Mean value engine model for early stage design of powertrains with turbocharged SI engines Online publication date: Mon, 11-Dec-2017
by Cornelius Von Heyden; Jens Neumann; Werner Eißler
International Journal of Powertrains (IJPT), Vol. 6, No. 4, 2017
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.
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