CN-114584015-B - Method, device, vehicle and storage medium for controlling motor

CN114584015BCN 114584015 BCN114584015 BCN 114584015BCN-114584015-B

Abstract

The present disclosure relates to a method, apparatus, vehicle, and storage medium for motor control. The method comprises the steps of obtaining a motor driving system state of a vehicle, obtaining the motor rotating speed of the vehicle under the condition that the motor driving system state is a preset electric driving system state, and controlling the motor driving system to enter a safety mode according to the motor rotating speed, namely flexibly controlling the motor driving system to enter an active short circuit mode or a safety pulse turn-off mode according to the motor rotating speed. Therefore, under the condition that the vehicle motor is in a static state, the vehicle can be prevented from moving, the safety of the whole vehicle and personnel in the vehicle can be ensured, under the condition that the vehicle motor is in a rotating state, the problem that the vehicle is difficult to push or pull due to braking torque generated by an active short circuit mode can be avoided, meanwhile, the damage of back electromotive force voltage generated after the rotation speed of the motor to the vehicle and the personnel in the vehicle can be avoided, and the safety of the vehicle is improved.

Inventors

CHENG LIPIN
FENG XIAOGANG
LI QIANG
Song Zongli
TIAN JIAYU
HAN FENG
GAO ZELIN
SHAN HONGYAN

Assignees

长城汽车股份有限公司

Dates

Publication Date: 20260508
Application Date: 20201202

Claims (10)

1. A method of controlling an electric machine, the method comprising: acquiring a motor driving system state of a vehicle; Acquiring the motor rotation speed of the vehicle under the condition that the motor driving system state is a preset electric driving system state, wherein the preset electric driving system state comprises any one of a non-high-voltage state, a high-voltage pre-charge state and a high-voltage standby state; Controlling the motor driving system to enter a safety mode according to the motor rotating speed, wherein the safety mode comprises one of an active short circuit mode and a safety pulse turn-off mode; In the case that the motor drive system state is the no-high-voltage state or the high-voltage precharge state, the controlling the motor drive system to enter a safe mode according to the motor rotation speed includes: And controlling the motor driving system to enter an active short circuit mode under the condition that the motor rotating speed is smaller than or equal to a preset rotating speed threshold value.
2. The method of claim 1, wherein, in the event that the motor drive system state is the no high voltage state or the high voltage precharge state, the controlling the motor drive system to enter a safe mode in accordance with the motor speed comprises: and under the condition that the motor rotating speed is larger than the preset rotating speed threshold value, acquiring a back electromotive force voltage according to the motor rotating speed, and controlling the motor driving system to enter a safety mode according to the back electromotive force voltage.
3. The method of claim 2, wherein controlling the motor drive system into a safe mode in accordance with the back emf voltage comprises: and under the condition that the back electromotive force voltage is smaller than a preset voltage threshold value, controlling the motor driving system to enter a safety pulse cut-off mode.
4. The method of claim 3, wherein controlling the motor drive system to enter a safe mode based on the back EMF voltage further comprises, in the event that the back EMF voltage is greater than or equal to the preset voltage threshold, If the state of the motor driving system is the state without high voltage, controlling the motor driving system to enter an active short circuit mode, or And if the state of the motor driving system is the high-voltage pre-charging state, acquiring the high-voltage bus voltage of the vehicle, and controlling the motor driving system to enter a safety mode according to the counter electromotive force voltage and the high-voltage bus voltage.
5. The method of claim 4, wherein controlling the motor drive system into a safe mode based on the back emf voltage and the high-voltage bus voltage comprises: Controlling the motor driving system to enter an active short circuit mode under the condition that the back electromotive force voltage is greater than or equal to the high-voltage bus voltage, or And under the condition that the back electromotive force voltage is smaller than the high-voltage bus voltage, controlling the motor driving system to enter a safety pulse turn-off mode.
6. The method according to claim 1, wherein in the case where the motor drive system state is the high-voltage standby state, before controlling the motor drive system to enter a safe mode in accordance with the motor rotation speed, the method further comprises: Acquiring the high-voltage bus voltage of the vehicle; The controlling the motor driving system to enter a safe mode according to the motor rotation speed comprises: Acquiring back electromotive force voltage according to the rotating speed of the motor; And controlling the motor driving system to enter an active short circuit mode under the condition that the back electromotive force voltage is larger than or equal to the high-voltage bus voltage, or controlling the motor driving system to enter a safety pulse turn-off mode under the condition that the back electromotive force voltage is smaller than the high-voltage bus voltage.
7. The method according to any one of claims 1 to 6, characterized in that before the acquiring the motor drive system state of the vehicle, the method further comprises: determining whether a motor drive system of the vehicle is in a fault state; the acquiring the motor drive system state of the vehicle includes: and acquiring the state of the motor drive system of the vehicle under the condition that the motor drive system is in a non-fault state.
8. An apparatus for controlling an electric motor, the apparatus comprising: The motor driving system state acquisition module is used for acquiring the motor driving system state of the vehicle; a motor rotation speed obtaining module, configured to obtain a motor rotation speed of the vehicle when the motor driving system state is a preset electric driving system state, where the preset electric driving system state includes any one of a no-high-voltage state, a high-voltage precharge state, and a high-voltage standby state; the safety mode control module is used for controlling the motor driving system to enter a safety mode according to the motor rotating speed, wherein the safety mode comprises one of an active short circuit mode and a safety pulse turn-off mode; the safety mode control module is used for controlling the motor driving system to enter an active short circuit mode if the motor rotating speed is smaller than or equal to a preset rotating speed threshold value under the condition that the motor driving system is in the no-high-voltage state or the high-voltage pre-charging state.
9. A vehicle, characterized in that the vehicle comprises: The motor control apparatus of claim 8.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 7.

