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Control-Oriented Model of Molar Scavenge Oxygen Fraction for Exhaust Recirculation in Large Diesel Engines
MAN Diesel and Turbo, Denmark; Technical University of Denmark, Denmark.
Technical University of Denmark, Denmark; Norwegian University of Science and Technology, Norway.
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, Faculty of Science & Engineering.
MAN Diesel and Turbo, Denmark.
2017 (English)In: Journal of Dynamic Systems Measurement, and Control, ISSN 0022-0434, E-ISSN 1528-9028, Vol. 139, no 2, 021007Article in journal (Refereed) Published
Abstract [en]

Exhaust gas recirculation (EGR) systems have been introduced to large marine engines in order to reduce NOx formation. Adequate modeling for control design is one of the bottlenecks to design EGR control that also meets emission requirements during transient loading conditions. This paper therefore focuses on deriving and validating a mean-value model of a large two-stroke crosshead diesel engine with EGR. The model introduces a number of amendments and extensions to previous, complex models and shows in theory and practice that a simplified nonlinear model captures all essential dynamics that is needed for EGR control. Our approach is to isolate and reduce the gas composition part of the more complex models using nonlinear model reduction techniques. The result is a control-oriented model (COM) of the oxygen fraction in the scavenge manifold with three molar flows being inputs to the COM, and it is shown how these flows are estimated from signals that are commonly available. The COM is validated by first comparing the output to a simulation of the full model, then by comparing with measurement series from two engines. The control-oriented nonlinear model is shown to be able to replicate the behavior of the scavenge oxygen fraction well over the entire envelope of load and blower speed range that are relevant for EGR. The simplicity of the new model makes it suitable for observer and control design, which are essential steps to meet the emission requirements for marine diesel engines that take effect from 2016.

Place, publisher, year, edition, pages
ASME , 2017. Vol. 139, no 2, 021007
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-134475DOI: 10.1115/1.4034750ISI: 000391561400007OAI: oai:DiVA.org:liu-134475DiVA: diva2:1074438
Available from: 2017-02-15 Created: 2017-02-15 Last updated: 2017-02-15

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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  • Other style
More styles
Language
  • de-DE
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  • nn-NB
  • sv-SE
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More languages
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