Powertrain design alternatives for electric city bus

  • Lajunen A
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The objective of this paper is to analyze the performance
characteristics of different powertrain design alternatives in electric
city bus. These powertrain alternatives are generated with different
configurations of energy storage system, traction motor and
transmission. Ultracapacitors and lithium based batteries are used as
energy storages and induction and permanent magnet electric motors as
traction motors. Simulations were performed in four different city bus
driving cycles. Specific simulations were carried out for investigating
the impact of the weight and auxiliary power on the energy consumption.
The simulation results indicate that the powertrain efficiency and high
potential for regenerating braking energy have significant impact on
overall energy efficiency of the electric city bus. It was also observed
that the most of the powertrain alternatives are well adapted for all
simulated driving cycles. The driving cycle mainly impacts on the
potential for regenerating the braking energy. The simulation results
also show that higher auxiliary power consumption has much more
influence on the overall energy consumption than increased weight of the

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