At 01:53 PM 19/10/2004 -0400, you wrote:
>How does this work? A metallic toothed wheel with an inductive pickup next
>to it? Does the pickup need a magnet on one side (I think the hall effect
>devices work this way), or is the coil used as a variable inductor in a
>resonant circuit?
>

I've interfaced to truck VSS sensors. They already have a magnet built in,
so the passing tooth induces a field. Very simple to interface, two wires,
just limit the ac coming in, and convert to ttl.

Don't know much about racing cars, but I would imagine it'd be easier to
control spin on the wheels using the brake, as in opposite to abs. (limited
slip)

Basically monitor two systems independently;
propshaft speed(use one wheel speed) related to engine power/throttle in
one relationship

back wheel speeds related to each other and brake control on fastest wheel
if more than say 10% of other.
it's a lot easier/quicker to limit a wheel than drop the engine power and
bring it up again? This control  would be easier using an op-amp balance.

Regards
Roland


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