| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the operating responsiveness of a hydraulic actuator such as a hydraulic clutch or the like. SOLUTION: A hydraulic pump 35 and a pair of hydraulic clutches 3L and 3R are connected to each other via a regulator 41, a linear solenoid valve 42 and a pair of three-way valves 44L and 44R, and opening of this linear solenoid valve 42 and opening or closing of these paired three-way valves 44L and 44R are all controlled by an electronic control unit U. In a moment when these three-way valves 44L and 44R are opened to engage the hydraulic clutches 3L and 3R, the opening of the linear solenoid valve 42 is made larger than the ordinary opening as long as the specified time, hydraulic pressure to be transmitted to the hydraulic clutches 3L and 3R by way of the three-way valves 44L and 44R is increased. With this constitution, a hydraulic fluid is quickly filled up in an oil passage connecting the linear solenoid valve 42 and the paired hydraulic clutches 3L and 3R, and thus the extent of engaging responsiveness of the hydraulic clutches 3L and 3R are improvable.</p> |
