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I never did understand the premise of an electrocharger type thing helping fe in a vehicle already equipped with an ICE large enough to provide the desired acceleration and cruise speeds. I can see it working if the ICE is undersized to the point where it needs help in providing the desire acceleration rate, and also help for grades and passing (if there is any).
My understanding of it is, ICE' are most efficient under accel- open throttle, low rpm- so if anything a hybrid strategy should have the ICE doing the accelerating work. It follows then that ICE' are least efficient under part throttle cruise so that is when you'd want to shut it down and use the electric which should dovetail nicely into that theory because batteries don't like the heavy draw-down of acceleration but seem to "like" the slower, steadier draw-down of cruise loads.
The good part is you now have the motor, controls, and batteries. If you aren't satisfied with the "electrocharger" type set-up, you can reconfigure for the "anti" electrocharger set-up. Sure it's back to the drawing board, more work but at least you have the expensive bits all lying about now.
The bad part is you need to figure out a way to get a true neutral coast i.e. freewheeling while in ev cruise mode.
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