Tire pressure monitoring using half duplex transponder frequency shift
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United States of America Patent
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Mar 20, 2018
Grant Date -
Oct 8, 2015
app pub date -
Apr 6, 2015
filing date -
Mar 27, 2012
priority date (Note) -
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Abstract
A tire pressure sensor has an RFID (radio frequency identification) device having a parallel resonant circuit including an inductor and a first capacitor for generating a first radio frequency (RF) signal for transmission to a reader circuit, and a second capacitor coupled across the parallel resonant circuit by a first switch in a first position and generating a second RF signal for transmission to the reader circuit. A capacitive pressure sensor is coupled across the parallel resonant circuit by the first switch in a second position for generating a third frequency RF signal for transmission to the reader, wherein a difference in frequency between the first and third RF signals is indicative of a pressure of a tire.
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