Vehicle and engine control system and method
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United States of America Patent
Stats
-
Jun 22, 2004
Grant Date -
Jul 19, 2001
app pub date -
Feb 22, 2001
filing date -
Oct 12, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An engine control system controls engine torque to transition through the transmission lash zone. The transmission lash zone is determined using speed ratio across the torque converter. When near the transmission lash zone, engine torque is adjusted at a predetermined rate until the system passes through the transmission lash zone. By limiting the change of torque in this way, driveability is improved and it is possible to quickly and reliably provide negative engine torque for braking.
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