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:
Nov. 23, 2010
Filed:
Dec. 22, 2006
Applicants:
Masakuni Yokoyama, Tokai, JP;
Jun Kawamura, Chita-gun, JP;
Inventors:
Masakuni Yokoyama, Tokai, JP;
Jun Kawamura, Chita-gun, JP;
Assignee:
Denso Corporation, Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01N 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An ECU controls a rich purge in the internal combustion engine by temporarily changing an air/fuel ratio of the exhaust gas into a rich range to deoxidize and remove absorbed NOx, which is absorbed by an NOx storage and reduction catalyst of an NOx catalytic converter. The ECU changes a degree of richness of the air/fuel ratio at a time of performing the rich purge based on a state of the NOx catalytic converter.