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Can 48V Be the Auto Industry's Next Big Thing?

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Re: Incremental is good
ragtoplvr   7/31/2013 9:00:57 AM
As I recall, there were 2 issues on the 42V

1.  Higher voltage FETS were too expensive

2  42V incadescent light bulb life in automotive environment was too short.

Both these are no longer issues.



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42 Volts
apresher   7/30/2013 9:04:45 PM
Chuck,  I did an article on 42 volt systems 7-8 years ago, and the concerns were $ and safety. It looked at one point like 42v systems would be gaining a foothold, but within a year or two the tide had turned. Any idea if these factors (I'm sure $ is important) are still front and center? Thanks.

Charles Murray
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Re: Miraculous EU Marketplace
Charles Murray   7/30/2013 6:54:58 PM
You nailed it, tekochip. That's the driver.

Charles Murray
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Re: Miraculous EU Marketplace
Charles Murray   7/30/2013 6:54:20 PM
I detect a trace of irony in your question, but as I think you are pointing out here, they're not being coerced. There was no mandate. Start-stop came into being as a way of lowering emissions, and then European consumers just wanted it.

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Re: Miraculous EU Marketplace
tekochip   7/30/2013 1:55:13 PM
They pay more for fuel.

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Miraculous EU Marketplace
Reliabilityguru   7/30/2013 10:53:20 AM
Extraordinary "in Europe, approximately 50 percent of the cars produced this year will be start-stop vehicles". That's about as universal as it gets in a free market. How are the EU consumers being coerced?

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Incremental is good
naperlou   7/30/2013 9:56:27 AM
Chuck, it seems that this would be an incremental increase (15%) that would be a lot less costly than a full hybrid or EV.  This is a good thing.  Couple that with increases in efficiency in the ICE and increased aerodynamics and you can easily reach the CAFE goals for a very reasonable price. 

I am also impressed that this system would run the A/C and other heavy loads on the engine.  The disturbing trend in autos today is increased power in the same displacement.  If instead of increasing power by 20%, the displacement was decreased by 20%, then fuel efficiency would go up almost for free (no new, exotic technology).  For example, the Chrysler 3.5L V6 that was first used in their LH cars produces 250HP.  As a comparison, my dad's 1970 Olds Delta 88 with a 5.7L (350 CuIn) V8 produced 250HP.  The newest 3.5L V6s produce about 300HP.  Now, if we just use a 3L at 250HP, then gas mileage would go up accordingly.  Believe me, 250HP is enough for a 3,600lb automobile to go fast.  If you take the load of the A/C and other items off the ICE, then you can lower the HP even more for the same performance. 

Why hasn't this happened?  Maybe the standards should be tighter, sooner.

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