Air fuel ratio control apparatus for an internal combustion...

Details Air fuel ratio control apparatus for an internal combustion... Air fuel ratio control apparatus for an internal combustion...

2005-08-23

2005-08-23

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S285000

Reexamination Certificate

active

06932069

ABSTRACT:
An air fuel ratio control apparatus for an internal combustion engine can improve learning accuracy in the air fuel ratio control even if the air fuel ratio of a mixture detected by an air fuel ratio detection device shifts from an actual air fuel ratio thereof. The apparatus controls the air fuel ratio of an exhaust gas flowing into an exhaust gas purification device based on an air fuel ratio feedback value and an air fuel ratio learning value. A temperature detection device detects the temperature of the exhaust gas purification device. A determination device determines, based on a difference between a detection value of the temperature detection device and a target temperature, that the air fuel ratio detection device shifts to a rich or lean side. The update of the air fuel ratio learning value is inhibited when the air fuel ratio detection device shifts to a rich or lean side.

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