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Author: search.filters.author.Benyajati, Chi NaHas files: No

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    Battery sizing for electric vehicles based on real driving patterns in Thailand
    (2019-06-01)
    Duangsrikaew, Bongkotchaporn
    ;
    Mongkoltanatas, Jiravan
    ;
    Benyajati, Chi Na
    ;
    Karin, Preecha
    ;
    Hanamura, Katsunori
    The rising population in suburban areas have led to an increasing demand for commuter buses. Coupled with a desire to reduce pollution from the daily routine of traveling and transportation, electric vehicles have become more interesting as an alternative placement for internal combustion engine vehicles. However, in comparison to those conventional vehicles, electric vehicles have an issue of limited driving range. One of the main challenges in designing electric vehicles (EVs) is to estimate the size and power of energy storage system, i.e., battery pack, for any specific application. Reliable information on energy consumption of vehicle of interest is therefore necessary for a successful EV implementation in terms of both performance and cost. However, energy consumption usually depends on several factors such as traffic conditions, driving cycle, velocities, road topology, etc. This paper presents an energy consumption analysis of electric vehicle in three different route types i.e., closed-area, inter-city, and local feeder operated by campus tram and shuttle bus. The driving data of NGV campus trams operating in a university located in suburban Bangkok and that of shuttle buses operating between local areas and en route to the city were collected and the corresponding representative driving cycles for each route were generated. The purpose of this study was to carry out a battery sizing based on the fulfilment of power requirements from the representative real driving pattern in Thailand. The real driving cycle data i.e., velocity and vehicle global position were collected through a GPS-based piece of equipment, VBOX. Three campus driving data types were gathered to achieve a suitable dimensioning of battery systems for electrified university public buses.
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    A Feasibility Study on Effect of Battery and Driving Conditions on Performance of an Electric Bus
    (2015-03-30)
    Premvaranon, Piyapong
    ;
    Soparat, Jenwit
    ;
    Teralapsuwan, Apichart
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    Sritham, Wuttipong
    ;
    Benyajati, Chi Na
    Due to recent oil price crisis and an ever-increasing public awareness on environmental issues, an interest in electric vehicles (EV) has increased tremendously in Thailand and other Asian countries over the last few years. In this study, a prototype of 9-metre battery electric vehicle (BEV) bus was chosen as a vehicle of interest to undergo a series of field test by operating the lead acid battery powered electric bus in order to estimate a power demand of the bus as well as to evaluate a battery performance characteristic Two different types of battery were employed in this study i.e. a flooded-type deep cycle lead acid battery and a valve regulated lead acid (VRLA) battery. The effect of different driving modes available from the drive motor i.e. normal, max power, max range, as well as regenerative braking feature would be investigated while an influence of drivers were also taken into account to ensure the repeatability of the obtained results. According to the field test results, the different electrical characteristics of each battery type and driving conditions directly affected the performance of the electric bus in aspect of power demand, range per charge. Moreover, the regenerative braking feature was found to improve the overall operating distance of the bus as well as providing an extra deceleration over the mechanical brakes. The results from this study would then be used to determine the most appropriated driving parameters, including charging routines, for application of the EV bus as an university campus fleet in the next phase of the ongoing project.