Patent ID: 7791461

Claim:
A tire management system comprising a sensor module secured to inside of a tire mounted on a vehicle, for measuring a tire status value and transmitting the measured data to a vehicle body side, and a receiver module secured to the vehicle body side, for transmitting a signal demanding said measured data to the sensor module at a predetermined cycle, and receiving the measured data transmitted from the sensor module, wherein: the receiver module transmits a data demand signal demanding transmission of the measured data, to the sensor module at a first cycle T 1 , and the sensor module measures at least one tire status value at a second cycle T 2 that is shorter than said first cycle T 1 ; said sensor module is so designed as to judge, with respect to each measurement performed at the second cycle, whether the measured data is out of a predetermined normal range, and transmit as soon as it has been judged that the measured data is out of a predetermined normal range, the measured data and a data indicating abnormal state to the receiver module through a predetermined abnormal state data transmission exclusive channel; and said receiver module having a frequency range for a demand signal channel for transmitting the measured data demand signal, and said sensor module having a frequency range for a response signal channel for said transmission based upon detection of reception of the data demand signal from said receiver module, said frequency ranges being so determined as to avoid overlapping with said abnormal state data transmission exclusive channel.