EGR-VGT Control and Tuning for Pumping Work Minimization and Emission Control
2010 (English)In: IEEE Transactions on Control Systems Technology, ISSN 1063-6536, E-ISSN 1558-0865, Vol. 18, no 4, 993-1003 p.Article in journal (Refereed) Published
A control structure is proposed and investigated for coordinatedcontrol of EGR valve and VGT position in heavy duty diesel engines.Main control goals are to fulfill the legislated emission levels, toreduce the fuel consumption, and to fulfill safe operation of theturbocharger. These goals are achieved through regulation ofnormalized oxygen/fuel ratio and intake manifoldEGR-fraction. These are chosen both as main performance variables andfeedback variables since they contain information about when it ispossible to decrease the fuel consumption by minimizing the pumpingwork. Based on this a novel and simple pumping work minimizationstrategy is developed.The proposed performance variables are also strongly coupled to theemissions which makes it easier to adjust set-points, e.g. dependingon measured emissions during an emission calibration process, since itis more straightforward than control of manifold pressure and air massflow. Further, internally the controller is structured to handle thedifferent control objectives. Controller tuning is important forperformance but can be time consuming and to meet this end a method isdeveloped where the controller objectives are captured in a costfunction, which makes automatic tuning possible even though objectivesare conflicting. Performance trade-offs are necessary and areillustrated on the European Transient Cycle. The proposed controlleris validated in an engine test cell, where it is experimentallydemonstrated that the controller achieves all the control objectivesand that the current production controller has at least 26% higherpumping losses compared to the proposed controller.
Place, publisher, year, edition, pages
2010. Vol. 18, no 4, 993-1003 p.
Diesel engine modeling, engine control
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-18336DOI: 10.1109/TCST.2009.2031473ISI: 000278997400023OAI: oai:DiVA.org:liu-18336DiVA: diva2:218335
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Johan Wahlström, Lars Eriksson and Lars Nielsen, EGR-VGT Control and Tuning for Pumping Work Minimization and Emission Control, 2010, IEEE Transactions on Control Systems Technology, (18), 4, 993-1003.