optional implementations, the target delay time T1 can be set in combination with the actual scenario, or the target delay time T1 can be determined based on the charge state of the low-voltage battery and the working time of the low-voltage load after the vehicle is powered off. In this way, the delay of high-voltage power-off is dynamically controlled according to the actual state of the vehicle power system, ensuring that the low-voltage load can maintain normal operation during the delay process and charging the low-voltage battery to prevent the low-voltage battery from being damaged due to power loss. It should be noted that after the target delay time T1 is determined during a power-off process, the T1 value cannot be adjusted to avoid excessive delays in the power-off process.

[0067] The vehicle power-off control method provided in this embodiment, when identifying the first vehicle power-off signal that the low-voltage load needs to work after the vehicle is powered off at low voltage, first controls the low-voltage electrical system to power off, and detects the high-voltage power supply state of the high-voltage electrical system and the working current of the low-voltage load. If the working current of the low-voltage load is greater than the working current threshold and the high-voltage power supply state meets the preset power supply conditions, it means that the vehicle has a delayed power-off requirement for the high-voltage electrical system, and the high-voltage electrical system can meet this delayed power-off requirement, then the timing starts, and the high-voltage electrical system is maintained in the powered-on state during the timing period. When the timing is completed, the high-voltage electrical system is controlled to power off. In this way, the high-voltage electrical system supplies power to the low-voltage battery during the timing period, ensuring that the low-voltage load works normally during the delay period. It can also charge the low-voltage battery in advance, reduce the excessive consumption of the high-voltage electrical system during the charging process, and ensure the vehicle's endurance.

[0068] In this embodiment, a vehicle power-off control method is provided. Figure 2 FIG. 1 is a flow chart of a vehicle power-off control method according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0069] Step S201 : upon receiving a first vehicle power-off signal, controlling the low-voltage electrical system to power off, and determining the high-voltage power supply state of the high-voltage electrical system and the operating current of the low-voltage load.

[0070] Specifically, the above step S201 includes:

[0071] Step S2011 , according to the voltage value of the low-voltage battery and the first working mode of the low-voltage battery, a corresponding method is selected to process the first current value of the low-voltage battery and the second current value output by the voltage converter to obtain the working current of the low-voltage load.

[0072] Specifically, if it is detected that the voltage value of the low-voltage battery is not greater than the voltage threshold and the first working mode is the power supply mode, the first current value is used as the working current of the low-voltage load. The power supply mode is a mode in which the low-voltage battery alone supplies power to the low-voltage load.

[0073] In some optional implementations, if the voltage of the low-voltage battery is lower than 13.5V, and the low-voltage end of the voltage converter has no output current, that is, the second current value I DC / DC =0, indicating that the low-voltage battery is used to supply power to the low-voltage load alone, and the low-voltage battery is in power supply mode. At this time, the working current of the low-voltage load is I 总 =I IBS , where I IBS Indicates the first current value of the low-voltage battery. The voltage value of the low-voltage battery, the first current value I IBS and the second current value I output by the voltage converter DC / CC It can be collected through sensors or BMS.

[0074] Specifically, if it is detected that the voltage value of the low-voltage battery is greater than the voltage threshold and the first working mode is the charging mode, the working current of the low-voltage load is obtained according to the sum of the first current value and the second current value; wherein, the charging mode is a mode in which the low-voltage battery and the voltage converter jointly power the low-voltage load.

[0075] In some optional implementations, if the voltage of the low-voltage battery is higher than 13.5V, the low-voltage end of the voltage converter has an output, and the charging current of the low-voltage battery is detected, the low-voltage battery and the low-voltage end of the voltage converter jointly power the low-voltage load, and the low-voltage battery is in charging mode. At this time, the working current of the low-voltage load I 总 =I DC / DC +I IBS .

[0076] Specifically, if it is detected that the voltage value of the low-voltage battery is greater than the voltage threshold and the first working mode is the discharge mode, the working current of the low-voltage load is obtained according to the difference between the second current value and the first current value; wherein, the discharge mode is a mode in which the low-voltage battery discharges and the voltage converter alone supplies power to the low-voltage load.

[0077] In some optional implementations, if the voltage of the low-voltage battery is higher than 13.5V, the low-voltage end of the voltage converter has an output, and the discharge current of the low-voltage battery is detected, the low-voltage battery discharges and the voltage converter supplies power to the low-voltage load alone, and the low-voltage battery is in discharge mode. At this time, the working current of the low-voltage load I 总 =I DC / DC -I IBS It should be noted that even without a low-voltage load, a low-voltage battery will slowly self-discharge due to internal chemical reactions.

