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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 972139, 12 pages
Research Article

Energy Flow Chart-Based Energy Efficiency Analysis of a Range-Extended Electric Bus

College of Electrical and Electronic Engineering, Harbin University of Science and Technology, Xue Fu Road 52, Harbin 150080, China

Received 13 December 2013; Accepted 29 January 2014; Published 9 March 2014

Academic Editor: Hamid R. Karimi

Copyright © 2014 Xiaogang Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper puts forward an energy flow chart analysis method for a range-extended electric bus. This method uses dissipation and cycle energy, recycle efficiency, and fuel-traction efficiency as evaluation indexes. In powertrain energy efficiency analysis, the range-extended electric bus is developed by Tsinghua University, the driving cycle based on that of Harbin, a northern Chinese city. The CD-CS and blended methods are applied in energy management strategies. Analysis results show with average daily range of 200 km, auxiliary power of 10 kW, CD-CS strategy, recycle ability and fuel-traction efficiency are higher. The input-recycled efficiency using the blended strategy is 24.73% higher than CD-CS strategy, while the output-recycled efficiency when using the blended strategy is 7.83% lower than CD-CS strategy.