Control method for active discharge of motor controller

Abstract

The invention relates to the technical field of motor drive control, and discloses a motor controller active discharge control method comprising the following steps: a motor controller receives a control request message based on active discharge; the motor controller enters an active discharging operation mode according to the control request message based on active discharging, active discharging is carried out by injecting high-frequency sine D-axis current into the motor, and in the active discharging process, if the bus voltage obtained within the preset time range is lower than the safety voltage, the motor controller is controlled to complete active discharging; through high-frequency sine D-axis current discharging, the problem of torque pulsation caused by motor state deviation or position sensor installation errors during discharging can be solved, the driving experience of the whole vehicle is improved, and the torque pulsation caused by the motor state deviation or the position sensor installation errors during discharging can be effectively reduced under the condition of not depending on a complex position error compensation algorithm. The cost is not increased; and the stability of the discharge process is improved.

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