| 摘要 |
PROBLEM TO BE SOLVED: To precisely detect a plurality of measuring values such as a pneumatic pressure and a temperature of a tire while restraining increase of costs. SOLUTION: A transponder 10 comprises an antenna 11, a diode 12 modulating and demodulating signals transmitted and received between it and a controller, a resonator 14 changing a resonance frequency according to the temperature of the tire, and a pressure sensor 15 changing a resistance value according to the pneumatic pressure of the tire. The controller transmits the signals for resonating the resonator 14, receives the signals of the resonance frequency of the resonator 14 from the transponder 10, calculates the temperature of the tire according to the signals of the resonance frequency extracted from the received signals, and calculates the pneumatic pressure of the tire according to a signal level of the signals of the resonance frequency. COPYRIGHT: (C)2007,JPO&INPIT |
