Articles | Volume 7, issue 1
Special issue:
Regular research article
16 Feb 2018
Regular research article |  | 16 Feb 2018

A pathway to eliminate the gas flow dependency of a hydrocarbon sensor for automotive exhaust applications

Gunter Hagen, Antonia Harsch, and Ralf Moos

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Methods to investigate the temperature distribution of heated ceramic gas sensors for high-temperature applications
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Multi-gas sensor to detect simultaneously nitrogen oxides and oxygen
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Combined resistive and thermoelectric oxygen sensor with almost temperature-independent characteristics
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Simulation of a thermoelectric gas sensor that determines hydrocarbon concentrations in exhausts and the light-off temperature of catalyst materials
Thomas Ritter, Sven Wiegärtner, Gunter Hagen, and Ralf Moos
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Cited articles

Bischof, M., Kessler, B., Moos, R., Müller, R., Müller, W., and Plog, C.: Arrangement of a heating layer for a high-temperature gas sensor, US Patent Specification, US 6,861,939 B1, 1999. 
Deutschmann, O. and Grunwaldt, J.-D.: Exhaust gas aftertreatment in mobile systems: status, challenges, and perspectives, Chem.-Ing.-Tech., 85, 595–617,, 2013. 
Hagen, G., Leupold, N., Wiegärtner, S., and Moos, R.: Sensor Tool for Fast Catalyst Material Characterization, Top. Catal., 60, 312–317,, 2017. 
Kita, J., Wiegärtner, S., Moos, R., Weigand, P., Pliscott, A., LaBranche, M. H., and Glicksman, H. D.: Screen-printable type S thermocouple for thick-film technology, Procedia Engineer., 120, 828–831,, 2015. 
Moos, R.: Automotive Exhaust Gas Sensors, in: Encyclopedia of Sensors, edited by: Grimes, C. A., Dickey, E. C., and Pishko, M. V., 1, 295–312, American Scientific Publishers, Stevenson Ranch, USA, 2006. 
Short summary
Monitoring hydrocarbon concentrations in automotive exhausts is affected by flow rate changes. The signal of thermoelectric gas sensors is a thermovoltage. Its origin is a temperature difference that depends on the flow rate. To avoid this noise effect, the sensor can be installed in a defined bypass position. As shown by simulation and experiments, the gas flow around the sensor is almost turbulence-free and the signal only depends on the hydrocarbon concentration and not on the flow rate.
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