Exhaust emission purifying device for internal combustion engine
US6672051B2 · kind B2 · utility
12Cited by
14References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2001 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Mar 30, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
When exhaust gases flowing into catalysts (e.g., a NOx catalyst and a three-way catalyst) continue to be in the fuel-rich atmosphere for a predetermined period of time or longer, an exhaust emission purifying device for an internal combustion engine leans an air-fuel mixture or supplies the secondary air to the exhaust gases in order to turn the exhaust gases flowing into catalysts into an oxygen-rich atmosphere. This enables the proper regeneration of the degraded catalysts, and thus improves an exhaust emission control performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.