Hydraulisches Steuerungssystem eines Automatikgetriebes

摘要

Disclosed is a hydraulic control system of an automatic transmission for a vehicle, which comprises an oil pressure regulating device for regulating the oil pressure of an oil pump, a manual/automatic shifting device for selecting a shifting mode, a pressure adjustment device for adjusting the hydraulic pressure to make a smooth shifting mode, a damper clutch control device for controlling the damper clutch of a torque converter, and a pressure distribution device for distributing the hydraulic pressure among the friction elements, wherein said pressure adjustment device further comprises an N-D control valve for supplying to the friction elements a duty-controlled hydraulic pressure produced by solenoid valves from the initial hydraulic pressure in the shifting from the neutral range to the drive range, said N-D control valve being switched to make the port change to provide the drive pressure, and a backward torque control regulator valve for making the port change by the duty-controlled hydraulic pressure in the shifting from the neutral range to the backward range so as to supply the backward pressure to the backward friction element.