Automatic transmission control apparatus

Details Automatic transmission control apparatus Automatic transmission control apparatus

1996-05-08

1998-05-12

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

477117, F16H 6100

Patent

active

057498024

ABSTRACT:
An automatic transmission control apparatus has first and second hydraulic servos for engaging forward and reverse driving friction engaging elements, respectively, a fluid pressure control unit, a range shift detector, and an electronic control unit. When the forward driving range is selected, the fluid pressure control unit supplies a forward driving range pressure to the hydraulic servo via a changeover valve operated by a signal pressure from a normal open-type solenoid valve, when the signal pressure is drained. When the reverse driving range is selected, the electronic control unit outputs a signal to magnetize the solenoid valve. The solenoid valve is thus turned on to discontinue the drain. The control apparatus thus prevents low pressure in the reverse driving range pressure to prevent delay of engagement of the clutch.

REFERENCES:
patent: 4850251 (1989-07-01), Kuwayama et al.
patent: 5005444 (1991-04-01), Kimura et al.
patent: 5088357 (1992-02-01), Kamada et al.
patent: 5329830 (1994-07-01), Kitagawa et al.
patent: 5334114 (1994-08-01), Ando et al.
patent: 5337625 (1994-08-01), Jang
patent: 5351577 (1994-10-01), Ando et al.
patent: 5367922 (1994-11-01), Jan
patent: 5445578 (1995-08-01), Koenig et al.

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