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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9188072 B1

PDFFull Text
Date of Patent:
Nov. 17, 2015

Filed:

Sep. 24, 2010

Air-fuel ratio control apparatus for an internal combustion engine

Applicants:

Makoto Tomimatsu, Susono, JP;

Takahiko Fujiwara, Susono, JP;

Inventors:

Makoto Tomimatsu, Susono, JP;

Takahiko Fujiwara, Susono, JP;

Assignee:

TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi-ken, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Stephen K Cronin

Assistant Examiner:

George Jin

Int. Cl.
CPC ...
F02D 41/14 (2006.01); F01N 3/00 (2006.01); F02D 41/02 (2006.01); F02D 17/02 (2006.01); F02D 41/00 (2006.01); F02D 41/24 (2006.01); F01N 13/00 (2010.01);
U.S. Cl.
CPC ...
F02D 41/0235 (2013.01); F01N 13/0093 (2014.06); F02D 17/02 (2013.01); F02D 41/0085 (2013.01); F02D 41/1454 (2013.01); F02D 41/1458 (2013.01); F02D 41/1463 (2013.01); F02D 41/2454 (2013.01); F01N 13/008 (2013.01); F01N 2560/025 (2013.01); F02D 41/1441 (2013.01); Y02T 10/22 (2013.01);
Abstract

An embodiment (control apparatus) of an air-fuel ratio control apparatus according to the present invention determines, based on an output value Voxs of a downstream air-fuel ratio sensordisposed at a position downstream of a three-way catalyst, which air-fuel request is occurring, a rich request or a lean request. The control apparatus sets an air-fuel ratio of each cylinder (cylinder-by-cylinder air-fuel ratio) to a rich air-fuel ratio when the rich request is occurring, and sets the cylinder-by-cylinder air-fuel ratio to a lean air-fuel ratio when the lean request is occurring. The control apparatus has a cylinder-by-cylinder air-fuel ratio of a specific cylinder different from a cylinder-by-cylinder air-fuel ratio of the other cylinder so as to obtain a fluctuation period correlated value indicative of a fluctuation of the output value Voxs of the downstream air-fuel ratio sensor, and determines an influence/impact degree on the output value of the downstream air-fuel ratio sensor of an exhaust gas discharged from each of a plurality of cylinders, based on the fluctuation period correlated value. Further, the control apparatus controls the air-fuel ratio of each cylinder in accordance with the influence degree.

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