Title:
EXHAUST EMISSION CONTROL DEVICE OF DIESEL ENGINE
Document Type and Number:
Japanese Patent JP3680637
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enable regeneration of a catalyst while preventing degradation of smoke.
SOLUTION: In this exhaust emission control device, determining means 73 determines whether this device is in an EGR region or not, and based on this result, control means 74 controls displacement circulated in an EGR region in an air-intake An NOx absorbed amount in an HC fluctuation type catalyst 72 is saturated, fluctuation means 75 fluctuates concentration of HC in exhaust gas flowing in the HC fluctuation type catalyst 72 in the EGR region. When the NOx absorbed amount of λ fluctuation type catalyst 71 reaches saturation, rich means 76 enriches air-fuel ratio of the exhaust gas flowing in the λ fluctuation type catalyst 71 in a region other than the EGR region.
Inventors:
Yasuhisa Kitahara
Manabu Miura
Manabu Miura
Application Number:
JP16499899A
Publication Date:
August 10, 2005
Filing Date:
June 11, 1999
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
B01D53/86; B01D53/94; F01N3/08; F01N3/20; F01N3/24; F01N3/28; F02B37/00; F02B37/12; F02B37/22; F02D41/04; F02D41/38; F02D41/40; F02D43/00; F02M25/07; (IPC1-7): F01N3/24; B01D53/86; B01D53/94; F01N3/08; F01N3/20; F01N3/28; F02B37/00; F02B37/12; F02B37/22; F02D41/04; F02D41/38; F02D41/40; F02D43/00; F02M25/07
Domestic Patent References:
| JP11093641A | ||||
| JP8218920A | ||||
| JP8303309A |
Attorney, Agent or Firm:
Masaki Goto
Yoshio Matsuda
Yoshio Matsuda
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