Bypass purge for protecting against formation of reductant deposits
US8079211B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2008 |
| Grant date | Dec 20, 2011 |
| Priority date | — |
| Expiry date | Mar 12, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Systems and methods are provided for injecting liquid reductant into an engine exhaust. An example system includes a gas deflector positioned upstream of an injector where the gas deflector is configured to create a high pressure zone upstream of the deflector and a low pressure zone downstream of the deflector surrounding the injector outlet. A bypass flow passage diverts exhaust flow from the high pressure zone upstream of the deflector to allow the bypassed portion of exhaust to flow into the exhaust gas stream to form a gas shield for a liquid reductant spray from the injector. In this way, it is possible to reduce deposit formation and accumulation in the exhaust system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.