Patent ID: 8682627
Filing Date: 2014-03-25
Classification: G01K

Abstract:
1. An estimation method for estimating a stream temperature in a turbojet, the method comprising: digitally modeling the stream temperature based on of a modeled signal; providing a measurement signal of the stream temperature which is measured using a temperature sensor disposed in the turbojet; determining if a temperature stability condition is satisfied based on a derivative of the measurement signal of the stream temperature; determining if a predetermined condition relating to at least one operating stage of the turbojet is satisfied; calculating an updated error signal based on an error signal from an immediately previous sampling period and a difference between the modeled signal and the measurement signal of the stream temperature using a filter of order greater than or equal to 1, when both the temperature stability condition and the predetermined condition relating to at least one operating stage of the turbojet are satisfied; and correcting the modeled signal by adding the updated error signal to the modeled signal, wherein, when at least one of the temperature stability condition or the predetermined condition relating to at least one operating stage of the turbojet is not satisfied, the error signal is not updated and the error signal from the immediately previous sampling period is used to correct the modeled signal; wherein the error signal is updated based on an adaptive algorithm; wherein the error signal is updated using an integral corrector type filter having a predetermined gain setting; and wherein the predetermined gain setting is set to zero when at least one of the temperature stability condition or the predetermined condition relating to at least one operating stage of the turbojet is not satisfied.