Patent ID: 6640173
Filing Date: 2003-10-28
Classification: B60T,B62D

Abstract:
A method of controlling a vehicle having a steer-by-wire system with enhanced yaw stability during a yaw motion disturbance, the method comprising:sensing a steering wheel angle, speed, and yaw rate of the vehicle; generating a steering angle signal of the steer-by-wire system, the steering angle signal being indicative of a steering angle based on steering wheel angle and steering ratio; generating an extra road wheel angle signal implementing a gain schedule proportional-integral control strategy and an instant proportional-integral control strategy, the extral road wheel angle signal being indicative of an extra road wheel angle to compensate for the yaw motion disturbance defining a time zero; generating a road wheel angle signal indicative of a road wheel angle, the road wheel angle being based on the extra road wheel angle and the steering wheel angle before a predetermined time lapse, the road wheel angle being based on the steering wheel angle after the predetermined time lapse relative to a time zero; and applying torque to the road wheels to move the road wheels based on the road wheel angle.