TIRE PRESSURE MEASURING SYSTEM AND TIRE PRESSURE MEASURING DEVICE

摘要

In a tire pressure measuring system (TPMS) for transmitting pressure information from a tire to a vehicle body side, the system configuration is complicated if a plurality of transmission data types exist. A sensor unit (6) receives a transmission electromagnetic field from a sensor control unit (10) and rectifies and detects it. The sensor unit (6) has a counter (30) which detects a tire rotation cycle according to the rectification detection signal, switches a switch (32) in linkage with its rotation cycle, and successively transmits a plurality of transmission data for each tire rotation.