Vehicular rear-wheel steering angle control device

摘要

PURPOSE:To obtain sufficient small turning performance by memorizing a locus passed by a vehicle front end point on the basis of rear wheel antiphase steering for minimizing a turning radius, restricting the rear wheel antiphase steering quantity at need in such a way that the rear endpoint enters the inside of the locus and relieving the restriction gradually with the increase of the vehicle speed. CONSTITUTION:In an overhang quantity operating part (h), the overhang quantity of a vehicle rear endpoint B in its outer turning direction in relation to a vehicle front endpoint locus is obtained by such an operation as to enlarge its overhang degree gradually as the vehicle speed is increased. A rear wheel steering angle limit quantity operating part (i) then calculates such a rear wheel steering limit quantity that the vehicle rear endpoint B passes the specified place in the proximity of the vehicle front endpoint locus from the memorized front endpoint locus, overhang quantity and front wheel steering angle signal. In a rear wheel steering angle target value deciding part (j), the rear wheel steering angle target value is further decided on the basis of the rear wheel steering angle operated at a main rear wheel steering angle operating part (e) and the rear wheel steering angle limit quantity operated at a rear wheel steering angle limit quantity operating part (i).