| 摘要 |
PURPOSE:To make it possible to secure the safety of a vehicle during its running in a four wheel steering vehicle by controlling a steering angle ratio to vehicle speed to prevent the rear part of a body from coming into contact with side wells on both the sides of a passage when the vehicle is turned in a narrow passage. CONSTITUTION:A control lever 30 of a steering angle ratio control mechanism A is provided with an arc-shaped groove 29 centering around a pin 27a, and a connecting pin 28 is slidably engaged along the groove 29. The end part of an output link 27 is integrally formed with a partial gear 22, and a gear 17 meshing the partial gear 22 is driven by a steering angle ratio control motor 18. A steering angle ratio setting means determines the steering angle ratio corresponding to vehicle speed, and a steering angle ratio control means drives the steering angle ratio control motor 18 on the determined steering angle ratio. A limit steering angle ratio is computed on a space between a body and side walls on a passage and a yaw angle. |
