| 摘要 |
PURPOSE:To control the steering ratio in car speed sensing form when a trouble is generated, by adopting an analogue circuit equipped with a characteristic equallizer amplifier as back-up means of a control circuit for controlling a pulse motor. CONSTITUTION:A control mechanism C for controlling a rear wheel steering rod 9 is equipped with an input shaft 14 and a control rod 15, and the turning moment in steering is transmitted in to the input shaft 14 by the second rack and pinion mechanism 16 installed onto a front wheel steering rod 4. A pulse motor 21 for varying the steering ratio according to the car speed is connected with the control mechanism C, and each of revolution speed and direction of said motor 21 is controlled according to the car speed by a control circuit 23 which receives the output corresponding to the car speed detected by a car speed sensor 22. Further, with the control circuit 23, an analogue circuit 105 as back-up means which is driven in substitution for the circuit in broken state is connected. |