Description

Method, device, vehicle and storage medium for controlling motor Technical Field The present disclosure relates to the field of vehicles, and in particular, to a method, apparatus, vehicle, and storage medium for motor control. Background Permanent magnet synchronous motors are widely adopted in electric vehicles at present, and have the advantages of low loss, fast dynamic response, small moment of inertia, high power density and the like, but back electromotive voltage can be generated in the running process of the motor, and the back electromotive voltage is too high to cause damage to the vehicles and personnel in the vehicles. Disclosure of Invention In order to solve the above-mentioned problems, the present disclosure provides a motor control method, apparatus, vehicle, and storage medium. In a first aspect, the present disclosure provides a method for controlling a motor, the method including obtaining a motor driving system state of a vehicle, obtaining a motor rotation speed of the vehicle in a case that the motor driving system state is a preset electric driving system state, wherein the preset electric driving system state includes any one of a no-high-voltage state, a high-voltage pre-charge state, and a high-voltage standby state, and controlling the motor driving system to enter a safety mode according to the motor rotation speed, wherein the safety mode includes one of an active short-circuit mode and a safety pulse off mode. Optionally, in the case that the motor drive system state is the no-high-voltage state or the high-voltage pre-charge state, the controlling the motor drive system to enter the safety mode according to the motor rotation speed includes: Controlling the motor driving system to enter an active short circuit mode under the condition that the motor rotating speed is smaller than or equal to a preset rotating speed threshold value; Or under the condition that the motor rotating speed is larger than the preset rotating speed threshold value, acquiring back electromotive force voltage according to the motor rotating speed, and controlling the motor driving system to enter a safety mode according to the back electromotive force voltage. Optionally, controlling the motor drive system to enter a safety mode according to the back emf voltage comprises controlling the motor drive system to enter a safety pulse off mode if the back emf voltage is less than a preset voltage threshold. Optionally, the controlling the motor drive system to enter a safe mode in accordance with the back emf voltage further comprises, in the event that the back emf voltage is greater than or equal to the preset voltage threshold, If the state of the motor driving system is the state without high voltage, controlling the motor driving system to enter an active short circuit mode, or And if the state of the motor driving system is the high-voltage pre-charging state, acquiring the high-voltage bus voltage of the vehicle, and controlling the motor driving system to enter a safety mode according to the counter electromotive force voltage and the high-voltage bus voltage. Optionally, controlling the motor drive system to enter a safe mode according to the back emf voltage and the high-voltage bus voltage includes: Controlling the motor driving system to enter an active short circuit mode under the condition that the back electromotive force voltage is greater than or equal to the high-voltage bus voltage, or And under the condition that the back electromotive force voltage is smaller than the high-voltage bus voltage, controlling the motor driving system to enter a safety pulse turn-off mode. Optionally, in the case that the motor driving system state is the high-voltage standby state, before controlling the motor driving system to enter a safety mode according to the motor rotation speed, the method further comprises acquiring a high-voltage bus voltage of the vehicle; The control of the motor driving system to enter a safety mode according to the motor rotating speed comprises the steps of obtaining a back electromotive force voltage according to the motor rotating speed, controlling the motor driving system to enter an active short circuit mode under the condition that the back electromotive force voltage is larger than or equal to the high-voltage bus voltage, or controlling the motor driving system to enter a safety pulse turn-off mode under the condition that the back electromotive force voltage is smaller than the high-voltage bus voltage. Optionally, before the acquiring the motor drive system state of the vehicle, the method further comprises determining whether the motor drive system of the vehicle is in a fault state; the acquiring the motor drive system state of the vehicle includes acquiring the motor drive system state of the vehicle with the motor drive system in a non-failure state. In a second aspect, the present disclosure provides an apparatus for motor control, the apparatus comprising: The