Shift control device for automatic transmission
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United States of America Patent
Stats
-
May 11, 1999
Grant Date -
N/A
app pub date -
Dec 22, 1997
filing date -
Jan 30, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an automatic transmission including a gear unit with a second brake connected in series with a one-way clutch and a first brake that is not connected with a one-way clutch, the second brake and the first brake are controlled by linear solenoid valves individually. A vehicle load is detected, and when the vehicle is in a high load state, at first the second brake performs an engagement control, then after input rotation to the gear unit is synchronized with output rotation of the gear unit, the first brake performs an engagement control. When the vehicle is in a low load state, at first the first brake performs an engagement control, then after input rotation to the gear unit is synchronized with output rotation of the gear unit, the second brake performs an engagement control.
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