EXHAUST GAS PURIFICATION APPARATUS FOR INTERNAL COMBUSTION ENGINE

Title:

EXHAUST GAS PURIFICATION APPARATUS FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/2009/031483

Kind Code:

A1

Abstract:

In an internal combustion engine, an NOx adsorption catalyst (12) is arranged in an exhaust gas passage of the engine, and an NOx selective reduction catalyst (14) is arranged in the downstream of the NOx adsorption catalyst (12). Right before the air/fuel ratio of the exhaust gas flowing into the NOx adsorption catalyst (12) is temporarily switched from lean to rich for discharging NOx from the NOx adsorption catalyst (12), NOx necessary for removing ammonia adsorbed onto the NOx selective reduction catalyst (14) is supplied to the NOx selective reduction catalyst (14) at a lean air/fuel ratio.

Inventors:

YOSHIDA KOHEI (JP)
ASANUMA TAKAMITSU (JP)
NISHIOKA HIROMASA (JP)
OTSUKI HIROSHI (JP)

Application Number:

PCT/JP2008/065626

Publication Date:

March 12, 2009

Filing Date:

August 26, 2008

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
YOSHIDA KOHEI (JP)
ASANUMA TAKAMITSU (JP)
NISHIOKA HIROMASA (JP)
OTSUKI HIROSHI (JP)

International Classes:

F01N3/08; B01D53/94; F01N3/24; F01N3/28; F02D41/04

Domestic Patent References:

WO2006008625A1

2006-01-26

Foreign References:

JP2004211679A	2004-07-29
JP2003065036A	2003-03-05
JP2000027634A	2000-01-25
JPH1130117A	1999-02-02

Other References: