Olpumpensteuersystem a method thereof Hybridfahrzeugsund

The present invention relates to an oil pump control apparatus of a hybrid vehicle, which controls an oil pump according to a requirement of an output torque and an oil temperature and an associated method. An oil pump control method includes controlling the line hydraulic pressure by driving an oil pump at maximum output if a start demand is detected for a hybrid vehicle, calculating a viscosity which corresponds to an oil temperature in the engine stop mode, and controlling a rotational speed of the oil pump in a low power low power state and calculating a viscosity according to a change of a line pressure in a driving state and controlling the rotational speed of the electric pump in either a low-power, a mid-power and a high power state.