A chemically informed, control-oriented model of a three-way catalytic converter

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A chemically informed, control-oriented model of a three-way catalytic converter

A chemically informed, control-oriented model of a three-way catalytic converter

Soumelldis, M.I. / Stobart, R.K. / Jackson, R.A.

Chemical activity inside a three-way catalytic converter (TWC) is highly complex and usually is not taken into account when developing TWC control-oriented models. Such models still remain to a large extent empirical and do not perform satisfactorily under a wider range of operating conditions. This work demonstrates how a very simple model, based on the basic chemical processes that take place inside the catalytic converter, can successfully capture a large part of the strongly non-linear TWC dynamic behaviour. The proposed model is based on the reactions of ceria oxidation and carbon monoxide oxidation, which appear to dominate the fast dynamics of oxygen storage and release respectively. In addition, the water-gas shift reaction is incorporated into the model, which is responsible for the slower dynamic response of the catalyst under rich operating conditions. With some mild assumptions, a discrete-time version of the model was implemented in MATLAB. The model is sufficiently simple in structure for in-vehicle use and can be used for control and on-board diagnostic purposes.

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Title :

A chemically informed, control-oriented model of a three-way catalytic converter

Additional title:

Chemisch informiertes, regelungsorientiertes Modell eines Dreiwegekatalysators

Contributors:

Soumelldis, M.I. (author) / Stobart, R.K. (author) / Jackson, R.A. (author)

Published in:

Proceedings of the Institution of Mechanical Engineers, Part D (Journal of Automobile Engineering) ; 221 , 9 ; 1169-1182

Publication date :

2007

Size :

14 Seiten, 19 Quellen

ISSN :

DOI :

https://doi.org/10.1243/09544070JAUTO259

Type of media :

Article (Journal)

Type of material :

Print

Language :

English

Keywords :

Kohlenmonoxid , Steuerungs- und Regelungssystem , Oxidation , Anwendung im Fahrzeugbau , Anwendung im Motorenbau , Dreiwegekatalysator , Simulations-Software , chemische Reaktion , theoretisches Modell , nichtlinearer Effekt , dynamisches Verhalten , Betriebsbedingung , Onboard-Diagnose-System

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