Re: Measuring Battery capacity/charge (Re: Understanding Automakers EV Perspective)

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#6162

From: John Gruffydd
Date: Fri, 12 Jan 1996 00:00

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On Fri, 12 Jan 1996 02:55:30 GMT, grep@cris.com (George B) wrote:

>
>I disagree. Power plants operate at maximum efficiency only at full
>throttle.  Cars operate at maximum at everywhere EXCEPT full throttle.
>
That's not true.  In a gasoline engine at least, the lowest specific
fuel consumption is achieved at about 3/4 (or more) of full throttle
and in the middle of the speed range.  Engine efficiency suffers
considerably when well throttled back, especially at high engine
speeds.  Hence the interest in the gasoline hybrid, where the engine
can operate most of the time in its most efficient condition because
it is buffered from the variable road load by the energy store, eg
battery or flywheel.

In the UK (and I'm sure in the US too), the most efficient and newer
electricity power plants supply the base load; as demand increases the
poorer and older plants are progressively brought on line. Therefore,
it is most likely that the overall efficiency of electricity
generation is least when the network as a whole is "flat out".

--
John Gruffydd (Mold, Wales, UK)

john.g@dial.pipex.com

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From: john.g@dial.pipex.com (John Gruffydd)
Subject: Re: Measuring Battery capacity/charge (Re: Understanding Automakers EV Perspective)
Date: 1996/01/12
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