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Title:
EXHAUST GAS PURIFIER FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2008/001950
Kind Code:
A1
Abstract:
This invention provides an exhaust gas purifier for an internal combustion engine which executes HC supply control in which, when predetermined conditions are established, HC is supplied into an exhaust gas on the upstream side of an SOx scavenging material (11). When the amount of the scavenged SOx is smaller than a predetermined amount, a first HC supply control is carried out as the HC supply control in which HC is supplied into the exhaust gas in a predetermined pattern on the upstream of the SOx scavenging material. When the amount of the scavenged SOx is larger than a predetermined amount, a second HC supply control is carried out as the HC supply control. In the second HC supply control, HC is supplied into an exhaust gas on the upstream of the SOx scavenging material in such a pattern that is different from a predetermined pattern and can suppress a local rise in the temperature of the SOx scavenging material to a value above a predetermined temperature or can suppress the local formation of a rich area in terms of fuel-air ratio in the exhaust gas which flows into the SOx scavenging material.

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Inventors:
ASANUMA TAKAMITSU (JP)
HIROTA SHINYA (JP)
HAYASHI KOTARO (JP)
YOSHIDA KOHEI (JP)
HAYASHI ATSUSHI (JP)
Application Number:
PCT/JP2007/063508
Publication Date:
January 03, 2008
Filing Date:
June 29, 2007
Export Citation:
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Assignee:
TOYOTA MOTOR CO LTD (JP)
ASANUMA TAKAMITSU (JP)
HIROTA SHINYA (JP)
HAYASHI KOTARO (JP)
YOSHIDA KOHEI (JP)
HAYASHI ATSUSHI (JP)
International Classes:
F01N3/08; B01D46/42; B01D53/86; B01D53/94; F01N3/02; F01N3/20; F01N3/24; F01N3/36
Foreign References:
JP2005273573A2005-10-06
JP2004360575A2004-12-24
JPH09122443A1997-05-13
JP2000018021A2000-01-18
JPH06173652A1994-06-21
Other References:
See also references of EP 2039900A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon 37 Mori Bldg.5-1, Toranomon,3-chome, Minato-ku, Tokyo 23, JP)
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