Title:
EXHAUST EMISSION CONTROL DEVICE FOR DIESEL ENGINE
Document Type and Number:
Japanese Patent JP3780746
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To regenerate NOx catalysts without decreasing an excess air percentage.
SOLUTION: A combustion temperature lowering means 71 lowers engine combustion temperature depending upon engine operating conditions, and during such an operation of the combustion temperature lowering means 71, ignition lag time increasing means 72 extends a ignition lag time substantially, so that the heat generation pattern is in a single-stage combustion mode. A temperature- sensitive NOx catalyst 73 adsorbs NOx in exhaust, when the heat generation pattern is in the single-stage combustion mode as well as the exhaust temperature is not more than a preset value, and regenerates when the exhaust temperature exceeds the preset value. A determining means 74 determines whether has arrived, when the temperature-sensitive NOx catalyst 73 is to regenerate. An affirmative determination result signals combustion switching means 75 to change the combustion into a diffuse-combustion-basis mode.
Inventors:
Hiromichi Miwa
Yasuhisa Kitahara
Yasuhisa Kitahara
Application Number:
JP13389399A
Publication Date:
May 31, 2006
Filing Date:
May 14, 1999
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
F02D41/40; F02M25/07; F01N3/08; F01N3/24; F01N3/28; F02D21/08; F02D41/02; F02D41/04; F02D41/38; F02D43/00; F02D45/00; (IPC1-7): F02D41/40; F01N3/08; F01N3/24; F01N3/28; F02D21/08; F02D41/02; F02D41/04; F02D41/38; F02D43/00; F02D45/00; F02M25/07
Domestic Patent References:
| JP10141051A | ||||
| JP8218920A | ||||
| JP7004287A | ||||
| JP8086251A | ||||
| JP10054289A | ||||
| JP10054287A | ||||
| JP11117815A | ||||
| JP11081992A |
Attorney, Agent or Firm:
Masaki Goto
Yoshio Matsuda
Yoshio Matsuda