| 摘要 |
PURPOSE:To prevent abnormal steering of rear wheels by detecting misestablish ment of steering ratio early depending on the output from rear wheel steering ratio detecting sensor, and by distinguishing whether the steering ratio is in the abnormal region which is established as required by the speed of vehicle. CONSTITUTION:When the rear wheel steering ratio is variably controlled abnormally, and the real rotated angle of the control shaft is in the abnormal region depending on the output signal from the steering ratio detecting sensor 31 and the car speed detecting sensor 30, the abnormality distinguishing measures 39 distinguished that the aforesaid rotated angle exists in the abnormal region. Then, owing to the output signal from the OR circuit of 48 of the abnormality distinguishing measures 39, the warning device 49 operates and a warning is issued, and the drive motor 29 of the rear wheel steering mechanism converts into the two wheel steering state. |
