Conference article

Variable Structure Modeling for Vehicle Refrigeration Applications

Imke Krüger
Hamburg University of Technology, Department of Technical Thermodynamics, Hamburg, Germany/TU Berlin, Department of Software Engineering and Theoretical Computer Science, Berlin, Germany

Alexandra Mehlhase
Hamburg University of Technology, Department of Technical Thermodynamics, Hamburg, Germany/TU Berlin, Department of Software Engineering and Theoretical Computer Science, Berlin, Germany

Gerhard Schmitz
Hamburg University of Technology, Department of Technical Thermodynamics, Hamburg, Germany/TU Berlin, Department of Software Engineering and Theoretical Computer Science, Berlin, Germany

Download articlehttp://dx.doi.org/10.3384/ecp12076927

Published in: Proceedings of the 9th International MODELICA Conference; September 3-5; 2012; Munich; Germany

Linköping Electronic Conference Proceedings 76:96, s. 927-934

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Published: 2012-11-19

ISBN: 978-91-7519-826-2

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

A variable-structure approach for Modelica models is presented in this paper. Variable structure models enable the user to change the simulation model during runtime. This is not supported by common simulation environments and thus a Matlab script is used to control the run of the simulation. The script switches between the different models and sets the initial values to ensure smooth transients of the variables. The method is applied to a model of a thermal management system for Lithium ion batteries in a hybrid vehicle. In this model some components don not need to be calculated through the complete simulation time and are removed from the model through the variable-structure approach. With this approach the simulation time can be reduces while the simulation accuracy is not affected negatively

Keywords

li-ion batteries; compression cycle; simulation speed; thermal management; variable-structure model

References

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[3] Zimmer D. Equation-Based Modeling of Variable-Structure Systems. Ph.D. thesis; Swiss Federal Institute of Technology; 2010.

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[5] Nilsson; H.; Giorgidze; G. (2010). Exploiting structural dynamism in Functional Hybrid Modelling for simulation of ideal diodes. In: Proceedings of the 7th EUROSIM Congress on Modelling and Simulation. Czech Technical University Publishing House; Prague; Czech Republic; 2010.

[6] Tummescheid; H.; Eborn; J.; Prölß; K.; AirConditioning - a Modelica library for dynamic simulation of AC systems; In: G. Schmitz (ed.); Proceedings of the 4th International Modelica Conference; Hamburg; March 7-8; 2005. vol. 1; p. 185-192.

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