The objective of the CRC E-91 study was to assess the long-term effects of E20 fuel exposure on vehicle evaporative emissions. Because evaporative emission system designs, materials, purge strategy controls, and on-board diagnostics vary widely, ten different vehicle models were chosen for study. The vehicle model years ranged from 2002 to 2010. For each vehicle model, two closely matched vehicles were recruited. One vehicle was aged on ethanol-free (RE0) fuel, and the other was aged on 20% ethanol splash-blended into ethanol-free gasoline (RE20) for approximately 18,650 miles. The vehicles in each pair were of the same engine family and evaporative emissions family, had the same ECM calibration software, and similar mileage in order to minimize any vehicle differences. The study was designed to discern the effects the fuels had on the evaporative emission system performance, permeability and durability. The vehicles were periodically tested to quantify fuel permeation and evaporative emissions as the vehicles aged. Data were collected to compare evaporative emissions to federal standards, to determine any differences between E0 and E20 fueled vehicles, and to isolate parameters for possible inclusion in future evaporative emissions and inventory models.
Evaporative Emissions Durability Testing
2012
119 pages
Report
Keine Angabe
Englisch
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