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. 21, 2009
Filed:
Feb. 12, 2004
Applicants:
Shinicihi Takeshima, Numazu, JP;
Toshiaki Tanaka, Numazu, JP;
Tetsuya Yamashita, Gotenba, JP;
Inventors:
Assignee:
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01N 3/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
In an internal combustion engine, an exhaust passage is provided with a NOstoring and decomposing catalyst (). When burning fuel under a lean air-fuel ratio, the nitrogen monoxide is adsorbed by the NOstoring and decomposing catalyst () and disassociated. At this time, the disassociated oxygen is held in the form of oxygen ions Oon the NOstoring and decomposing catalyst (). By making the air-fuel ratio rich and purging part of these oxygen ions O, the remaining oxygen ions Oare also purged. Due to this, the NOpurification performance of the NOstoring and decomposing catalyst () is restored.