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. 04, 2019
Filed:
Jul. 07, 2017
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Takayuki Yamaguchi, Hatsukaichi, JP;
Takashi Tanaka, Higashihiroshima, JP;
Kota Matsue, Higashihiroshima, JP;
Hiroshi Hayashibara, Hiroshima, JP;
Yoshiaki Tomita, Hiroshima, JP;
Kaoru Yamada, Hiroshima, JP;
Masayuki Tetsuno, Hiroshima, JP;
Daishi Ikeda, Hatsukaichi, JP;
Kazunori Hirasawa, Aki-gun, JP;
Masanobu Kanno, 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, when the NOstored amount exceeds a given amount, a NOreduction control in which a fuel injector performs a post injection of fuel to continuously control the air-fuel ratio to a target ratio so that the stored NOis reduced to be below a given amount, the target air-fuel ratio being a ratio at which the stored NOis reducible, the post injection causing the injected fuel to combust inside a cylinder, the execution of the control permitted when an engine load is within a medium load range.