Air-fuel ratio control apparatus for internal combustion engine

Details Air-fuel ratio control apparatus for internal combustion engine Air-fuel ratio control apparatus for internal combustion engine

2007-08-20

2010-02-16

Nguyen, Tu M (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S276000, C060S277000, C060S286000, C060S295000, C123S19800E, C123S481000, C701S103000, C701S109000

Reexamination Certificate

active

07661264

ABSTRACT:
An air-fuel ratio control apparatus for an internal combustion engine, including fuel cut state detection means for detecting the state of fuel cut in which the feed of fuel into the internal combustion engine is stopped, and catalyst deterioration decision means for deciding the deterioration of a catalyst on the basis of a period which is expended since the detection of the release of the state of the fuel cut by the fuel cut state detection means, until the output value of a second air-fuel ratio sensor agrees with a predetermined reset decision value near a target value, and the manipulation quantity of an average air-fuel ratio on the upstream side of the catalyst as is based on second air-fuel ratio feedback control means. Thus, the deterioration of the catalyst can be decided at a high precision.

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