It sure worked good for Al.
Bryan
Dave Dahlgren wrote:
>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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