Re: seat heater (& mystery box)

[audistuff@juno.com (Paul R Anderson)]

Wait a minute.  An accelerometer won't tell you if you're moving.  It
will only tell you if you're accelerating or decelerating (in any
direction).
It would have to be extremely sensitive.  Can someone shed a little
more light on this subject for me?
Thanks


Paul Anderson, Cheyenne, WY  Private email:AndersonPaul@juno.com



>There is a _small_ black box with two wires attached under the rear 
>seat of 
>many post-1988 cars.  It's an accelerometer.
> 
>Many ABS systems use _only_ wheel sensors to determine if the vehicle 
>is 
>moving.  The problem is that if you're very unlucky and all of the 
>wheels lock 
>at once, the system has no input to tell it you're still moving.  It 
>was 
>possible to fool the system fitted in my 1987 Ford Granada this way, 
>especially 
>on wet ice - it was one of my favourite demonstrations.
> 
>Audi has fitted accelerometers since the late 1980s to overcome this 
>problem.
>
>-- 
> Phil Payne
> Committee Member, UK Audi [ur-]quattro Owners Club
>