CN-121989689-A - Control method and device for vehicle, electronic equipment and storage medium

CN121989689ACN 121989689 ACN121989689 ACN 121989689ACN-121989689-A

Abstract

The method comprises the steps of firstly outputting a low-power DCDC in a first output mode according to the state that a high-voltage system of the vehicle is electrified, regulating and controlling the output mode of the low-power DCDC according to a first control strategy to enable the vehicle to collide or power off the high-voltage system caused by OTA, timely supplying power to the vehicle through a low-voltage storage battery assisted by the low-power DCDC to avoid the situation that the whole vehicle is powered off, secondly outputting the low-power DCDC in a second output mode according to the state that the high-voltage system of the vehicle is in the power off state, regulating and controlling the output mode of the low-power DCDC according to a second control strategy to enable or stop the low-power DCDC to work according to the low-voltage load power current and the battery state, and avoiding the high electric energy loss of the low-power DCDC caused by the fact that the low-power DCDC is always in a working state.

Inventors

JIA FENGTAO
WANG SHUAI
WANG DALI
FU XIANG

Assignees

奇瑞汽车股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260106

Claims (10)

1. The utility model provides a control method of vehicle, characterized by is applied to the power supply system of vehicle, sets up low-power DCDC in the high-voltage battery package of power supply system, low-power DCDC one end is connected with the high-voltage battery in the high-voltage battery package electricity, and the other end is as the output of high-voltage battery package, with low-voltage load nature connection, includes: The method comprises the steps of acquiring a first signal of the vehicle, wherein the first signal is used for indicating that the vehicle is in an electrified state or a powered-off state; determining an output mode of the low-power DCDC according to a first signal of the vehicle, wherein the output mode comprises a first output mode and a second output mode, the first output mode is used for indicating the low-power DCDC to output a first voltage in a constant voltage mode, and the second output mode is used for indicating the low-power DCDC to output a second voltage in the constant voltage mode, and the second voltage is larger than the first voltage; The control strategy is a first control strategy or a second control strategy, wherein the first control strategy is used for indicating that the output mode for supplying power to the vehicle is determined according to the output power of the low-power DCDC and the power consumption voltage of the low-voltage load; And powering the vehicle according to the control strategy.
2. The method of claim 1, wherein determining the output mode of the low power DCDC based on the first signal of the vehicle comprises: If the first signal indicates that the vehicle is in a power-on state, determining that the output mode of the low-power DCDC is the first output mode; And if the first signal indicates that the vehicle is in a power-off state, determining that the output mode of the low-power DCDC is the second output mode.
3. The method of claim 2, wherein when the low power DCDC is in the first output mode, the control strategy of the low power DCDC is a first control strategy, the determining the output mode for powering the vehicle based on the output power of the low power DCDC and the power usage and the voltage usage of the low voltage load, the method comprising: the second signal is used for indicating that the vehicle is in an electrified state and in a low-high-voltage state; According to the second signal, the output voltage of the first output mode is adjusted from the first voltage to a third voltage, wherein the third voltage is larger than the first voltage and smaller than the second voltage; Acquiring the output power of the low-power DCDC, the power consumption power and the power consumption voltage of the low-voltage load; And if the electric power is smaller than the output power or the electric power is larger than the output power and the electric voltage is larger than the working voltage of the low-voltage load, the low-power DCDC supplies power to the vehicle in a first output mode with the output voltage as a third voltage.
4. The method of claim 2, wherein when the low power DCDC is in the second output mode, the control strategy of the low power DCDC is the second control strategy, the output mode for powering the vehicle is determined based on the output current and the output voltage of the low power DCDC, the method comprising: acquiring the output end current of the low-power DCDC; And if the output end current is smaller than a first current threshold value, the low-power DCDC is switched from a second output mode to a dormant mode.
5. The method of claim 4, wherein after said obtaining the output current of the low power DCDC, the method further comprises: If the output end current is larger than the second current threshold value, acquiring a first duration time when the output end current of the low-power DCDC is larger than the second current threshold value; And sending a first request instruction to the vehicle according to the fact that the first duration time is larger than a first time threshold value, wherein the first request instruction is used for indicating that the vehicle is switched to an electrified state.
6. The method of claim 4, wherein the output mode of the low power DCDC further comprises a third output mode, the third output mode being configured to instruct the low power DCDC to output the first current in a constant current mode, the method further comprising, after switching the low power DCDC from the second output mode to the sleep mode: Periodically obtaining the output end voltage of the low-power DCDC; If the output terminal voltage is smaller than or equal to the third voltage, the low-power DCDC is switched from the dormant mode to a third output mode; the low power DCDC powers the vehicle in the third output mode.
7. The method of claim 6, wherein after the low power DCDC powers the vehicle in a third output mode, the method further comprises: if the output end voltage of the low-power DCDC is larger than the second voltage, the low-power DCDC is switched from the third output mode to the second output mode; The low power DCDC powers the vehicle in the second output mode.
8. A control device for a vehicle, characterized by being applied to a power supply system of the vehicle, in which a low-power DCDC is provided in a high-voltage battery pack of the power supply system, one end of the low-power DCDC is electrically connected to a high-voltage battery in the high-voltage battery pack, and the other end of the low-power DCDC is electrically connected to a low-voltage load as an output end of the high-voltage battery pack, the device comprising: the system comprises a first acquisition module, a first control module and a second acquisition module, wherein the first acquisition module is used for acquiring a first signal of the vehicle, and the first signal is used for indicating that the vehicle is in an electrified state or a powered-off state; the first control module is used for determining an output mode of the low-power DCDC according to a first signal of the vehicle, wherein the output mode comprises a first output mode and a second output mode, the first output mode is used for indicating the low-power DCDC to output a first voltage in a constant voltage mode, and the second output mode is used for indicating the low-power DCDC to output a second voltage in the constant voltage mode, and the second voltage is larger than the first voltage; The system comprises a low-power DCDC, a first control module, a second control module and a control module, wherein the low-power DCDC is used for outputting a power supply mode of a vehicle, the second control module is used for determining a control strategy of the low-power DCDC according to the output mode, the control strategy is a first control strategy or a second control strategy, the first control strategy is used for indicating that the power supply mode of the vehicle is determined according to the output power of the low-power DCDC and the power consumption power and the power consumption voltage of the low-voltage load, and the second control strategy is used for indicating that the power supply mode of the vehicle is determined according to the output end current and the output end voltage of the low-power DCDC; And the third control module is used for supplying power to the vehicle according to the control strategy.
9. An electronic device, the electronic device comprising: A processor; A memory having stored thereon computer readable instructions which, when executed by the processor, implement the control method of any of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a program code, which is callable by a processor or an electronic device to perform the control method according to any one of claims 1 to 7.

