Motor control method, motor controller, system and vehicle

Abstract

The invention provides a motor control method, a motor controller, a system and a vehicle, and the method comprises the steps: obtaining first reference information of a current power-on moment and second reference information of a last power-off moment when the motor controller is detected to be switched to a power-on state; obtaining an initial integral value at the current power-on moment according to the first reference information and the second reference information; calculating a target integral value of the motor in the current power-on state according to the initial integral value; and controlling the output torque of the motor according to the target integral value. According to the embodiment of the invention, the operation state of the motor at the last power-off moment is fully considered, so that the initial integral value of the current square to the time has high accuracy, and accurate control of the motor is ensured when the motor is controlled according to the initial integral value, thereby avoiding the situation that the actual situation is not consistent with the calculation situation, and improving the reliability of the motor. Therefore, the normal operation of the motor and the vehicle can be ensured.

Description

technical field [0001] The present application relates to the technical field of motor control, and in particular, to a motor control method, a motor controller, a system, and a vehicle. Background technique [0002] A pure electric vehicle usually refers to the on-board power battery as the power source, and the motor drives the wheels to drive. The motor controller (Motor Control Unit, referred to as MCU) converts the high-voltage DC power of the battery into three-phase AC power to drive the motor output torque. [0003] When the ambient temperature is high and the vehicle runs under heavy load conditions for a long time, the motor current is large, which will cause the temperature of the motor stator to rise. If the limit is not applied, an over-temperature fault will be triggered. The square integrates the time, and when the integral value reaches a certain threshold, the motor will be derated (limited output torque) to run. [0004] However, the above scheme has short...

AI Technical Summary

Problems solved by technology

[0005] The technical purpose to be achieved by the embodiments of the present application is to provide a motor control method, a motor controller, a system, and a vehicle to solve the problem that when the current vehicle is powered on again after a relatively short interval, the integral value of the current square versus time returns to zero. Problems causing motor temperature limit to fail

Images