Presented is the model based diagnostics of a three-way catalyst (TWC). The proposed TWC model relates measurable engine inputs (engine air mass (AM) and catalyst temperature) to a metric that quantifies TWC oxygen storage capacity. The TWC model structure is based on the dynamics of the TWC and identified using orthogonal least squares (OLS). The model coefficients are estimated using an instrumental variables four step (IV4) approach. TWC diagnostics is realized by means of an information synthesis (IS) technique where changes in the adapted TWC model coefficients are utilized to estimate TWC health. The approach is experimentally validated on a federal test procedure (FTP) drive cycle for healthy (full useful life, FUL) and failed (threshold) TWCs. The results will show that a 100% accurate classification in TWC health estimation (FUL or threshold) is produced for the catalysts tested.
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September 2011
Research Papers
Automotive Three-Way Catalyst Diagnostics with Experimental Results
Brandon M. Dawson,
Brandon M. Dawson
Department of Mechanical Engineering,
University of Houston
, Houston, TX 77204
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Matthew A. Franchek,
Matthew A. Franchek
Department of Mechanical Engineering,
University of Houston
, Houston, TX 77204
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Karolos Grigoriadis,
Karolos Grigoriadis
Department of Mechanical Engineering,
University of Houston
, Houston, TX 77204
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Robert W. McCabe,
Robert W. McCabe
Ford Motor Company
, Dearborn, MI 48124
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Mike Uhrich,
Mike Uhrich
Ford Motor Company
, Dearborn, MI 48124
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Steve Smith
Steve Smith
Ford Motor Company
, Dearborn, MI 48124
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Brandon M. Dawson
Department of Mechanical Engineering,
University of Houston
, Houston, TX 77204
Matthew A. Franchek
Department of Mechanical Engineering,
University of Houston
, Houston, TX 77204
Karolos Grigoriadis
Department of Mechanical Engineering,
University of Houston
, Houston, TX 77204
Robert W. McCabe
Ford Motor Company
, Dearborn, MI 48124
Mike Uhrich
Ford Motor Company
, Dearborn, MI 48124
Steve Smith
Ford Motor Company
, Dearborn, MI 48124J. Dyn. Sys., Meas., Control. Sep 2011, 133(5): 051008 (7 pages)
Published Online: August 5, 2011
Article history
Received:
November 24, 2008
Revised:
February 19, 2011
Online:
August 5, 2011
Published:
August 5, 2011
Citation
Dawson, B. M., Franchek, M. A., Grigoriadis, K., McCabe, R. W., Uhrich, M., and Smith, S. (August 5, 2011). "Automotive Three-Way Catalyst Diagnostics with Experimental Results." ASME. J. Dyn. Sys., Meas., Control. September 2011; 133(5): 051008. https://doi.org/10.1115/1.4004041
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