Exhaust gas purification device of an engine
US5423181A · kind A · utility
69Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1993 |
| Grant date | Jun 13, 1995 |
| Priority date | — |
| Expiry date | Sep 1, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An engine comprising an exhaust passage having therein a NO.sub.x absorbent which absorbs the NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent is lean and releases the absorbed NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent becomes the stoichiometric air-fuel ratio or rich. When the air-fuel ratio of the air-fuel mixture should be changed over from lean to the stoichiometric air-fuel ratio, the air-fuel ratio of the air-fuel mixture is temporarily made rich and is then made the stoichiometric air-fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.