Lock-up control for torque converter
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United States of America Patent
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-
Nov 22, 2011
Grant Date -
Dec 18, 2008
app pub date -
Jun 16, 2008
filing date -
Jun 18, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A lock-up control system including a lock-up differential pressure generator and a controller that is programmed to: when increasing a lock-up differential pressure command value with time to establish the lock-up state of the torque converter, switch a gradient of the lock-up differential pressure command value from a first gradient to a predetermined gradient larger than the first gradient when an actual slip rotation speed is decreased to a predetermined slip rotation speed value or less; and switch the gradient of the lock-up differential pressure command value from the predetermined gradient to a second gradient smaller than the predetermined gradient when the actual slip rotation speed exceeds the predetermined slip rotation speed value again after being decreased to the predetermined slip rotation speed value or less.
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