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Appendix A
Another advantage of these systems is that they are
actually able to detect wheel slip better than most wheel
speed sensor based systems. The reason for this is that
our systems monitor the rotation of the driveline. With 8
triggers on the driveline you can measure slip within 1/8 of
a rotation. Now factor in a 5:1 final drive (rear end) ratio
and tire rotation can be measured within 1/40 of a turn (that
is about 2-3 inches on most tires). The fact that the
driveline is turning much faster than the wheels, amplifies
the slip at the driveline, making these systems much more
sensitive than the typical wheel speed systems. Put
simply, if the tires slip the driveline revs. The only reason
for the sudden increases in revs in the driveline is wheel
spin.
Sensor based systems usually measure tire rotation about
every 1/4 of a turn. The front and rear are compared to each
other to check for slip. With a margin of error of 1/4 of a
turn at each wheel, it may take as much as 1/2 of a turn of
tire slip for the system to react. If a tire is allowed to slip a
half a turn before a correction is made, it is very hard to
stop the slip.
A system that uses a preset percentage of slip, between
the rear wheel speed to front wheel (or ground) speed,
cannot compensate for these changing conditions that
are inherent in all types of racing.
Traction Control Is What We Do!
29
Davis Technologies TMS-5500-SL Elec Points
www.moretraction.com
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