EXHAUST PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE

Title:

EXHAUST PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/2010/116535

Kind Code:

A1

Abstract:

An exhaust purification device for internal combustion engines performs sulfur poisoning regeneration control by a NOx occluding reduction catalyst (24) being disposed in the engine exhaust system. The catalyst occludes NOx contained in the exhaust gas when the air-to-fuel ratio of the inflowing exhaust gas is lean, and reduces and scrubs the occluded NOx when the air-to-fuel ratio of the inflowing exhaust gas is at the theoretical air-to-fuel ratio or rich; and the device, when SOx occluded by the NOx occluding reduction catalyst (24) needs to be released, raises the catalyst temperature of the NOx occluding reduction catalyst (24) to the SOx release temperature and also enriches the air-to-fuel ratio of the inflowing exhaust gas. When execution of sulfur poisoning regeneration control is required, the SOx emission rate, which is the rate at which SOx that has been occluded by the NOx occluding reduction catalyst (24) is released, is calculated, and sulfur poisoning regeneration control is stopped when that value is less than a minimum emission rate.

Inventors:

YOSHIDA KOHEI (JP)
SOBUE YUICHI (JP)
OTSUKI HIROSHI (JP)
IIDA MASAHIDE (JP)
KURISAKA ITSUYA (JP)
SUGAWARA KOU (JP)

Application Number:

PCT/JP2009/057405

Publication Date:

October 14, 2010

Filing Date:

April 06, 2009

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
YOSHIDA KOHEI (JP)
SOBUE YUICHI (JP)
OTSUKI HIROSHI (JP)
IIDA MASAHIDE (JP)
KURISAKA ITSUYA (JP)
SUGAWARA KOU (JP)

International Classes:

F01N3/20; F01N3/08

Foreign References:

JP2005098177A	2005-04-14
JP2008267213A	2008-11-06
JP2005291130A	2005-10-20
JP2009068481A	2009-04-02

Other References: