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Parallel- and series-configured hybrid vehicles likely feasible in next decade are defined and evaluated using NREL's flexible ADvanced VehIcle SimulatOR, ADVISOR. Fuel economies of these two diesel-powered hybrid vehicles are compared to a comparable-technology diesel-powered internal-combustion-engine vehicle. Sensitivities of these fuel economies to various vehicle and component parameters are determined and differences among them are explained. The fuel economy of the parallel hybrid defined here is 24% better than the internal-combustion-engine vehicle and 4% better than the series hybrid.

At the U.S. Department of Energy's National Renewable Energy Laboratory (NREL), one of the goals of the Center for Transportation Technologies and Systems is to develop innovative techniques for reducing automobile fuel usage and tailpipe emissions by decreasing the auxiliary loads on the propulsion system of advanced vehicles. The power required to cool the passenger compartment can significantly reduce the range of an electric vehicle (EV) and the fuel economy of a hybrid electric vehicle (HEV). We are investigating several ways to decrease auxiliary loads.