Emission control system
US6269633A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2000 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Mar 8, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An engine exhaust aftertreatment system is described in which lean NO.sub.x, exhaust aftertreatment devices are employed. Because temperature in the exhaust line varies as a function of distance from the engine and engine operating condition, exhaust aftertreatment devices are situated along the exhaust line to ensure that at least one of said exhaust aftertreatment devices operates at a temperature of high NO.sub.x conversion efficiency. Reductant quantity is scheduled by the engine's control unit to be supplied to the exhaust aftertreatment devices based on available information provided by sensors or embedded engine control unit models, including: temperature in the exhaust aftertreatment devices, available reductant in the exhaust stream, reductant storage in the exhaust aftertreatment devices, maximum adsorption capacity of the exhaust aftertreatment devices, engine operating conditions, and NO.sub.x, concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.