Hydraulic control device for automatic transmission

Details Hydraulic control device for automatic transmission Hydraulic control device for automatic transmission

2006-09-12

2006-09-12

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

Reexamination Certificate

active

07104911

ABSTRACT:
A hydraulic control device for an automatic transmission comprises an engagement element pressure control section for controlling an engagement element pressure, engagement elements supplied with the engagement element pressure, and an oil pressure switches provided in oil supply paths of the engagement element pressure. The plural gear positions are achieved by engaging or disengaging the engagement elements. The engagement element pressure control section controls the engagement element pressure with a first gain when the engagement elements are in the shifting state and controls the engagement element pressure with a second gain when the engagement elements are in the engagement state.

REFERENCES:
patent: 6537170 (2003-03-01), Murasugi et al.
patent: 6540635 (2003-04-01), Sano
patent: 6860830 (2005-03-01), Saitou et al.

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