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:
Jun. 25, 2019
Filed:
Jul. 14, 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 is provided including a NOcatalyst for oxidizing HC and storing NOwithin exhaust gas when an air-fuel ratio of the exhaust gas is lean, and reducing the NOwhen the air-fuel ratio is approximately stoichiometric or rich. The system includes a SCR catalyst for purifying NOby causing a reaction with NH, a urea injector, a fuel injection controlling module, and a processor configured to execute a NOreduction controlling module for performing a NOreduction control to enrich the air-fuel ratio to reach a target ratio. When the urea injection is determined to be abnormal, the NOreduction controlling module performs a NH-supplied NOreduction control in a state where a larger amount of unburned fuel than the amount of unburned fuel in the exhaust passage in the NOreduction control is supplied to the exhaust passage.