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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 10302002 B1

PDFFull Text
Date of Patent:
May. 28, 2019

Filed:

Jun. 15, 2015

Deterioration diagnosis apparatus for exhaust gas purification apparatus

Applicant:

Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;

Inventors:

Koji Hagiwara, Susono, JP;

Toru Kidokoro, Hadano, JP;

Yasushi Iwazaki, Edina, JP;

Taisuke Yoshida, Susono, JP;

Assignee:

Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;

Attorney:

Finnegan, Henderson, Farabow, Garrett & Dunner, LLP

Primary Examiner:

Monzer R Chorbaji

Int. Cl.
CPC ...
A61L 9/00 (2006.01); B62D 25/10 (2006.01); G01N 33/497 (2006.01); F02B 43/08 (2006.01); B03C 3/68 (2006.01); C01G 56/00 (2006.01); F01N 11/00 (2006.01); F01N 3/08 (2006.01); F01N 3/20 (2006.01); F01N 9/00 (2006.01); F02D 41/02 (2006.01); F02D 41/14 (2006.01); F01N 13/00 (2010.01); B01D 53/94 (2006.01); F02D 41/40 (2006.01);
U.S. Cl.
CPC ...
F01N 11/007 (2013.01); B01D 53/9418 (2013.01); B01D 53/9422 (2013.01); B01D 53/9495 (2013.01); F01N 3/0814 (2013.01); F01N 3/0842 (2013.01); F01N 3/0871 (2013.01); F01N 3/0885 (2013.01); F01N 3/2066 (2013.01); F01N 3/2073 (2013.01); F01N 9/00 (2013.01); F01N 11/00 (2013.01); F01N 11/002 (2013.01); F01N 13/009 (2014.06); F02D 41/0235 (2013.01); F02D 41/0295 (2013.01); F02D 41/1441 (2013.01); F02D 41/1456 (2013.01); F01N 2550/00 (2013.01); F01N 2550/02 (2013.01); F01N 2560/025 (2013.01); F01N 2560/06 (2013.01); F01N 2570/14 (2013.01); F01N 2570/145 (2013.01); F01N 2900/1402 (2013.01); F02D 41/027 (2013.01); F02D 41/0275 (2013.01); F02D 41/405 (2013.01); F02D 2200/0816 (2013.01); Y02C 20/10 (2013.01); Y02T 10/24 (2013.01); Y02T 10/47 (2013.01);
Abstract

The present invention provides a deterioration diagnosis apparatus for an exhaust gas purification apparatus, including a first sensor that measures the oxygen concentration of the exhaust gas flowing into the exhaust gas purification apparatus, a second sensor that measures the oxygen concentration of the exhaust gas flowing out of the exhaust gas purification apparatus, and diagnosing means for diagnosing deterioration of the exhaust gas purification apparatus on the basis of a difference that appears between a measurement value of the first sensor and a measurement value of the second sensor when the air-fuel ratio of the exhaust gas flowing into the exhaust pas purification apparatus is switched from a lean air-fuel ratio to a rich air-fuel ratio, wherein, when the air-fuel ratio of the exhaust gas is switched from a lean air-fuel ratio to a rich air-fuel ratio, a water-gas shift reaction is generated upstream of the first sensor.

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