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:
Jun. 30, 2017
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Masonobu Kanno, Hiroshima, JP;
Hiroyuki Nishimura, Higashihiroshima, JP;
Kenji Tanimura, Hiroshima, JP;
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Abstract
An exhaust emission control system of an engine is provided, which includes a 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. A processor executes a NOreduction controlling module for performing a NOreduction control in which a fuel injector performs a post injection to control the air-fuel ratio to a target ratio, and an EGR controlling module for controlling an EGR valve to recirculate EGR gas. In the NOreduction control, the EGR controlling module controls an opening of the EGR valve to a target opening smaller than when the NOreduction control is not performed. The NOreduction controlling module starts the control after the EGR valve opening is controlled to the target opening.