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World Electric Vehicle Journal is published by MDPI from Volume 9 issue 1 (2018). Articles in this Issue were published by The World Electric Vehicle Association (WEVA) and its member the European Association for e-Mobility (AVERE), the Electric Drive Transportation Association (EDTA), and the Electric Vehicle Association of Asia Pacific (EVAAP). They are hosted by MDPI on mdpi.com as a courtesy and upon agreement with AVERE.
Open AccessArticle

Fuel Economy of Series Hybrid Electric Bus by Matching the Gear Ratio of Different Capacity Traction Motors

School of Mechanical and Aerospace Engineering, Seoul National University, Gwanak-Gu, Seoul, 151-744, Korea
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Author to whom correspondence should be addressed.
World Electr. Veh. J. 2012, 5(1), 254-260; https://doi.org/10.3390/wevj5010254
Published: 30 March 2012
PDF [1159 KB, uploaded 17 May 2018]

Abstract

This paper investigated the different gear ratio matching effect on the series hybrid electric bus especially for the 90 kW & 150kW traction motors on the fuel economy. The 90 kW & 150 kW traction motors make the system use more efficient operating points; thus, the system is more efficient than when the 240 kW single unit is used. Furthermore, matching the different gear ratios allows the nonlinear characteristics in the traction motor efficiency to be used more efficiently; thus the standard for how to select the gear ratios was proposed. The fuel economy selection was optimized by the hybrid optimization methodology using RSM and the univariate search method, both of which are well known for their straightforward concepts and adequate performances; thus, the new suggested matching theory noticeably improved the system efficiency. The work presented here has profound implications for future studies for the design of the hybrid electric vehicle, as well as the plug-in hybrid and the electric vehicles and was carried out on the AMEsim-Simulink Co-simulation platform.
Keywords: series hybrid electric vehicle; traction motor sizing; reduction gear ratio; hybrid optimization series hybrid electric vehicle; traction motor sizing; reduction gear ratio; hybrid optimization
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 (CC BY 4.0).
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Kim, M.; Jeung, D.; Min, K. Fuel Economy of Series Hybrid Electric Bus by Matching the Gear Ratio of Different Capacity Traction Motors. World Electr. Veh. J. 2012, 5, 254-260.

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