Hydraulic control system for four-speed automatic transmission o

Details Hydraulic control system for four-speed automatic transmission o Hydraulic control system for four-speed automatic transmission o

1996-03-25

1997-09-23

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477130, 477154, 477131, F16H 5920

Patent

active

056698534

ABSTRACT:
In a hydraulic control system for automatic transmissions of a vehicle, drive pressure is fed to a first friction member at the first, second and third speeds of a "D" range, drive pressure is fed to a third friction member at a fourth speed, a 2-4/3-4 shift valve for exhausting pressure from the first friction member at third-to-fourth and second-to-fourth speed shifting is connected to an end clutch valve to allow pressure from a first pressure control valve to be fed to the third friction member at the fourth speed, and exhausting of pressure from a releasing conduit of a second friction member and the third friction member via an exhaust conduit connecting the 2-4/3-4 shift valve and a 2-3/4-3 shift valve during fourth-to-second, fourth-to-first and third-to-second speed shifting is delayed by an orifice.

REFERENCES:
patent: 4506563 (1985-03-01), Hiramatsu
patent: 4538482 (1985-09-01), Hiramatsu
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patent: 5269203 (1993-12-01), Ueda
patent: 5269204 (1993-12-01), Moroto et al.
patent: 5293789 (1994-03-01), Goto et al.
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patent: 5439427 (1995-08-01), Enokido et al.
patent: 5472389 (1995-12-01), Ando et al.
patent: 5501645 (1996-03-01), Taniguchi et al.
patent: 5540634 (1996-07-01), Jang et al.
patent: 5565000 (1996-10-01), Jang

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