Title: Mean value engine model for early stage design of powertrains with turbocharged SI engines

Authors: Cornelius Von Heyden; Jens Neumann; Werner Eißler

Addresses: Powertrain Development, BMW AG, Hufelandstrasse 4-8, 80937 Munich, Germany ' Powertrain Development, BMW AG, Hufelandstrasse 4-8, 80937 Munich, Germany ' Energy Efficient Automotive Powertrain, TU Ilmenau, Ehrenbergstraße 29, 98693 Ilmenau, Germany

Abstract: Due to complexity and computing time, crank-angle resolved engine simulation does not fit the needs of early stage powertrain development. Therefore, a mean value model is developed to design powertrains with exhaust turbocharged spark ignition engines. As turbocharger size strongly affects the transient engine process, the interaction between turbocharger and internal combustion engine is investigated and a new method is presented to consider different turbocharger sizes within the same set of mean value engine data. To compensate the linearisation error in the mean value turbine, two new equations are derived. The newly introduced turbine factors enable the model to predict the transient engine behaviour. The model is successfully validated against measured data from transient driving manoeuvres and sample applications are given. The developed model offers a speed-up factor of 30-40 compared to a crank-angle resolved engine model and is especially suited when a large quantity of design parameters is varied.

Keywords: powertrain; vehicle; spark ignition engine; turbocharger; mean value model; MVM; early stage design; transient engine simulation.

DOI: 10.1504/IJPT.2017.088483

International Journal of Powertrains, 2017 Vol.6 No.4, pp.323 - 351

Received: 13 Nov 2015
Accepted: 23 May 2016
Published online: 11 Dec 2017 *

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