Exhaust gas purifier for use in internal combustion engine
US6718756B1 · kind B1 · utility
10Cited by
20References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2000 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Sep 21, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
When a NOx-releasing unit is operated to change an air-fuel ratio to a rich side to thereby establish a low-oxygen-concentration atmosphere of an exhaust gas such that NOx is released from a NOx catalyst, a reducer-supplying unit 33 additionally supplies a reducer during an operating period of the NOx-releasing unit for reducing NOx released into an exhaust path such that release of NOx balances with reduction of NOx, thereby reducing NOx released from the NOx catalyst and thus suppressing worsening of exhaust gas performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.