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

Abstract

The invention relates to the technical field of vehicle control, and discloses a vehicle power-off control method and device, a vehicle and a storage medium. When a first whole vehicle power-off signal that a low-voltage load needs to work after whole vehicle low-voltage power-off is recognized, a low-voltage electrical system is controlled to be powered off firstly; if the working current of the low-voltage load is larger than the working current threshold value and the high-voltage power supply state meets the preset power supply condition, it is indicated that the whole vehicle has the delayed power-off requirement of the high-voltage electrical system, and the high-voltage electrical system can meet the delayed power-off requirement, timing is started, the power-on state of the high-voltage electrical system is maintained in the timing period, and the high-voltage electrical system is powered off. And when timing is completed, the high-voltage electrical system is controlled to be powered off. Therefore, the high-voltage electrical system supplies power to the low-voltage battery in the timing period, and the low-voltage load is ensured to work normally in the delay period. And the low-voltage battery can be charged in advance, excessive consumption of electric quantity of the high-voltage electrical system in the charging process of the low-voltage battery is reduced, and the cruising ability of the vehicle is guaranteed.

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 are rapidly developing towards new energy, electrification and intelligence, vehicle functions are becoming more and more abundant, such as accompanying the vehicle home with headlights, delayed shutdown of the entertainment system, and smart guest transportation. However, many of these 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] When receiving the first vehicle power-off signal, control the low-voltage electrical system to power off, and determine the high-voltage power supply state of the high-voltage electrical system and the working 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 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;

[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 a 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. In addition, the low-voltage battery can be charged in advance to reduce the excessive consumption of power in the high-voltage electrical system during the low-voltage battery charging process, thereby ensuring the vehicle's endurance.

[0010] In an optional embodiment, 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, 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 charge state of the high voltage battery and the second operating mode of the voltage converter.

[0013] Beneficial effects: The present invention determines the working current of the low-voltage load through the first current value of the low-voltage battery and the second current value output by the voltage converter, and then determines whether the low-voltage load has a high-voltage delayed power-off requirement. In addition, the high-voltage power supply state of the high-voltage electrical system is determined through the charge state of the high-voltage battery and the second working mode of the voltage converter, so as to determine whether the high-voltage electrical system can meet the high-voltage delayed power-off requirement.

[0014] In an optional implementation, determining the high voltage power supply state of the high voltage electrical system according to the charge state of the high voltage battery and the second working 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 voltage reduction 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 supply power to 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 implementation, 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, 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 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 supply power to 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 relationship between the voltage value of the low-voltage battery and the voltage threshold and the first working mode of the low-voltage battery, and calculates the working current of the low-voltage load in combination with the actual working conditions, thereby accurately judging 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 load to not 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, the timing is interrupted and the high-voltage electrical system is immediately controlled 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 working current of the low-voltage load is not greater than the working 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 effect: When the present invention detects that the working current of the low-voltage load is not greater than the working current threshold, it indicates that the low-voltage load does not have a high power demand, and controls the high-voltage electrical system to immediately power off, thereby achieving energy saving. If it is detected that the low-voltage power supply state does not meet the preset power supply conditions, the high-voltage electrical system is also controlled to immediately power 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 used to control the low-voltage electrical system to power off when receiving the first vehicle power-off signal, and determine the high-voltage power supply state of the high-voltage electrical system and the working 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 condition, and 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 vehicle body domain controller, a high voltage electrical system and a low voltage electrical system;

[0036] The 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 responds to a first operation of the user and 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 work 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 a 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. In addition, the low-voltage battery can be charged in advance to reduce the excessive consumption of electricity of the high-voltage electrical system during the low-voltage battery charging process, thereby ensuring the vehicle's endurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying 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 It is a schematic diagram of the hardware structure of the vehicle body domain controller according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the 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 creative work are 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 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 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 working current of the low-voltage load.

[0055] Specifically, the vehicle includes a high-voltage electrical system and a low-voltage electrical system, and 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 on 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, are still working while the vehicle is parked.

[0057] In step S101, after receiving the first vehicle power-off signal, the vehicle main control module, such as the body domain controller, powers off the low-voltage electrical system, and after the low-voltage electrical system is powered off, the low-voltage battery will still supply power to some low-voltage loads, so that these loads can continue to work after the vehicle is turned off, so the low-voltage loads will still have working current after the low-voltage system is powered off. Among them, the first vehicle power-off signal is a vehicle power-off signal that controls the low-voltage loads to work after the vehicle is powered off at low voltage.

