A model of the temperatures in a truck cabin
Temperature variations in a truck cabin are rather slow and therefore
timeconsuming to measure. Because of Scania’s great number of truck
cabin models, much work, time and money is saved if a mathematical
model can predict how the temperature characteristics of the cabins
change with different sizes and materials. A model has been
implemented in Matlab/Simulink. The model has a flexible structure and
is rather detailed to make it adaptable to different cabin designs
regarding materials and sizes. The output of the model is the cabin’s
global air temperature. In addition to that there are a large number
of temperatures and heat flows that can be displayed. The inputs to
the model are the temperature and amount of air provided by the fan,
the outdoor temperature, the heat and sun radiation incident on the
cabin, the wind speed relative to the truck and the mass flow between
the cabin air and the outdoor air caused by diffusion. The model can
give a good view of how a real system would behave and is useful for
e.g temperature regulator design and heat loss investigations. The
model behaves like expected from a physical point of view. However the
model’s simulation results do not correlate with the measurements as
good as desired. The cause of this is likely that the measuments are
incorrect. Futher verifications are needed with more accurate
measurements.
Johan Andersson
1999
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Last updated: 2021-11-10
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