Effects of Test Conditions on Fuel Economy of Gasoline-Powered Vehicle

  • Seokjoo Kwon
  • Minkyung Kang
  • Youngho Seo
  • Sungwook Park


In this study, the influence on fuel economy testing of gasoline-powered vehicles is evaluated for various test conditions (e.g., laboratory temperature, soaking time, cooling fan, battery charge state, and driving mode tracking). It showed a difference in fuel economy results of approximately 3 % between low (88 %) and high (99 %) battery state of charge conditions because the alternator saving function has a positive effect on fuel economy. Fuel economy testing with laboratory temperature changes gave a slight reduction at 21 °C and slight increase at 29 °C. The cooling fan changes had an almost negligible effect on fuel consumption. The largest fuel economy result varied by 5.2 % in the soft, standard, and rough driving conditions.

Key Words

Fuel economy Battery SOC Cooling fan Soaking time Laboratory temperature 



absolute speed change rating, %


distance rating, %


energy economy rating, %


environmental protection agency in US


energy rating, %


EPA federal test procedure


EPA highway fuel economy test cycle


on-board diagnostic system


society of automotive engineers


state of charge, %


urban dynamometer driving schedule


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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Seokjoo Kwon
    • 1
  • Minkyung Kang
    • 2
  • Youngho Seo
    • 2
  • Sungwook Park
    • 3
  1. 1.Department of Mechanical Convergence EngineeringGraduate School of Hanyang UniversitySeoulKorea
  2. 2.Green Car Power System R&D DivisionKorea Automotive Technology InstituteChungnamKorea
  3. 3.School of Mechanical EngineeringHanyang UniversitySeoulKorea

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