FOUR WHEEL STEERING DEVICE FOR VEHICLE

摘要

PURPOSE:To prevent a dragging phenomenon of a rear wheel so as to improve control stability by allowing a correcting means to correct the characteristics of a steering angle ratio in such a way that an inside wheel difference will be zero when the inside wheel difference takes place between a front wheel and the rear wheel. CONSTITUTION:The actuation of both a pulse motor 14 and a drive motor 24 for a hydraulic pump 25 is controlled by signals outputted from a controller 25 that is a control section of a rear wheel steering mechanism 7. A detected signal is inputted into the controller 25 from an inside wheel difference detecting means 30 which detects the inside wheel difference between a front and a rear wheel. And the locked condition of a front-rear wheel differential gear 42 effected by a locking mechanism 42c is detected by a locked condition detecting means 29, and is outputted into the controller 25. Then the inside wheel difference between the front are rear wheels is detected by the inside wheel difference means 30 based on the rate of these drive torques, and is controlled so as to be zero.