| 摘要 |
PURPOSE:To improve the response characteristics and ensure the operation by introducing a signal pressure proportionate to an engine output into an oil chamber to control the reengagement force of a clutch for starting and by forcibly shifting a creep prevention valve to a closed position with a hydraulic pressure proportionate to the engine output. CONSTITUTION:A spool valve body 85 is pressed to a closed position with a second throttle pressure Pt2 which is proportionate to the throttle opening. By this, a low speed stage clutch C1 is also controlled with an analog value proportionate to the throttle opening, and so, a shock at the time of a reengagement of the low speed stage clutch C1 can be reduced and the start response characteristics can be improved. As the second throttle pressure Pt2 is generally low in the rate of increase relative to the throttle opening, the pressure bearing area of a first pressure bearing surface 85a that presses the spool valve body 85 to the closed position is made larger than that of a second bearing surface 85b that presses to the opening side. Further, a creep prevention valve Vc is forcibly shifted to the closed position by a hydraulic force. |
