In-operation monitoring of the soot load of diesel particulate filters : initial tests

Titelangaben

Feulner, Markus ; Hagen, Gunter ; Piontkowski, Andreas ; Müller, Andreas ; Fischerauer, Gerhard ; Brüggemann, Dieter ; Moos, Ralf:
In-operation monitoring of the soot load of diesel particulate filters : initial tests.
2012
Veranstaltung: CAPOC9 - 9th International Congress on Catalysis and Automotive Pollution Control , Aug. 29 - 31, 2012 , Brussels, Belgium.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Paper )

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Abstract

Diesel particulate filters (DPF) are indispensable parts of modern automotive exhaust gas aftertreatment due to stringent emissions legislation. For a fuel-efficient control strategy, it would be beneficial to determine directly and in-operation their actual trapped soot mass. Two novel approaches – based on the electrical conductivity of trapped soot particles – emerged recently. By measuring the electrical resistance between different single walls inside the filter, the soot load is determined with local resolution. The microwave-based technique is a contactless approach that gives an integral value depending on the soot mass in the DPF. We present investigations on loading and regeneration of DPFs in a dynamometer test bench applying both methods. The results are compared with each other and correlated with the differential pressure and the soot mass. Especially the microwave-based technique has a potential for serial application.