System-level simulations of the effects of driving cycles and driver behavior on the energy flow in a battery electric vehicle
Ladda ner
Publicerad
Författare
Typ
Examensarbete för masterexamen
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Fully-electric car technology has made enormous progress in recent years. With
driving range as one of the key factors for commercial success and the vast variety
of real-world driving behaviour, the question arises how different levels of driving aggressiveness
and drive cycles influence the energy flow in a Battery Electric Vehicle
(BEV). Vehicle-level simulations in Siemens Simcenter Amesim were carried out to
assess the energy flow in the BEV. Both standard drive cycles and real-world drive
patterns represented city, rural and highway driving were considered. The driving
aggressiveness was modelled by considering velocity modified and acceleration
modified drive patterns separately. The simulation results show that drive cycles
with high RPA and relatively low average velocity (20-30 km/h) have the lowest energy
consumption due to the ability of BEVs to recuperate energy from regenerative
braking and their high average efficiency at these velocities. Thus, BEVs are more
sensitive to changes in velocities than in accelerations. High accelerations not only
increase the inertia work share of the drive cycle, but also the amount of energy
recuperated by regenerative braking. Higher velocities, however, only increase the
road work part of wheel work leading to increase in energy demand without the
possibility to recover it through regenerative braking. Although questions such as
the exact impact of road slopes on energy consumption remain open to further investigation,
it can be stated that BEVs are particularly suitable for city traffic with
its frequent braking events and relatively low average velocities.
Beskrivning
Ämne/nyckelord
BEV, Drive Cycle, Energy Flow, Simulation, Driving Aggressiveness, Driving Behavior