[0078] The present invention selects a matching method to process the first current value of the low-voltage battery and the second current value output by the voltage converter based on the size relationship between the voltage value of the low-voltage battery and the voltage threshold and the first working mode of the low-voltage battery, calculates the working current of the low-voltage load in combination with the actual working conditions, and then accurately judges the power demand of the low-voltage load with higher accuracy.

[0079] Step S2012 : determining the high voltage power supply state of the high voltage electrical system according to the state of charge of the high voltage battery and the second operating mode of the voltage converter.

[0080] In the present invention, the high-voltage electrical system includes a high-voltage battery and a voltage converter. The voltage converter is connected between the high-voltage battery and the low-voltage battery. The voltage converter can be a direct current to direct current converter (DC / DC). The status of the high-voltage electrical system and the low-voltage electrical system can be monitored by a battery management system (BMS) or sensors. The power supply status of the high-voltage electrical system can then be determined based on the state of charge of the high-voltage battery and the second operating mode.

[0081] In step S2012, if the high-voltage battery's state of charge is detected to be greater than the state of charge threshold and the second operating mode is the step-down mode, the high-voltage electrical system's high-voltage power supply status is determined to meet the preset power supply conditions. By detecting the high-voltage battery's state of charge and the second operating mode, it is determined whether the high-voltage battery is capable of supplying power to the low-voltage battery, thereby preventing excessive discharge of the high-voltage battery when the preset power supply conditions are not met, thereby improving safety.

[0082] In some optional implementations, if it is detected that the high-voltage power supply status does not meet the preset power supply conditions, the high-voltage electrical system is controlled to be powered off, thereby protecting the equipment and ensuring system safety and stability.

[0083] The present invention determines the operating current of the low-voltage load using the first current value of the low-voltage battery and the second current value output by the voltage converter, thereby determining whether the low-voltage load requires a high-voltage delayed power-off. Furthermore, the high-voltage power supply status of the high-voltage electrical system is determined based on the high-voltage battery's state of charge and the voltage converter's second operating mode, thereby determining whether the high-voltage electrical system can meet the high-voltage delayed power-off requirement.

[0084] Step S202: If it is detected that the working current of the low-voltage load is greater than the working current threshold and the high-voltage power supply state meets the preset power supply conditions, a timer is started, and the timer is used to delay the power-off of the high-voltage electrical system. Figure 1 The detailed description of step S102 of the illustrated embodiment will not be repeated here.

[0085] Step S203: Control the high voltage electrical system to supply power to the low voltage battery during the timing period, and when the timing is completed, control the high voltage electrical system to power off. Figure 1 The detailed description of step S103 of the illustrated embodiment will not be repeated here.

[0086] Step S204: When a second vehicle power-off signal is received during the timing period, the timing is stopped and the high-voltage electrical system is controlled to be powered off; wherein the second vehicle power-off signal is a vehicle power-off signal generated when the low-voltage load does not work after the vehicle is powered off at low voltage.

[0087] Specifically, when the second vehicle power-off signal is received during the timing period, the timing is interrupted and the high-voltage electrical system is immediately controlled to be powered off, thereby meeting the user's personalized demand that the low-voltage load does not work after the vehicle is powered off at low voltage, thereby reducing the power consumption of the vehicle during the power-off period.

[0088] Step S205: When a vehicle power-on signal is received within the timing period, the timing is stopped and the high-voltage electrical system is kept powered on.

[0089] When the present invention receives a vehicle power-on signal during the timing period, the timing is interrupted and the high-voltage electrical system continues to be powered on, thereby meeting the user's vehicle power demand.

[0090] In some optional embodiments, during the timing period, the high-voltage and low-voltage electrical systems are continuously monitored, and the current of the low-voltage load, the vehicle power level signal, and the high-voltage battery's SOC are collected to determine whether to continue the high-voltage delayed power-off. For example, if during the timing period, the low-voltage terminal of the voltage converter stops outputting or the high-voltage battery's state of charge exceeds a state-of-charge threshold, indicating that the high-voltage power supply status of the high-voltage electrical system no longer meets the power supply conditions, the high-voltage electrical system is immediately controlled to be powered off, and the timing period is no longer continued.

