Hydraulic transmission control system and method for vehicle having automatic engine stop/restart function

摘要

There is provided a hydraulic transmission control system for a vehicle having an automatic engine stop/restart function. The hydraulic transmission control system includes a transmission having a power transmission element, an oil pump driven in synchronism with the engine to generate an oil pressure, a pressure regulator valve that regulates the oil pressure and supplies the regulated oil pressure to the power transmission element so as to allow power transmission through the power transmission element, and a control unit that operates the pressure regulator valve to control the oil pressure supplied to the power transmission element to a higher value when the vehicle is shifted from an automatic engine stop state to an automatic engine restart state, than that when the vehicle is in a normal driving state.