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2588876 
Journal Article 
Conductometric soot sensor for automotive exhausts: initial studies 
Hagen, G; Feistkorn, C; Wiegärtner, S; Heinrich, A; Brüggemann, D; Moos, R 
2010 
1 
Sensors
ISSN: 1424-8220 
10 
3 
1589-1598 
English 
22294888 
WOS:000277158300009 
In order to reduce the tailpipe particulate matter emissions of Diesel engines, Diesel particulate filters (DPFs) are commonly used. Initial studies using a conductometric soot sensor to monitor their filtering efficiency, i.e., to detect a malfunction of the DPF, are presented. The sensors consist of a planar substrate equipped with electrodes on one side and with a heater on the other. It is shown that at constant speed-load points, the time until soot percolation occurs or the resistance itself are reproducible means that can be well correlated with the filtering efficiency of a DPF. It is suggested to use such a sensor setup for the detection of a DPF malfunction. 
on-board diagnosis (OBD); diesel particulate filter (DPF); emission legislation; diesel particulate matter (PM)