[0091] The vehicle power-off control method provided in this embodiment, upon identifying a first vehicle power-off signal, first controls the low-voltage electrical system to power off. If, based on the operating current of the low-voltage load and the high-voltage power supply status of the high-voltage electrical system, it is detected that the vehicle has a delayed power-off requirement for the high-voltage electrical system, and the high-voltage electrical system is able to meet this delayed power-off requirement, then a timer is started, and the high-voltage electrical system is maintained in a powered-on state during the timer period. When the timer is completed, the high-voltage electrical system is controlled to power off. This ensures that the low-voltage load operates normally during the delayed period, and reduces the excessive power consumption of the high-voltage electrical system during the subsequent low-voltage battery recharging process, thereby ensuring the vehicle's endurance. In addition, if a second vehicle power-off signal or a vehicle power-on signal is received during the timer period, or if it is detected that the operating current of the low-voltage load is not greater than the operating current threshold or the high-voltage power supply status does not meet the preset power supply conditions, the high-voltage electrical system is immediately controlled to power off, saving energy consumption and protecting the equipment, which is conducive to ensuring system safety and stability.

[0092] According to an embodiment of the present invention, a vehicle is provided, such as Figure 3 As shown, the vehicle includes: a body domain controller 1, a high-voltage electrical system 4 and a low-voltage electrical system 5, wherein the low-voltage electrical system 5 includes a low-voltage load and a low-voltage battery.

[0093] Specifically, upon receiving the first vehicle power-off signal, the body domain controller 1 controls the low-voltage electrical system 5 to power off, and determines the high-voltage power supply status of the high-voltage electrical system 4 and the operating current of the low-voltage load. If it is detected that the operating current of the low-voltage load is greater than the operating current threshold and the high-voltage power supply status meets the preset power supply conditions, a timer is started, and the timer is used to delay the power-off of the high-voltage electrical system 4. During the timer period, the body domain controller 1 controls the high-voltage electrical system 4 to supply power to the low-voltage battery, and when the timer is completed, the high-voltage electrical system 4 is controlled to power off. This ensures that the low-voltage load operates normally during the timer period and can charge the low-voltage battery, reducing the excessive consumption of the high-voltage electrical system's power during the subsequent low-voltage battery charging process, thereby ensuring the vehicle's endurance.

[0094] In some optional embodiments, see again Figure 3 The vehicle also includes a power domain controller 2, which is used to respond to the request of the body domain controller and control the high-voltage electrical system 4 to power off.

[0095] In some optional embodiments, see again Figure 3The vehicle further includes a cabin domain controller 3, which is configured to respond to a first user operation by sending a first vehicle power-off signal to the body domain controller 1. The first operation is to control low-voltage loads to operate after the vehicle power-off. The cabin domain controller 3 is further configured to respond to a second user operation by sending a second vehicle power-off signal to the body domain controller 1. The second operation is to control low-voltage loads to not operate after the vehicle power-off.

[0096] In some optional embodiments, such as Figure 4 As shown, the high-voltage electrical system 4 may include a BMS and a DC / DC converter. The BMS can control the power supply process of the high-voltage battery. The low-voltage battery in the low-voltage electrical system 5 can be a battery, and the sensor 6 can be a battery sensor. The battery sensor is connected to the negative terminal of the battery and is used to collect information such as the battery charge / discharge current, battery voltage, and battery power, and feedback it to the body domain controller 1 via the LIN bus.

[0097] The following combination Figure 5 The specific application example shown is used to illustrate the vehicle power-off control method of the present invention.

[0098] Step S1: The vehicle body domain controller 1 integrates the power management module function and continuously receives the status signals of the high voltage electrical system 4 and the low voltage electrical system 5. Read the voltage value of the sensor 6 and the first current value I IBS And the second current value I of the DC / DC output DC / DC , judge the current working current I of the low-voltage load 总 .

[0099] In step S2, when the vehicle body domain controller 1 detects that the power gear is switched to the OFF gear, it controls the low-voltage electrical system 5 to power off. It should be noted that when the user controls the vehicle to power off through various operations such as the first operation and the second operation, the power gear will be switched to the OFF gear.

[0100] Step S3: When detecting that the power gear is switched to the OFF gear, the body domain controller 1 determines the vehicle power-off requirement scenario and sends a high-voltage power-off request signal.

