| 摘要 |
PURPOSE:To smoothly steer a vehicle so as to improve the efficiency of running the vehicle in a low car velocity range by steering a rear wheel at a steering angle larger than the steering ratio of front and rear wheels in a range of a car velocity smaller than a designated car velocity in a range of the designated car velocity. CONSTITUTION:The front and rear wheel steering angle in a designated car velocity range having a large car velocity to some degree is made large, so that a rear wheel 2 is steered largely in that range so as to ensure the ability of making a small sharp turn. The steering ratio in a super low car velocity range immediately after starting can restrain a change of the turning radius to the handle operation and restrain an outward overhang of the rear portion of a vehicle a negligible degree. A designated car velocity range where the steering ratio is set larger is let be a range with a car velocity smaller than the car velocity of a range where the movement of the vehicle becomes dynamically active, where by the yaw are of the vehicle can be kept from changing regardless of a handle angle so as to obtain smooth steering feeling. |
