The PFS uses the standard validated model of forces acting on a rider to simulate instantaneous forces at the pedal.It measures acceleration and, using the standard model of forces acting on the rider, applies a resistive force at the pedals that is theoretically equal to the force a rider would feel riding outdoors under the simulated conditions.
It does this using a brake that is electronically controlled by a computer in the resistance unit. The computer recalculates force at the pedals 1000 times per second so that the instantaneous force a rider feels at the pedal is always a theoretically correct force.
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