Patent ID: 7832522
Filing Date: 2010-11-16
Classification: B62D

Abstract:
1. A vehicle steering system comprising: a steering wheel; a steering angle detector for detecting a steering angle of the steering; a steering angular speed calculator for calculating a steering angular speed of the steering; a vehicle speed detector for detecting a vehicle speed; a target rudder angle finding device for finding a target rudder angle which is based on the steering angle, the steering angular speed, and the vehicle speed; and an actuator for turning at least one wheel of the vehicle in accordance with the target rudder angle, wherein the target rudder angle is a sum of a proportional term in proportion to the steering angle and a differential term in proportion to the steering angular speed, wherein a modifying device modifies a value of the differential term smaller when the steering angular speed is negative comparing to a value of the differential term when the steering angular speed is positive, and wherein the steering angular speed is positive when the steering wheel is rotated away from a neutral position, and the steering angular speed is negative when the steering wheel is rotated toward the neutral position.