Importance

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Abstract

Each transmitter installed in tires on a vehicle generates a variable value, which is updated according to a predetermined sequence every time it sends data. The current value of the variable is transmitted to a receiver regularly along with other the information. The receiver determines whether any receptions have been skipped prior to the current reception based on whether or not the variable value included in the received data has been updated according to the sequence. The receiver judges that there is a communication failure when the number of skipped receptions is equal to or greater than an upper limit value and judges that there is no communication failure when the skipped reception number is less than the upper limit value. This permits easy and reliable detection of communication failures.

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First Claim