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Title:
EXHAUST GAS DECONTAMINATION SYSTEM AND METHOD OF EXHAUST GAS DECONTAMINATION
Document Type and Number:
WIPO Patent Application WO/2003/069137
Kind Code:
A1
Abstract:
An exhaust gas decontamination system and a method of exhaust gas decontamination wherein in the regeneration of NOx occlusion reduction type catalyst with respect to a lean-burn engine or diesel engine, even in the instance of rich burning accompanied by EGR, the NOx released from the NOx occlusion reduction type catalyst can satisfactorily be reduced and purged to thereby exhibit a high NOx removal ratio. The exhaust gas decontamination system (1) provided with the NOx occlusion reduction type catalyst (30) includes control unit (C1) comprising normal control driving means (C10), regeneration control initiation deciding means (C20), catalyst activation control driving means (C30) and rich-burn control driving means (C40) capable of lowering the concentration of oxygen in the exhaust gas so as to realize such a constitution that a catalyst activation control driving for activating the catalyst is carried out just before rich burning accompanied by EGR.

Inventors:
Gabe, Masashi c/o Isuzu Motors LImited (Fujisawa Factory 8, Tsuchidan, Fujisawa-shi Kanagawa, 252-8501, JP)
Nagaoka, Daiji c/o Isuzu Motors LImited (Fujisawa Factory 8, Tsuchidan, Fujisawa-shi Kanagawa, 252-8501, JP)
Application Number:
PCT/JP2003/001382
Publication Date:
August 21, 2003
Filing Date:
February 10, 2003
Export Citation:
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Assignee:
ISUZU MOTORS LIMITED (26-1, Minami-Ohi 6-chome Shinagawa-ku, Tokyo, 140-0013, JP)
Gabe, Masashi c/o Isuzu Motors LImited (Fujisawa Factory 8, Tsuchidan, Fujisawa-shi Kanagawa, 252-8501, JP)
Nagaoka, Daiji c/o Isuzu Motors LImited (Fujisawa Factory 8, Tsuchidan, Fujisawa-shi Kanagawa, 252-8501, JP)
International Classes:
F01N3/08; F01N3/28; F02D41/02; F02D41/14; F02D41/40; F02M25/07; F02B37/00; F02D11/10; F02D21/08; F02D41/00; (IPC1-7): F01N3/08; F01N3/20; F02D41/04
Foreign References:
JP2001055950A2001-02-27
JPH06317142A1994-11-15
JP2000130216A2000-05-09
JP2001115829A2001-04-24
JPH11303660A1999-11-02
Other References:
See also references of EP 1475521A4
None
Attorney, Agent or Firm:
Ogawa, Shin-ichi (Ogawa, Noguchi & Saika International Patent Office Akiyama Building, 22-13, Toranomon 1-chom, Minato-ku Tokyo, 105-0001, JP)
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