The reason we can't do that is because it would require electronic brake
activation. That would likely be heavy and it would add complexity to the
system that we would like to avoid.

Andy

----- Original Message -----
From: "Roland" <jemelectric@mweb.co.za>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Tuesday, October 19, 2004 10:36 PM
Subject: Re: [PIC] Traction Control / Wheelspeed sensing


> 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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