| 摘要 |
<p>PURPOSE:To enable the actual controlled variable corresponding to the duty value at the time to be detected regardless of change in the actual value of a control object by determining the detection timing depending on the duty value at the time, and thereby detecting the actual value of the control object at the timing. CONSTITUTION:A switch-over valve 7 switching hydraulic pressure to be applied to a power cylinder 9 is provided with a reaction hydraulic pressure chamber 19 exerting reaction against the movement of a spool 8, and the magnitude of hydraulic pressure in the reaction hydraulic pressure chamber 14 is determined based on the quantity of hydraulic oil supplied through a variable throttle valve 23 driving solenoid drive means 29 and the quantity of hydraulic oil discharged out through a fixed throttle 31. The solenoid drive means 29 is controlled in duty by an electronic control circuit 32 based on the output from a vehicle speed sensor 33 and a lateral acceleration sensor 34. In this case, actual current energizing a solenoid 30 is detected by the timing determined based on the magnitude of a duty value at the time, electric energy turned onto the solenoid 30 is thereby controlled by means of a feedback operation.</p> |
