New 42Volt systems

[Wes Branchflower]

hmm.. interesting



>From: Jeroen Proveniers <J.Proveniers at orga.nl>
>Reply-To: diy_efi at diy-efi.org
>To: "'diy_efi at diy-efi.org'" <diy_efi at diy-efi.org>
>Subject: RE: New 42Volt systems
>Date: Wed, 24 Jan 2001 09:38:50 +0100
>
> > -----Original Message-----
> > From: Wes Branchflower [mailto:hemi_265 at hotmail.com]
> > Sent: Wednesday, January 24, 2001 8:34 AM
> > To: diy_efi at diy-efi.org
> > Subject: New 42Volt systems
> >
> >
> > Why dont they just bring the 12 upto 42volts with an invertor for the
> > electronic valves instead of upgrading the whole system to
>
>Stepping up voltages costs power, a DC/DC convert has not 100% efficiency.
>And the generator can produce large voltages easily, at higher rpms and no
>regulator 150 volts would be no problem.
>
>Say you need 40A/42V, with a stepup converter and 100% efficiency this 
>would
>lead to currents of 140A amps, you would need very thick cables. And more
>important, reliability is I think not what the industries demands. Fuel
>economy would suffer too.
>
>And, it is expected that there a 12V subsystem to keep things compatible 
>for
>lamps,radios etc. The 42V system is for the real power hungry stuff like
>electronic valves, electric power steering etc.
>The need for a higher voltage is also becuase of the thinner cabling you 
>can
>use, thus reducing weight and conductor losses.
>
>And finally, the  industry is working on a starter/generator hybrid
>integrated into the flywheel.
>
> > 42volts, or is
> > their other reasons?
> > So their will be 42Volt batteries in cars soon?
> > I wonder why they chose 42volts?
> >
> >
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