[0101] Specifically, after determining the power system status, the vehicle body domain controller 1 issues a first high-voltage power-off request signal or a second high-voltage power-off request signal. The power system status includes the low-voltage load power consumption and the high-voltage electrical system status. The specific steps are as follows:

[0102] Step S31: determining the power consumption of the low-voltage load.

[0103] When the working current of the low voltage load I 总 Not greater than the operating current threshold I 阈值When the vehicle is in OFF gear, it is judged that the power consumption of the vehicle is small, the power consumption of the battery is small, and it is judged that there is no need for the high-voltage power-off delay control function.

[0104] When the working current of the low voltage load I 总 Greater than the operating current threshold I 阈值 When the vehicle is in OFF gear, it is judged that the load consumes a lot of power and consumes a lot of battery power, and it is judged that there is a need for high-voltage power-off delay control function.

[0105] Step S32: determine the status of the high-voltage electrical system.

[0106] Specifically, the body domain controller 1 determines the state of charge (SOC) of the high-voltage battery. Upon receiving the SOC signal from the BMS, if the SOC exceeds the state-of-charge threshold, the body domain controller 1 determines that the high-voltage battery SOC of the high-voltage electrical system meets the requirements for the high-voltage power-down delay control function. The body domain controller 1 also determines the low-voltage output state of the DC / DC converter in the high-voltage electrical system. If the DC / DC converter is in the buck state, the low-voltage output state of the DC / DC converter meets the requirements for the high-voltage power-down delay control function.

[0107] If the high-voltage battery SOC and the DC / DC low-voltage end output status both meet the high-voltage power-off delay control function requirements, it means that the high-voltage power supply status of the high-voltage electrical system meets the high-voltage power-off delay control function requirements.

[0108] In step S33 , when the body domain controller 1 determines that there is a requirement for the high-voltage power-off delay control function and the high-voltage electrical system status meets the requirement, it sends a first high-voltage power-off request signal, i.e., a high-voltage power-off T1 request signal, to the power domain controller 2 .

[0109] When the body domain controller 1 determines that there is a need for the high-voltage power-off delay control function, but the high-voltage electrical system status does not meet the high-voltage power-off delay control function requirement, it sends a second high-voltage power-off request signal, namely, a high-voltage power-off T0 request signal, to the power domain controller 2. Alternatively, when the body domain controller 1 determines that there is no need for the high-voltage power-off delay control function, but the high-voltage system status meets the high-voltage power-off delay control function requirement, it sends a high-voltage power-off T0 request signal to the power domain controller 2.

[0110] In step S4 , the power domain controller 2 receives a high voltage power-off request signal from the vehicle body domain controller 1 : a high voltage power-off T1 signal or a high voltage power-off T0 request signal.

[0111] Power domain controller 2 confirms the high voltage power on and off control strategy based on the received signal:

[0112] In step S41 , when the power domain controller 2 receives the high voltage power-off T0 request signal, it immediately controls the high voltage electrical system to power off.

[0113] In step S42, when the power domain controller 2 receives the high-voltage power-off T1 signal and, after a timeout of T1, controls the high-voltage electrical system to power off. After the body domain controller 1 issues the high-voltage power-off T1 request signal, it continuously monitors the power system status, collecting low-voltage load operating current, power level signals, and the high-voltage battery's SOC to ensure the power system can properly execute the high-voltage delayed power-off function. If the body domain controller 1 detects that the power system no longer meets the power supply requirements, it terminates the high-voltage delayed power-off function.

[0114] If, during time T1, the body domain controller 1 receives a soft-switch signal for power-off, or the DC / DC low-voltage output stops, the body domain controller 1 issues a high-voltage power-off T0 request signal. If, during time T1, the power domain controller 2 receives a high-voltage power-off T0 signal, it interrupts the timing and immediately powers off the high-voltage electrical system.

[0115] If the body domain controller 1 receives a power-on signal during time T1, it issues a high-voltage power-off request cancellation signal, terminating the delayed high-voltage power-off. If the power domain controller 2 receives a high-voltage power-off cancellation signal during time T1, it interrupts the timing and maintains the high-voltage power-on state.

