[특허]Torque control for starting system

Hamilton Sundstrand Corporation

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Torque control for starting system

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02C-007/275 F02C-007/26
미국특허분류(USC)	060/788; 060/786
출원번호	US-0253971 (2005-10-19)
등록번호	US-7448220 (2008-11-11)
발명자 / 주소	Schmidt,Dennis E. Ripley,David L. Cogsdill,Lawrence A.
출원인 / 주소	Hamilton Sundstrand Corporation
대리인 / 주소	Mican,Stephen G.
인용정보	피인용 횟수 : 11 인용 특허 : 2

초록

A start system for a gas turbine engine delivers starter current according to a schedule selected according to measured rotational speed and oil temperature of the gas turbine engine.

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What is claimed is: 1. A start system for a gas turbine engine to deliver starting current according to a schedule selected according to measured rotational speed and oil temperature of the gas turbine engine, comprising: a baseline starting current signal level source that produces a baseline starting current level signal that represents a baseline starting current needed to start the engine; an engine oil temperature sensor that produces an oil temperature signal representing oil temperature for the gas turbine engine; an engine rotational speed sensor that produces an engine rotational speed signal representing rotational speed of the engine; an offset current selector that produces an offset current signal level that represents an offset current needed to add to the baseline starting current to start the gas turbine engine based upon the engine oil temperature signal and the engine rotational speed signal; and a summer that combines the offset current selector output with the baseline current starting signal to produce a compensated current starting command signal that shifts in current level according to engine oil temperature and engine rotational speed conditions. 2. The start system of claim 1, wherein the offset current signal level varies between a non-compensating level and a compensating level. 3. The start system of claim 2, wherein the offset current signal level reaches the compensating level when the oil temperature signal is less than a predetermined value and the engine rotational speed signal is less than a predetermined value. 4. The start system of claim 3, wherein the offset current selector further comprises a low oil temperature detector that produces a low oil temperature signal that has a level to represent engine oil temperature less than the predetermined value. 5. The start system of claim 4, wherein the offset current selector further comprises a low engine speed detector that produces a low engine speed detector signal that has a level to represent engine rotational speed less than the predetermined value. 6. The start system of claim 5, wherein the low oil temperature signal has a logic level "1" to represent engine oil temperature less than the predetermined value, the low engine speed detector signal that has a logic level "1" to represent engine rotational speed less than the predetermined value, and the offset current selector further comprises an AND gate with inputs coupled to the low oil temperature signal and the low engine speed detector signal to produce an AND gate output signal that has a logic "1" level when both the engine oil temperature and the engine rotational speeds are less than their respective predetermined values. 7. The start system of claim 6, wherein the offset current selector further comprises a relay that switches its output between a non-compensating current level and a compensating current level and the AND gate activates the relay with the AND gate output signal when it has a logic "1" level. 8. The start system of claim 3, wherein the predetermined value of oil temperature is within a range of approximately 0 to-20 degrees C. 9. The start system of claim 8, wherein the predetermined value of oil temperature is approximately 0 degrees C. 10. The start system of claim 3, wherein the predetermined value of engine rotational speed is within a range of approximately 5 to 20 percent of maximum engine rotational speed. 11. The start system of claim 10, wherein the predetermined value of engine rotational speed is approximately 10 percent of maximum engine rotational speed. 12. The start system of claim 1, further comprising an analogue-to-digital (A/D) converter that converts the compensated current starting command signal to a digital compensated current starting command signal. 13. The start system of claim 12, further comprising a pulse width modulator (PWM) that converts the digital compensated current starting command signal to a PWM starting current control signal that controls a power starter controller for the gas turbine engine. 