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Abstract |
Mean Value Models for Exhaust System Temperatures
SAE Technical Paper 2002-01-0374 Measurement and Control Laboratory, ETH Zürich, Switzerland and
Vehicular Systems, Linköping University, Sweden Exhaust temperatures are important for turbine and catalyst performance. A
set of exhaust temperature models suitable for turbo matching as well as
design and analysis of engine control systems are developed and
investigated. The models are lumped parameter heat transfer models, that
fall within the category of mean value engine models. The model is developed for describing exit temperatures from the exhaust
manifold and temperature drops in pipe sections in the exhaust system. The
components used to model the exhaust temperature are: engine out
temperature, temperature drop in a straight pipe, and a set of heat transfer
modes. The model is validated using data from three different engines. It is
shown that, for a spark ignited engine operating at MBT and stoichiometric
conditions, it is sufficient to model the engine out temperature as a linear
function of mass flow. Recommendations for tuning the model are also given. A thorough survey of exhaust heat transfer literature is also made together
with a comparative summary of the different heat transfer modes that are
present in the exhaust.
Lars Eriksson
SP-1702, 2002
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