Hmm i always thought the other way round..
You have the usual internal combustion engine like the Otto one, and you have a much bigger battery, but not as big as like with the entirely electric cars like Tesla or Ampera.
You start the internal combustion engine by producing hydrogen out of water, with the battery's energy, until the engine runs. Then it automatically switches to the generator's energy being driven by the engine, to split hydrogen and oxygen from water.
You can then either drive your car with a conventional engine fuelled by hydrogen (all combustion engines can use mineral fuels, hydrogen, ethanol or anything that explodes without changing much of the layout), or you can entirely disconnect the engine from the drive train, and just produce electricity to power an electric engine that moves teh car, like with Diesel-electric propulsion, only that it is hydrogen instead of Diesel. All without emissions else than water vapour.
"Problem" is you would not need to buy fuel anymore... or only demineralized water. I can see some companies won't like that..
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>^..^<*)))>{ All generalizations are wrong.
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