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Method and device for filtering information emitted by a pressure sensor mounted on a wheel of a vehicle

  • US 20060047469A1
  • Filed: 09/01/2005
  • Published: 03/02/2006
  • Est. Priority Date: 09/01/2004
  • Status: Active Grant
First Claim
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1. A method for filtering information emitted, on the basis of pressure measurements taken by a pressure sensor arranged in a wheel unit mounted on a wheel of a vehicle equipped with a tire, to a central unit mounted on said vehicle, wherein the wheel unit:

  • measures periodically, with a period θ

    , a value representative of the pressure of the air in the tire, and from this deduces any variations Δ

    P in pressure between the values of the pressures successively measured, in parallel, with the same period θ

    , measures a value representative of the temperature of the air in the tire, and, when a variation Δ

    P in pressure between two successively measured pressure values is greater, in terms of absolute value, than a predetermined threshold Sp, the wheel unit;

    calculates the variation Δ

    T between the two temperature values measured at the same instants as said measured pressures, from this deduces a compensation coefficient Cp such that Cp=Δ

    P/Δ

    T, and commands the wheel unit to emit a signal representative of a pressure variation to the central unit if;

    a) Δ

    T=0, or if b) the compensation coefficient Cp is positive and higher than a determined threshold coefficient Cp1, or if c) the compensation coefficient Cp is negative and does not lie between a minimum threshold and a maximum threshold.

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