Modular-based modeling of electric vehicle thermal management system: Modular system implementation in Simulink
Typ
Examensarbete för masterexamen
Program
Applied mechanics (MPAME), MSc
Publicerad
2021
Författare
Heydarnezhad Karimi, Babak
Wirsén, Noah
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
There are many advantages coupled to the transition from conventional internal
combustion engines (ICEs) to battery electric vehicles (BEVs). From an environmental
standpoint, BEVs are generally associated with less emissions, resulting in
cleaner air in cities and lower contribution to climate change. To replace the ICEs,
the energy efficiency of a BEV needs to be maximized. If that regard, an optimized
thermal management system plays a vital role.
Thermal management system ensures not only higher energy efficiency but also
longer range, increased lifespan of the internal components, reduced running cost,
etc. This project aims to develop a novel modeling methodology for the BEV thermal
management from the system perspective. The goal was to perform simulations
at low computational costs while capturing the relevant physics of the system with
good accuracy. The work comprised several steps: become familiar with the existing
thermal management system, collecting data from simulations, experiment
and supplier, processing data in the form of regression, model the data in a system
format for different boundary conditions and finally validate the system for different
driving scenarios and ambient conditions. In this methodology, three physical
properties are considered: mass flow rate and pressure to validate the system from
a fluid perspective; and temperature to consider the thermal aspect.
A component-based modeling approach was employed making it possible to capture
the behaviour of the individual components and their interactions. The approach
is very robust since once the components properties are mapped, the model can be
used in multiple thermal management layouts.
The developed model was successfully validated from the flow perspective with the
pump component having the biggest impact in the model performance. The pumps
were modeled with high accuracy within 5 % error margin, and the system produced
accurate results for mass flow rate, temperature and pressure. The thermal validation
was performed for different driving scenarios such as highway, city driving and
WLTC. The system followed similar trends in the mass flow rate, temperature difference
and pressure drop over each component compared to GT-SUITE simulations.
The model has great potential to serve as a virtual test bench for different design
concepts. The usage of the model will substantially reduce the simulation time and
efficient optimization procedures, during both physical and virtual testing.
Beskrivning
Ämne/nyckelord
BEV , Simulink , GT-SUITE , Thermal management system , Driving cycle , Cooling system , Modular approach