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RF-probing of Automotive Catalysts

Title data

Reiß, Sebastian ; Moos, Ralf ; Wedemann, Marion ; Spörl, Matthias ; Nerowski, Alexander ; Fischerauer, Gerhard:
RF-probing of Automotive Catalysts.
In: Proceedings SENSOR 2009. - Wunstorf : AMA Verband für Sensorik und Messtechnik e.V. , 2009 . - pp. 113-116
ISBN N 978-3-9810993-5-5

Official URL: Volltext

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Abstract in another language

In order to meet the strict emission regulations, gasoline operated vehicles are equipped with three-way catalysts (TWC) and lambda sensors are applied to control the exhaust gas aftertreatment system. Since the TWC achieves maximum conversion of hydrocarbons, carbon monoxide, and nitrogen oxides at λ ≈ 1, λ is measured by lambda-probes upstream and downstream of the catalyst and is readjusted if required (λ: normalized air-to-fuel ratio). This leads to an oscillating air-to-fuel-ratio that is damped by oxygen storage components in the washcoat of the TWC (ceria-zirconia mixed oxides). These ceria-based materials store oxygen under lean atmospheres (λ > 1) and release oxygen under rich conditions (λ < 1).

In the present contribution, aspects of a novel approach to determine the oxygen loading of a TWC by a contactless measurement and in-situ with the help of radio frequency (RF) without lambda-probes is presented.

Further data

Item Type: Article in a book
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 21 Apr 2015 07:16
Last Modified: 13 Nov 2015 10:15