Tire pressure monitoring system

摘要

A vehicular tire pressure monitoring system, including a transponder unit ( 10 ) for each tire to be monitored, the transponder unit having an incorporated RF transmitter ( 12 ) and being physically associated with the tire to be monitored. A pressure sensor for each tire to be monitored is connected to circuitry in a corresponding transponder unit. An interrogator unit ( 7 ) is associated with each transponder unit and physically mounted on a vehicle in proximity to a wheel ( 9 ) whereon a tire to be monitored is mounted. A central RF receiver ( 4 ) for all transponder units is provided. Each transponder unit is inductively coupled with an associated interrogator unit and includes an electric charge accumulation element adapted to be charged by energy inductively supplied from the associated interrogator unit in a first mode of operation, and the charge accumulation element providing a power supply to the RF transmitter of the transponder unit in a second mode of operation.