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Your idea would be more like half car, half EV, not so much a hybrid. A few points to consider...
1. When the motor is assisting the ICE, it's pushing it down into a less efficient part of the BSFC map. You'll be getting considerably less power from the ICE, but it will only be using a little less fuel.
2. Selectively switching battery banks to get different voltages will discharge them at different rates, and has the potential to even reverse charge them!
I would rather see a well-engineered design than you blowing money and time only to half-ass it and give up after disappointing results.
Remember the Accord Hybrid. Same V6 as the regular Accord (not to mention millions in R&D), just with motors added. Economy was worse than the 4cyl version.
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