Cold idle adaptive air-fuel ratio control utilizing lost fuel approximation
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United States of America Patent
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Sep 23, 2008
Grant Date -
Dec 6, 2007
app pub date -
May 31, 2006
filing date -
May 31, 2006
priority date (Note) -
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Abstract
A method for controlling fueling of an engine, the method comprising during an engine cold start and before the engine is warmed to a predetermined level, transitioning from open-loop fueling to closed-loop fueling, where during closed-loop fueling feedback from an exhaust gas oxygen sensor is utilized and where said closed-loop fueling generates a cycling of delivered fuel in maintaining exhaust air-fuel ratio at a desired level; and providing a fueling adjustment to a subsequent engine start in response to fueling information, said fueling information obtained over at least a complete cycle of closed-loop fueling following said transition from open-loop fueling.
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