Shift control system for automatic transmission
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United States of America Patent
Stats
-
Feb 27, 1990
Grant Date -
N/A
app pub date -
Oct 31, 1988
filing date -
Oct 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic control system for an automatic transmission comprises a one-way valve arranged between a hydraulic line leading to a second speed apply chamber of a band brake and a hydraulic line leading to a fourth speed apply chamber of the band brake in such a manner as to allow fluid communication between them when a pressure dfferential takes place. The pressure differential takes place when the transmission upshifts from the first speed ratio to fourth speed ratio. Thus, during the 1-4 shift, a pressure build-up in the fourth speed apply chamber takes place in the same manner as a pressure build-up taking place in the second speed apply chamber under the control of a 1-2 accumulator valve.
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