Simulation of a Turbo Charged Spark Ignited Engine
Simulation of a Turbo Charged Spark Ignited Engine
Fredrik Pettersson
LiTH-ISY-EX-3010
Linköping Institute of Technology
Abstract
Computer simulation has become an important part of the
development of new automotive engines. A model of the engine which can
be simulated online may be used for model based control and diagnosis.
An effective control system and reliable diagnosis can lower both
fuel consumption and emissions.
Measurements made on a SAAB 2.3
litres turbo charged spark ignited engine are the base of the
simulation model. To enable physical modeling, the
engine is divided into subsystems. The pressures in the subsystems and
the angular speed of the turbine shaft are central properties that are
modeled dynamically. In addition to these models, static models of
e.g. temperatures and mass flow are developed. A combination of
physical modeling and black box modeling has been used to establish
the models of the subsystems.
The equations of every subsystem are implemented as blocks in
Simulink and the blocks are then connected to obtain a complete
simulation model. The results from the simulations are compared with
data from the
measurements. The dynamic models agree well with measured
data. The static models do also give acceptable results in most cases,
but some of them have to be developed further to make the model useful
for predictive purposes.
Some suggestions for further development and interesting applications
of the model are also given.
Fredrik Pettersson
2000
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