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Sensors 2017, 17(2), 400; doi:10.3390/s17020400

Comparative Study of Different Methods for Soot Sensing and Filter Monitoring in Diesel Exhausts

Bayreuth Engine Research Center (BERC), Department of Functional Materials, University of Bayreuth, 95447 Bayreuth, Germany
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Author to whom correspondence should be addressed.
Academic Editor: Giovanni Neri
Received: 20 November 2016 / Revised: 29 January 2017 / Accepted: 11 February 2017 / Published: 18 February 2017
(This article belongs to the Collection Gas Sensors)
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Abstract

Due to increasingly tighter emission limits for diesel and gasoline engines, especially concerning particulate matter emissions, particulate filters are becoming indispensable devices for exhaust gas after treatment. Thereby, for an efficient engine and filter control strategy and a cost-efficient filter design, reliable technologies to determine the soot load of the filters and to measure particulate matter concentrations in the exhaust gas during vehicle operation are highly needed. In this study, different approaches for soot sensing are compared. Measurements were conducted on a dynamometer diesel engine test bench with a diesel particulate filter (DPF). The DPF was monitored by a relatively new microwave-based approach. Simultaneously, a resistive type soot sensor and a Pegasor soot sensing device as a reference system measured the soot concentration exhaust upstream of the DPF. By changing engine parameters, different engine out soot emission rates were set. It was found that the microwave-based signal may not only indicate directly the filter loading, but by a time derivative, the engine out soot emission rate can be deduced. Furthermore, by integrating the measured particulate mass in the exhaust, the soot load of the filter can be determined. In summary, all systems coincide well within certain boundaries and the filter itself can act as a soot sensor. View Full-Text
Keywords: particulate matter; soot; DPF; microwave; cavity perturbation; filter monitoring; soot load determination; resistive soot sensor; integrating sensor; dosimeter particulate matter; soot; DPF; microwave; cavity perturbation; filter monitoring; soot load determination; resistive soot sensor; integrating sensor; dosimeter
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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.; Hottner, K.; Redel, S.; Müller, A.; Moos, R. Comparative Study of Different Methods for Soot Sensing and Filter Monitoring in Diesel Exhausts. Sensors 2017, 17, 400.

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