[0058] Specifically, the 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 working mode, and the electrical parameters of the low-voltage battery, such as the voltage, current, and the first working mode, can be obtained, and then the high-voltage power supply state of the high-voltage electrical system and the working current of the low-voltage load can be obtained. Among them, 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 power management system (Battery Management System, BMS), and the present invention is not limited to this.

[0059] In some optional embodiments, before step S101, when the cockpit detects the second operation of the user, 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 where the vehicle is parked for a long time or the vehicle is under 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. Among them, 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] Step S102, 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 condition, timing is performed, and the timing is used to delay the power-off of the high-voltage electrical system.

[0061] In step S102, when the working current I 总 Not greater than the working 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 working current I of the low voltage load is 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 according to the 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 power off. The start time of the timing is: the time when the timing is started, and the completion time of the timing can be: the time when the time interval from the start of the timing is the target delay time.

[0065] In addition, since the charging and discharging capabilities of low-voltage batteries are greatly weakened in low-temperature environments, if the low-voltage battery power is consumed too much during parking, even if the low-voltage battery can be intelligently recharged at low temperatures, the recharge efficiency is low, resulting in the high-voltage battery consuming more power, seriously affecting the vehicle's endurance at low temperatures. This embodiment charges the low-voltage battery by delaying the power-off of the high-voltage electrical system, so there is no need to recharge when the low-voltage battery power is seriously insufficient, avoiding excessive power consumption of the high-voltage electrical system due to low recharge efficiency, which is beneficial to maintaining the vehicle's power status, thereby ensuring 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, so as to dynamically control the delay of high-voltage power-off according to the actual state of the vehicle power system, ensure that the low-voltage load can maintain normal operation during the delay process, and charge 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 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 power-on state of the high-voltage electrical system is maintained 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. And the low-voltage battery can be charged in advance, reducing the excessive consumption of the high-voltage electrical system during the power replenishment process, and ensuring the vehicle's endurance.

[0068] In this embodiment, a vehicle power-off control method is provided. Figure 2 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, when 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 working 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 value 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 alone to supply power to the low-voltage load, and the low-voltage battery is in power supply mode. At this time, the working current of the low-voltage load 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 and 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 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 value of the low-voltage battery is higher than 13.5V, the low-voltage end of the voltage converter has an output, and when 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 the discharge mode. At this time, the working current 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 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.

[0079] Step S2012, determining the high voltage power supply state of the high voltage electrical system according to the charge state of the high voltage battery and the second working 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, and 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 BMS or a sensor, and then the power supply status of the high-voltage electrical system can be obtained according to the charge state of the high-voltage battery and the second working mode.

[0081] In step S2012, 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 working 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 conditions. By detecting the state of charge of the high-voltage battery and the second working mode, it is determined whether the state of the high-voltage battery can supply power to the low-voltage battery, thereby avoiding over-discharge of the high-voltage battery when it does not meet the preset power supply conditions, which is safer.

[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 power off, thereby protecting the equipment and ensuring system safety and stability.

[0083] The present invention determines the working current of the low-voltage load through the first current value of the low-voltage battery and the second current value output by the voltage converter, and then determines whether the low-voltage load has a high-voltage delayed power-off requirement. In addition, the high-voltage power supply state of the high-voltage electrical system is determined through the charge state of the high-voltage battery and the second working mode of the voltage converter, so as to determine 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 condition, a timer is started, and the timer is used to delay the power-off of the high-voltage electrical system. Figure 1 The specific 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 specific 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 a 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 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.

[0088] Step S205, when a vehicle power-on signal is received during 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 implementations, during the timing period, the high-voltage electrical system and the low-voltage electrical system are continuously monitored, and the current of the low-voltage load, the vehicle power gear signal, and the SOC of the high-voltage battery are collected to determine whether to continue the high-voltage delayed power-off. For example, if during the timing period, the low-voltage end of the voltage converter stops outputting or the state of charge of the high-voltage battery is greater than the state of charge threshold, indicating that the high-voltage power supply state 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 is no longer performed.

[0091] The vehicle power-off control method provided in this embodiment, when the first vehicle power-off signal is identified, first controls the low-voltage electrical system to power off. If it is detected that the vehicle has a delayed power-off demand for the high-voltage electrical system based on the working current of the low-voltage load and the high-voltage power supply state of 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 power-on state of the high-voltage electrical system is maintained during the timing period. When the timing is completed, the high-voltage electrical system is controlled to power off. Thereby ensuring that the low-voltage load works normally during the delay period, and reducing the excessive consumption of the high-voltage electrical system power during the subsequent low-voltage battery charging process, and ensuring the vehicle's endurance. In addition, if during the timing period, a second vehicle power-off signal or a vehicle power-on signal is received, or it is detected that the working current of the low-voltage load is not greater than the working current threshold or the high-voltage power supply state does not meet the preset power supply conditions, then the high-voltage electrical system is immediately controlled to power off immediately, saving energy consumption, and protecting the equipment, which is conducive to ensuring the safety and stability of the system.

