PIC's and EST on a GM for traction control

[richard vandervoort]

>This recent PIC thread has got me really interested in one of my
>"pie in the sky" ideas.... Namely my dream of having traction
>control in my old car... So here's my idea: PIC are available in
>BASIC, so I can handle that (barely), what I would like to do is use
>the PIC to compare inputs from front wheels and the rear wheels, and
>when rear RPM is greater than front (by like 5-10 % or so, I could
>see having to play with this too) output a signal to the EST filter
>of a 747 or 165 ECM... Any thoughts? What does the knock sensor
>output to the filter, and is it easily mimicked by a simple PIC? Any
>thoughts on how fast the ECM could respond to a faked knock signal?
>Or could I tap into the wires from the filter to the ECM and send
>the ECM a direct signal from the PIC? 
>Any comments?
>Tom
>
If you are running this on the street with a catalytic converter you need to model the catalyst temperature and limit spark retard and cylinder drop out via your model so you don't burn up your catalyst.  I don't know what vehicle you are using but creating a vehicle reference velocity from non driven wheels is the only way to go.  Try using junkyard parts for speed sensors, make sure the tone rings are not dented or get integral bearing sensors.  


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