Patent ID: 7815545

Claim:
A hydraulic control apparatus for an automatic transmission of a vehicle, the control apparatus comprising: an oil pump driven by an engine; a forward clutch arranged to be changed over from a disengagement state to an engagement state by an engagement pressure from the oil pump at a start of the engine; an idling stop control section configured to stop the engine at a stop of the vehicle when a predetermined condition is satisfied, and to restart the engine when the predetermined condition is not satisfied; a hydraulic pressure sensing section configured to sense a hydraulic pressure in the automatic transmission; a filling start judging section configured to judge a start of filling to the forward clutch in accordance with the sensed hydraulic pressure; an oil temperature sensing section configured to sense an oil temperature in the automatic transmission; and an engagement pressure control section configured to control the engagement pressure to output a filling pressure command value until an end of a piston stroke of the forward clutch in a filling phase, and then to hold clutch plates in a slip state after the end of the piston stroke of the forward clutch in an engagement phase when the forward clutch is changed over from the disengagement state to the engagement state, to shift from the filling phase to the engagement phase when a predetermined time elapses from the judgment of the start of the filling to the forward clutch, and to vary the predetermined time in accordance with the sensed oil temperature.