Tire air pressure monitoring system
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United States of America Patent
Stats
-
Apr 17, 2001
Grant Date -
N/A
app pub date -
Aug 25, 1999
filing date -
Aug 25, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A tire air pressure monitoring system includes transmitters and a receiver. The transmitters wirelessly transmit data regarding the inner pressure of tires and the receiver receives the data from the transmitters. Each transmitter has its own ID code and includes a pressure sensor for measuring the inner pressure of the corresponding tire. Every time each pressure sensor measures the pressure, the corresponding transmitter generates a time interval by performing a pseudorandom number calculation based on the measured pressure and its ID code. The pressure sensor will measure the pressure each time the obtained time interval elapses. When each pressure sensor measures the pressure for a predetermined number of times, the corresponding transmitter wirelessly transmits data. This system prevents the transmitters from interfacing with one another and facilitates the manufacture of the transmitters.
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