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:
Aug. 13, 2019
Filed:
Jul. 12, 2017
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Masanobu Kanno, Hiroshima, JP;
Takayuki Yamaguchi, Hatsukaichi, JP;
Masayuki Tetsuno, Hiroshima, JP;
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Abstract
An exhaust emission control system of an engine including a NOcatalyst for storing NOwithin exhaust gas when an air-fuel ratio thereof is lean, and reducing the NOwhen the air-fuel ratio is approximately stoichiometric or rich, the NOcatalyst also functioning as an oxidation catalyst for oxidizing HC, is provided. The system includes a SCR catalyst for purifying NOby causing a reaction with NH, a urea injector, and a processor configured to execute a fuel injection controlling module, and a NOreduction controlling module for performing a NOreduction control to enrich the air-fuel ratio to a target ratio. When the urea injection is abnormal, the NOreduction controlling module performs an NH-supplied NOreduction control in which the NOcatalyst supplies NHto the SCR catalyst, by performing the NOreduction control, a lean air-fuel ratio operation control, and then the NOreduction control again.