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. 04, 2014
Filed:
Apr. 04, 2012
Hideki Matsunaga, Saitama, JP;
Yuji Yasui, Saitama, JP;
Eiji Hashimoto, Saitama, JP;
Hisao Haga, Saitama, JP;
Naohiro Sato, Saitama, JP;
Masafumi Sakota, Saitama, JP;
Hideki Matsunaga, Saitama, JP;
Yuji Yasui, Saitama, JP;
Eiji Hashimoto, Saitama, JP;
Hisao Haga, Saitama, JP;
Naohiro Sato, Saitama, JP;
Masafumi Sakota, Saitama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
An exhaust purification system for an internal combustion engine is provided that can steadily maintain a NOx purification rate of a selective reduction catalyst to be high without allowing the fuel economy or marketability to deteriorate. The exhaust purification system includes a NO—NOx ratio adjustment mechanism that causes a NO—NOx ratio to change; and a NO—NOx ratio perturbation controller that executes NO—NOx ratio perturbation control so that a NObalance of the selective reduction catalyst in a predetermined time period, with NOadsorption being positive and NOrelease being negative, is 0. Herein, NO—NOx ratio perturbation control is defined as control that alternately executes NOincrease control to cause the NO—NOx ratio to be greater than a reference value near 0.5, and NOdecrease control to cause the NO—NOx ratio to be less than the reference value.