A study on the improvement of the tire force distribution method for rear wheel drive electric vehicle with in-wheel motor

This paper propose the tire force distribution method for a rear wheel drive electric vehicle. This method is developed to improve the vehicle stability under the high speed cornering condition and save the electric energy. To control the lateral vehicle motion, the desired yaw moment is calculated by yaw rate control using PID theory. And Total desired longitudinal force is also determined by acceleration pedal signal. The tire force distribution method calculates the desired longitudinal tire forces at left and right wheel using the desired yaw moment and total desired longitudinal force and Maximum longitudinal tire force. And Maximum longitudinal tire force is determined by tire friction circle theory. The proposed method is verified by the simulation using CarSim software. And it is found from simulation results that the proposed method provides improvement vehicle stability and saving the electric energy under the high speed cornering condition.