Description

Control method and device for vehicle, electronic equipment and storage medium Technical Field The present application relates to the field of electric vehicle power supply technologies, and in particular, to a vehicle control method, device, electronic apparatus, and storage medium. Background In a parking or driving state of an electric automobile, energy mainly comes from a power battery, electric energy of a low-voltage load is provided by a 12V direct current-direct current ConVerter (DC-to-DC ConVerter, DCDC) from high voltage to low voltage, the DCDC supplies power to the low-voltage load or charges a low-voltage storage battery, and the storage battery can also discharge after being charged and provide electric energy to the low-voltage load. The low-voltage load power consumption of the electric automobile is saved, the power consumption of a power battery can be reduced, and the endurance mileage is prolonged. In order to reduce low-voltage load energy consumption when the vehicle is parked, low-power DCDC can be added to a power supply system of the vehicle, the low-power DCDC keeps working frequently when the vehicle is in an OFF gear, and when the low-power DCDC works, the whole vehicle network does not need to wake up, and 12V electric energy is directly converted from a high-voltage battery to supply power to the low-voltage load, so that energy consumption is saved. However, in the case that the DCDC with low power is added to the power supply system of the vehicle, when the vehicle is in the high-voltage state ON the ON gear, the vehicle fails to cause high-voltage power failure or is in the OTA (OVer-the-Air Technology) state, and a low-voltage power failure of the whole vehicle may occur, or when the vehicle is in the OFF gear and the load current is small, a situation that the electric energy loss is large may occur. Disclosure of Invention In view of this, the embodiments of the present application provide a method, an apparatus, an electronic device, and a storage medium for controlling a vehicle, which can avoid a low-voltage power failure of the whole vehicle when the low-voltage battery is low or damaged, and reduce the electric energy loss caused by low-power DCDC when the load of the whole vehicle uses a smaller current. The application adopts the following technical scheme. In a first aspect, an embodiment of the present application provides a control method for a vehicle, applied to a power supply system of the vehicle, where a low-power DCDC is set in a high-voltage battery pack of the power supply system, one end of the low-power DCDC is electrically connected to a high-voltage battery in the high-voltage battery pack, and the other end of the low-power DCDC is used as an output end of the high-voltage battery pack and is connected to a low-voltage load, where the method includes: The method comprises the steps of obtaining a first signal of a vehicle, wherein the first signal is used for indicating that the vehicle is in an electrified state or a powered-off state, determining an output mode of a low-power DCDC according to the first signal of the vehicle, the output mode comprises a first output mode and a second output mode, the first output mode is used for indicating that the low-power DCDC outputs a first voltage in a constant voltage mode, the second output mode is used for indicating that the low-power DCDC outputs a second voltage in the constant voltage mode, the second voltage is larger than the first voltage, determining a control strategy of the low-power DCDC according to the output mode, wherein the control strategy is a first control strategy or a second control strategy, the first control strategy is used for indicating that the output mode for supplying power to the vehicle is determined according to the output power of the low-power DCDC and the power consumption voltage of a low-voltage load, and the second control strategy is used for indicating that the output mode for supplying power to the vehicle is determined according to the output end current and the output end voltage of the low-power DCDC. In some embodiments, determining an output mode of the low power DCDC based on a first signal of the vehicle comprises: And if the first signal indicates that the vehicle is in a power-on state, determining that the output mode of the low-power DCDC is a first output mode, and if the first signal indicates that the vehicle is in a power-off state, determining that the output mode of the low-power DCDC is a second output mode. In some embodiments, when the low power DCDC is in the first output mode, the control strategy of the low power DCDC is the first control strategy, and the output mode for powering the vehicle is determined according to the output power of the low power DCDC and the power usage and the voltage usage of the low voltage load, the method includes: The method comprises the steps of obtaining a second signal of a vehicle, wherein the second sign