Air-fuel ratio control apparatus of internal combustion...

Details Air-fuel ratio control apparatus of internal combustion... Air-fuel ratio control apparatus of internal combustion...

2011-01-25

2011-01-25

Denion, Thomas E (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S274000, C060S276000, C060S299000

Reexamination Certificate

active

07874143

ABSTRACT:
An air-fuel ratio control apparatus and control method thereof performs air-fuel ratio feedback control based on an estimated value (i.e., an upstream side estimated air-fuel ratio) of an air-fuel ratio of gas discharged from a combustion chamber into an exhaust passage and an output value of an air-fuel ratio sensor downstream of a catalyst. This upstream side estimated air-fuel ratio is accurately estimated based on an operating state of the engine and a combustion state (i.e., the degree of misfire in the combustion chamber) of the engine.

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Aug. 12, 2010 German Office Action issued in German Patent Application No. 10 2006 035 356.0 with English translation.
Aug. 5, 2008 Japanese Office Action issued in Japanese Patent Application No. 2005-303887 with English translation.

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