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System, method and apparatus for monitoring tire inflation pressure in a vehicle tire and wheel assembly

  • US 5,569,848 A
  • Filed: 01/06/1995
  • Issued: 10/29/1996
  • Est. Priority Date: 01/06/1995
  • Status: Expired due to Term
First Claim
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1. A method of measuring inflation pressure of a pneumatic tire in a tire and wheel assembly on a vehicle comprising the steps of:

  • (a) monitoring a rotational characteristic of the tire and wheel assembly,(b) monitoring at least one additional characteristic of the vehicle that is independent of rotational characteristics of any tire and wheel assemblies of the vehicle, and(c) indicating tire inflation pressure of the tire and wheel assembly monitored in said step (a) as a combined function of the characteristics monitored in steps (a) and (b),said step (c) of indicating inflation pressure comprising the steps of;

    (c1) obtaining, in a calibration mode of operation, data which relates rotational characteristics of the tire and wheel assembly monitored in step (a) to inflation pressure of such tire, and thereafter(c2) indicating inflation pressure of such tire as a combined function of characteristics monitored in steps (a) and (b), and calibration data obtained in said calibration mode of operation.

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