Apparatus for and method of controlling air-fuel ratio of engine
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United States of America Patent
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May 19, 2009
Grant Date -
Sep 27, 2007
app pub date -
Mar 21, 2007
filing date -
Mar 22, 2006
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Abstract
A technique of controlling an air-fuel ration for an engine, in which an air-fuel ratio feedback correction coefficient α to correct an amount of fuel injection into the engine is computed based on an output from an air-fuel ratio sensor disposed on an upstream side of a catalytic converter. A gain of the air-fuel ratio feedback correction coefficient α in respect to a detection result of the air-fuel ratio sensor is decreased as a delay in a transient response of the air-fuel ratio sensor occurs. Thus, an excessive increase in the amount of fuel injection immediately after fuel cuts is prevented.
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