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Monitoring a filter used for filtering a fluid in an aircraft engine

  • US 8,352,200 B2
  • Filed: 08/31/2010
  • Issued: 01/08/2013
  • Est. Priority Date: 08/31/2009
  • Status: Active Grant
First Claim
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1. A system for monitoring a filter used for filtering a fluid in an aircraft engine, comprising:

  • pressure measurement means for acquiring over time a differential pressure of the fluid through the filter;

    temperature measurement means for acquiring over time a temperature of the fluid through the filter;

    computing means for computing a current viscosity value of the fluid depending on its temperature;

    computing means for computing a current flow rate value of the fluid depending on the engine speed;

    computing means for computing a normalized differential pressure, under reference conditions by normalizing the differential pressure measured as a function of the conditions for exploiting the fluid, the fluid exploitation conditions used for normalizing the differential pressure including said current viscosity value and said current flow rate value;

    storage means for storing in memory a predetermined reference clogging curve describing a time-dependent change of the normalized differential pressure depending on a pollutant mass injected into the filter;

    computing means for estimating the pollutant mass injected into the filter by projecting a current value of said normalized differential pressure onto said reference clogging curve; and

    computing means for generating from said estimated pollutant mass a set of signatures defining the condition and the time-dependent change of clogging of the filter.

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