Title:
EXHAUST GAS EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE AND EXHAUST GAS EMISSION CONTROL METHOD
Document Type and Number:
Japanese Patent JP3911951
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To eliminate PM (particulates) as well as to treat NOx at high efficiency under an oxygen excessive environment of a diesel engine.
SOLUTION: Oxidizing catalyst 4 is disposed in an upstream casing 2a, and a hollow cylindrical DPF 50 whose one end is closed for collecting PM is disposed in a downstream casing 2b. The oxidizing catalyst 4 has a HC adsorbing catalyst, a function for generating NO2 by oxidizing NO, and an absorbing performance of HC. The DPF 50 is composed of an inner layer part 51 and an outer layer part 52, the inner layer part 51 has a HC adsorbing catalyst, and the outer layer part 52 has a reduction component concentration fluctuating type NOx catalyst. The PM of the DPF 50 is eliminated by NO2 generated by the oxygen catalyst in association with temperature change during operation, and NOx of the outer layer part 52 is discharge reduction purified by HC concentration fluctuation.
Inventors:
Motohiro Niizawa
Hiroshi Akama
Yasuhisa Kitahara
Hiroshi Akama
Yasuhisa Kitahara
Application Number:
JP2000052825A
Publication Date:
May 09, 2007
Filing Date:
February 29, 2000
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
F01N3/02; B01D53/94; F01N3/24; B01J23/42; B01J23/58; B01J23/63; B01J23/652; B01J23/656; B01J23/89; B01J29/44; B01J29/46; B01J29/74; B01J29/78; B01J35/02; B01J35/04; F01N3/023; F01N3/025; F01N3/029; F01N3/035; F01N3/08; F01N3/20; F01N3/28; F01N13/02; (IPC1-7): F01N3/24; B01D53/94; B01J23/42; B01J23/63; B01J23/58; B01J23/652; B01J23/656; B01J23/89; B01J29/44; B01J29/46; B01J29/74; B01J29/78; B01J35/02; B01J35/04; F01N3/02; F01N3/08; F01N3/20; F01N3/28
Domestic Patent References:
| JP11336530A | ||||
| JP8338229A | ||||
| JP6264718A | ||||
| JP6307230A | ||||
| JP10235199A | ||||
| JP3138411A | ||||
| JP7054638A | ||||
| JP2000002132A | ||||
| JP9053442A | ||||
| JP2000045755A |
Foreign References:
| WO1998048153A1 |
Attorney, Agent or Firm:
Tsuyoshi Hashimoto
Hiromichi Kobayashi
Tomioka Kiyoshi
Hiromichi Kobayashi
Tomioka Kiyoshi