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Here is the main problem:
You are using an inefficient gas/diesel engines to:
1) Produce mechanical motion
2) that then gets converted to electricity
3) to then convert back to mechanical motion via a motor
You are just adding loses to the system to the system. The current hybrid systems do not get an increase in fuel efficiency because it can use the electric motor to propel itself (it helps but it isn't the big gain). The big gain is the driving technics most of us emplor ans get hybrid like gas mileage.
This system COULD produce a gain in fuel efficiency it pared with a regen system and home charging system. Basically all it is providing is the cheap portion of a OEM hybrid system and leaving the energy storage system up to the the buyer, which is the expensive part.
This design is no more than half the system needed to net a gain in fuel efficiency. Without the rest of the system you cannot get a net gain. You will lose MPG with this system unless you actually somehow impliment an on/off switch that turns the system on while you are accelerating(lots of gain to be made) and off when at cruising speed(no gain to be made). Then you need to have a large battery system that is charged after use so that you can suppliment the gas energy supply with an electrical energy supply. But the system would have to be seperate from the alternator so that the alternator is not trying to charge the systems battery.
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