Patent ID: 6415212
Filing Date: 2002-07-02
Classification: B60T,B62D

Abstract:
A steering device for a vehicle comprising:an operating member; a steering actuator driven by operation of the operating member; means for transmitting the movement of the steering actuator to the vehicle wheels, in such a manner that a steering angle changes in accordance with the movement of the steering actuator, without the operating member being coupled mechanically to the vehicle wheels; means for detecting an amount of operation of the operating member; means for detecting a vehicle speed; means for detecting a lateral acceleration of the vehicle; means for detecting a yaw rate of the vehicle; means for calculating a first steering angle set value corresponding to the detected amount of operation and vehicle speed, on the basis of a stored relationship between the amount of operation, the vehicle speed, and the first steering angle set value; means for calculating a first target yaw rate corresponding to the calculated first steering angle set value and the detected vehicle speed, on the basis of a stored relationship between the first steering angle set value, the vehicle speed, and the first target yaw rate; means for calculating a second target yaw rate corresponding to the detected lateral acceleration and vehicle speed, on the basis of a stored relationship between the lateral acceleration, the vehicle speed, and the second target yaw rate; means for comparing an absolute value of the calculated first target yaw rate with an absolute value of the second target yaw rate; means for calculating a second steering angle set value corresponding to a difference between the detected yaw rate and the first target yaw rate or the second target yaw rate whichever has a smaller absolute value, on the basis of a stored relationship between the difference and the second steering angle set value; and means for controlling said steering actuator in such a manner that said steering angle corresponds to a target steering angle, that is a sum of the calculated first steering angle set value and second steering angle set value.