EXHAUST EMISSION CONTROL DEVICE - MITSUBISHI MOTORS CORP

Title:

EXHAUST EMISSION CONTROL DEVICE

Document Type and Number:

Japanese Patent JP2014025430

Kind Code:

A

Abstract:

To provide an exhaust emission control device that suppresses reduction in an NOx purification rate of a catalyst and maintains high purification performance.

An exhaust emission control device includes: a catalyst 9 provided on an exhaust passage 15 of an engine 10 and for storing nitrogen oxides in exhaust under an oxidative atmosphere and reducing them under a reduction atmosphere; and short period control means 5 for performing short period control of periodically changing an air-fuel ratio of exhaust to a rich direction and lean direction. The device also includes recovery control means 6 for performing recovery control of extending the rich period further than in the short period control to periodically change the air-fuel ratio, when a purification rate of the nitrogen oxides in the short period control is less than a predetermined purification rate.

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Inventors:

KAWASHIMA KAZUHITO
TASHIRO KEISUKE
HASHIMOTO KENJI
KATO RYOJI

Application Number:

JP2012167015A

Publication Date:

February 06, 2014

Filing Date:

July 27, 2012

Export Citation:

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Assignee:

MITSUBISHI MOTORS CORP

International Classes:

F01N3/20; B01D53/94; F01N3/08; F02D41/04

Domestic Patent References:

JP2010024957A

2010-02-04

Foreign References:

WO2011114540A1	2011-09-22
WO2011114499A1	2011-09-22
WO2011114501A1	2011-09-22

Attorney, Agent or Firm:

Yu Sanada

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