Automatic transmission control system

Details Automatic transmission control system Automatic transmission control system

1993-02-01

1994-08-30

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475120, F16H 6106

Patent

active

053422538

ABSTRACT:
A hydraulic control system for controlling an automatic transmission includes a regulating valve which reduces a line pressure in accordance with a control pressure, provided in accordance with vehicle driving conditions, to provide a coupling pressure for coupling a specific one of frictional coupling elements of the automatic transmission. The regulating valve is enabled to provide the coupling pressure independently from the control pressure when a coupling pressure for another frictional coupling element higher than a specified level.

REFERENCES:
patent: 4351206 (1982-09-01), Lemieux et al.
patent: 4838126 (1989-06-01), Wilfinger et al.
patent: 5005444 (1991-04-01), Kimura et al.
patent: 5154100 (1992-10-01), Yamada et al.
patent: 5168777 (1992-12-01), Isono et al.
patent: 5195036 (1993-03-01), Kimura et al.
patent: 5239896 (1993-08-01), Otsubo et al.
patent: 5272631 (1993-12-01), Iwatsuki et al.

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