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GM and U Mich receive patent on plug-in series hybrid/extended range electric vehicle powertrain using multiple free piston linear alternator engines

Green Car Congress

The powertrain system—the patent application for which was filed in 2009—includes an electrical energy storage system—such as a Li-ion battery pack—and an electric traction motor. Fuels can include gasoline blends, and alcohol blended hydrocarbon fuel grades. E80, E85), and neat ethanol (E99).