HYDRAULIC CONTROL SYSTEM FOR CONTINUOUSLY VARIABLE TRANSMISSION HYBRID ELECTRIC VEHICLE

摘要

A hydraulic control system for continuously variable transmission hybrid electric vehicle is provided to improve driving characteristics by performing a shift operation according to an input torque and an RPM(Revolution Per Minute). Pressure of a primary pulley(25) is controlled according to an RPM in order to perform a shift process according to an input torque and the RPM when a transmission control unit is in a defective state. A ratio control valve(13) is controlled by the first transmission ratio control pressure and the second transmission ratio control pressure. The ratio control valve is controlled according to the first start clutch control pressure by supplying the first start clutch control pressure through a limp-home valve(15) to an oil path of the second transmission ratio control when the transmission control unit is in the defective state. A continuously variable transmission is moved to a rising mode or a falling mode according to a state of the pressure of the ratio control valve when the RPM is in an increasing state.