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Transponder startup control method and interrogator for tire pressure monitoring system

  • US 7,336,163 B2
  • Filed: 12/29/2004
  • Issued: 02/26/2008
  • Est. Priority Date: 01/20/2004
  • Status: Active Grant
First Claim
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1. A startup control method for a passive transponder adapted to be started up by receiving an interrogation signal and to return a requested response signal, said startup control method comprising the steps of:

  • judging presence or absence of a return of said response signal while monotonically increasing transmission power of said interrogation signal from an initial value;

    reducing the amount of increase of said transmission power stepwise every time normal reception of said return is judged to be absent; and

    maintaining said transmission power, every time said return is judged to be present, at the value of said transmission power as of the time when presence of said return was judged.

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