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Remote tire pressure monitoring system employing coded tire identification and radio frequency transmission and enabling recalibration upon tire rotation or replacement

  • US 5,838,229 A
  • Filed: 01/30/1997
  • Issued: 11/17/1998
  • Est. Priority Date: 07/18/1995
  • Status: Expired due to Term
First Claim
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1. In a vehicle having a plurality of wheels, each of said wheels having at least one tire mounted thereon, a tire pressure monitoring system including a display interface inside said vehicle for providing an indication of abnormal tire pressure, said system further comprising, for each of said tires, sensing transmitting means which comprise;

  • means for sensing pressure;

    means for producing signals indicative of temperature-compensated pressure of a respective one of said tires;

    means for encoding said signals so as to provide encoded signals, identifying said each of said tires, and location thereof on said vehicle uniquely; and

    means for transmitting said encoded signals;

    said system further comprising;

    means for receiving said encoded signals;

    means for decoding said encoded signals, and providing display signals accordingly; and

    means for providing a display indicative of low pressure and location of said each of said tires in accordance with said display signals;

    characterized in that the sensing/transmitting means are mounted internally of the tire, and in that the system comprises means for recalibrating said system such that, in the event of rotation of tires on said vehicle, said system reacquires information on said location of each of said tires, said means for recalibrating said system comprising a magnetically-activated switch, responsive to a magnetic field in a vicinity thereof, wherein activation of said switch causes transmission of a location of a respective one of said tires on said vehicle.

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