[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, when the body domain controller 1 receives the first vehicle power-off signal, it controls the low-voltage electrical system 5 to power off, and determines the high-voltage power supply state of the high-voltage electrical system 4 and the working 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 4. During the timing period, the body domain controller 1 controls the high-voltage electrical system 4 to power the low-voltage battery, and when the timing is completed, the high-voltage electrical system 4 is controlled to power off. Thereby ensuring that the low-voltage load works normally during the timing period, and the low-voltage battery can be charged, reducing the excessive consumption of the high-voltage electrical system power during the subsequent low-voltage battery charging process, and 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 cockpit domain controller 3, which is used to respond to a first operation of the user and send a first vehicle power-off signal to the body domain controller 1, wherein the first operation is an operation for controlling the low-voltage load to work after the vehicle is powered off at low voltage. The cockpit domain controller 3 is also used to respond to a second operation of the user and send a second vehicle power-off signal to the body domain controller 1, wherein the second operation is an operation for controlling the low-voltage load not to work after the vehicle is powered off at low voltage.

[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, and the BMS may control the power supply process of the high-voltage battery. The low-voltage battery in the low-voltage electrical system 5 may be a storage battery, and the sensor 6 may be a storage battery sensor, which is connected to the negative terminal of the storage battery and is used to collect information such as the battery charge / discharge current, battery voltage, and power, and feed it back to the vehicle body domain controller 1 through the LIN bus.

[0097] Combine the following 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 and the first current value I of the sensor 6. IBS And the second current value I of the DC / DC output DC / DC , determine the current working current I of the low-voltage load 总 .

[0099] Step S2, when the vehicle body domain controller 1 detects that the power gear is switched to OFF, 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 OFF.

[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 judging the power system status, the vehicle body domain controller 1 sends a first high-voltage power-off request signal or a second high-voltage power-off request signal, wherein the power system power 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 working current threshold I 阈值When the vehicle is in OFF gear, it is judged that the power consumption is small and the battery power consumption is small, and it is judged that there is no need for 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, judging the status of the high voltage electrical system.

[0106] Specifically, the body domain controller 1 determines the SOC of the high-voltage battery. After receiving the SOC signal from the BMS, if the SOC is greater than the state of charge threshold, the body domain controller 1 determines that the SOC of the high-voltage battery of the high-voltage electrical system meets the requirements of the high-voltage power-down delay control function. The body domain controller 1 determines the low-voltage output state of the DC / DC of the high-voltage electrical system. When the DC / DC is in the BUCK state, it determines that the low-voltage output state of the DC / DC meets the requirements of 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] Step S33, when the body domain controller 1 determines that there is a high-voltage power-off delay control function requirement, and the high-voltage electrical system state meets the high-voltage power-off delay control function requirement, a first high-voltage power-off request signal, i.e., a high-voltage power-off T1 request signal, is sent to the power domain controller 2.

[0109] When the body domain controller 1 determines that there is a demand 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, a second high-voltage power-off request signal, i.e., a high-voltage power-off T0 request signal, is sent to the power domain controller 2. Alternatively, when the body domain controller 1 determines that there is no demand 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, a high-voltage power-off T0 request signal is sent to the power domain controller 2.

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

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

[0112] 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] Step S42, when the power domain controller 2 receives the high-voltage power-off T1 signal, after the timing T1, the high-voltage electrical system is controlled to power off. After the body domain controller 1 sends the high-voltage power-off T1 request signal, it continuously monitors the power system status, collects the low-voltage load working current, the power gear signal and the SOC of the high-voltage battery, and ensures that the power system can normally perform the high-voltage delayed power-off function. If the body domain controller 1 detects that the power system status no longer meets the power supply conditions, it terminates the high-voltage delayed power-off function.

[0114] When the body domain controller 1 receives a one-button power-off soft switch signal during the timing T1, or the DC / DC low-voltage end stops outputting, the body domain controller 1 sends a high-voltage power-off T0 request signal. If the power domain controller 2 receives a high-voltage power-off T0 signal during the timing T1, the timing is interrupted and the high-voltage electrical system is immediately controlled to power off.

