REVERSE SHIFT CONTROL APPARATUS FOR AUTOMATIC TRANSMISSIONS

WIPO Patent Application WO/1988/000304

A1

A reverse shift control apparatus for an automatic transmission mounted on an automobile, capable of preventing the automatic transmission from being put in to a backward-engaged state even when a shift lever is set in a reverse range while the vehicle runs forward at a speed not less than a predetermined level. The predetermined shift valves (11), (12) are provided with ports (Rc), (2k) to both of which a line pressure is supplied in the reverse range of a manual valve (10), as well as ports (2i), (2l) which communicate with a hydraulic servo (B3) for frictional locking elements (for example, first and reverse brakes) adapted to be engaged when the vehicle is moved backward. When the manual valve is in the reverse (R) range with a vehicle speed not less than a predetermined level (for example 7 km/h), the above-mentioned shift valves (11), (12) are switched on the basis of a signal from a control means (U) to discontinue the communication between the ports (Rc), (2j) and between the ports (2k), (2l).

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KUWAYAMA YOSHINARI (JP)
YOKOYAMA FUMITOMO (JP)
MIURA MASAKATSU (JP)

PCT/JP1987/000454

January 14, 1988

June 30, 1987

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AISIN WARNER (JP)

F16H59/44; F16H61/02; B60K20/02; F16H61/12; F16H61/16; F16H61/18; (IPC1-7): F16H5/64; F16H57/06

JPS5729290B2	1982-06-22
JPS5164155A	1976-06-03
JPS5043366A	1975-04-19
JPS487416A

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