Method and apparatus to control injection of a reductant into an exhaust gas feedstream
US7469531B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 2006 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Dec 21, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method and apparatus to control injection of a reductant into the exhaust gas feedstream of an internal combustion engine adapted to operate in a lean air/fuel ratio region upstream of a catalytic reactor device is provided. A control module is operatively connected to the reductant metering device, and, adapted to effect flow of reductant into the exhaust gas feedstream. The method includes determining a preferred dosing ratio based upon parameters of the exhaust gas feedstream and the catalytic reactor device, and adjusting the preferred dosing ratio. A preferred reductant feed rate is determined, and the reductant is selectively dispensed at the preferred reductant feed rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.