Abstract: This application provides a motor control unit and powertrain having an automatic parking assist control function for an electric vehicle, and an automatic parking assist control method for an electric vehicle. In a parking process of the electric vehicle, the motor control unit is configured to control the motor to drive the electric vehicle to travel by a preset distance. In a process in which the motor control unit controls the motor to drive the electric vehicle to travel by the preset distance, the motor control unit controls the torque output by the motor to change with a traveling distance of the electric vehicle. According to the powertrain, the motor control unit, and the control method provided in this application, a speed and accuracy of control of the automatic parking assist process can be improved.

Abstract: A motor control unit includes a three-phase full-bridge three-level inverter circuit and a control apparatus. The three-phase full-bridge three-level inverter circuit includes a vertical bridge circuit and a horizontal bridge circuit. A current capacity of a switching transistor in the vertical bridge circuit is greater than or equal to a maximum current of a motor. A current capacity of a switching transistor in the horizontal bridge circuit is less than the current capacity of the switching transistor in the vertical bridge circuit. The control apparatus is configured to control the switching transistor in the horizontal bridge circuit based on torque of the motor, a current output by an output terminal of the vertical bridge circuit, a temperature of the switching transistor in the horizontal bridge circuit, and a terminal voltage of the switching transistor in the horizontal bridge circuit.