| Original document(29 pages) Authorized document(29 pages) 中文版 |
The invention discloses apparatus and a method for exhaust gas purification in an internal combustion engine. In order to improve an exhaust gas purification performance immediately after a cold engine is started, firstly for HC purification, an air-fuel ratio is controlled to be in a lean range immediately after the engine start. Next for NOx purification, the air-fuel ratio is switched to be from lean to rich based upon a parameter (engine load, namely, fuel injection amount) related to NOx density at an engine exit or a parameter (catalyst temperature or water temperature) related to the catalyst temperature. The air-fuel ratio to be rich is set as a plurality of values based upon the parameter and as a richer range as the parameter shows high density or high temperature. |
Application Number
申请号 |
03101537 |
Application Date
申请日 |
2003.01.10 |
| Title 名称 |
Appts. and method for exhaust and purification of I.C. engine |
Publication Number
公开号 |
1431393 |
Publication Date
公开日 |
2003.07.23 |
| Approval Pub. Date |
2006.11.15 |
Granted Pub. Date |
2006.11.15 |
| International Classification 分类号 |
F02D41/26;F01N3/20 |
Applicant(s) Name
申请人 |
Nissan Motor Co., Ltd. |
| Address 地址 |
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| Inventor(s) Name 发明人 |
Okuma Hajime |
| Attorney & Agent 代理人 |
jiang xurong |
| More information 更 多 信 息 |
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