The invention discloses a locked-rotor protection method for a motor in an electric power steering system. The locked-rotor protection method specifically comprises the steps that S1, the maximum current limiting value and the minimum protection value of output current of the motor are determined; s2, the steering torque and the steering angular speed of a steering wheel connected with the electric power steering system are detected, motor output currents are detected, if the detected steering torque is not smaller than a set torque threshold value, the steering angular speed is zero, and the motor output currents are detected to be not smaller than the maximum current limiting value within the first set time, the step S3 is executed, and otherwise, the step S5 is executed; s3, the output current of the motor is reduced according to a set current reduction strategy, whether the steering torque is smaller than a set torque threshold value or not is continuously detected, if yes, the step S5 is executed, and if not, the step S4 is executed; s4, detecting whether the output current of the motor is greater than the minimum protection value, if so, turning to S3, and otherwise, keeping the output current of the motor at the minimum protection value; and S5, determining the output current of the motor according to the current control strategy of the electric power steering system.

    本发明公开了一种电动助力转向系统中电机的堵转保护方法,具体包括:S1、确定电机输出电流的最大限流值和最低保护值;S2、检测与电动助力转向系统连接的方向盘的转向扭矩和转向角速度以及检测电机输出电流,若检测到的转向扭矩不小于设定扭矩阈值、转向角速度为零、且持续第一设定时间内检测到电机输出电流均不小于最大限流值时,转到S3,否则转到S5;S3、按设定的电流降低策略降低电机输出电流,并持续检测转向扭矩是否小于设定扭矩阈值,若是则转到S5,否则转到S4;S4、检测电机输出电流是否大于最低保护值,若是则转到S3,否则将电机输出电流保持在最低保护值;S5、按电动助力转向系统的电流控制策略确定电机输出电流。


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    Title :

    Locked-rotor protection method for motor in electric power steering system


    Additional title:

    一种电动助力转向系统中电机的堵转保护方法


    Contributors:
    WANG DEQIANG (author) / TIAN WEI (author) / JIN ZHAOYONG (author)

    Publication date :

    2023-08-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge



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