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Title: Comparison of Parallel and Series Hybrid Power Trains for Transit Bus Applications

Abstract

The fuel economy and emissions of conventional and hybrid buses equipped with emissions after treatment were evaluated via computational simulation for six representative city bus drive cycles. Both series and parallel configurations for the hybrid case were studied. The simulation results indicated that series hybrid buses have the greatest overall advantage in fuel economy. The series and parallel hybrid buses were predicted to produce similar carbon monoxide and hydrocarbon tailpipe emissions but were also predicted to have reduced tailpipe emissions of nitrogen oxides compared with the conventional bus in higher speed cycles. For the New York bus cycle, which has the lowest average speed among the cycles evaluated, the series bus tailpipe emissions were somewhat higher than they were for the conventional bus; the parallel hybrid bus had significantly lower tailpipe emissions. All three bus power trains were found to require periodic active diesel particulate filter regeneration to maintain control of particulate matter. Finally, plug-in operation of series hybrid buses appears to offer significant fuel economy benefits and is easily employed because of the relatively large battery capacity that is typical of the series hybrid configuration.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Transportation Research Center (NTRC)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Transportation Research Center (NTRC)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1319203
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Transportation Research Record
Additional Journal Information:
Journal Volume: 2570; Journal ID: ISSN 0361-1981
Publisher:
National Academy of Sciences, Engineering and Medicine
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 33 ADVANCED PROPULSION SYSTEMS

Citation Formats

Gao, Zhiming, Daw, C. Stuart, Smith, David E., LaClair, Tim J., Parks, James E., and Jones, Perry T. Comparison of Parallel and Series Hybrid Power Trains for Transit Bus Applications. United States: N. p., 2016. Web. doi:10.3141/2570-11.
Gao, Zhiming, Daw, C. Stuart, Smith, David E., LaClair, Tim J., Parks, James E., & Jones, Perry T. Comparison of Parallel and Series Hybrid Power Trains for Transit Bus Applications. United States. doi:10.3141/2570-11.
Gao, Zhiming, Daw, C. Stuart, Smith, David E., LaClair, Tim J., Parks, James E., and Jones, Perry T. Mon . "Comparison of Parallel and Series Hybrid Power Trains for Transit Bus Applications". United States. doi:10.3141/2570-11. https://www.osti.gov/servlets/purl/1319203.
@article{osti_1319203,
title = {Comparison of Parallel and Series Hybrid Power Trains for Transit Bus Applications},
author = {Gao, Zhiming and Daw, C. Stuart and Smith, David E. and LaClair, Tim J. and Parks, James E. and Jones, Perry T.},
abstractNote = {The fuel economy and emissions of conventional and hybrid buses equipped with emissions after treatment were evaluated via computational simulation for six representative city bus drive cycles. Both series and parallel configurations for the hybrid case were studied. The simulation results indicated that series hybrid buses have the greatest overall advantage in fuel economy. The series and parallel hybrid buses were predicted to produce similar carbon monoxide and hydrocarbon tailpipe emissions but were also predicted to have reduced tailpipe emissions of nitrogen oxides compared with the conventional bus in higher speed cycles. For the New York bus cycle, which has the lowest average speed among the cycles evaluated, the series bus tailpipe emissions were somewhat higher than they were for the conventional bus; the parallel hybrid bus had significantly lower tailpipe emissions. All three bus power trains were found to require periodic active diesel particulate filter regeneration to maintain control of particulate matter. Finally, plug-in operation of series hybrid buses appears to offer significant fuel economy benefits and is easily employed because of the relatively large battery capacity that is typical of the series hybrid configuration.},
doi = {10.3141/2570-11},
journal = {Transportation Research Record},
number = ,
volume = 2570,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2016},
month = {Mon Aug 01 00:00:00 EDT 2016}
}

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Cited by: 2 works
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