Integrated history recorder for gas turbine engines
First Claim
1. A history recorder for providing a record of the duty performed by a gas turbine wherein said recorder includes a plurality of integrally controlled displays each providing a display of a unique factor determinative of the duty performed by the engine, the invention comprising:
- means for displaying accumulated engine run time;
means for generating an engine speed signal indicative of engine speed; and
comparator means for comparing said engine speed signal with first and second reference speed signals, said first reference speed signal being indicative of a reference speed greater than said second reference speed, said comparator means operative to provide an output signal initiated in response to a comparison of said first reference signal with said engine speed signal and terminated in response to a comparison of said second reference signal with said engine speed signal, said engine run time display means providing a run time indication in response to said output signal.
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Abstract
An integrated history recorder for a gas turbine engine includes a number of integrally controlled displays which together provide a comprehensive record of accumulated engine life. The recorder is adapted to interface with an engine contained transducer assembly.
Displays indicative of the following parameters are provided: the number of engine starts, engine running time, the number of engine turbine over-temperature occurrences, turbine time-temperature index, and a manually resettable flag which sets on occurrence of a turbine over-temperature event. These integrally controlled displays provide a comprehensive indication of the cumulative duty performed by the gas turbine engine.
49 Citations
10 Claims
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1. A history recorder for providing a record of the duty performed by a gas turbine wherein said recorder includes a plurality of integrally controlled displays each providing a display of a unique factor determinative of the duty performed by the engine, the invention comprising:
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means for displaying accumulated engine run time; means for generating an engine speed signal indicative of engine speed; and comparator means for comparing said engine speed signal with first and second reference speed signals, said first reference speed signal being indicative of a reference speed greater than said second reference speed, said comparator means operative to provide an output signal initiated in response to a comparison of said first reference signal with said engine speed signal and terminated in response to a comparison of said second reference signal with said engine speed signal, said engine run time display means providing a run time indication in response to said output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. For use in a history recorder for providing a record of the duty of a gas turbine engine wherein said recorder includes means for providing a display of accumulated engine run time over a speed range defined by an upper speed and a lower speed, means for displaying the number of engine starts, means for displaying the number of turbine over-temperature occurrences and means for displaying an index representative of the integrated value of turbine temperature and running time, the invention wherein said accumulated engine run time display means comprises:
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means for generating a gas generator speed signal; discriminator means for converting said speed signal to an analogue signal; a reference voltage corresponding to said upper speed; comparator means for comparing said discriminator voltage with said reference voltage and generating an output when said discriminator voltage exceeds said reference voltage; feedback means for transmitting said comparator output to reduce the reference voltage to a value corresponding to said lower speed range whereby said comparator output signals are removed when said discriminator voltage falls below the reduced reference voltage; power supply means; digital counter means for accumulating elapsed time when connected to said power supply means; and relay means activated by said comparator output for connecting the power supply to the digital counter whereby engine run time is accumulated in said digital counter during the time signals are present at said comparator output. - View Dependent Claims (9, 10)
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Specification