Method and apparatus for controlling liquid fuel delivery during transition between modes in a multimode engine
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United States of America Patent
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Mar 29, 2011
Grant Date -
Dec 30, 2010
app pub date -
Jun 30, 2009
filing date -
Jun 30, 2009
priority date (Note) -
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Abstract
A method of transitioning between operating modes in a multimode engine including a diesel-only mode and a diesel pilot, gas mode includes first terminating or initiating the supply of a gaseous fuel, depending on whether the system is transitioning to or from the pilot mode, and thereafter decreasing or increasing the diesel fuel supply quantity. Liquid fuel supply quantity is preferably altered in steps rather than discretely in order to avoid exceeding the lean limit of gas lambda. The number of steps and the percentage decrease or increase in each step preferably varies based at least in part on prevailing speed and load conditions.
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