| 摘要 |
Providing a hydraulic control apparatus for a vehicular automatic transmission, which makes it possible to design an oil pump with a reduced delivery capacity, thereby permitting an improvement of fuel economy of a vehicle. The hydraulic control apparatus includes a supply passage connecting/disconnecting valve 114A which is operated, in synchronization with a switching operation of a lock-up relay valve 114, to apply a modulator pressure PM via an orifice 118 to a lock-up clutch 18, for placing the lock-up clutch 18 in the lock-up on state, and to inhibit the application of the modulator pressure PM to the lock-up clutch 18, for placing the lock-up clutch 18 in its lock-up off state. Accordingly, the modulator pressure PM via the orifice 118 is not applied to the lock-up clutch 18 when the lock-up clutch 18 is placed in the lock-up off state, so that a total amount of flow and consumption of the working oil is reduced, making it possible to design the oil pump 20 with a reduced delivery capacity, thereby permitting an improvement of fuel economy of the vehicle.
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