Automatic transmission control system

Details Automatic transmission control system Automatic transmission control system

1993-04-19

1994-11-22

Koczo, Michael

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

192 85R, 192109F, B60K 4100, F16D 2514

Patent

active

053664205

ABSTRACT:
An automatic transmission has a hydraulic circuit which controls supply of engaging pressures to friction coupling elements. The hydraulic circuit has a first hydraulic passage having a hydraulic pressure control valve including an accumulator, a second hydraulic passage which is provided in parallel to the first hydraulic passage and is provided with an electrically controlled hydraulic pressure control valve, and a shift valve which selectively connects a predetermined friction coupling element to the first hydraulic passage or the second hydraulic passage.

REFERENCES:
patent: 3540558 (1970-11-01), Lamburn
patent: 3703228 (1972-11-01), Chana
patent: 4674364 (1987-06-01), Shindo et al.
patent: 4709597 (1987-12-01), Yasue et al.
patent: 5109731 (1992-05-01), Iwatsuki et al.
patent: 5211081 (1993-05-01), Bota et al.

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