Drive unit for automatic transmission

Details Drive unit for automatic transmission Drive unit for automatic transmission

2007-06-19

2007-06-19

Estremsky, Sherry (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

Reexamination Certificate

active

11130208

ABSTRACT:
A drive unit for an automatic transmission has a hydraulic circuit changing device for changing a hydraulic circuit so that one of the hydraulic control portions (hydraulic gear change portions) is selectively communicated with an oil pressure source, a position detecting device for continuously detecting a position of one of moving members of the hydraulic circuit changing device and for outputting a detection signal corresponding to the position of the moving member, and a pressure regulating device provided between the hydraulic circuit changing device and the hydraulic control portions for regulating a control pressure to be applied to the hydraulic control portions. In the above drive unit, an electronic control unit calculates a rate of changes in the detection signals from the position detecting device and controls the pressure regulating device in accordance with the rate of the changes in the detection signals.

REFERENCES:
patent: 5167311 (1992-12-01), Satoh et al.
patent: 5257188 (1993-10-01), Sakakibara et al.
patent: 5894758 (1999-04-01), Walker
patent: 6209408 (2001-04-01), DeJonge et al.
patent: 6564662 (2003-05-01), Yamamoto et al.
patent: 7-301309 (1995-11-01), None

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