The helm ratio variable feature which the helm ratio which

摘要

PROBLEM TO BE SOLVED: To establish compatibility between the out-of-assist prevention resulting from a delay in follow-up of a steering force assisting mechanism and the dislocation prevention of the maximum rotational angle of the steering wheel resulting from a difference in the steering angular velocity.;SOLUTION: A steering control device for a vehicle is equipped with a steering angle ratio changing mechanism 5 to change the steering angle ratio as the ratio of the steering angle of the front wheels 2 to the turning angle of the steering wheel 1 and the steering force assisting mechanism 6 to give a steering assist force for the steering force of the driver to a steering mechanism 3 to steer the front wheels 2, wherein the device further includes a steering angle ratio control unit 12 which enlarges the steering angle ratio in the steering angle region around the neutral point in steering irrespective of the turning angular velocity of the steering wheel 1 and lessens the steering angle ratio in the steering angle region around the rack stopper position.;COPYRIGHT: (C)2006,JPO&NCIPI