[0115] When the body domain controller 1 receives the power gear ON signal during the timing T1, the body domain controller 1 sends a high-voltage power-off request cancellation signal to terminate the high-voltage delayed power-off. If the power domain controller 2 receives the high-voltage power-off cancellation signal during the timing T1, the timing is interrupted and the high-voltage power-on state is maintained.

[0116] In some embodiments, the power gear identification signal, the high-voltage battery SOC, the DC / DC low-voltage end output status, and the working current of the low-voltage load 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 through the one-button power-off soft switch, the cockpit domain controller 3 sends a second vehicle power-off signal to the body domain controller 1, and the body domain controller 1 determines that the user actively powers off the vehicle in 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 is immediately executed by the power domain controller 2) to the power domain controller 2.

[0118] Specifically, the vehicle computer is integrated in the cockpit domain controller 3, and the one-button power-off soft switch is set on the vehicle computer control menu. When the user needs to power off the vehicle immediately, press the one-button power-off soft switch, and the cockpit domain controller 3 sends the second vehicle power-off signal for rapid power-off to the body domain controller 1 through the bus. The body domain controller 1 recognizes the second vehicle power-off signal for rapid power-off, controls the vehicle to power off the low-voltage side, and sends the high-voltage power-off demand to the power domain controller 2, and the power domain controller 2 immediately controls the vehicle to power off the high voltage side.

[0119] In some optional implementations, when the user powers off the vehicle by key or PE lock, the body domain controller 1 determines that the user has left the vehicle to power off based on the collected power-off reason signal. In this scenario, the body domain controller 1 sends a first high-voltage power-off request (i.e., high-voltage power-off T1 request signal, and the power domain controller 2 executes timing T1) to the power domain controller 2. During the delay T1, the high-voltage battery maintains power supply, and provides power consumption of the low-voltage load through the DC / DC low-voltage end output, while charging the battery to increase the SOC value of the battery.

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

[0121] Since the battery's charging and discharging receiving capacity is greatly weakened in a low-temperature environment, the present invention monitors the status of the high-voltage electrical system and the low-voltage electrical system, and performs delayed control of high-voltage power-off according to the load power demand, thereby ensuring that the battery consumes less power when the vehicle is parked and extending the parking time of the vehicle, especially in low temperatures. In order to meet the user's need for fast high-voltage power-off in some scenarios such as refueling and car washing, the present invention uses a one-button power-off soft switch button to meet the fast power-off demand in specific scenarios.

[0122] In this embodiment, a vehicle power-off control device is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can be 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, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[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 when receiving the first vehicle power-off signal, and determine the high-voltage power supply state of the high-voltage electrical system and the working current of the low-voltage load;

[0125] The second processing module 602 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 condition, and the timing is used to delay the power-off of the high-voltage electrical system;

[0126] The third processing module 603 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.

[0127] In some optional embodiments, 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, and the first processing module 601 is further used for:

[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 charge state 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 voltage reduction 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 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 supply power to 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 also used for:

[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 load to not work after the vehicle is powered off at low voltage.

[0138] In some optional embodiments, the device is also used for:

[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 also used for:

[0141] If it is detected that the working current of the low-voltage load is not greater than the working 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 is a schematic diagram of the structure of a vehicle body domain controller provided by an optional embodiment of the present invention, such as 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 in 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, and each device provides 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 a dedicated 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 executable 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 applications required for at least one function; the data storage area may store data created according to 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-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged 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 method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, 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 hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. 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 part 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 existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and 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 accessible to the computer.

[0153] Although the embodiments of the present invention have been described in conjunction with 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, and 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: When receiving the first vehicle power-off signal, control the low-voltage electrical system to power off, and determine the high-voltage power supply state of the high-voltage electrical system and the working 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 condition, 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 charge state 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 step of 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 working mode of the voltage converter comprises: 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 voltage reduction 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 working mode of the low-voltage battery to obtain the working 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 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 supply 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 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 load to not 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 during 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 working current of the low-voltage load is not greater than the working 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 used to control the low-voltage electrical system to power off when receiving the first vehicle power-off signal, and to determine the high-voltage power supply state of the high-voltage electrical system and the working current of the low-voltage load; A 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 condition, and the timing is used to delay the power-off of 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 responds to a first operation of a user and sends a first vehicle power-off signal to the vehicle body domain controller, wherein the first operation is an operation of controlling the low-voltage load to work after the vehicle is powered off at low voltage; The cockpit domain controller responds to a second operation of the user and sends a second vehicle power-off signal to the body domain controller, wherein the second operation is an operation of controlling 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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