Control system for automatic transmission

Details Control system for automatic transmission Control system for automatic transmission

1999-03-16

2000-08-15

Estremsky, Sherry L.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475120, 475127, F16H 6106

Patent

active

061028258

ABSTRACT:
A rotational direction of a rotational element at a high speed gear stage is different from a operational direction of a reaction torque at a low speed gear stage. The rotation by the reaction torque at the low speed gear stage is stopped with a self-energizing operation of a band brake operated by a hydraulic servo. A waiting pressure, which is lower for a predetermined amount than a engagement pressure at the self-energizing operation, and with which a basis of a racing amount occurs after a synchronizing point, is applied to the hydraulic servo until the synchronization is determined. The waiting pressure increases to the engagement pressure after determining the synchronization so that the rotational element is stopped gradually as preventing a long shift time.

REFERENCES:
patent: 4446759 (1984-05-01), McCrary
patent: 4790418 (1988-12-01), Brown et al.
patent: 5020393 (1991-06-01), Kuwayama et al.
patent: 5634869 (1997-06-01), Mikami et al.
patent: 5836852 (1998-11-01), Tsutsui et al.
patent: 5935041 (1999-08-01), Tsukamoto et al.

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