Mazda Motor Corporation

Takashi Tanaka

Masayuki Tetsuno

Masanobu Kanno

Takayuki Yamaguchi

Yoshiaki Tomita

Daishi Ikeda

Hiroshi Hayashibara

Kota Matsue

Kaoru Yamada

Kazunori Hirasawa

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.

Exhaust emission control system of engine

Growing community of inventors

Higashihiroshima, Japan

Takashi Tanaka