Microwave-Based Oxidation State and Soot Loading Determination on Gasoline Particulate Filters with Three-Way Catalyst Coating for Homogenously Operated Gasoline Engines

Title data

Dietrich, Markus ; Jahn, Christoph ; Lanzerath, Peter ; Moos, Ralf:
Microwave-Based Oxidation State and Soot Loading Determination on Gasoline Particulate Filters with Three-Way Catalyst Coating for Homogenously Operated Gasoline Engines.
In: Sensors. Vol. 15 (2015) Issue 9 . - pp. 21971-21988.
ISSN 1424-8220
DOI der Verlagsversion: https://doi.org/10.3390/en8088887

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Abstract

Recently, a novel method emerged to determine the oxygen storage degree of three way catalysts (TWC) by a microwave-based method. Up to now, this method has been investigated only in lab-scale reactors or under steady state conditions. This work expands those initial studies. A TWC-coated gasoline particulate filter was investigated in a dynamic engine test bench simulating a typical European driving cycle (NEDC). It could be shown that both the oxygen storage degree and the soot loading can be monitored directly, but not simultaneously due to their competitive effects. Under normal driving conditions, no soot accumulation was observed, related to the low raw emissions and the catalytic coating of the filter. For the first time, the quality factor of the cavity resonator in addition to the resonance frequency was used, with the benefit of less cross sensitivity to inconstant temperature and water. Therefore, a temperature dependent calibration of the microwave signal was created and applied to monitor the oxidation state in transient driving cycles. The microwave measurement mirrors the oxidation state determined by lambda probes and can be highly beneficial in start-stop phases (where lambda-probes do not work) and to determine the oxygen storage capacity (OSC) without unnecessary emissions.

Further data

Item Type:	Article in a journal
Keywords:	gasoline particulate filter (GPF); three-way catalytic converter (TWC); oxygen storage capacity (OSC); on-board diagnostics (OBD); microwave cavity perturbation method; New European Driving Cycle (NEDC); lambda probe
DDC Subjects:	600 Technology, medicine, applied sciences > 620 Engineering
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 Profile Fields > Advanced Fields > Advanced Materials Research Institutions > Central research institutes > Bayreuth Center for Material Science and Engineering - BayMAT Research Institutions > Research Units > Zentrum für Energietechnik - ZET Research Institutions > Research Units > BERC - Bayreuth Engine Research Center Faculties Faculties > Faculty of Engineering Science > Chair Functional Materials Profile Fields Profile Fields > Advanced Fields Research Institutions Research Institutions > Central research institutes Research Institutions > Research Units
Language:	English
Originates at UBT:	Yes
Date Deposited:	21 Sep 2015 12:04
Last Modified:	22 Jun 2020 07:25
URI:	https://epub.uni-bayreuth.de/id/eprint/3163

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