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Title:
EXHAUST PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2009/125865
Kind Code:
A1
Abstract:
In an internal combustion engine, a SOx trap catalyst (13) for capturing SOx contained in exhaust gas is mounted in that portion of an engine exhaust path which is located upstream of a NOx occluding catalyst (15). When NOx is to be released from the NOx occluding catalyst (15), auxiliary fuel is injected into a combustion chamber (2) at a timing which is after the completion of injection of fuel into the combustion chamber (2) performed to generate an engine output and at which the fuel is combustible. In this process, the auxiliary fuel is injected such that the air/fuel ratio (A/F) of combustion gas in the combustion chamber (2) is not smaller than or equal to a minimum allowable air fuel ratio (M) at which SOx being captured by the SOx trap catalyst (13) is not released.

Inventors:
NISHIOKA HIROMASA (JP)
ASANUMA TAKAMITSU (JP)
YOSHIDA KOHEI (JP)
NAKATA YUKA (JP)
Application Number:
PCT/JP2009/057422
Publication Date:
October 15, 2009
Filing Date:
April 07, 2009
Export Citation:
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Assignee:
TOYOTA MOTOR CO LTD (JP)
NISHIOKA HIROMASA (JP)
ASANUMA TAKAMITSU (JP)
YOSHIDA KOHEI (JP)
NAKATA YUKA (JP)
International Classes:
F01N3/24; B01D53/86; B01D53/94; F01N3/08; F01N3/20; F02D41/04; F02D41/38; F02D41/40
Foreign References:
JP2008057368A2008-03-13
JP2000080947A2000-03-21
JP2008057376A2008-03-13
JP2006144624A2006-06-08
JP2005133610A2005-05-26
Other References:
See also references of EP 2280156A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon37 Mori Bldg., 5-1,Toranomon 3-chome,Minato-k, Tokyo 23, JP)
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