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Tire condition monitoring system

  • US 3,898,615 A
  • Filed: 03/18/1974
  • Issued: 08/05/1975
  • Est. Priority Date: 03/19/1973
  • Status: Expired due to Term
First Claim
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1. A system for automatically detecting an abnormal condition of a vehicle tire, comprising:

  • a sensor rotatable with the tire for detecting the abnormal condition;

    a rotatable coil concentrically mounted on a framework of a wheel on which the tire is fitted and connected in a series circuit arrangement with said sensor so that the impedance of the series circuit is reduced below a predetermined value by said sensor in response to the detected abnormal condition;

    an oscillator mounted on the vehicle structure including a pair of separate coils mounted adjacent to and on the inner side of said rotatable coil for inductive coupling therewith through said rotatable coil when the impedance of the series circuit is below said predetermined value;

    said pair of coils being spaced apart to face separate peripheral areas of said rotatable coilS; and

    an alarm device connected to said oscillator to produce a warning signal in response to oscillation therein;

    whereby when the impedance of the series circuit is below said predetermined value, inductive coupling between said fixed and rotatable coils allows sufficient feedback for said oscillator to produce oscillation therein.

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