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

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
* Author to whom correspondence should be addressed.
Received: 5 August 2011; in revised form: 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.
Keywords: on-board diagnosis; emission control; TWC; DPF; cavity perturbation

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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.

AMA 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(9):8261-8280.

Chicago/Turabian Style

Fremerey, Peter; Reiß, Sebastian; Geupel, Andrea; Fischerauer, Gerhard; Moos, Ralf. 2011. "Determination of the NOx Loading of an Automotive Lean NOx Trap by Directly Monitoring the Electrical Properties of the Catalyst Material Itself." Sensors 11, no. 9: 8261-8280.

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