Shift controller using shift timing or speed ratio dependent on the change of one way clutch for automotive automatic transmission
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United States of America Patent
Stats
-
May 23, 1995
Grant Date -
N/A
app pub date -
Jan 25, 1993
filing date -
Jan 28, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automotive automatic transmission includes a one-way clutch and solenoids which, when switched in ON-OFF manner, induces a speed change of the transmission. The rotation speed ratio between input and output shafts of the transmission is obtained. When a speed change becomes necessary, a judgment is carried out as to whether the necessary speed change is of a type which needs the engaged condition of the one-way clutch or not. If the speed change needs the engaged condition of the one-way clutch, switching of the solenoids is carried out when the rotation speed ratio comes to a predetermined value, while, if the speed change does not need the engaged condition of the one-way clutch, switching of the solenoids is carried out when a predetermined time is passed from the time when the necessity of the speed change is made.
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Cited Art Landscape
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