2013 CRC Intermediate-Temperature E15 Cold-Start and Warm-Up Vehicle Driveability Program

An intermediate-temperature test program was conducted by the Coordinating Research Council (CRC) in response to a request from ASTM to determine the effect of higher ethanol contents on cold-start and warm-up driveability performance under cool ambient conditions in a group of high U.S. sales volume, late model vehicles that were measured to be responsive to high Driveability Index (DI) fuels. The test program was conducted from February 4, 2013, through March 22, 2013, in Yakima, Washington. The program involved testing ten fuels: a high DI (1250) hydrocarbon base fuel with a nominal 8 psi vapor pressure, three splash blended fuels (10, 15, and 20 volume percent ethanol), three hydrocarbon only fuels with DIs matched to the splash blended fuels, and three fuels containing 10, 15, and 20 percent ethanol with DI matched to the splash blended 20 volume percent ethanol blend. The program determined that for fuels containing up to 10 volume percent ethanol the current ASTM D4814 Driveability Index (DI) equation fit the data with a correlation coefficient, R2, of 0.906. The program determined that for fuels containing ethanol concentrations at 15 or 20 volume percent the current DI equation fit the data with correlation coefficients, R2, 0.557 and 0.538 respectively for the fleet of vehicles tested. A new DI coefficient for ethanol was determined for fuels containing 0 to 20 volume percent ethanol. This new coefficient fit the 0 to 20 volume percent ethanol data with a correlation coefficient, R2, of 0.886. Vehicle design characteristics were also evaluated in this study, some of which were found to have statistically significant effects on driveability. An ancillary program was conducted to evaluate the AVL-DRIVE™ System for automated driveability ratings. Results will be included in a separate CRC report.


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Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 81p

Subject/Index Terms

Filing Info

  • Accession Number: 01535772
  • Record Type: Publication
  • Report/Paper Numbers: CRC Report No. 666
  • Contract Numbers: CRC Project No. CM-138-11-3
  • Files: TRIS
  • Created Date: Jun 23 2014 11:25AM