| 摘要 |
PURPOSE:To prevent the lateral slip of wheels by increasing the grip force of a car in the lateral direction for the road surface by correcting a prescribed steering ratio characteristic of a steering-ratio varying means in the direction of equal phase by a correcting means in low-mu-road traveling. CONSTITUTION:A pulse motor 14 and a motor 24 for driving a hydraulic pump 23 are operation-controlled by the control signal outputted from a controller 25 as the control part of a rear-wheel steering mechanism. Into the controller 25, each output signal of a steering angle sensor 26, car speed sensor 27, and a road-surface friction coefficient sensor 28 is input. Inside the controller, a characteristic selecting part which receives the road-surface friction coefficient signal supplied from the road-surface friction coefficient sensor 28 is provided. When the road-surface friction coefficient signal value is over a set value, the characteristic selecting part selects the steering ratio characteristic A for ordinary traveling, and when said signal value is less than the set value, the steering ratio characteristic B for low-mu-road traveling is selected. |
