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A novel VSP-based CO2 emission model for ICEs and HEVs based on internally observable variables: Engine operating speeds

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  • Chen, Jianan
  • Wang, Kun
  • Yu, Hao
  • Chen, Hao
  • Zhao, Feiyang
  • Yu, Wenbin

Abstract

The driving characteristics and engine operating characteristics on vehicle carbon dioxide (CO2) emissions of different types of vehicles are explored in this study. For Internal Combustion Engine Vehicles (ICEVs), vehicle specific power (VSP) is the parameter with the highest correlation coefficient with CO2 emission rate, while for Hybrid Electric Vehicles (HEVs), it becomes engine speed. Due to the compound drive of fossil-fueled internal combustion engines and electric motors, the CO2 emission rates of HEVs is no longer positive correlated with velocity-related vehicle dynamics presented by traditional VSP binning method. Therefore, a novel binary VSP binning model coupled with engine speed maps (VSP + M) is proposed to link the tailpipe emissions to vehicle activities and engine operating parameters. After well-designed configurations on the number of map divisions m and the number of elements into a tile z, the VSP + M model is able to achieve higher prediction accuracy along with better data usage. For HEVs, the prediction accuracy represented by R2 is observed over three-fold increase beyond 0.9, which embodies great value of binary model integrated with both externally observable variable (EOV) and internally observable variable (IOV) parameters in essence of the actual road traffic scenarios undergoing large-scale electrification.

Suggested Citation

  • Chen, Jianan & Wang, Kun & Yu, Hao & Chen, Hao & Zhao, Feiyang & Yu, Wenbin, 2024. "A novel VSP-based CO2 emission model for ICEs and HEVs based on internally observable variables: Engine operating speeds," Energy, Elsevier, vol. 313(C).
    • Handle: RePEc:eee:energy:v:313:y:2024:i:c:s0360544224036703
    DOI: 10.1016/j.energy.2024.133892
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    References listed on IDEAS

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