Modeling of a Turbo Charged SI Engine
Turbo charged SI engines are a major possibility in the current trend
of down-sized engines with preserved drivability
performance. Considering control and supervision it is favorable to
have a mean value model to be used e.g. in observer design. Such
models of turbo engines are similar to those of naturally aspirated
engines, but there are some special characteristics, e.g. the
interconnected gas flows, the intercooler, the difference in relative
sizes between the gas volumes (compared to naturally aspirated
engines), the turbo, and the waste gate. Here, a model is developed
with a strategy to find a model for each engine component (air filter,
compressor, after cooler (or intercooler), throttle, engine, turbine,
waste gate, and a lumped model for the catalyst and exhaust) as they
behave in an engine setting. When investigating agreement with
measured data and sensitivity of possible model structures, a number
of interesting issues are raised. The experiments and the model
validation have been performed on a Saab 2.3 l production
engine.
Lars Eriksson, Lars Nielsen, Jan Brugård, Johan Bergström, Fredrik Pettersson and Per Andersson
Elsevier Science,
2001
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