[0116] In some embodiments, the power gear identification signal, high-voltage battery SOC, DC / DC low-voltage end output status, and low-voltage load operating current can be input into the body domain controller. Based on the above information, the body domain controller 1 determines whether to send a high-voltage power-off T0 request signal or a high-voltage power-off T1 request signal (and the target delay time T1 needs to be determined in combination with the working time of the low-voltage load after the vehicle is OFF), and sends a high-voltage power-off T0 request signal or a high-voltage power-off T1 request signal to the power domain controller 2. Upon receiving the high-voltage power-off T0 request signal, the power domain controller 2 will immediately control the high-voltage power-off, and the DC / DC low-voltage end will have no output. When the power domain controller receives the high-voltage power-off T1 request signal, the DC / DC low-voltage end outputs power during the timing T1, and then controls the high-voltage power-off after the timing T1.

[0117] In some optional implementations, when the user powers off the vehicle using the one-touch power-off soft switch on the vehicle computer, the cabin domain controller 3 sends a second vehicle power-off signal to the body domain controller 1. The body domain controller 1 then determines that the user has actively powered off the vehicle. In this scenario, the body domain controller 1 sends a second high-voltage power-off request signal (i.e., a high-voltage power-off T0 request, which the power domain controller 2 immediately executes) to the power domain controller 2.

[0118] Specifically, the vehicle computer is integrated into the cockpit domain controller 3, and a one-touch power-off soft switch is located on the vehicle computer control menu. When the user needs to immediately power off the vehicle, they press the one-touch power-off soft switch. The cockpit domain controller 3 sends a second vehicle power-off signal to the body domain controller 1 via the bus, indicating a rapid power-off. The body domain controller 1 recognizes this second vehicle power-off signal and controls the vehicle to power off the low-voltage side. Simultaneously, it sends a high-voltage power-off request to the power domain controller 2, which immediately controls the vehicle to power off the high-voltage side.

[0119] In some optional embodiments, when the user powers down the vehicle using the key or PE lock, the body domain controller 1 determines whether the user has left the vehicle based on the collected power-down reason signal. In this scenario, the body domain controller 1 issues a first high-voltage power-down request (i.e., a high-voltage power-down request signal T1, executed by the power domain controller 2 at time T1) to the power domain controller 2. During the delay T1, the high-voltage battery maintains power, providing power to the low-voltage loads through the DC / DC low-voltage output, while also charging the battery and increasing its SOC.

[0120] The present invention sets a high-voltage delayed power-off time T1 when the vehicle is in the OFF gear (which can be determined based on the load working time after the power is OFF). During the timing time T1, the vehicle body domain controller continuously monitors the power system status and determines whether the high-voltage power-off time is delayed based on the monitoring status, thereby reducing battery power consumption and performing a short-term charging of the battery.

[0121] Because the battery's charge and discharge capabilities are significantly reduced in low-temperature environments, this invention monitors the status of the high-voltage and low-voltage electrical systems and, based on load power requirements, delays high-voltage power-off. This reduces battery power consumption when the vehicle is parked, extending the vehicle's parking time, especially in low temperatures. Furthermore, to meet user needs for rapid high-voltage power-off in scenarios such as refueling and car washing, this invention implements a one-touch power-off soft switch to facilitate rapid power-off in specific scenarios.

[0122] This embodiment also provides a vehicle power-off control device for implementing the aforementioned embodiments and preferred implementations. Details already described will not be repeated. As used below, the term "module" may refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0123] This embodiment provides a vehicle power-off control device, wherein the low-voltage electrical system includes a low-voltage load and a low-voltage battery for supplying power to the low-voltage load, such as Figure 6 As shown, including:

[0124] The first processing module 601 is used to control the low-voltage electrical system to power off upon receiving the first vehicle power-off signal, and to determine the high-voltage power supply state of the high-voltage electrical system and the operating current of the low-voltage load;

[0125] The second processing module 602 is configured to, if it is detected that the operating current of the low-voltage load is greater than the operating current threshold and the high-voltage power supply state meets the preset power supply condition, start timing, and the timing is used to delay the power-off of the high-voltage electrical system;

[0126] The third processing module 603 is configured to control the high-voltage electrical system to supply power to the low-voltage battery during the timing period, and control the high-voltage electrical system to power off when the timing is completed.

[0127] In some optional embodiments, the high-voltage electrical system includes a high-voltage battery and a voltage converter, where the voltage converter is connected between the high-voltage battery and the low-voltage battery. The first processing module 601 is further configured to:

[0128] According to the voltage value of the low-voltage battery and the first working mode of the low-voltage battery, a corresponding method is selected to process the first current value of the low-voltage battery and the second current value output by the voltage converter to obtain the working current of the low-voltage load;

[0129] A high-voltage power supply state of the high-voltage electrical system is determined according to the state of charge of the high-voltage battery and the second operating mode of the voltage converter.

