Method of controlling an electric oil pump of a hybrid car

This invention relates to a method of controlling a mechanical oil pump and the electric oil pump which in a hybrid vehicle, motor-driven oil pump only enough to compensate for the difference between the transmission required oil pressure and the output oil pressure of the mechanical oil pump equipped with an automatic transmission having a. Motor-driven oil pump control method of the invention, when the information of the engine torque and the motor torque and the oil temperature, type and comprising: a first step of calculating the transmission required oil pressure and the minimum target rotational speed, calculates a rotation speed and rotation depreciation rate for the current transmission and a third step of determining whether the second stage and the transmission required oil pressure against the current oil pressure is less than using the minimum target rotational speed and the rotational speed and rotational depreciation rate of the current transmission of the transmission, which, in the third step according to the determination result and a fourth step of determining the on / off and driving speed of the motor-driven oil pump. Hybrid cars, transmissions, electric, hydraulic requirements