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.:
Date of Patent:
Apr. 14, 2015
Filed:
May. 30, 2012
Masao Watanabe, Susono, JP;
Shigeharu Takagi, Miyoshi, JP;
Keisuke Kishita, Nagoya, JP;
Noboru Otake, Toyota, JP;
Akira Morikawa, Nagoya, JP;
Takuto Hirose, Seto, JP;
Yasutaka Nagai, Nagakute, JP;
Masao Watanabe, Susono, JP;
Shigeharu Takagi, Miyoshi, JP;
Keisuke Kishita, Nagoya, JP;
Noboru Otake, Toyota, JP;
Akira Morikawa, Nagoya, JP;
Takuto Hirose, Seto, JP;
Yasutaka Nagai, Nagakute, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Abstract
An exhaust gas control apparatus for an internal combustion engine includes: a NOx purification catalyst arranged in an exhaust passage of the internal combustion engine; a degradation degree estimating unit estimating a degradation degree of the NOx purification catalyst; and an air-fuel ratio control unit adjusting an air-fuel ratio of exhaust gas flowing into the NOx purification catalyst, wherein, until the estimated degradation degree of the NOx purification catalyst reaches a predetermined degradation degree, the air-fuel ratio control unit adjusts the air-fuel ratio of the exhaust gas to a rich air-fuel ratio, and, when the estimated degradation degree of the NOx purification catalyst exceeds the predetermined degradation degree, the air-fuel ratio control unit changes the air-fuel ratio of the exhaust gas from the rich air-fuel ratio to a lean air-fuel ratio so that the NOx purification catalyst is regenerated.