Hydraulic control device for automatic transmission

Details Hydraulic control device for automatic transmission Hydraulic control device for automatic transmission

1996-06-26

1998-01-20

Nguyen, Hoang

Motors: expansible chamber type

With motive fluid valve

Electrically operated

477126, F15B 13044, F16H 6116

Patent

active

057091404

ABSTRACT:
A hydraulic control device for an automatic transmission includes a reverse inhibit valve for inhibiting a reverse gear position to be established when the reverse range is selected by mistake. This reverse inhibit valve is placed in a selected one of a first state in which a first port communicates with a third port, and a second state in which a second port communicates with the third port, depending upon whether a solenoid pressure is applied to one end of a spool of the valve. If the reverse range is selected during forward running of a vehicle, the reverse inhibit valve is placed in the first state in which the first port communicates with the third port, so that an oil pressure of a friction element is drained through the first port.

REFERENCES:
patent: 4984486 (1991-01-01), Takana et al.
patent: 5010787 (1991-04-01), Takada et al.
patent: 5074168 (1991-12-01), Ishikawa et al.

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