Exhaust gas purification apparatus
US6820418B2 · kind B2 · utility
21Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2002 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | Dec 12, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/30
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A particulate filter (22) is arranged in an exhaust passage of an internal combustion engine. Whether the particulate deposited on the particulate filter (22) has changed in property to a property harder to oxidize compared with right after deposition is predicted or judged. When the fact that the particulate deposited on the particulate filter (22) has changed in property to a property harder to oxidize compared with right after deposition is predicted or judged, the air-fuel ratio of the exhaust gas flowing into the particulate filter (22) is switched temporarily from lean to rich.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.