METHOD OF CONTROLLING ELECTRIC OIL PUMP IN HYBRID VEHICLE

PROBLEM TO BE SOLVED: To provide a method of controlling an electric oil pump in a hybrid vehicle, configured so that the number of revolutions of the electric oil pump is not unnecessarily increased at an ultra-low temperature.SOLUTION: A method of controlling an electric oil pump in a hydraulic vehicle includes: an oil temperature measurement step of measuring an oil temperature of a transmission; an ultra-low temperature determination step of determining whether the oil temperature of the transmission is an ultra-low temperature condition that does not exceed a predetermined reference temperature; a first open loop control step of controlling the electric oil pump in an open loop up to a target number of revolutions when the ultra-low temperature determination step results in the ultra-low temperature; and a closed loop control step of controlling the electric oil pump in a closed loop in order to hold the target number of revolutions when the first open loop control step is ended. The predetermined reference temperature in the ultra-low temperature determination step is in a range of ≤-10°C, in consideration of an effect that a change in a viscosity of oil in the transmission takes on a formation of oil pressure in response to the driving of the electric oil pump.