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Title:
EXHAUST EMISSION CONTROL DEVICE
Document Type and Number:
Japanese Patent JP3900010
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To dissolve a problem wherein HC to be more discharged after starting cannot be sufficiently purified since separation of HC from an HC adsorbent is started before a three-way catalyst reaches an activation temperature after cold starting of an engine, in an engine exhaust emission control device using the HC adsorbent.
SOLUTION: A plurality of carriers 21a-21d carrying the HC adsorbent and a catalyst metal are arranged with gaps (g) provided in the direction of a gas flow, and the length of the carrier 21d situated on the downstream side is set to a value lower than that of the carrier on the side situated upper stream thereof. The gaps (g) shut off heat transfer between the carriers situated and in front and in rear of the gaps and suppress transmission of heat to the downstream. Therefore, the increase of the temperature of the carrier on the downstream side is delayed, a temperature rising amount of a catalyst metal is increased, and treating efficiency during separation of the HC is improved. Turbulence of exhaust gas entering the cell of the barrier occurs at a gap and opportunity of exhaust gas making contact with the HC adsorbent is increased, resulting in improvement of HC trap performance. This constitution decreases the size of the exhaust emission control device.


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Inventors:
Masaaki Ashida
Koichi Mori
Shunichi Mitsuishi
Cormorant Yoshinao
Application Number:
JP2002155199A
Publication Date:
April 04, 2007
Filing Date:
May 29, 2002
Export Citation:
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Assignee:
Nissan Motor Co., Ltd
International Classes:
F01N3/24; F01N3/28; B01D53/94; F01N3/08; F01N3/10; (IPC1-7): F01N3/24; B01D53/94; F01N3/08; F01N3/10; F01N3/28
Domestic Patent References:
JP7232084A
JP8284646A
JP2001190960A
JP2001173437A
JP6262088A
Attorney, Agent or Firm:
Masaki Goto
Yoshio Matsuda



 
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