Exhaust purification device and exhaust purification method of internal combustion engine
US7146800B2 · kind B2 · utility
26Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2004 |
| Grant date | Dec 12, 2006 |
| Priority date | — |
| Expiry date | Mar 2, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An exhaust purification device, including a NOx storing catalyst comprised of a precious metal catalyst and NOx absorbent, arranged in an engine exhaust passage, which increases the ratio of the nitrogen dioxide to the nitrogen monoxide produced when burning fuel under a lean air-fuel ratio when the NOx storing catalyst is not active compared with the time when the NOx storing catalyst is active under the same engine operating conditions and stores the nitrogen dioxide contained in the exhaust gas in the NOx absorbent at that time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.