Method and system for engine control
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United States of America Patent
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Mar 29, 2016
Grant Date -
Jul 16, 2015
app pub date -
Mar 20, 2015
filing date -
Mar 22, 2013
priority date (Note) -
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Abstract
Methods and systems are provided for extending an engine-off period of a hybrid vehicle while reducing engine cold-start emissions. During an engine pull-up to meet operator demand, the engine is held at a higher power for a longer duration to aggressively heat the exhaust catalyst. Subsequently, the engine is pulled up to a lower power and held at the lower power for shorter bursts of time to activate the exhaust catalyst.
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