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Tire air pressure monitoring apparatus and method

  • US 6,359,556 B1
  • Filed: 03/13/2000
  • Issued: 03/19/2002
  • Est. Priority Date: 10/12/1999
  • Status: Expired due to Term
First Claim
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1. A tire air pressure monitoring apparatus having a transmitter for wirelessly transmitting data concerning the internal pressure of a tire on a vehicle and a receiver for receiving the data, the apparatus comprising:

  • generation means, provided in the transmitter, for assigning a value to a variable according to a predetermined sequence every time the transmitter sends data, wherein the transmitted data includes a current value of the variable; and

    determination means, provided in the receiver, for determining whether there has been a communication failure based on the value of the variable in the received data.

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