Estimating the oxygen storage level of a three-way automotive catalyst

A moving horizon estimation strategy is developed for the determination of the oxygen storage level of a three-way automotive catalyst. The ability to store and release oxygen is a critical aspect to the operation of the three-way catalyst component in automotive emission control systems. Because th...

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Bibliographic Details
Main Authors: Muske, K.R., Peyton Jones, James C.
Format: Conference Proceeding
Language:English
Subjects:
Applied sciences
Automotive engineering
Catalysts
Computer science
control theory
systems
Control theory. Systems
Distortion
Distortion measurement
Engines
Estimation
Exact sciences and technology
Fuels
Modelling and identification
Oxygen
Prediction algorithms
Reliability
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Summary:A moving horizon estimation strategy is developed for the determination of the oxygen storage level of a three-way automotive catalyst. The ability to store and release oxygen is a critical aspect to the operation of the three-way catalyst component in automotive emission control systems. Because the oxygen storage level cannot be measured directly, it must be estimated from pre-catalyst and post-catalyst air fuel ratio sensor measurements for model-based control and monitoring applications. However, these sensors are subject to distortion and the engine operating conditions that produce low tail-pipe emissions also result in the oxygen storage level becoming unobservable for a significant fraction of typical engine operation. The moving horizon estimator presented in this work, based on the use of a combined catalyst oxygen storage/sensor distortion model, is able to provide reliable estimates under these circumstances. The estimation algorithm is demonstrated using experimental engine operating data.
ISSN:0743-1619
2378-5861
DOI:10.23919/ACC.2004.1383944