I would tend to agree with you. There was a discussion a while back (a
year?) about how much regen gives back. I think the number, for my kind
of driving, was around 5% - for a pure EV. In your case, since the
electric motor will be used primarily for acceleration - both from a
stop and up inclines - you may find that the amount of time spent in
regen versus accel approaches 50-50. That might give you a payback of
30-40%. Just a bunch of guesses, so if you care, do some math :)
Peri
------ Original Message ------
From: "Ben Goren via EV" <[email protected]>
To: "Robert Bruninga" <[email protected]>; "Electric Vehicle Discussion
List" <[email protected]>
Sent: 11-Aug-14 12:59:19 PM
Subject: Re: [EVDL] Conversion advice (regen)
On Aug 11, 2014, at 12:49 PM, Robert Bruninga via EV
<[email protected]> wrote:
As for regen, the efficiency improvement you get over DC will
vary...
Typically the improvement is small, because you just don't spend
that much time braking. ... Learn to make use of coasting and
you can probably match the range improvement of regen.
Amen. With my CITY car I agonized over all kinds of designs for Regen
but
once I started driving it, I realized I hardly ever used the brakes.
(somewhat due to them being old and worn out in the first place)...
but
still, after also driving a Prius and similarly avoiding brakes or
regen,
the amount from regen is not worth it (I am going on the assumption
that
regen in DC traction motors causes undue arcing of the comutator...)
I already drive like that, too...but I'm still anticipating regen as
being very helpful in my wacky hybrid Mustang. Sure, if it marginally
improves efficiency by recovering a bit from deceleration, that's
great...but what I'm *really* looking to use it for is to maintain a
minimum charge in the batteries in hybrid mode. That will let me use
the electric motors primarily for acceleration even after the end of
the hybrid mode driving range. And, since the electric motors are much
more efficient at accelerating than the ICE, the minimal parasitic drag
to just barely keep a bit of usable charge in the batteries should
still balance things in the favor of both economy and performance.
For a pure BEV conversion, I don't think I'd care all that much either
way about regen.
b&
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