| 摘要 |
PROBLEM TO BE SOLVED: To enable ordinary running without changing a running speed abruptly for an abnormality of a rear wheel steering angle control signal system. SOLUTION: When a vehicle operates normally, a steering angle ratio is determined based on a detected vehicle speed and so-called 4WS control is performed by a rear wheel steering angle determining part 81 and a rear wheel steering mechanism part 82. An abnormality of this control is detected by a monitoring part 83. If the monitoring part 83 detects an abnormality, it is displayed that an output condition of the rear wheel steering mechanism part 82 is not within a predetermined allowance scope including a neutral state by an output of a neutral position detection part 84, even if power supply causes a defect, and the display is released when the output condition of the rear wheel steering mechanism part 82 is within the predetermined allowance scope. |
