Control apparatus for hydraulically operated vehicular transmiss

Details Control apparatus for hydraulically operated vehicular transmiss Control apparatus for hydraulically operated vehicular transmiss

1996-01-26

1997-06-24

Wright, Dirk

192 clutches and power-stop control

Transmission control and clutch control

Interrelated

475 65, 192 358, F16H 6114, F16H 5908

Patent

active

056410433

ABSTRACT:
A control apparatus for a hydraulically operated transmission for a vehicle has a control circuit portion for a lockup clutch and a solenoid valve for controlling a clutch which is engaged in a particular drive range. In another drive range in which the clutch is not engaged, an output pressure of the solenoid valve is inputted to the control circuit portion. A changeover valve can be switched between a first position in which a first oil passage to be connected to an output side of the solenoid valve in the drive range and a second oil passage to be communicated with the control circuit portion are brought into communication with each other, and a second position in which this communication is shut off. The changeover valve is switched to the first position by a hydraulic oil pressure which is generated at the time of establishing a predetermined transmission train other than the first-speed transmission train. An input oil passage inputs the first signal pressure to urge the changeover valve to the first position in interlocking with switching of the changeover valve to the first position. The first signal pressure is maintained to a constant pressure without influence by speed changing.

REFERENCES:
patent: 4936166 (1990-06-01), Holbrook et al.
patent: 4989702 (1991-02-01), Yoshimura et al.
patent: 4996894 (1991-03-01), Holbrook et al.
patent: 4998604 (1991-03-01), Vukovich et al.
patent: 5010990 (1991-04-01), Yoshimura et al.

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