Hydraulic control device for automatic transmission for vehicle adapted to engage clutch at different speed according to engine output power

摘要

For an automatic transmission for a vehicle such as an automobile having a speed stage shifting mechanism including parallelly arranged first and second hydraulically operated input clutches and adapted to provide the 3rd speed stage in which the first and second input clutches C₁ and C₂ are both engaged ahd the overdrive 4th stage in which the clutch C₁ is disengaged and the clutch C₂ is engaged, the engagement of the clutch C₁ in the 3rd speed stage being not essential unless engine brake availability is required, a hydraulic control device has a switching over valve 330 for switching over supply of a hydraulic pressure to the first clutch C₁ between a first mode of relatively quickly supplying the hydraulic pressure to the first clutch C₁ and a second mode of relatively slowing supplying the hydraulic pressure to the first clutch C₁ according to engine output power so as to select the first mode when engine output power is higher than a determinate power level as in the kickdown and to select the second mode when engine output power is less than the determinate power level as in the overdrive inhibition.