The motor control unit (MCU) actively controls the motor to operate according to the set control mode (speed / torque) and control state (drive / generation). In electric vehicles, the MCU converts the electrical energy stored in the traction battery into the energy required by the drive motor based on commands from the vehicle control unit (VCU) or by directly acquiring gear, accelerator and brake commands, thereby realizing vehicle start, forward, reverse, roll-away prevention and energy recovery. The MCU is one of the key components of electric vehicles.