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Sensors 2011, 11(9), 8261-8280; doi:10.3390/s110908261

Determination of the NOx Loading of an Automotive Lean NOx Trap by Directly Monitoring the Electrical Properties of the Catalyst Material Itself

Bayreuth Engine Research Center (BERC), Universität Bayreuth, 95440 Bayreuth, Germany
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Received: 5 August 2011 / Revised: 12 August 2011 / Accepted: 16 August 2011 / Published: 25 August 2011
(This article belongs to the Section Chemical Sensors)
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Abstract

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. View Full-Text
Keywords: on-board diagnosis; emission control; TWC; DPF; cavity perturbation on-board diagnosis; emission control; TWC; DPF; cavity perturbation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Fremerey, P.; Reiß, S.; Geupel, A.; Fischerauer, G.; Moos, R. Determination of the NOx Loading of an Automotive Lean NOx Trap by Directly Monitoring the Electrical Properties of the Catalyst Material Itself. Sensors 2011, 11, 8261-8280.

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