Matt,
I can follow your logic if the skid is on pavement where at least one
wheel has good grip. If all four wheels were on ice, how would it sense
deceleration?
Bob
On Fri, 21 Jan 2000 08:43:47 -0500 Matt Pringle <pringlmm@mcmaster.ca>
writes:
> Actually sensing the difference between being stopped and skidding
> with
> all wheels locked is very simple and I'd be very surprised if they
> don't
> do it already. When you're skidding, you're still slowing down and
> so
> an accelerometer could easily sense this.
>
> Matt
>
> Chris Kotting wrote:
> >
> > Paul -
> >
> > Aha! You've discovered ABS's weak point. Allow me to ask a
> question:
> > How does ABS know that a wheel is locked? Think about this for a
> second
> > before reading the next line.
> >
> > Ready for the answer?
> >
> > By comparing rotional speeds of the four wheels.
> >
> > Now for the next question: How can an ABS system tell the
> difference
> > between these two states (a) all four wheels locked and sliding,
> and (b)
> > stopped?
> >
> > Answer? It can't.
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