| 摘要 |
PURPOSE:To maintain continuity of control of a steering angle ratio after elimination of the occurrence of abnormality, by a method wherein, during the occurrence of abnormality of a source voltage, an electronic control device is reset, and after reset, the target steering angle ratio of a backup RAM is set to a value right before reset. CONSTITUTION:A steering angle ratio control mechanism 7 of a 4-wheel steering vehicle rotates a fan-shaped link provided with a partial gear through the working of an actuator 8, and through longitudinal movement of an output rod 22, a ratio of the steering angle to that of a rear wheel, i.e. a steering angle ratio, is controlled. An electronic control device 17 to control an actuator 8 determines a target steering ratio responding to a car speed sensor 15, and controls the actuator 8 so that a steering angle ratio is adjusted to a target value. In this case, it is decided whether a source voltage is lower than a set value, and when it is decided that the voltage is lower, the electronic control device 17 is reset, and after reset, a target steering angle ratio right before reset is stored in a backup RAM. |
