Patent ID: 8439179

Claim:
A hydraulic control device for a hybrid transmission, comprising an oil pump and a main oil line connected therewith, said main oil line is connected to a cooling and lubrication oil line, a clutch control oil line and a solenoid control oil line respectively, the main oil line is connected to the cooling and lubrication oil line through an oil orifice on an unloading valve, the cooling and lubrication oil line at the same time is connected to a valve spool control oil port of the unloading valve, while an oil outlet of the unloading valve is connected to an oil inlet of an overflow valve and the clutch control oil line respectively, an oil outlet of the overflow valve is connected to the cooling and lubrication oil line, a cooler is provided on the cooling and lubrication oil line, the clutch control oil line is connected to oil inlets of first and second proportional pressure reducing valves respectively, a pressure reducing valve is provided between the solenoid control oil line and the main oil line, the solenoid control oil line is connected respectively to valve spool control oil ports of the first and second proportional pressure reducing valves through an oil orifice, and the solenoid control oil line is also connected to a switch solenoid and a parking lock hydraulic oil cylinder through the oil orifice respectively.