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

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,...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2015-11, Vol.15 (11), p.28796-28806
Main Authors: Feulner, Markus, Hagen, Gunter, Müller, Andreas, Schott, Andreas, Zöllner, Christian, Brüggemann, Dieter, Moos, Ralf
Format: Article
Language:English
Subjects:
accumulating sensor
Automotive engines
Correlation analysis
Diesel
Diesel engines
Diesel fuels
diesel particulate filter (DPF)
dosimeter
Electric currents
Electrodes
Energy consumption
Engines
Failure
Load
on-board diagnostics (OBD)
Oxidation
Sensors
Soot
soot sensor
soot-load determination
Temperature
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s151128796