Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1994-09-22
1996-03-05
Bonck, Rodney H.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477159, 477906, F16H 6118, F16H 6112
Patent
active
054962315
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:
patent: 4283970 (1981-08-01), Vukovich
patent: 4313353 (1982-02-01), Honig
patent: 4981052 (1991-01-01), Gierer
patent: 5086672 (1992-02-01), Kato et al.
Bonck Rodney H.
Estremsky Sherry
General Motors Corporation
Scherer Donald F.
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