Replacing the lambda probe by radio frequency-based in-operando three-way catalyst oxygen loading detection

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Beulertz, Gregor ; Votsmeier, Martin ; Herbst, Felix ; Moos, Ralf:
Replacing the lambda probe by radio frequency-based in-operando three-way catalyst oxygen loading detection.
In: 14th International Meeting on Chemical Sensors : IMCS 2012. - Wunstorf : AMA Verband für Sensorik und Messtechnik e.V. , 2012 . - S. 1426-1428
ISBN 978-3-9813484-2-2
DOI: https://doi.org/10.5162/IMCS2012/P2.2.7

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Abstract

A novel strategy for closed-loop controlling the stoichiometric combustion of gasoline engines is presented. In contrast to common strategies which use the signal two lambda probes up-and downstream of a three way catalyst to control the engine, here the oxygen loading degree of a threeway catalyst is directly and in-operando determined by a radio frequency-based method and used as the process variable. Initial tests at a high dynamic laboratory test bench show that such a controlling strategy may lead to much lower emissions. Hence, there is a chance to replace lambda probes.