Hydraulic control system of an automatic transmission for reduci

Details Hydraulic control system of an automatic transmission for reduci Hydraulic control system of an automatic transmission for reduci

1995-11-07

1997-08-12

Bonck, Rodney H.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477131, B60K 4106, F16H 6100

Patent

active

056559941

ABSTRACT:
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.

REFERENCES:
patent: 4495838 (1985-01-01), Gooch
patent: 4519273 (1985-05-01), Shimizu et al.
patent: 4932273 (1990-06-01), Arisumi
patent: 5078028 (1992-01-01), Ishikawa et al.
patent: 5364317 (1994-11-01), Amemiya
patent: 5507706 (1996-04-01), Jang et al.
patent: 5537887 (1996-07-01), Jang et al.

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