关键词: 电动汽车, 轮毂电动机, 转向助力

Abstract: Based on the characteristics of independently drive for EV with motorized wheels, the power steering by driving force which decreases hand force of driver by controlling the driving force of the right and left steerable wheels to produce the assistance steering torque is brought out. The theory and mechanics model and the structure of power steering by driving force are presented. Including the feedforward control by the input of steering angle and vehicle velocity and feedback control by the difference of the actual hand force and the ideal hand force, the control strategy of power steering by driving force is proposed. The characteristics curve of ideal hand force is developed. The test vehicle of power steering by driving force is made. Based on the rapid prototyping technology, the test validation of the power steering by driving force and control strategy is performed on multi running conditions including fixed circle driving, double lane change and pivot steering. The test results show that the driver’s hand force on steering wheel is reduced evidently and the hand force in accordance with the ideal force is got by power steering by driving force. It provides a new method to implement the power steering technology for vehicle with motorized wheels.

Key words: Electric vehicle, In-wheel motor, Power steering