An electrical control system for distinguishing between an electrical fault and a shaft shear condition in a gas turbine engine, the control system including, in one aspect, a detection circuit including: two or more probes, each probe including an associated resistor having a predetermined range of
An electrical control system for distinguishing between an electrical fault and a shaft shear condition in a gas turbine engine, the control system including, in one aspect, a detection circuit including: two or more probes, each probe including an associated resistor having a predetermined range of resistance, and each probe being disposed in the engine adjacent a rotary mounted shaft component, where mechanical interference between one or more of the probes and the shaft component renders the associated resistor substantially non-conductive; sensor processor(s) in communication with each probe, determining a probe operational status based on a measured resistance to current conducted through each probe, and generating a fault code when the measured resistance of at least one of the plurality of probes is not within the predetermined range of resistance.
대표청구항▼
1. A circuit useful for distinguishing between an electrical fault and a shaft shear failure in a gas turbine engine, the circuit comprising: a plurality of probes, each probe associated with a respective resistor having a predetermined range of resistance, and each probe being disposed in an engine
1. A circuit useful for distinguishing between an electrical fault and a shaft shear failure in a gas turbine engine, the circuit comprising: a plurality of probes, each probe associated with a respective resistor having a predetermined range of resistance, and each probe being disposed in an engine adjacent a rotary mounted shaft component, whereby mechanical interference between any of the plurality of probes and the shaft component renders the corresponding associated resistor substantially non-conductive; andat least one sensor processor configured to determine an operational status of each probe, based on a measured resistance to current conducted through each probe, and to generate a fault code when the measured resistance associated with at least one of the plurality of probes is not within the predetermined range of resistance;wherein the fault code generated by the at least one sensor processor is indicative of a shaft shear failure when the measured resistance to current conducted through each of the plurality of probes is substantially infinite;wherein: when the measured resistance associated with at least one probe is not within the predetermined range of resistance; andwhen the measured resistance associated with at least one other probe is within the corresponding predetermined range of resistance;the fault code generated by the sensor processor is an engine warning code. 2. The circuit of claim 1 wherein: when the measured resistance associated each of the plurality of probes is not within the corresponding predetermined ranges of resistance;the fault code generated by the sensor processor is an engine shutdown code. 3. The circuit of claim 1 wherein when the measured resistance is substantially equal to zero, the sensor processor determines the probe operational status as one of: short circuit and probe failure. 4. The circuit of claim 1 wherein when the measured resistance is one of: greater than zero and less than the corresponding predetermined range of resistance; and greater than the corresponding predetermined range of resistance and less than substantially infinite resistance;the sensor processor determines the probe operational status as: circuit damage. 5. The circuit of claim 1 wherein when a measured resistance is substantially infinite, the sensor processor determines a probe operational status as one of: open circuit; and probe failure. 6. The circuit of claim 1, comprising a motor drive processor in communication with the at least one sensor processor. 7. The circuit of claim 1, comprising a fuel shutdown circuit in communication with the at least one sensor processor. 8. The circuit of claim 7, wherein the fuel shutdown circuit provides for shutdown of a fuel pump comprising a plurality of drive motors. 9. The circuit of claim 1, comprising at least one opto-isolator in communication with the at least one sensor processor. 10. The circuit of claim 9, comprising four opto-isolators in communication with the at least one sensor processor. 11. The circuit of claim 1 comprising two probes. 12. The circuit of claim 11 wherein each probe is associable by the at least one sensor processor with a probe operational status selected from the group consisting of: no-fault; short circuit; open circuit; and circuit damage. 13. A turbine engine comprising a circuit useful for distinguishing between an electrical fault and a shaft shear failure in a gas turbine engine, the circuit comprising: a plurality of probes, each probe associated with a respective resistor having a predetermined range of resistance, and each probe being disposed in an engine adjacent a rotary mounted shaft component, whereby mechanical interference between any of the plurality of probes and the shaft component renders the corresponding associated resistor substantially non-conductive; andat least one sensor processor configured to determine an operational status of each probe, based on a measured resistance to current conducted through each probe, and to generate a fault code when the measured resistance associated with at least one of the plurality of probes is not within the predetermined range of resistance;wherein the fault code generated by the at least one sensor processor is indicative of a shaft shear failure when the measured resistance to current conducted through each of the plurality of probes is substantially infinite;wherein: when the measured resistance associated with at least one probe is not within the predetermined range of resistance; andwhen the measured resistance associated with at least one other probe is within the corresponding predetermined range of resistance;the fault code generated by the sensor processor is an engine warning code. 14. A method of monitoring shaft shear failure in a gas turbine engine, the method performed by one or more processors, each processor communicatively linked with at least one of a plurality of probes, each probe comprising a respective resistor and being configured to provide a substantially open circuit in the event of a whole or partial shaft shear failure; the method comprising: comparing a measured resistance of each of the plurality of probes with a corresponding predetermined range of resistance; andgenerating a fault code when at least one of the measured resistances associated with at least one of the plurality of probes is not within the corresponding predetermined range of resistance;wherein the fault code generated is indicative of a shaft shear failure when the measured resistance to current conducted through each of the plurality of probes is substantially infinite;wherein: when the measured resistance of at least one probe is not within the predetermined range of resistance; andwhen the measured resistance of at least one other probe is within the corresponding predetermined range of resistance,generating an engine warning code. 15. The method of claim 14, comprising: when the measured resistance of each of the plurality of probes is not within the corresponding predetermined ranges of resistance, generating an engine shutdown code. 16. The method of claim 14, comprising: when the measured resistance of at least one of the probes is substantially equal to zero, generating at least one of a short circuit code and a probe failure. 17. The method of claim 14, comprising, when the measured resistance of at least one of the plurality of probes is one of: greater than zero and less than the corresponding predetermined range of resistance; and greater than the corresponding predetermined range of resistance and less than substantially infinite resistance;generating a circuit damage code. 18. The method of claim 14, comprising, based on the comparing a measured resistance of each of the plurality of probes with a corresponding predetermined range of resistance: providing to a motor drive processor communicatively linked to the at least one processor a control signal. 19. The method of claim 18, wherein the control signal comprises a signal adapted to cause shutdown of a fuel system. 20. The method of claim 19, wherein the fuel system comprises a fuel pump driven by a plurality of motors.
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이 특허에 인용된 특허 (23)
Jensen Jorgen (Gentofle MA DKX) Michel Gregory C. (Framingham MA), Acceleration responsive transducers.
Richards Paul N. (Knebworth GB2) Douglas Michael C. (Wormley GB2) Snowden David C. (Cockfosters GB2) Proctor Kenneth W. (Hornchurch GB2) Perks Malcolm P. (Abbots Landing GB2), Shaft failure monitoring system using angled rotating teeth and phase detection.
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