On May 6, "travis...@[EMAIL PROTECTED]
" <travis...@[EMAIL PROTECTED]
> wrote:
> > > I hope you how hybrid cars work...the increased mileage
> > > comes from the decrease in wastage of kinetic energy
> > > through regenerative braking.
>
> > Only a small part of the overall increased
> > efficiency. It's mostly from operating at
> > constant, optimal engine speed. Also
> > from the energy saved on the transmission,
> > engine cooling, and emissions control.
>
> Totally wrong, but don't let that fucking stop you, man.
>
> Hybrid cars operating on the highway do NO BETTER
> than non hybrids with equivalent drag coefficients and
> powertrains.
>
> The hybrid drive system is a kinetic energy recapture
> device...that is ALL IT IS.
It's basic mechanics - an engine has
an optimal rpm, a hybrid is designed
to run that speed continually, charging
the battery.
Braking is only a fraction of overall
losses (though significant in city
driving), and regenerative recovery is
only about 30% of that. The engine
efficiency is the main thing.
Savings on water pump is probably
as much as regenerative recovery.
> They coast downhill with the engine off and do not use
> compression braking, which adds a few mpg. I've
> tested this shit in a non hybrid car, btw, coasting downhill
> or on flats versus running against the engine's compression.
> You can recover 10% mpg just by aggressive coasting.
>
> But, again, the hybrid system, the batteries and motors,
> are there to reclaim kinetic energy and then reapply that.
> That is BY FAR the largest advantage, and it is moronic
> to claim otherwise, especially
> when you can SEE the city/hwy mpg splits.
Sam
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