Condition monitoring system (tire pressure)

  • US 4,450,431 A
  • Filed: 05/26/1981
  • Issued: 05/22/1984
  • Est. Priority Date: 05/26/1981
  • Status: Expired due to Fees
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First Claim
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1. A tire condition monitoring system for monitoring the condition of a wheel mounted tire comprising;

  • exciter means for establishing an electromagnetic energy field having a first frequency, passive converter means responsive to said first frequency for creating energy having a second frequency, sensing means for changing amplitude of said energy at said second frequency by said converter means in response to a predetermined change of the tire condition, receiver means responsible to said energy at said second frequency for providing an indication regarding said energy at said second frequency, said converting means including harmonic multiplier means for making said second frequency a harmonic of said first frequency, said exciter means being inductively coupled to said converter means through a magnetic field, said receiver means including an E-field antenna for receiving an E-field from said converter means.

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