An investigation on ignition-delay modelling for control

Research output: Contribution to journalArticle

Abstract

The ignition delay is an important quantity in low temperature combustion concepts where a prolonged ignition delay gives an enhanced fuel-air mixing process, favorable for decreased particulate and NOx emission levels. This article investigates three different low-order physics-based correlation models and their ability to predict the ignition delay for the purpose of model-based controller design. This is done by the principle of cross validation, i.e., by first training the models on a training data set and then evaluating the models prediction performance on a cross-validation data set. The models relate the state of the gas mixture after the point of fuel injection in order to predict the ignition delay. The experiments were all performed on a 6-cylinder direct-injection Scania diesel engine with a fuel mixture of 80 volume % gasoline and 20 volume % N-heptane. The results showed that ignition delay variation was not easily predicted when the injection timing was varied close to top dead center. The results also showed that a more complex model did not necessarily give an increased prediction performance at individual operating points. The simplest model which was more easily linearized and calibrated thus showed to be a good option for model-based controller design.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Control Engineering
  • Energy Engineering

Keywords

  • Ignition-delay modelling, Modelling for control, Partially premixed combustion, PPC, System identification
Original languageEnglish
Pages (from-to)282-306
Number of pages25
JournalInternational Journal of Powertrains
Volume6
Issue number3
Publication statusPublished - 2017
Publication categoryResearch
Peer-reviewedYes

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