title: Conductometric Sensor for Soot Mass Flow Detection in Exhausts of Internal Combustion Engines.
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.
authors.affiliation: Department of Functional Materials, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany. Funktionsmaterialien@uni-bayreuth.de.
authors.forename: Markus
authors.initials: M
authors.lastname: Feulner
authors.affiliation: Department of Functional Materials, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany. Funktionsmaterialien@uni-bayreuth.de.
authors.forename: Gunter
authors.initials: G
authors.lastname: Hagen
authors.affiliation: Department of Functional Materials, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany. Funktionsmaterialien@uni-bayreuth.de.|Department of Engineering Thermodynamics and Transport Processes, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany. Funktionsmaterialien@uni-bayreuth.de.
authors.forename: Andreas
authors.initials: A
authors.lastname: Müller
authors.affiliation: Department of Functional Materials, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany. Funktionsmaterialien@uni-bayreuth.de.
authors.forename: Andreas
authors.initials: A
authors.lastname: Schott
authors.affiliation: Department of Engineering Thermodynamics and Transport Processes, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany. LTTT@uni-bayreuth.de.
authors.forename: Christian
authors.initials: C
authors.lastname: Zöllner
authors.affiliation: Department of Engineering Thermodynamics and Transport Processes, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany. LTTT@uni-bayreuth.de.
authors.forename: Dieter
authors.initials: D
authors.lastname: Brüggemann
authors.affiliation: Department of Functional Materials, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany. Functional.Materials@uni-bayreuth.de.
authors.forename: Ralf
authors.initials: R
authors.lastname: Moos
keywords: accumulating sensor; diesel particulate filter (DPF); dosimeter; on-board diagnostics (OBD); soot sensor; soot-load determination