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. 21, 2017
Filed:
Jan. 25, 2012
Yuji Yasui, Saitama, JP;
Eiji Hashimoto, Saitama, JP;
Hideki Matsunaga, Saitama, JP;
Hisao Haga, Saitama, JP;
Masafumi Sakota, Saitama, JP;
Yuji Yasui, Saitama, JP;
Eiji Hashimoto, Saitama, JP;
Hideki Matsunaga, Saitama, JP;
Hisao Haga, 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 maintain the NOx purification rate of a selective reduction catalyst at near the maximum thereof. The exhaust purification system is provided with an oxidation catalyst and CSF provided in the exhaust plumbing of the engine, a selective reduction catalyst that is provided in the exhaust plumbing on the downstream side of oxidation catalyst and CSF, and selectively reduces NOx in the exhaust, and a NOsensor that detects NOin the exhaust inside of the exhaust plumbing on the downstream side of the selective reduction catalyst. An ECU executes NO-NOx ratio decrease processing to cause the NO-NOx ratio corresponding to the ratio of NOto NOx in the exhaust flowing into the selective reduction catalyst to decrease, in a case of a detection value Vnofrom the NOsensor being greater than a predetermined value Vno_th.