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

Sensors

Peter Fremerey¹  Sebastian Reiß¹  Andrea Geupel¹  Gerhard Fischerauer¹ 

[1] id="af1-sensors-11-08261">Bayreuth Engine Research Center (BERC), Universität Bayreuth, 95440 Bayreuth, Germa

关键词: on-board diagnosis;    emission control;    TWC;    DPF;    cavity perturbation;   

DOI  :  10.3390/s110908261

来源: mdpi

【 摘 要 】

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 NO_x storage and reduction catalysts (lean NO_x traps) in order to obtain further knowledge about the reactions occurring in the catalyst and to compare the results with those obtained by wirebound NO_x 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 NO_x loading detection in lean NO_x traps.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.