REAR WHEEL STEERING CONTROL DEVICE FOR REAR/FRONT WHEEL STEERING CAR

PURPOSE:To converge a generated yaw rate in a short time by applying correction to an amount of rear wheel steering in response to a yaw rate so that it may shift to the same phase side the yaw rate, namely to the side where generation of the yaw rate is always restricted for front wheel steering at the time of running almost in a straight line. CONSTITUTION:When a front wheel steering angle more than a prescribed value is detected by a detecting means 4, a running speed corresponding steering angle ratio which changes from a reverse phase to the same phase is decided by a steering angle ratio deciding means 7, as a target steering angle ratio, in response to an increase in car speed detected by a detecting means 5, and a control signal is outputted to a rear wheel steering mechanism 3 by a control means 8. On the other hand, when the front wheel steering angle is less than a prescribed value, a yaw rate correction amount increasing in response to an increase in a yaw rate detected by a detecting means 6 is added to a car speed corresponding steering angle ratio, so that a correction steering angle ratio corrected to the same phase direction side is decided as a target steering angle ratio. Even if any yaw rate is generated to a car body by disturbance such as cross wind or the like at the time of running at a high speed, it can be converged at a short time by the corrective function of a handle.