This SAE Information Report establishes a set of “Utility Factor” (UF) curves and the method for generating these curves. The UF is used when combining test results from battery charge-depleting and charge-sustaining modes of a Plug-in Hybrid Electric Vehicle (PHEV). Although any transportation survey data set can be used, this document will define the included UF curves by using the 2001 United States Department of Transportation (DOT) “National Household Travel Survey” and a supplementary dataset.Describing the fuel and electrical energy usage of plug-in hybrid electric vehicles (PHEVs) is very challenging for the reason that these values vary greatly depending upon the distance traveled between charging. Detailed test procedures recommended for PHEVs are found within SAE J1711, this document serves to supply appropriate UF curves for the equations in that document that weigh the charge depleting mode operation with the charge-sustaining operation depending upon the charge-depleting mode distance measured from the test. The original issue of SAE J2841 introduced the Utility Factor based upon a mileage-based “Fleet” analysis of the US DOT National Household Transportation Survey data. This issue of SAE J2841 adds more options to the Utility Factor calculations by analyzing another data set from a Georgia Tech called the “Commute Atlanta” in order to find a vehicle-weighted analysis.
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