| 摘要 |
PURPOSE:To improve the steering stability when shifted to the reverse side by providing a control section correcting so that the ratio of the wheel turning angle against the steering angle of a steering wheel is increased during a reverse operation of a car than during an advance operation. CONSTITUTION:The said steering device calculates the turning angle of a turning wheel 17 based on the input signal from a steering angle detection sensor 5 and the input signal from a car speed sensor 8 in a control section 7 when a steering wheel is steered. This turning angle is compared with the actual turned angle from a turned angle sensor 6, then the opened/closed conditions of a solenoid servo valve 24 are duty-controlled in response to the turning angle deviation to control the operation of a power cylinder 18. In this case, when a reverse condition is detected by a shift position detection sensor 9, the control signal fed to the valve 24 is multiplied by K (K<1) via a gear ratio changing means 30, and the flow quantity of the pressure oil fed from an hydraulic source 19 to the power cylinder 18 is controlled to be decreased. |
