192 clutches and power-stop control – Clutches – Operators
Patent
1994-09-22
1996-02-20
Pitts, Andrea L.
192 clutches and power-stop control
Clutches
Operators
192 8718, 192109F, 192 357, 477166, F16D 2508, F16D 2510
Patent
active
054922100
ABSTRACT:
A hydraulic control for an automatically shifted power transmission has an electronically controlled governor pressure source which provides a speed and throttle sensitive pressure for controlling the shift points and trim boost in the transmission control. An inhibitor circuit is activated in the event of a discontinuance of the electrical control, resulting in maximum governor pressure, to permit selected vehicle operation in one forward ratio and a reverse ratio. Each ratio interchange is controlled by a respective shift valve and clutch control valve. Each clutch control valve has an integral trim control which is effective to control the pressure rise in the on-coming clutch without bypassing fluid to an exhaust. Also during a ratio interchange, an off-going clutch is controlled at a reduced pressure during a portion of the ratio interchange.
REFERENCES:
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patent: 4058193 (1977-11-01), Morisawa et al.
patent: 4085834 (1978-04-01), Kreitzberg
patent: 5009118 (1991-04-01), Raszkowski et al.
patent: 5115722 (1992-05-01), Ichihashi et al.
patent: 5307914 (1994-05-01), Elijah
patent: 5352161 (1994-10-01), Mowatt et al.
patent: 5399130 (1995-03-01), Long
patent: 5407042 (1995-04-01), Fukui et al.
patent: 5425688 (1995-06-01), Raszkowski
General Motors Corporation
Pitts Andrea L.
Scherer Donald F.
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