| 摘要 |
PURPOSE:To operate a shift lock so quickly and surely as to improve an effect of preventing a belt from slippage in tire locking by providing a solenoid valve for draining off Pitot pressure according to an electric signal in the tire locking in a Pitot pressure oil path. CONSTITUTION:In a change gear ratio controlling valve 100 of a hydraulic control system in an continuously variable transmission, primary pressure is increased and decreased for speed change control according to the relationship between Pitot pressure corresponding to the rotational frequency of a primary pulley and a spring force corresponding to the opening of an accelerator. When tire locking takes place at the high speed side in braking a low mu path, Pitot pressure is drained forcibly by a solenoid valve 160 so that an ABS control unit 161 is operated by a brake system and a shift lock valve 84 of a shift lock mechanism 150 is surely closed even when the rotational frequency of the primary pulley is higher for example to hold the primary pressure at high one and prevent a belt from slippage in the release of the tire lock. |
