Abstract
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 language | English |
|---|---|
| Publication status | Published - 2016 |
| Event | 36th FISITA World Automotive Congress, 2016 - Busan, Korea, Republic of Duration: 2016 Sept 26 → 2016 Sept 30 |
Other
| Other | 36th FISITA World Automotive Congress, 2016 |
|---|---|
| Country/Territory | Korea, Republic of |
| City | Busan |
| Period | 16/9/26 → 16/9/30 |
Keywords
- Coastdown test
- Energy balance
- Evaluation criteria
- Fuel economy
- Road load
ASJC Scopus subject areas
- Automotive Engineering
- Safety, Risk, Reliability and Quality