Internal combustion engine
US8904765B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2013 |
| Grant date | Dec 9, 2014 |
| Priority date | — |
| Expiry date | Aug 2, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The internal combustion engine has an upstream side NOx selective reduction catalyst and a downstream side NOx selective reduction catalyst which are arranged in an engine exhaust passage. The upstream side NOx selective reduction catalyst has a region where the NOx removal rate becomes substantially constant when the ratio of concentration of ammonia to NOx of the inflowing exhaust rises. The internal combustion engine has an operating state in that region where the ratio of concentration of ammonia to NOx is maintained. The downstream side NOx selective reduction catalyst has an ammonia oxidation ability which is larger than the upstream side NOx selective reduction catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.