Stabilization of Vehicle Dynamics by Tire Digital Control: Tire disturbance control algorithm for electric motor drive system-Presented at the EVS31 on October 3rd, 2018

摘要

We propose an algorithm with disturbance control for tires on electric vehicles (EV) so as to improve the steering stability of the vehicle. The effect was validated on the EV equipped with twin independent electric motors on a skid pad. The electric motors with the disturbance controller can apply micro-oscillation of drive or braking force on tires in order to suppress the abrupt slip and micro vibration generated between tire and road surface, especially on low friction surface at critical speed of the vehicle. The effective frequency was corresponded to tire scale length. The effect was verified from the fact that the hysteresis loop on a steer angle and yaw rate chart showed smaller than those without control. The hysteresis loop with control is also appeared at over steering area, which can be interpreted as evidence that the algorithm can make the vehicle more stable and gain faster speed on the skid pad. It is concluded that the tire digital control works well without any information from sensors on the vehicle body and any cooperative control between tires.