Model-based turbocharger control: A common approach for SI and CI engines
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Modellbaserad turboreglering : en ansats för både otto- och dieselmotorer (Swedish)
In this master’s thesis, a turbine model and a common control structure for theturbocharger for SI and CI-engines is developed. To design the control structure,simulations are done on an existing diesel engine model with VGT. In order tobe able to make simulations for engines with a wastegated turbine, the model isextended to include mass flow and turbine efficiency for that configuration. Thedeveloped model has a mean absolute relative error of 3.6 % for the turbine massflow and 7.4 % for the turbine efficiency. The aim was to control the intake manifoldpressure with good transients and to use the same control structure for VGTand wastegate. By using a common structure, development and calibration timecan be reduced. The non-linearities have been reduced by using an inverted turbinemodel in the control structure, which consists of a PI-controller with feedforward.The controller can be tuned to give a fast response for CI engines and a slowerresponse but with less overshoot for SI engines, which is preferable.
Place, publisher, year, edition, pages
2011. , 60 p.
modeling, model-based control, non-linear control, turbocharged SI engine, turbocharged CI engine, wastegate, VGT
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-70288ISRN: LiTH-ISY-EX--11/4487--SEOAI: oai:DiVA.org:liu-70288DiVA: diva2:438625
Subject / course
Leufven, OskarThomasson, Andreas
Eriksson, Lars, Associate Professor