Method for controlling an automatic transmission by sensing fric

Details Method for controlling an automatic transmission by sensing fric Method for controlling an automatic transmission by sensing fric

1999-08-04

2000-08-29

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

188 111W, 188 111L, F16D 6600, F16D 6602

Patent

active

061100684

ABSTRACT:
A method for controlling torque transfer between first and second friction elements in an automatic transmission having a hydraulic band brake servo in which a magnet is fixed to a displaceable piston, and a sensor producing a signal responsive to the sensed intensity of a field produced by the magnet representing the position of the servo piston, producing from the signal an indication of the position of the servo piston, determining a reference threshold servo position corresponding to incipient band brake torque capacity, and reducing pressure in the second friction element when the current servo displacement equals the threshold displacement.

REFERENCES:
patent: 4617968 (1986-10-01), Hendrixon
patent: 4962831 (1990-10-01), Dundas
patent: 5002909 (1991-03-01), Ichikawa et al.
patent: 5240041 (1993-08-01), Garnjost
patent: 5244002 (1993-09-01), Frederick
patent: 5253735 (1993-10-01), Larson et al.
patent: 5450930 (1995-09-01), Martens et al.
patent: 5722459 (1998-03-01), Kim et al.
patent: 5787915 (1998-08-01), Byers et al.
patent: 5826616 (1998-10-01), Golden

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