Patent ID: 8731798
Filing Date: 2014-05-20
Classification: G01K

Abstract:
1. An apparatus for estimating temperature for an aeroplane gas turbine engine mounted on an aircraft and having a combustion chamber, a high-pressure turbine rotated by high-pressure gas exhausted from the combustion chamber, and a low-pressure turbine located downstream of the high-pressure turbine to be rotated by low-pressure gas which has passed through the high-pressure turbine, comprising: a low-pressure turbine rotational speed sensor adapted to detect a rotational speed of the low-pressure turbine (N an ambient temperature sensor adapted to detect an ambient temperature of the engine (T an outlet temperature sensor adapted to detect an outlet temperature of the low-pressure turbine (EGT); a high-pressure turbine rotational speed sensor adapted to detect a rotational speed of the high-pressure turbine (N an atmospheric pressure sensor adapted to detect an atmospheric pressure (P an outlet temperature change calculator that calculates a low-pressure turbine outlet temperature change (dEGT) based on at least the detected low-pressure turbine rotational speed (N a model outlet temperature difference calculator that calculates a model outlet temperature (MODEL-EGTC) based on at least a corrected high-pressure turbine rotational speed (N a model outlet temperature difference correction amount calculator that calculates a correction amount (dEGTad) relative to the calculated model outlet temperature difference (dEGTC) based on the calculated model outlet temperature difference (dEGTC) and the detected low-pressure turbine rotational speed (N an inlet temperature estimation value calculator that calculates an estimation value of the low-pressure turbine inlet temperature (ITT) based on at least the detected low-pressure turbine outlet temperature (EGT), the calculated outlet temperature change (dEGT) and the correction amount (dEGTad) relative to the calculated model outlet temperature difference (dEGTC), wherein the model outlet temperature difference calculator calculates the model outlet temperature (MODEL-EGTC) by retrieving second characteristics preset beforehand by the corrected high-pressure turbine rotational speed (N