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Tire air pressure monitoring device and pneumatic tire having the tire air pressure monitoring device

  • US 6,931,921 B2
  • Filed: 08/28/2003
  • Issued: 08/23/2005
  • Est. Priority Date: 08/28/2002
  • Status: Active Grant
First Claim
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1. A tire air pressure monitoring device having a sensor which detects a physical quantity relating to tire air pressure, and a transmitter which sends signals detected by the sensor,wherein the sensor is a sound pressure level sensor which detects a sound pressure level inside a tire cavity filled with air, the transmitter being enabled to send the signals only when the sound pressure level detected by the sound pressure level sensor is changed, and wherein the sound pressure level detected by the sound pressure level sensor is a frequency around a resonance inside the tire cavity.

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