Models that can be used to analyse the fuel saving potential of electrically driven auxiliaries in heavy vehicles are presented. With the purpose of evaluating the influence on fuel consumption from various concepts and control principals, a model library is developed in the modelling language Modelica. The library contains a mixture of models developed from physical principles and models fitted to collected data. Modelling of the cooling system is described in some detail. Energy consumers in the cooling system are primarily the cooling fan and the water pump. In heavy vehicles, these units normally are mechanically driven. The model corresponds the current design of a Scania truck where the water pump is directly driven from the crankshaft while the cooling fan is connected to the shaft via a viscous clutch enabling a passive speed control. The main parts of the cooling system are modelled, using the thermodynamic and hydraulic base classes. The identification procedure consists of building a model consisting of sub-models with physical interpretation and performing sequential identification of parameters. The cascaded identification allows for keeping the physical structure of the model while the total behaviour of the model can be tuned to give a good fit to measurement data. Simulation results are compared with measurement data from tests in a wind tunnel.
Simulating energy consumption of auxiliary units in heavy vehicles
Simulation des Energieverbrauchs von Hilfsgeräten in Schwerlastkraftwagen
2004
6 Seiten, 10 Bilder, 1 Tabelle, 4 Quellen
Conference paper
English
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