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Self-powered tire revolution counter

  • US 6,438,193 B1
  • Filed: 01/10/2001
  • Issued: 08/20/2002
  • Est. Priority Date: 07/10/1998
  • Status: Expired due to Term
First Claim
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1. Piezoelectric-powered tire revolution counter, comprising:

  • a piezoelectric element attached to or embedded within a wall of a pneumatic tire in a manner to be subjected to periodic mechanical stresses as the tire rotates, thereby generating energy pulses;

    power circuitry connected to the piezoelectric element for receiving the energy pulses, having an output for supplying a DC voltage (Vdd) to power circuitry of the revolution counter; and

    a revolution counting circuit connected to the piezoelectric element for receiving the energy pulses;

    wherein;

    the piezoelectric element is in the form of a circular unimorph.

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