Hydraulic control system of four-speed automatic transmission fo

Details Hydraulic control system of four-speed automatic transmission fo Hydraulic control system of four-speed automatic transmission fo

1994-12-15

1996-07-30

Bonck, Rodney H.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477155, F16H 6106, F16H 6108

Patent

active

055406343

ABSTRACT:
A hydraulic control system of a four-speed automatic transmission whereby second-to-fourth skip shifting or fourth-to-second skip shifting is possible. Line pressure is controlled variably to improve the power train efficiency and the response of shifting time during gear shifting. The exhaust port of the pressure control valve, which is controlled by the line pressure varying solenoid valve according to a duty ratio, is selectively opened to control line pressure. First and second pressure control solenoid valves are controlled according to a duty ratio such that the shift valves are controlled by drive pressure and speed line pressure.

REFERENCES:
patent: 3750495 (1973-08-01), Ho et al.
patent: 4558612 (1985-12-01), Shimizu et al.
patent: 4949597 (1990-08-01), Ueki et al.
patent: 5020393 (1991-06-01), Kuwayama et al.
patent: 5090271 (1992-02-01), Hayasaki
patent: 5159856 (1992-11-01), Yoshimura et al.
patent: 5367922 (1994-11-01), Jan

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