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Tire condition monitoring apparatus

  • US 6,965,306 B2
  • Filed: 07/13/2001
  • Issued: 11/15/2005
  • Est. Priority Date: 05/10/2001
  • Status: Expired due to Fees
First Claim
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1. A tire condition monitoring apparatus for monitoring a condition of a tire attached to a vehicle, the apparatus comprising:

  • a transmitter, which is operated by a battery and detects at least a temperature in the tire and a voltage-related value that varies in accordance with a voltage of the battery, wherein the battery has a life; and

    a controller, which judges whether or not the life of the battery is ending depending on the voltage-related value, wherein the judgment regarding the life of the battery is performed in accordance with a comparison of the voltage-related value that varies in accordance with the voltage of the battery with a voltage-related reference value that is based at least in part on the temperature in the tire.

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