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Comparison of real-world fuel economy and emissions from parallel hybrid and conventional diesel buses fitted with selective catalytic reduction systems

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  • Guo, Jiadong
  • Ge, Yunshan
  • Hao, Lijun
  • Tan, Jianwei
  • Peng, Zihang
  • Zhang, Chuanzhen

Abstract

In this research, two parallel hybrid- and two diesel-buses fitted with selective catalytic reduction systems were tested in real world conditions using portable emission measurement systems. The hybrid buses were chosen to operate in either hybrid mode or diesel mode. In hybrid mode, the buses consumed less fuel, but the brake specific fuel consumptions were higher. The hybrid buses produced less engine-out NOX emissions than diesel buses, but as a result of lower exhaust temperature and lower efficiencies of SCR systems, the tailpipe NOX emissions from hybrid buses were a little higher. The brake specific NOX emissions from hybrid buses were very high and beyond the limit value of Euro-IV standard. History effect was also important for the efficiency of SCR system. The CO emissions from hybrid buses were lower in the unit of g/s, but the fuel-based CO emissions were higher than diesel buses.

Suggested Citation

  • Guo, Jiadong & Ge, Yunshan & Hao, Lijun & Tan, Jianwei & Peng, Zihang & Zhang, Chuanzhen, 2015. "Comparison of real-world fuel economy and emissions from parallel hybrid and conventional diesel buses fitted with selective catalytic reduction systems," Applied Energy, Elsevier, vol. 159(C), pages 433-441.
    • Handle: RePEc:eee:appene:v:159:y:2015:i:c:p:433-441
    DOI: 10.1016/j.apenergy.2015.09.007
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    Cited by:

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    3. Nikiforos Zacharof & Evangelos Bitsanis & Stijn Broekaert & Georgios Fontaras, 2024. "Reducing CO 2 Emissions of Hybrid Heavy-Duty Trucks and Buses: Paving the Transition to Low-Carbon Transport," Energies, MDPI, vol. 17(2), pages 1-26, January.
    4. Christos Keramydas & Georgios Papadopoulos & Leonidas Ntziachristos & Ting-Shek Lo & Kwok-Lam Ng & Hok-Lai Anson Wong & Carol Ka-Lok Wong, 2018. "Real-World Measurement of Hybrid Buses’ Fuel Consumption and Pollutant Emissions in a Metropolitan Urban Road Network," Energies, MDPI, vol. 11(10), pages 1-16, September.
    5. Rosero, Fredy & Fonseca, Natalia & López, José-María & Casanova, Jesús, 2020. "Real-world fuel efficiency and emissions from an urban diesel bus engine under transient operating conditions," Applied Energy, Elsevier, vol. 261(C).
    6. Zhu, Dengting & Zheng, Xinqian, 2018. "A new asymmetric twin-scroll turbine with two wastegates for energy improvements in diesel engines," Applied Energy, Elsevier, vol. 223(C), pages 263-272.
    7. Lv, Zongyan & Wu, Lin & Yang, Zhiwen & Yang, Lei & Fang, Tiange & Mao, Hongjun, 2023. "Comparison on real-world driving emission characteristics of CNG, LNG and Hybrid-CNG buses," Energy, Elsevier, vol. 262(PB).
    8. Zhao, Jinxing, 2017. "Research and application of over-expansion cycle (Atkinson and Miller) engines – A review," Applied Energy, Elsevier, vol. 185(P1), pages 300-319.
    9. García, Antonio & Monsalve-Serrano, Javier & Martinez-Boggio, Santiago & Zhao, Wenbin & Qian, Yong, 2022. "Intelligent charge compression ignition combustion for range extender medium duty applications," Renewable Energy, Elsevier, vol. 187(C), pages 671-687.

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