Automatic transmission control system

Details Automatic transmission control system Automatic transmission control system

1993-02-01

1995-04-25

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475123, F16H 362

Patent

active

054094275

ABSTRACT:
An automatic transmission control system couples frictional coupling element, such as a low reverse brake, so that the frictional coupling element provides different torque transmissive capacities in a reverse gear and a first gear in which engine braking is available. The system includes a pressure regulator which regulates a coupling pressure, by which the frictional coupling element is coupled and which is controlled and gradually supplied to the frictional coupling element, during a shifting of the automatic transmission to a reverse gear. The pressure regulator is disabled from regulating the coupling pressure in the reverse gear.

REFERENCES:
patent: 3885447 (1975-05-01), Braun et al.
patent: 4262557 (1981-04-01), Grob et al.
patent: 4430910 (1984-02-01), Lemieux et al.
patent: 4679450 (1987-07-01), Hayakawa et al.
patent: 4838126 (1989-06-01), Wilfinger et al.
patent: 5211082 (1993-05-01), Sasaki et al.

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