Automotive three-way catalyst diagnostics with experimental results

Brandon M. Dawson; Matthew Franchek; Karolos Grigoriadis; Robert W. Mccabe; Mike Uhrich; Steve Smith

doi:10.1115/1.4004041

Automotive three-way catalyst diagnostics with experimental results

Brandon M. Dawson, Matthew Franchek, Karolos Grigoriadis, Robert W. Mccabe, Mike Uhrich, Steve Smith

Research Institute

Research output: Contribution to journal › Review article

1 Scopus citations

Abstract

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.

Original language	English (US)
Article number	051008
Journal	Journal of Dynamic Systems, Measurement and Control, Transactions of the ASME
Volume	133
Issue number	5
DOIs	https://doi.org/10.1115/1.4004041
State	Published - Sep 2 2011

ASJC Scopus subject areas

Control and Systems Engineering
Information Systems
Instrumentation
Mechanical Engineering
Computer Science Applications

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abstract = "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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AU - Dawson, Brandon M.

AU - Franchek, Matthew

AU - Grigoriadis, Karolos

AU - Mccabe, Robert W.

AU - Uhrich, Mike

AU - Smith, Steve

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