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:
Mar. 29, 2016
Filed:
Dec. 16, 2011
Mayuko Osaki, Susono, JP;
Kazutoshi Akashi, Gotenba, JP;
Masao Watanabe, Susono, JP;
Shigeharu Takagi, Miyoshi, JP;
Takeshi Nobukawa, Susono, JP;
Mayuko Osaki, Susono, JP;
Kazutoshi Akashi, Gotenba, JP;
Masao Watanabe, Susono, JP;
Shigeharu Takagi, Miyoshi, JP;
Takeshi Nobukawa, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;
Abstract
Provided is an exhaust purification system for an internal combustion engine. The exhaust purification system comprising: a NOpurifying catalyst arranged in an exhaust passage of the internal combustion engine, wherein the NOpurifying catalyst comprises a base metal supported on a catalyst support; an oxygen sensor arranged at the downstream side of the NOpurifying catalyst in the exhaust passage; and an air-fuel, ratio control means for controlling the air-fuel ratio of exhaust gas flowing into the NOpurifying catalyst; wherein when the NOpurifying catalyst suffers from predetermined oxygen poisoning, the air-fuel ratio control means controls the air-fuel ratio of the exhaust gas, which flows into the NOpurifying catalyst, to a first air-fuel ratio wherein the first air-fuel ratio is richer than a theoretical air-fuel ratio, and then the air-fuel ratio control means switches the air-fuel ratio of the exhaust gas, which flows into the NOpurifying catalyst, to a second air-fuel ratio on the basis of an output value from the oxygen sensor wherein the second air-fuel ratio is leaner than the first air-fuel ratio.