A technique has been developed for deriving the optimal operating strategy including engine calibration for a hybrid vehicle given the vehicle hardware description, the operating cycle, emission constraints, and the relative costs of the two energy sources carried on the vehicle. This report describes the technique and presents the results of applying it to a set of electric/ice hybrid vehicles which attempt to encompass a very wide range of powertrain choices for a 2000 lb base vehicle. Results are presented for city driving where the battery is required to end the cycle at the same state of charge as at the beginning, as well as a 100-mile mission over which it was possible to fully discharge the battery at no cost. The study indicates, for the assumptions and constraints of this particular study, the powertrain combinations which have the highest potential both for liquid fuel and for combined energy saving. (A)
Samenvatting