Reverse shift control device on automatic transmission
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United States of America Patent
Stats
-
Jul 24, 1990
Grant Date -
N/A
app pub date -
Mar 1, 1988
filing date -
Jul 1, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reverse shift control device of an automatic transmission prevents reverse running of the automatic transmission, even though a manual shift lever is set to a reverse range, when the vehicle runs at more than a predetermined speed. Certain shift valves have ports to which line pressure is applied from the manual valve when set to reverse, and also have ports which communicate with a hydraulic servo of a frictional engaging component which is engaged when the vehicle travels in reverse. When the manual valve is set to reverse and the vehicle speed is more than a predetermined speed (for example, 7 km/h), respective pairs of the ports are disconnected due to the shifting of the shift valves based on the signal issued by a controller.
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