Sorry, but this idea simply isn't going to work well for a road vehicle. The power has to be modulated somewhere, and you're bringing it right back to the engine where it would be in a normal car. So, you can't run the engine at peak BSFC (unless you add a battery pack). You've now eliminated the only benefit a series hybrid really has. You still have all the negative sides of it. Also, since you're eliminating the gearing, you're also going to require incredibly massive electric motors to handle the torque that you'll need for reasonable acceleration.
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