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Sensors 2015, 15(11), 28796-28806; doi:10.3390/s151128796

Conductometric Sensor for Soot Mass Flow Detection in Exhausts of Internal Combustion Engines

1
Department of Functional Materials, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany
2
Department of Engineering Thermodynamics and Transport Processes, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 11 September 2015 / Revised: 22 October 2015 / Accepted: 9 November 2015 / Published: 13 November 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1800 KB, uploaded 13 November 2015]   |  

Abstract

Soot sensors are required for on-board diagnostics (OBD) of automotive diesel particulate filters (DPF) to detect filter failures. Widely used for this purpose are conductometric sensors, measuring an electrical current or resistance between two electrodes. Soot particles deposit on the electrodes, which leads to an increase in current or decrease in resistance. If installed upstream of a DPF, the “engine-out” soot emissions can also be determined directly by soot sensors. Sensors were characterized in diesel engine real exhausts under varying operation conditions and with two different kinds of diesel fuel. The sensor signal was correlated to the actual soot mass and particle number, measured with an SMPS. Sensor data and soot analytics (SMPS) agreed very well, an impressing linear correlation in a double logarithmic representation was found. This behavior was even independent of the used engine settings or of the biodiesel content. View Full-Text
Keywords: on-board diagnostics (OBD); diesel particulate filter (DPF); soot sensor; accumulating sensor; soot-load determination; dosimeter on-board diagnostics (OBD); diesel particulate filter (DPF); soot sensor; accumulating sensor; soot-load determination; dosimeter
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Feulner, M.; Hagen, G.; Müller, A.; Schott, A.; Zöllner, C.; Brüggemann, D.; Moos, R. Conductometric Sensor for Soot Mass Flow Detection in Exhausts of Internal Combustion Engines. Sensors 2015, 15, 28796-28806.

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