Hydraulic control system used in automatic transmission for vehi

Details Hydraulic control system used in automatic transmission for vehi Hydraulic control system used in automatic transmission for vehi

1997-08-27

1999-11-09

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

With brake control

477114, F16H 6120

Patent

active

059804220

ABSTRACT:
The hydraulic control system includes a pressure regulating valve regulating hydraulic pressure generated by a hydraulic pump, and a pressure control valve controlling the regulated hydraulic pressure. A hydraulic pressure distributing valve set distributes the controlled regulated hydraulic pressure to a plurality of friction elements, and a shift control valve controls operation of the hydraulic pressure distributing valve set by controlling distribution of an application hydraulic pressure to the hydraulic pressure distributing valve set. A creep control unit selectively prevents the vehicle from creeping without depressing a brake pedal by supplying the application hydraulic pressure from the shift control valve to at least one of the friction elements. To this end, the creep control unit includes a creep control valve and a solenoid valve.

REFERENCES:
patent: 4513638 (1985-04-01), Nishikawa et al.
patent: 4513639 (1985-04-01), Hiramatsu
patent: 4561328 (1985-12-01), Hiramatsu
patent: 4648289 (1987-03-01), Kubo et al.
patent: 4840092 (1989-06-01), Sakaguchi et al.
patent: 4850251 (1989-07-01), Kuwayama et al.
patent: 5692990 (1997-12-01), Tsukamoto et al.
patent: 5906559 (1999-05-01), Murasugi et al.

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