MONITORING A FILTER USED FOR FILTERING A FLUID IN AN AIRCRAFT ENGINE
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;
characterized in that it comprises;
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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Abstract
The invention relates to a system for monitoring a filter (3) used for filtering a fluid (5) in an aircraft engine (7), including:
- pressure measurement means (27) for acquiring over time a differential pressure of the fluid (5) through the filter (3);
- computing means (11) for computing a normalized differential pressure under reference conditions by normalizing the measured differential pressure according to conditions for exploiting the fluid (5);
- storage means (13) for storing in memory a predetermined reference clogging curve (Cr) describing a time-dependent change of the normalized differential pressure depending on a pollutant mass injected into the filter (3);
- computing means (11) for estimating the pollutant mass injected into the filter (3) by projecting a current value of said normalized differential pressure onto said reference clogging curve (Cr); and
- computing means (11) for generating from said estimated pollutant mass a set of signatures defining the condition and the time-dependent change of clogging of the filter.
25 Citations
9 Claims
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1. A system for monitoring a filter used for filtering a fluid in an aircraft engine, comprising:
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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; characterized in that it comprises; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for monitoring a filter used for filtering a fluid in an aircraft engine, comprising the following steps:
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measuring over time a differential pressure of the fluid through the filter; measuring over time a temperature of the fluid through the filter; characterized in that it comprises the following steps; computing a current viscosity value of the fluid depending its fluid temperature; computing a current flow rate value of the fluid depending on engine speed; computing a normalized differential pressure under reference conditions by normalizing the measured differential pressure according to 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; storing a predetermined reference clogging curve describing a time-dependent change of the normalized differential pressure depending on a pollutant mass injected into the filter; estimating the pollutant mass injected into the filter by projecting a current value of said normalized differential pressure onto said reference clogging curve; and generating from said estimated pollutant mass a set of signatures defining the condition and the time-dependent change of clogging of the filter. - View Dependent Claims (9)
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Specification