An Electrification Solution For Istanbul Metrobus Line
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Tarih
2019-07-04Yazar
Tanyeri, Mustafa Nicem
Ambargo Süresi
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In the present case, Istanbul Metrobus Line is operated by Metrobus vehicle with internal
combustion engines. This situation is not suitable and sustainable in terms of operating cost
and environment pollution. If this line was operated with electric vehicles, it would have
lower operation costs and would reduce harmful effects to the environment. As an
alternative solution, in this thesis, economically and technically the most suitable electric
vehicle solution is determined according to the requirement obtained by driving cycle,
environmental conditions, passenger occupancy rates and characteristic of the vehicle.
In July 2018, in order to determine the characteristic of the vehicle, a coast down test was
performed with an 18 meter articulated Metrobus. Additionally, to create the driving cycle;
position, velocity, acceleration and time data were acquired from a Metrobus in service
with IMU and GPS. Passenger flow data were generated from data that were obtained from
the bus operator company. So as to find out HVAC system requirement of the Metrobus,
weather data of Istanbul is obtained from Turkish State Meteorological Service and with
the solar position data calculated heat loads of the vehicle were determined according to
ASHRAE Standard. According these data, all system requirements are obtained.
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First of all, according to power requirements of the 18-m articulated bus, the traction
system is selected and a suitable gearbox ratio for that traction system is determined to
fulfill the system requirements. Secondly, the most important sub-system for passenger
comfort, HVAC, is selected in compliance with the weather data. Thirdly, charger and
batteries of different chemistry are selected for different lines. Finally, two types of fleets
with different charging strategies are designed.
At the end of the study, fleets that have different batteries and different charging strategies
are compared with each other and with current diesel Metrobus fleet. For the comparison
cost of all components are obtained and total cost of ownership of these three fleets are
calculated. The most suitable electrification solution is obtained according to these
calculations.