TWC: Lambda Control and OBD without Lambda Probe - An Initial Approach 2008-01-0916
To determine the oxygen storage capacity of three-way catalysts in gasoline-operated vehicles, lambda probes are best practice to measure the A/F ratio of the exhaust for monitoring indirectly the conversion efficiency. In this paper, initial tests of a novel approach are described to determine the oxygen loading of the TWC more directly by means of radio frequency without the use of lambda probes. Experiments in synthetic exhaust gas as well as dynamometer tests using ceria-containing commercial catalysts showed that characteristic parameters of the radio-frequency signal coincide with the oxidation/reduction state of the TWC.
Citation: Moos, R., Spörl, M., Hagen, G., Gollwitzer, A. et al., "TWC: Lambda Control and OBD without Lambda Probe - An Initial Approach," SAE Technical Paper 2008-01-0916, 2008, https://doi.org/10.4271/2008-01-0916. Download Citation
Author(s):
Ralf Moos, Matthias Spörl, Gunter Hagen, Andreas Gollwitzer, Marion Wedemann, Gerhard Fischerauer
Affiliated:
Bayreuth Engine Research Center, University of Bayreuth, Bayreuth, Germany
Pages: 8
Event:
SAE World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Vehicle Sensors and Actuators, 2008-SP-2191
Related Topics:
Three-way catalysts
Radio frequency
Catalysts
Oxygen
Corrosion
Gases
Storage
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