| 摘要 |
<p>PURPOSE:To prevent the occurrence of vehicle's behavior being inexpectable by a driver, by a method wherein a means to set a plurality of steering angle ratio modes having different steering angle ratios responding to a car speed is provided, and a steering angle ratio is switched to a value responding to a car speed according to the steering angle ratio mode selected by a mode switch. CONSTITUTION:In a steering angle ratio control mechanism A in which an input link 14 is coupled to a drop arm 8 so as to interlock with a front wheel steering mechanism 7, an output link 27 coupled to a control lever 30, pivotally mounted at 23 to a car body, by means of a pin 28 is provided. A longitudinally movable rod 31 pivotally supported at 27a to the output link 27 is coupled to the one valve element of a servo control valve 32 of a rear wheel steering mechanism 34. A gear 17 rotated with the aid of a steering angle ratio control motor 18 is engaged with a partial gear 22 on an arc of a circle formed to the output link 27. The steering angle ratio control motor 18 is controlled by an electronic control device 51 according to a steering ratio determined in response to a car speed according to one, selected by a mode switch 54, out of a plurality of steering ratio modes.</p> |
