STEERING DEVICE FOR VEHICLES

PURPOSE:To secure stable turning performance, by deriving the cornering power of a tire according to a detection value of a factor showing a running state, while controlling rear wheel turn-steering operations according to the said power, in a steering device which makes a turn-steering angle for rear wheels controllable. CONSTITUTION:In case of a device which operates rear wheel turn-steering information at a computer 12 in which each output signal out of a lateral acceleration sensor 13 and a front wheel turn-steering angle sensor 14, etc., is inputted, and turns and steers each rear wheel through a servo actuator 8 according to the operation result, plural numbers of cornering power C1-Cn are found according to a front actual steering angle by the said sensor 14. In addition, a portion for variations in the lateral acceleration commensurate to each power aforesaid and furthermore each of estimated lateral acceleration data alpha1-alphan is found from a portion for variations in the front wheel actual steering angle. And, among them, such estimated lateral acceleration data as being most approximate to the measured lateral acceleration data alpha0 by the said sensor 13 is selected and corresponding cornering power is derived out, controlling the rear wheel turn-steering by the control information calculated on the basis of the said power.