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Abstract |
Mean Value Engine Modeling of a Turbo Charged Spark Ignited Engine - A Principle Study
Object oriented modeling of physical systems is an interesting paradigm, which has the
potential to offer reusable models and model components. The aim of this study i to
investigate how to build mean value models for automotive engines. MathModelica, a
modeling tool for the object oriented modeling language Modelica, is used in this study. Several sub models have been developed for the different parts of the engine. Th models
cover the air filter, intercooler, throttle, base engien, exhaust system, compressor,
turbine, turbine shaft, and volumes. It is shown how the components can be connected to
form both turbo charged engines as well as a naturally aspirated engines, which shows
that the paradigm is applicable for the modeling and confirms the modeling principle.
One problem that has popped up att several occasions is the selection of initial conditions
for the simulation. Especially when restrictions with low pressure drops are connected
between two volumes, the simulation engine has problems finding initial conditions. The models have been compared to measured engine data collected at a test bench in
Vehicular Systems laboratory at Linköping University. The agreement with measurement data
is good and the models work as expected.
Jan Brugård, Lars Eriksson and Lars Nielsen
2001
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Last updated: 2021-11-10
