Device for monitoring the air-pressure in pneumatic tires fitted on vehicle wheels

CAFC
  • US 5,602,524 A
  • Filed: 11/23/1993
  • Issued: 02/11/1997
  • Est. Priority Date: 02/26/1992
  • Status: Expired due to Term
First Claim
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1. A device for monitoring the air pressure in the air chamber of pneumatic tires fitted on vehicle wheels comprising:

  • a pressure measuring device mounted on a vehicle wheel which measures the air pressure in the air chamber of the wheel end outputs an electrical pressure signal representative of the air pressure in the vehicle wheel;

    a transmitter mounted to the vehicle wheel which receives the electrical pressure signal output from the pressure measuring device and sends out a pressure transmitting signal corresponding to said air pressure;

    a receiver associated with the transmitter and mounted at a distance to the vehicle wheel which receives the pressure transmitting signal transmitted from the associated transmittersa display device which is connected with the receiver and displays data as numbers or symbols which have been taken from the pressure transmitting signal received from the receiver;

    wherein the transmitter comprises an emitter-control device which controls the emittance of the pressure transmitting signal and a signal-generating device which generates an identification signal which is unique for the transmitter and clearly identifies same;

    the emitter-control device works such that the identification signal is transmitted at least once before or after the emittance of the pressure transmitting signal;

    the receiver comprises at least a memory in which is stored an identification reference signal related to the associated transmitter in accordance with a predetermined relationship criteria;

    the receiver comprises a comparison device which checks if an identification signal transmitted from a transmitter has the relationship criteria to identification reference signal stored in the receiver, and that further processing of the pressure transmission signal taken from the receiver only takes places if the identification signal received by the receiver and the identification reference signal stored in the receiver fulfill the relationship criteria;

    the identification reference signal stored in the receiver is changeable in order that the identification signal from the associated transmitter matches the identification reference signal of the receiver; and

    the receiver is connected with a switching device which enables the receiver to switch over from normal operating mode, in which the air pressure is monitored, to pairing mode, in which the receiver collects the identification signal of the transmitter and stores this as an identification signal.

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