Patent ID: 6881165

Claim:
A hydraulic control apparatus of an automatic transmission for a vehicle comprising: a first hydraulic pump for pressure feeding a working fluid for a power steering apparatus; a second hydraulic pump for pressure feeding a working fluid for a shift transmission control of an automatic transmission; a motor for driving the first hydraulic pump and the second hydraulic pump; a power train target rotational speed determining portion which determines a target rotational speed for obtaining an amount of working fluid required in hydraulic control of the automatic transmission; a power steering target rotational speed determining portion which determines a target rotational speed for obtaining an amount of working fluid reciuired in hydraulic control of the power steering apparatus; a steering judging portion which determines whether or not a steering operation for turning the vehicle is being executed based on a steering angle and a steering angular speed of a steering wheel; a target rotational speed selecting portion which selects, as the target rotational speed, a higher value among the target rotational speed determined by the power train target rotational speed determining portion and the target rotational speed determined by the power steering target rotational speed determining portion when the steering judging portion determines that the steering operation is being executed and selects the target rotational speed determined by the power train target rotational speed determining portion as the target rotational speed when the steering portion determines that the steering operation is not being executed; and an electric motor driving portion which drives the electric motor so that the target rotational speed selected by the target rotational speed selecting portion coincides with an actual rotational speed of the first hydraulic pump and the second hydraulic pump.