LiU startsida
Abstract |
Utveckling och Utvärdering av Simuleringsmodell för Laddluftssystem
Higher demands on lower fuel consumption, as well as unchanged or
improved performance, are key factors in the development of engine
combustion systems today. Common systems on the market are different
types of supercharging systems with known benefits and disadvantages.
A recently developed supercharging system combines all the
advantages of the systems enclosed. The actual system setup opens up
more degrees of freedom to control and to reduce the
disadvantages. This implies new demands to the control structure for
reaching desirable system characteristics. A mean value model and a
simulation tool have been constructed and evaluated. The model has
been validated against the supercharging system and the developed
environment for the system. The most important point of view is to get
a good agreement compared to measured data for the system as a whole,
to be able to read general trends and levels for actual signals in the
system. For medium to high air flows with corresponding torque, the
agreement is good. For lower air flows and torques it is low. More
measurement needs to be done in order to get a better model and for a
deeper study of the results. A proposal is produced and discussed in
the thesis for the collection of data that is needed.
A complete vehicle simulation of an internal combustion engine
equipped with the supercharging system has been carried out and works
as a good start for further studies. It is shown that the actual
supercharging system gives more degrees of freedom to the system
development compared to traditional powertrains. Results that have an
important impact on fuel consumption and performance are
discussed. Based on the discussion an insight is gained for future
work in system development.
The outline gained from the engine model seems to be good and
usable as a technical aid for a rough modification of the actual
supercharged system. For a more careful examination more accurate
models are needed. A more careful validation is also needed for a
wider range of the combustion engine's working area.
The final configuration of the supercharged system is a future
challenge based on application demands. The developed models seem to
serve as a good starting point for this journey.
Jesper Turesson
2010
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Last updated: 2021-11-10
