Control method and apparatus for a transmission clutch system

Details Control method and apparatus for a transmission clutch system Control method and apparatus for a transmission clutch system

2006-03-22

2008-07-22

Ho, Ha D. (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C477S086000, C477S168000

Reexamination Certificate

active

07402124

ABSTRACT:
A more efficient method for maintaining the hydraulic actuation of a selectively engageable torque transmitting device in a vehicle. The method includes generating a predetermined pressure level of a hydraulic fluid such as, for example, with a pump. The pressurized hydraulic fluid is transferred through an open valve and to a selectively engageable torque transmitting device such that the selectively engageable torque transmitting device is engaged. Thereafter, the valve is closed so that the predetermined pressure level of hydraulic fluid at the selectively engageable torque transmitting device remains relatively constant. Accordingly, the selectively engageable torque transmitting device remains engaged without continuously generating additional pressure such that the fuel economy of the vehicle is improved. A corresponding apparatus is also provided.

REFERENCES:
patent: 3951465 (1976-04-01), Stage
patent: 5342246 (1994-08-01), Mori
patent: 5902344 (1999-05-01), Eike et al.
patent: 6450309 (2002-09-01), Hirai et al.
patent: 6882925 (2005-04-01), Nohara et al.

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