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Turbo chargers are pertty much a no-brainer for diesels. I could see some sort of electric supercharger working for brief periods. I could also see it being used as a means of recovering energy during braking.
You take an engine running at decent rpms, cut the fuel, open the throttle wide and let the electric turbine windmill. Not sure how much energy it would recover, but, it could be something. I could also see where it might work as a throttle during steady state cruising. Once again, you open the throttle wide and use the turbine as a throttle by varying the regenerative drag. This was discussed a while ago. I couldn't see it having the response to work as the only throttle, but, perhaps in conjuction with a traditional throttle.
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