[0130] In some optional implementations, the first processing module 601 is further configured to:

[0131] If it is detected that the state of charge of the high-voltage battery is greater than the state of charge threshold and the second operating mode is the step-down mode, it is determined that the high-voltage power supply state of the high-voltage electrical system meets the preset power supply condition.

[0132] In some optional implementations, the first processing module 601 is further configured to:

[0133] If it is detected that the voltage value of the low-voltage battery is not greater than the voltage threshold and the first working mode is the power supply mode, the first current value is used as the working current of the low-voltage load; wherein the power supply mode is a mode in which the low-voltage battery alone supplies power to the low-voltage load;

[0134] If it is detected that the voltage value of the low-voltage battery is greater than the voltage threshold and the first operating mode is the charging mode, the operating current of the low-voltage load is obtained according to the sum of the first current value and the second current value; wherein the charging mode is a mode in which the low-voltage battery and the voltage converter jointly power the low-voltage load;

[0135] If it is detected that the voltage value of the low-voltage battery is greater than the voltage threshold and the first working mode is the discharge mode, the working current of the low-voltage load is obtained according to the difference between the second current value and the first current value; wherein, the discharge mode is a mode in which the low-voltage battery discharges and the voltage converter alone supplies power to the low-voltage load.

[0136] In some optional embodiments, the device is further used to:

[0137] When the second vehicle power-off signal is received during the timing period, the timing is stopped and the high-voltage electrical system is controlled to be powered off; wherein, the second vehicle power-off signal is a vehicle power-off signal that controls the low-voltage loads not to work after the vehicle is powered off at low voltage.

[0138] In some optional embodiments, the device is further used to:

[0139] When the vehicle power-on signal is received during the timing period, the timing is stopped and the high-voltage electrical system is kept powered on.

[0140] In some optional embodiments, the device is further used to:

[0141] If it is detected that the operating current of the low-voltage load is not greater than the operating current threshold or the high-voltage power supply status does not meet the preset power supply conditions, the high-voltage electrical system is controlled to be powered off.

[0142] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0143] The vehicle power-off control device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0144] The embodiment of the present invention also provides a vehicle body domain controller having the above Figure 6 The vehicle power-down control device shown.

[0145] See also Figure 7 , Figure 7 This is a schematic diagram of the structure of a vehicle body domain controller provided by an optional embodiment of the present invention. Figure 7As shown, the vehicle body domain controller includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed within the vehicle body domain controller, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple devices can be connected, each device providing part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 7 A processor 10 is taken as an example.

[0146] The processor 10 may be a central processing unit, a network processor, or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic, or any combination thereof.

[0147] The memory 20 stores instructions that can be executed by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0148] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created based on the use of the vehicle body domain controller, etc. In addition, the memory 20 may include a high-speed random access memory and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely located relative to the processor 10, and these remote memories may be connected to the vehicle body domain controller via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0149] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0150] The vehicle body domain controller further includes a communication interface 30 for the vehicle body domain controller to communicate with other devices or a communication network.

[0151] The embodiment of the present invention also provides a computer-readable storage medium. The above-mentioned method according to the embodiment of the present invention can be implemented in hardware, firmware, or implemented as a computer code that can be recorded in a storage medium, or implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state drive, etc.; further, the storage medium can also include a combination of the above-mentioned types of memory. It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0152] A portion of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the form in which the computer program instruction exists in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc. Accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium that can be accessed by the computer.

[0153] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A vehicle power-off control method, characterized in that: The method comprises: Upon receiving the first vehicle power-off signal, controlling the low-voltage electrical system to power off, and determining the high-voltage power supply state of the high-voltage electrical system and the operating current of the low-voltage load; If it is detected that the working current of the low-voltage load is greater than the working current threshold and the high-voltage power supply state meets the preset power supply conditions, timing is performed, and the timing is used to delay the power-off of the high-voltage electrical system; During the timing period, the high-voltage electrical system is controlled to supply power to the low-voltage battery, and when the timing is completed, the high-voltage electrical system is controlled to be powered off.

