Exhaust purification device of an internal combustion engine
US8209954B2 · kind B2 · utility
4Cited by
12References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 26, 2008 |
| Grant date | Jul 3, 2012 |
| Priority date | — |
| Expiry date | Aug 4, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An internal combustion engine wherein an NOx storing catalyst is arranged in an engine exhaust passage and an NOx selective reducing catalyst is arranged downstream of the NOx storing catalyst. Just before the air-fuel ratio of the exhaust gas flowing into the NOx storing catalyst is temporarily switched from lean to rich to release NOx from the NOx storing catalyst, an amount of NOx necessary for removing ammonia adsorbed on the NOx selective reducing catalyst is fed to the NOx selective reducing catalyst under a lean air-fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.