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This paper deals with the superb hybrid-electric vehicle to be put to use as a super-low-floor city bus - a highly efficient vehicle which can offer both excellent fuel economy and low emissions of exhaust gas. In order that oil resources may be put to more effective use, the research and development activities described herein aimed at realizing a vehicle with lower energy consumption, higher efficiency, lower fuel consumption, and also cleaner exhaust gasses than those of diesel-engine busses which are traditionally used in urban environments. A series-type implementation was adopted for the hybrid electrical-drive system in order that a higher degree of energy efficiency could be achieved. Furthermore, the newly-developed high-performance lithium ion batteries were adopted for use in this vehicle.