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sensor pro
User Rank
Gold
Re: BMW's Percussion disconnect for Z3
sensor pro   3/20/2012 12:12:34 PM
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What would be the result of an accident if the dent is in the area of the bettery and the terminal shorts to some other part of the body of the car. ?

I'm not sure the relay will help.

TJ McDermott
User Rank
Blogger
Insulation too
TJ McDermott   3/20/2012 11:48:44 AM
NO RATINGS
The cables in question will be exposed to temperature extremes (0-100 F in ambient swing alone).  The insulation of these cables will have to stand up to that, as well as engine heat, and do so for a design life of a decade or more.  No cracking or degradation of the insulation will be acceptable.

trawickim
User Rank
Iron
BMW's Percussion disconnect for Z3
trawickim   3/20/2012 10:56:25 AM
NO RATINGS
The BMW 2000 Z3 already has the answer to post accident power removal  with percussion connector at positive battery post.

The unit is designed to fire and disconnect battery source upon deployment of airbag from accident.

Sehr gutes engineering von BMW!

 

Trawickim

 

Alexander Wolfe
User Rank
Blogger
Re: Greater potential shocks
Alexander Wolfe   3/20/2012 9:05:18 AM
NO RATINGS
Your imagination is correct, Rob. Even in non-accident situations, the use of higher voltages adds an additional layer of engineering, as Chuck points out, in the form of isolators. Supposedly, a high-voltage isolator fault was at issue in the recent Fisker Karma car which "died" when it was brought out to Consumer Reports's test track.

Rob Spiegel
User Rank
Blogger
Greater potential shocks
Rob Spiegel   3/20/2012 8:13:05 AM
NO RATINGS
I would imagine the high voltages would also come with higher potential safety problems. I would imagaine the higher voltages could be an issue in collisions.

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