Determination of the NOx loading of an automotive lean NOx trap by directly monitoring the electrical properties of the catalyst material itself
| Autor: | Peter Fremerey, Andrea Geupel, Ralf Moos, Sebastian Reiß, Gerhard Fischerauer |
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| Rok vydání: | 2011 |
| Předmět: |
on-board diagnosis
emission control TWC DPF cavity perturbation Automotive industry lcsh:Chemical technology Biochemistry Automotive engineering Catalysis Article Analytical Chemistry Trap (computing) Electrochemistry lcsh:TP1-1185 Electrical and Electronic Engineering Microwaves Instrumentation Nitrogen oxides Automotive exhaust NOx Vehicle Emissions Diesel particulate filter business.industry Chemistry Atomic and Molecular Physics and Optics Nitrogen Oxides business Microwave |
| Zdroj: | Sensors (Basel, Switzerland) Sensors; Volume 11; Issue 9; Pages: 8261-8280 Sensors, Vol 11, Iss 9, Pp 8261-8280 (2011) |
| ISSN: | 1424-8220 |
| Popis: | Recently, it has been shown that the degree of loading of several types of automotive exhaust aftertreatment devices can be directly monitored in situ and in a contactless way by a microwave-based method. The goal of this study was to clarify whether this method can also be applied to NOx storage and reduction catalysts (lean NOx traps) in order to obtain further knowledge about the reactions occurring in the catalyst and to compare the results with those obtained by wirebound NOx loading sensors. It is shown that both methods are able to detect the different catalyst loading states. However, the sensitivity of the microwave-based method turned out to be small compared to that previously observed for other exhaust aftertreatment devices. This may limit the practical applicability of the microwave-based NOx loading detection in lean NOx traps. |
| Databáze: | OpenAIRE |
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