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I was pondering just now and had a neat idea, want to run it past everyone :-)
I want to do a serial hybrid, mainly for the ability to keep the diesel drive engine in its bsfc "sweet spot" but recently to engage what Ill call FVT style driving. (The FVT Ale car, I was reading a few posts about it and they employ a strategy of driving the car under power from the ICE and charging the batteries, then shutting down the ICE and running under battery power. I likee! :-)
Anyway, here is what I was thinking. As serial hybrid, a portion of the ICE's output would be for running through the batteries and right back out the controller toward the drive motor, the inneficiencies do add up.
Also, for a highway speed capable vehicle, I have a feeling 72v will be "almost good enough" for speeds of 70 or 75.
(Sure would be nice to keep it at 72v though, Alltrax controller, cheaper chargers, less batts etc)
So, if a portion would be for motive power and a portion would be for charging. perhaps I go series AND parallel hybrid...
Building this would be easier then it sounds, I think. I could have a centrifigual clutch on the diesel with 2 sprockets coming off of it, one to the drive motor to 'push it" at high way speeds and 1 running to a much smaller gen motor to output say 86v (to charge a 24 cell lifepo pack) x 20a
Unless I am missing something, here would be the pluses and minuses:
Pluses:
Motive diesel power would get transferred to the drive wheel with only the chains resistance.
It would help the electric drive motor where it needs it most, highway high speed droning.
It would still be able to charge the main pack.
Minuses:
The diesel would be spending some of its time not smack dab in the middle of the bsfc sweet spot (But not too much it would be pretty constant at 70mph)
Comments? :-)
Thanks
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