Modeling and Simulation of Vehicular Power Systems - webfiles its ...

8 Simulation ResultsIn this chapter first the battery model is verified and secondly the drive train of a serieshybrid bus is created based on the models previously explained. For simulation purposesthe test data from a series hybrid bus produced by New Flyer Company located in Canadais used. The performance of the bus in terms of acceleration, fuel economy is studied.8.1 Battery simulation resultsIn order to verify the battery model a 12 volt battery 46 A.h from Hawker Genesis wasused. The fully charged battery was discharged with constant 6 ampere current in ambienttemperature of 25 oC . An electronic load (model: Power Tek EL12-110M) was used todischarge and charge the battery with constant current. For charging, the battery wascharged with constant 30 ampere current. Once the terminal voltage reached to themaximum voltage given by the manufacturer [26], the voltage was kept constant until thebattery was fully charged. Figures 8-1 and 8-2 show the results out of the simulation andtests. It is observed that the model has a good accuracy. The error during charging couldbe because of the coulomb efficiency which has not been considered in the model.Figure 8-1 Battery charging test49