Air-fuel ratio control apparatus for internal combustion engine
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United States of America Patent
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Jan 16, 2007
Grant Date -
Jul 29, 2004
app pub date -
Jun 18, 2002
filing date -
Jun 18, 2001
priority date (Note) -
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Abstract
An air-fuel ratio control apparatus estimates, on the basis of an exhaust air-fuel ratio of exhaust gas flowing into an exhaust purifying catalyst unit disposed in an exhaust passage of an engine, an emission of at least one specific component contained in exhaust gas flowing out of the exhaust purifying catalyst unit. The air-fuel ratio control apparatus performs the estimation by use of a model, and controls the air-fuel ratio in such a manner that the estimation value reaches a target state. The model is previously determined in consideration of the mass balance of the specific component.
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