What happens if you are spinning the tires before the setpoint?? Add more
power to get desired accel? A slip indicator is easiest and works at all
speeds.
(Rear wheel speed / front wheel speed)-1 = % slip.. easy to do
You coud use a PIC micro and an lcd display, 2 wheelspeed sensors and you
are done. I am quessing around 200 in parts.
Dave
> -----Original Message-----
> From: owner-land-speed@Autox.Team.Net
> [mailto:owner-land-speed@Autox.Team.Net]On Behalf Of DrMayf
> Sent: Tuesday, November 16, 2004 10:06 PM
> To: land-speed@Autox.Team.Net
> Subject: Traction Control and Bench Racing..
>
>
> Seasons end is here and now we all turn to bench racing. Well
> some of us any
> way. Regarding Joe's comment about needing TC for acceleration because the
> courses are short or getting shorter (hopefully longer at
> B'ville). This is
> sorta on mark but the problem, seems to me, to be larger than
> that. I think
> we all agree that TC on the top end causes us slower speeds because
> ultimately power is removed from the rubber salt interface. So maybe TC
> isn't the answer there. As to the acceleration phase of a run,
> according to
> what I have read, wheel slippage of about 20% yeilds best acceleration
> (Dave, isn't this correct?). So rather than remove power maybe
> our traction
> control needs to add power, yeah, baby, that's it! If we have limited
> traction generally wouldn't it be better to do something else, like maybe
> taller tires? Or taller gears? Or a dab less air pressure in the driving
> tires (but within safety limits)? Or maybe some weight (some may
> argue that
> weight isn't a factor in traction, but, I believe it is)? I think
> there is a
> way for the driver to get the maximum traction from his vehicle, including
> bikes, and that is pretty simple. Grab yourself an acceleometer
> and a meter.
> Place the sense axis along the car/bike drive axis. Doesn't even
> have to be
> very accuraley located, just as long as it generally points the
> way you want
> to go. Dial a set point at or near the , ahem, salt coefficient
> of friction
> prolly around 0.65. Accelerate and keep the set point alarm lit using your
> foot and eyeballs...like a shift light. Then you would be getting the max
> acceleraion for the salt or dirt or whatever. I thinbk I will try and spec
> something out to see if this is reasonably easy to do as I have
> surnised...
>
>
> mayf, out in a dark Pahrump
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