Procedure for operating a combustion engine with a SCR-catalyzer
US8393143B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 2009 |
| Grant date | Mar 12, 2013 |
| Priority date | — |
| Expiry date | Aug 27, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A combustion engine has in the exhaust gas area a SCR-catalyzer with a NH3-filling level, a metering device for supplying the SCR-catalyzer with reactant for reducing nitrous gases, and a downstream NH3-sensitive NOx-sensor. One theoretical value for the NOx downstream of the SCR-catalyzer is compared to an actual NOx-value downstream of the SCR-catalyzer. A reasonability check includes determining a first value for one comparison parameter, which represents the state before a system intervention for adapting the NH3-filling level. A system intervention for adapting the NH3-filling level is carried out and a second value of the comparison parameter is detected. From the comparison of the first value and the second value the reasonability, the non-reasonability, or non-preciseness of the system intervention is assumed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.