Electrification of the public transport sector has a high potential to reduce emissions, especially in metropolitan areas. Due to its strictly scheduled routes and regular idle times, the public transport sector is ideal for the use of battery electric vehicles (BEV). The energy efficiency of a BEV can be increased by the implementation of a thermal management system that is able to decrease the overall energy demand of the system. The thermal management of an electric city bus controls the thermal behavior of the components of the powertrain, such as motor and inverters (drive and auxiliary), as well as the conditioning of the battery system. Moreover, the heating, ventilation, and air conditioning (HVAC) of the drivers’ front box and the passenger room plays an important role for the energy demand.
In this research, the thermal behavior of the important components of an electric city bus is modelled in MATLAB/Simscape in co-simulation with Dymola under the influence of defined driving cycles. The heating of the components, geometry and behavior of the cooling circuits as well as the different mechanisms of heat transfer are modelled close to the real system. Moreover, a test setup is developed for the validation of the simulation results. Results are presented, which show that the thermal behavior can be modelled with high accuracy to the real system. Moreover, potentials to reduce the overall energy demand by improving the thermal energy flows are identified.
Session:
Thermal Systems
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| 13:30 - 14:00