A study on validation procedure for vehicle road load with energy balance method

Charyung Kim, Hyunwoo Lee, Yongsung Park, Cha Lee Myung, Simsoo Park

Research output: Contribution to conferencePaperpeer-review


For the vehicle fuel economy test using a chassis dynamometer, road load force that occurs during drive on a real-world road must be simulated on the dynamometer. Currently, road load is measured and provided by the auto maker. However there is no method available for a third party to validate such road load. In this study, various methods were explored to validate road load, including individual energy differences or combined energy differences depending on the fuel economy test mode and differences in road load force in consideration of the speed range for on-board coast down, etc. For the analysis of each method, author-defined road load has been used. Then the result from the calculation was compared with energy difference obtained using a different method. For the same road load settings, comparison of individual fuel economy test mode reveals that there are energy differences of 14.9 % in the FTP-75 mode, 10.6 % in HWFET mode and 12.6 % in combined fuel economy test mode, respectively. This suggests that energy difference may vary depending on the calculation method used for road load validation.

Original languageEnglish
Publication statusPublished - 2016
Event36th FISITA World Automotive Congress, 2016 - Busan, Korea, Republic of
Duration: 2016 Sept 262016 Sept 30


Other36th FISITA World Automotive Congress, 2016
Country/TerritoryKorea, Republic of

Bibliographical note

Publisher Copyright:
© 2016, FISITA. All rights reserved.

Copyright 2019 Elsevier B.V., All rights reserved.


  • Coastdown test
  • Energy balance
  • Evaluation criteria
  • Fuel economy
  • Road load

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality


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