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Auto-calibrating wheel balancer force transducer

  • US 8,886,491 B2
  • Filed: 04/27/2011
  • Issued: 11/11/2014
  • Est. Priority Date: 04/30/2010
  • Status: Active Grant
First Claim
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1. A method for automatic calibration of a piezoelectric force transducer wherein the force transducer contains at least a pair of piezoelectric elements disposed to measure forces in a common axial direction, comprising:

  • applying a first input signal having a voltage component to a first piezoelectric element to generate a first force applied to said second piezoelectric element in said pair, and receiving a first output signal having an associated voltage component and an associated phase from said second piezoelectric element in said pair, said first output signal representative of a response by said second piezoelectric element to said first generated force;

    applying a second input signal to said second piezoelectric element in said pair to generate a second force applied to said first piezoelectric element in said pair, and receiving a second output signal having a second associated voltage component and a second associated phase from said first piezoelectric element in said pair, said second output signal representative of a response by said first piezoelectric element said second generated force;

    wherein said first and second output signals define a set of output signals; and

    evaluating said set of output signals to establish compensation values for calibrating subsequent output signals from said first and second piezoelectric elements.

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