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Tire pressure monitoring system

  • US 9,428,014 B2
  • Filed: 03/26/2009
  • Issued: 08/30/2016
  • Est. Priority Date: 04/04/2008
  • Status: Active Grant
First Claim
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1. A tire pressure monitoring system comprising:

  • a wheel electronic installable in a pneumatic tire, the wheel electronic comprising a battery as power source, a pressure sensor for measuring of tire pressure or pressure change, and a transmitter for transmitting non-critical pressure data and critical pressure data, wherein the critical pressure data is a rapid pressure drop indicating a blowout of the pneumatic tire;

    a receiver for receiving the non-critical pressure data and the critical pressure data;

    a control unit for evaluating the non-critical pressure data and the critical pressure data;

    a serial bus system interconnecting the control unit and the receiver for enabling the control unit to interrogate the receiver and receive the non-critical pressure data from the receiver, wherein the serial bus system is a master-slave bus system; and

    a data transfer line, separate from the serial bus system, for connecting the receiver with the control unit, the receiver being configured for sending to the control unit the critical pressure data via the data transfer line in an unrequested manner;

    wherein the receiver, the control unit, the serial bus system and the data transfer line are mounted either in or at a vehicle of the pneumatic tire;

    wherein the wheel electronic comprises an evaluation unit for gathering, from signals of the pressure sensor, the non-critical pressure data and the critical pressure data to be transmitted, the evaluation unit determining according to a stored criteria whether the data is non-critical pressure data or critical pressure data, the evaluation unit including a special identifier associated only with the critical pressure data, wherein the special identifier comprises a bit or a bit string;

    wherein the wheel electronic transmits the critical pressure data with the special identifier, enabling the receiver to recognize that the critical pressure data is to be sent by the data transfer line;

    wherein via the serial bus system the receiver sends the non-critical pressure data to the control unit only upon request of the control unit, and wherein via the data transfer line the receiver sends the critical pressure data within a few milliseconds to the control unit only upon recognizing the special identifier.

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