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Circuits for coupling signals carrying information to a tire pressure monitoring system in the absence of a receiver

  • US 20040070494A1
  • Filed: 10/09/2002
  • Published: 04/15/2004
  • Est. Priority Date: 10/09/2002
  • Status: Active Grant
First Claim
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1. A tire pressure monitoring system connectable to a valve stem for supplying air to a respective tire, the system comprising:

  • a pressure sensing device;

    a printed circuit board;

    a microprocessor mounted on the printed circuit board and electrically coupled to the pressure sensing device;

    a connector for electrically connecting the printed circuit board to a respective valve stem end disposed within the tire;

    a circuit providing capacitive coupling to pass an externally-derived stream of pulses to the microprocessor upon connecting an external device that generates the stream of externally-derived pulses to the valve stem, the stream of pulses carrying information usable by the processor to perform a respective operational function.

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