2. The vehicle power-off control method according to claim 1, characterized in that: The high-voltage electrical system includes a high-voltage battery and a voltage converter, wherein the voltage converter is connected between the high-voltage battery and the low-voltage battery. The method of determining the high-voltage power supply state of the high-voltage electrical system and the operating current of the low-voltage load includes: According to the voltage value of the low-voltage battery and the first working mode of the low-voltage battery, a corresponding method is selected to process the first current value of the low-voltage battery and the second current value output by the voltage converter to obtain the working current of the low-voltage load; A high-voltage power supply state of the high-voltage electrical system is determined according to the state of charge of the high-voltage battery and the second operating mode of the voltage converter.

3. The vehicle power-off control method according to claim 2, characterized in that: The determining, based on the state of charge of the high-voltage battery and the second operating mode of the voltage converter, the high-voltage power supply state of the high-voltage electrical system includes: If it is detected that the state of charge of the high-voltage battery is greater than the state of charge threshold and the second operating mode is the step-down mode, it is determined that the high-voltage power supply state of the high-voltage electrical system meets the preset power supply condition.

4. The vehicle power-off control method according to claim 2, characterized in that: The method of selecting a corresponding method to process the first current value of the low-voltage battery and the second current value output by the voltage converter according to the voltage value of the low-voltage battery and the first operating mode of the low-voltage battery to obtain the operating current of the low-voltage load includes: If it is detected that the voltage value of the low-voltage battery is not greater than the voltage threshold and the first working mode is the power supply mode, the first current value is used as the working current of the low-voltage load; wherein the power supply mode is a mode in which the low-voltage battery alone supplies power to the low-voltage load; If it is detected that the voltage value of the low-voltage battery is greater than the voltage threshold and the first operating mode is the charging mode, the operating current of the low-voltage load is obtained according to the sum of the first current value and the second current value; wherein the charging mode is a mode in which the low-voltage battery and the voltage converter jointly power the low-voltage load; If it is detected that the voltage value of the low-voltage battery is greater than the voltage threshold and the first working mode is the discharge mode, the working current of the low-voltage load is obtained according to the difference between the second current value and the first current value; wherein, the discharge mode is a mode in which the low-voltage battery discharges and the voltage converter alone supplies power to the low-voltage load.

5. The vehicle power-off control method according to any one of claims 1 to 4, characterized in that: The method further comprises: When the second vehicle power-off signal is received during the timing period, the timing is stopped and the high-voltage electrical system is controlled to be powered off; wherein, the second vehicle power-off signal is a vehicle power-off signal that controls the low-voltage loads not to work after the vehicle is powered off at low voltage.

6. The vehicle power-off control method according to any one of claims 1 to 4, characterized in that: The method further comprises: When a vehicle power-on signal is received within the timing period, the timing is stopped and the high-voltage electrical system is maintained in a powered-on state.

7. The vehicle power-off control method according to any one of claims 1 to 4, characterized in that: The method further comprises: If it is detected that the operating current of the low-voltage load is not greater than the operating current threshold or the high-voltage power supply status does not meet the preset power supply conditions, the high-voltage electrical system is controlled to be powered off.

8. A vehicle power-off control device, characterized in that: The device comprises: A first processing module is configured to control the low-voltage electrical system to power off upon receiving the first vehicle power-off signal, and to determine the high-voltage power supply state of the high-voltage electrical system and the operating current of the low-voltage load; A second processing module is configured to perform timing if it is detected that the operating current of the low-voltage load is greater than the operating current threshold and the high-voltage power supply state meets the preset power supply condition, wherein the timing is used to delay powering off the high-voltage electrical system; The third processing module is used to control the high-voltage electrical system to supply power to the low-voltage battery during the timing period, and to control the high-voltage electrical system to power off when the timing is completed.

9. A vehicle, characterized in that: include: Body domain controller, high-voltage electrical system and low-voltage electrical system; The vehicle body domain controller includes a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the vehicle power-off control method according to any one of claims 1 to 7 by executing the computer instructions.

10. The vehicle according to claim 9, characterized in that The vehicle further includes a power domain controller, which controls the high-voltage electrical system to power off in response to a request from the vehicle body domain controller.

11. The vehicle according to claim 9, characterized in that The vehicle further includes a cockpit domain controller, which, in response to a first operation of a user, sends a first vehicle power-off signal to the body domain controller, wherein the first operation is an operation of controlling the low-voltage load to operate after the vehicle is powered off at low voltage; The cockpit domain controller responds to the user's second operation and sends a second vehicle power-off signal to the body domain controller. The second operation is to control the low-voltage load to not work after the vehicle is powered off at low voltage.

12. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the vehicle power-off control method according to any one of claims 1 to 7.

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