Mikrowellenbasierte Katalysatorzustandserkennung zur Regelung von Ottomotoren Microwave-based catalyst state observation for SI-engine control

Schödel, Sebastian; Fischerauer, Gerhard
November 2014
Technisches Messen;Nov2014, Vol. 81 Issue 11, p566
Academic Journal
Der Wunsch, Drei-Wege-Katalysatoren mit reduziertem Edelmetallgehalt für die Abgasnachbehandlung einsetzen zu können, verlangt nach einer zuverlässigen Information über den tatsächlichen Katalysatorzustand. Bekannte Verfahren schätzen den zur Schadgaskonvertierung nötigen Füllstand des Sauerstoffspeichers sowie die Speicherkapazität der katalytischen Beschichtung aus den gemessenen Luftzahlen vor und hinter dem Katalysator. Zur Verbesserung dieser bis heute etablierten Verfahren stellen wir einen mikrowellenbasierten Ansatz zur direkten Katalysatorzustandserkennung vor. Auf Grundlage dieser Zustandsinformationen können angepasste Regelungsstrategien dazu beitragen, die Verbrauchs- und Ressourceneffizienz in Kraftfahrzeugen zu verbessern. The desire to reduce the noble-metal content in three-way catalysts for exhaust gas aftertreatment systems can only be satisfied by reliable information about the actual catalyst state. A common method to estimate the oxygen storage level, needed to convert the pollutants, is based on measured air-fuel ratios up- and downstream of the three-way catalyst. We present a microwave-based approach with the potential to improve these established methods. Based on this state information, adapted control strategies may pave the way for consumption- and resource-efficient vehicles.


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