[Diy_efi] GDI Cont'd

[Mike]

err yes but in conventional parlance we have a 12v system
not a 13.8v system, bulbs, injectors, modules are said
to be 12v rated not 13.8v rated etc.

Things get more interesting with the higher voltage,

So the conventional parlance is thrown out the window, I
can see some electricians and techs getting confused over
this, do they buy a 36v bulb or a 42v bulb as we now
buy a 12v bulb and not a 13.8v bulb...

Hey ! Maybe we can make our own 32v ac and use all those
peripherals made in the late 50's and 60's in australia
which grace the support for the old sink in the back shed ;-)

32v ac from 36/42 volts would be a sinch with a simple
bridge PWM converter.

With 32/42 it would make more sense to have one SMPS (boost/
buck) integrated with the charger, supply a regulated rail - instead
of duplicating any buck/boost regulators around the system,
which is not to be confused with voltage correction for
pulse width for injectors etc...

Hey Bernd, do you want me to post you that cap, or shall I
drop it off to reptile (Paul), who is in Chaucer way Kalamunda,
I think he mentioned he knew you...(Had a stroke little while ago,
now fully recovered).

rgds

mike




At 12:57 PM 13/1/2003 +0800, you wrote:
>On Mon, Jan 13, 2003 at 12:47:57PM +0000, Mike wrote:
>> At 12:31 PM 13/1/2003 +0800, you wrote:
>> >On Mon, Jan 13, 2003 at 11:53:05AM +0000, Mike wrote:
>> >> I thought the 'new' volt standard was going to be 44v or was it 42 ?
>
>> >> I seem to recall BMW and merc agreeing to either 44 or 42...
>
>> >SAE seem to think 42V - though in essence it's just 3 * 13.8V :-)
>> >based on the nominal "12V" system currently in use.
>
>> >Plenty of agreement from OEM's. They're not just lining up funky
>> >flywheels, but precious pumps, chilling compressors and brazen
>> >brakes, all dependent on 42V technology.
>
>> So are we really talking 36 v from the battery, nominal ?
>
>Ermmm... no. The present "12V" system is actually a 13.8V system
>when operating nominally. If the battery only produces 12V, it's
>pretty R.S.
>
>> Or is there impetus for a large SMPS/charger to keep a
>> stable real 42v from a 36v battery, would make some sense ~`:o
>
>The 42V is the "raw" voltage. It's fed to the main power consumers
>that can monitor the voltage if they care, and adjust their current
>draw, if it matters. Power electronics and controllers are now fast
>enough and cheap enough so that regulating the voltage output for a
>constant output isn't critical. 
>
>i.e. Consumers either regulate their voltage internally for a
>constant voltage; or they adjust their behaviour according to
>available voltage. (EFI has been doing that for quite a while,
>already.)
>
>Car audio, etc will still have the "12V" available; either from a
>DC/DC convertor, or simply pulling the bottom third off the battery
>stack.
>
>-- 
>/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
>\ /  ASCII ribbon campaign | I'm a .signature virus!
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>
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