Procedure for checking the functionality of a metering valve of a NOx-reduction system of a combustion engine
US8145408B2 · kind B2 · utility
3Cited by
3References
7Claims
0Family size
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Key dates
| Filing date | Nov 3, 2009 |
| Grant date | Mar 27, 2012 |
| Priority date | — |
| Expiry date | Jun 5, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A procedure for checking the functionality of a metering valve (310) of a reducing agent system of a combustion engine, at which the metering device (105) is advanced from a tank (100) to the metering valve (310) with the aid of a controllable pump (12) at a constant pressure, comprising the metering valve (310) is impinged with a control variable that characterizes the causing of a status change of the metering valve (310), a variable is detected that characterized the flow rate of the pump (120), from this variable that characterizes the flow rate the functionality of the metering valve (310) is assumed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.