Performance analysis of a novel coaxial power-split hybrid powertrain using a CNG engine and supercapacitors

Minggao Ouyang, Weilin Zhang, Enhua Wang*, Fuyuan Yang, Jianqiu Li, Zhongyan Li, Ping Yu, Xiao Ye

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

Energy conservation is a very important task for the automotive industry. The use of hybrid electric vehicles can improve energy efficiency, thus reducing fuel consumption and carbon emissions. In this research, the performance characteristics of a novel coaxial power-split hybrid powertrain for a transit bus are presented. The power sources are a combination of a compressed natural gas (CNG) engine and supercapacitors. A mathematical model for the coaxial power-split hybrid powertrain is established. Subsequently, an analysis program is developed based on Matlab and Advisor. The parameters are specified using experimental data. Afterwards, a rule-based control strategy is designed and optimized from the viewpoint of energy efficiency. Later, the system performance is evaluated using the Chinese Transit Bus City Driving Cycle and compared to a conventional powertrain. The results indicate that the proposed coaxial power-split hybrid powertrain can fulfill the requirements of the transit bus and enhance the energy efficiency dramatically. Moreover, the average energy efficiency of the supercapacitors was found to be above 97% over the entire driving cycle. Using supercapacitors as energy storage devices for the coaxial power-split hybrid powertrain can effectively recover the kinetic energy during regenerative braking and is a good solution for transit buses that require frequent acceleration and deceleration.

Original languageEnglish
Pages (from-to)595-606
Number of pages12
JournalApplied Energy
Volume157
DOIs
Publication statusPublished - 1 Nov 2015
Externally publishedYes

Keywords

  • CNG engine
  • Coaxial power-split
  • Hybrid electric powertrain
  • Performance analysis
  • Supercapacitors

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Ouyang, M., Zhang, W., Wang, E., Yang, F., Li, J., Li, Z., Yu, P., & Ye, X. (2015). Performance analysis of a novel coaxial power-split hybrid powertrain using a CNG engine and supercapacitors. Applied Energy, 157, 595-606. https://doi.org/10.1016/j.apenergy.2014.12.086