Quote:
Originally posted by Abwehr
Each "tick" of a rotation sensor would correspond with a distance travelled equal to the circumference of the wheel, as I understand it.
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The rotation sensor actually is measuring a distance much less than the circumference of the wheel. Our resolution is under two inches per tick and with the tread material we use slippage is kept to a minimum. All in all the accumulated error due to slipping in a 15 second period doesn't amount to very much. If the auto mode was longer than 15 seconds we would need to use something else, perhaps a fifth wheel. A bigger problem is that with a rigid frame and no suspension, all the wheels do not stay on the ground when hitting the ramp at an angle. Our sensors are only on one wheel at the moment and perhaps sensors at every wheel averaged in software would make things more accurate. Of course that would add weight and we are already at 130.