Exhaust gas aftertreatment system for a diesel engine and method of increasing a temperature of an SCR catalyst to reduce NOx in exhaust gases
US8534050B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2009 |
| Grant date | Sep 17, 2013 |
| Priority date | — |
| Expiry date | May 7, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust gas aftertreatment system for a diesel engine is provided. The system includes a controller operably coupled to the engine that induces the engine to combust a rich air/fuel mixture in at least one cylinder at a predetermined time interval after startup of the engine to output exhaust gases including elevated levels of CO, and a percentage increase in HC that is less than a minimal threshold percentage relative to combusting a lean air/fuel mixture. The system further includes a diesel oxidation catalyst that receives the exhaust gases and oxidizes the CO to obtain an exothermic reaction that increases a temperature of the exhaust gases flowing through the oxidation catalyst to greater than a threshold temperature level. The system further includes an SCR catalyst which receives the exhaust gases and reduces NOx in the exhaust gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.