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System to measure wheel liftoff

  • US 7,557,697 B2
  • Filed: 02/22/2005
  • Issued: 07/07/2009
  • Est. Priority Date: 02/22/2005
  • Status: Active Grant
First Claim
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1. A method of determining wheel departure from a road comprising:

  • measuring the wheel speed of four wheels;

    calculating a resonance frequency of the four wheels based at least in part on wheel speed;

    calculating variations in the amplitude of the resonance frequency;

    comparing the variations in the amplitude of the resonance frequency with a threshold;

    indicating a complete lift-off condition of a wheel from the road if the variations exceed a threshold, the wheel being lifted off of a contact surface leaving an air gap between the wheel and the contact surface in the lift-off condition; and

    determining and providing a wheel lift status condition that provides whether the complete lift-off condition is no-wheel lift, single-wheel lift, two-wheel lift or single-wheel lift. with impending two-wheel lift.

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