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:
Oct. 15, 2019
Filed:
Jul. 05, 2017
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Masanobu Kanno, Hiroshima, JP;
Masayuki Tetsuno, Hiroshima, JP;
Takayuki Yamaguchi, Hatsukaichi, JP;
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Abstract
An exhaust emission control system of an engine, including an NOcatalyst disposed in an exhaust passage for storing NOwithin exhaust gas when an air-fuel ratio of the exhaust gas is lean, and reducing the stored NOwhen the air-fuel ratio is approximately stoichiometric or rich, is provided. The system includes an SCR catalyst disposed in the exhaust passage downstream of the NOcatalyst and for purifying NOwithin exhaust gas by causing a reaction with ammonia, a controller executing a NOreduction controlling module for executing a control in which the air-fuel ratio is controlled to a target air-fuel ratio so that the stored NOis reduced, and an ammonia adsorption amount acquiring module for acquiring an ammonia adsorption amount of the SCR catalyst by detection or estimation. The NOreduction controlling module controls the target air-fuel ratio to be leaner as the ammonia adsorption amount increases.