Zusammenfassung
Die hochfrequenz- oder mikrowellenbasierte Katalysatorzustandsbestimmung bietet die Möglichkeit, einen Fahrzeugkatalysator an seinem optimalen Punkt zu betreiben. Dies wurde bereits bei der Bestimmung der Sauerstoffbeladung von Dreiwegekatalysatoren, der Rußbeladung von DPFs/GPFs und der Ammoniakbeladung von SCR-Katalysatoren auf Vanadium- und Zeolithbasis nachgewiesen. Letzteres jedoch nur im Labormaßstab in synthetischem Abgas und mit gasförmigem Ammoniak als Reduktionsmedium.
Nun werden Ergebnisse zusammengefasst, die auf einem Motorprüfstand mit in Serie befindlichen Fe- oder Cu-Zeolith-SCR-Katalysatoren gewonnen wurden. Dabei wurde eine Harnstoffwasserlösung als Reduktionsmedium verwendet. Die aktuelle Ammoniakbelastung wird mit dem Hochfrequenz-Messsystem ohne zusätzliche Sensoren direkt in Echtzeit erfasst und die Dosierung der Harnstoffwasserlösung wird gemäß einer neuartigen Zielbeladungsmethodik geregelt.
Die Beladungsregelung eines NH3-SCR-Katalysator-Systems auf minimale NOx-Emissionen mittels Hochfrequenzsensorik war sowohl im stationären als auch im transienten Betrieb erfolgreich.
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Moos, R., Dietrich, M. (2018). Beladungsregelung eines NH3-SCR-Katalysator-Systems auf minimale NOx-Emissionen mittels Hochfrequenzsensorik. In: Tille, T. (eds) Automobil-Sensorik 2. Springer Vieweg, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-56310-6_10
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