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Charlie, current diesel hybrid powertrains are really somewhere in between serial and parallel, just like the Toyota hybrid drivetrain in cars. The diesel and electric motors are connected by a planetary gearset that allows the powertrain controller to vary their contributions as it sees fit. From a stop, the electric is doing almost all the work. As speeds go up, the diesel provides more, until at highway speeds the diesel is the main contributor. This saves a great deal of wear on the diesel (from full-throttle starts) and some fuel.

by dal20402 on Feb 28, 2012 2:05 pm • link • report

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