Tire air pressure monitoring device and pneumatic tire having the tire air pressure monitoring device
First Claim
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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Accused Products
Abstract
A tire air pressure monitoring device includes a sensor which detects a physical quantity relating to tire air pressure, and a transmitter which sends signals detected by the sensor. The sensor is a sound pressure level sensor which detects a sound pressure level inside a tire cavity filled with air. The transmitter is enabled to send the signals only when the sound pressure level detected by the sound pressure level sensor is changed.
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Citations
8 Claims
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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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5. A pneumatic tire having a tire air pressure monitoring device in a cavity of the tire,
the 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, the sensor being 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, wherein the sound pressure level detected by the sound pressure level sensor is a frequency around a resonance inside the tire cavity.
Specification