14. A start system for a gas turbine engine to deliver starting current to a starter for the engine by way of a power starter controller according to a schedule selected according to measured rotational speed and oil temperature of the gas turbine engine, comprising: a baseline starting current signal level source that produces a baseline starting current level signal that represents a baseline starting current needed to start the engine; an engine oil temperature sensor that produces an oil temperature signal representing oil temperature for the gas turbine engine; an engine rotational speed sensor that produces an engine rotational speed signal representing rotational speed of the engine; an offset current selector that produces an offset current signal level that represents an offset current needed to add to the baseline starting current to start the gas turbine engine based upon the engine oil temperature signal and the engine rotational speed signal; a summer that combines the offset current selector output with the baseline current starting signal to produce a compensated current starting command signal that shifts in current level according to engine oil temperature and engine rotational speed conditions; an analogue-to-digital (A/D) converter that converts the compensated current starting command signal to a digital compensated current starting command signal; and a pulse width modulator (PWM) that converts the digital compensated current starting command signal to a PWM starting current control signal that controls the power starter controller for the gas turbine engine starter. 15. The start system of claim 14, wherein the offset current signal level varies between a non-compensating level and a compensating level. 16. The start system of claim 15, wherein the offset current signal level reaches the compensating level when the oil temperature signal is less than a predetermined value and the engine rotational speed signal is less than a predetermined value. 17. The start system of claim 16, wherein the offset current selector further comprises a low oil temperature detector that produces a low oil temperature signal that has a level to represent engine oil temperature less than the predetermined value. 18. The start system of claim 17, wherein the offset current selector further comprises a low engine speed detector that produces a low engine speed detector signal that has a level to represent engine rotational speed less than the predetermined value. 19. The start system of claim 18, wherein the low oil temperature signal has a logic level "1" to represent engine oil temperature less than the predetermined value, the low engine speed detector signal has a logic level "1" to represent engine rotational speed less than the predetermined value, and the offset current selector further comprises an AND gate with inputs coupled to the low oil temperature signal and the low engine speed detector signal to produce an AND gate output signal that has a logic "1" level when both the engine oil temperature and the engine rotational speeds are less than their respective predetermined values. 20. The start system of claim 19, wherein the offset current selector further comprises a relay that switches its output between a non-compensating current level and a compensating current level and the AND gate activates the relay with the AND gate output signal when it has a logic "1" level. 21. The start system of claim 16, wherein the predetermined value of oil temperature is within a range of approximately 0 to-20 degrees C. 22. The start system of claim 21, wherein the predetermined value of oil temperature is approximately 0 degrees C. 23. The start system of claim 16, wherein the predetermined value of engine rotational speed is within a range of approximately 5 to 20 percent of maximum engine rotational speed. 24. The start system of claim 23, wherein the predetermined value of engine rotational speed is approximately 10 percent of maximum engine rotational speed. 25. A gas turbine engine with an electric starter and a start system to deliver starting current to the starter by way of a power starter controller according to a schedule selected according to measured rotational speed and oil temperature of the gas turbine engine, comprising: a baseline starting current signal level source that produces a baseline starting current level signal that represents a baseline starting current needed to start the engine; an engine oil temperature sensor that produces an oil temperature signal representing oil temperature for the gas turbine engine; an engine rotational speed sensor that produces an engine rotational speed signal representing rotational speed of the engine; an offset current selector that produces an offset current signal level that represents an offset current needed to add to the baseline starting current to start the gas turbine engine based upon the engine oil temperature signal and the engine rotational speed signal; a summer that combines the offset current selector output with the baseline current starting signal to produce a compensated current starting command signal that shifts in current level according to engine oil temperature and engine rotational speed conditions; an analogue-to-digital (A/D) converter that converts the compensated current starting command signal to a digital compensated current starting command signal; and a pulse width modulator (PWM) that converts the digital compensated current starting command signal to a PWM starting current control signal that controls the power starter controller for the gas turbine engine starter. 26. The gas turbine engine of claim 25, wherein the offset current signal level varies between a non-compensating level and a compensating level. 27. The gas turbine engine of claim 26, wherein the offset current signal level reaches the compensating level when the oil temperature signal is less than a predetermined value and the engine rotational speed signal is less than a predetermined value. 28. The gas turbine engine of claim 27, wherein the offset current selector further comprises a low oil temperature detector that produces a low oil temperature signal that has a level to represent engine oil temperature less than the predetermined value. 29. The gas turbine engine of claim 28, wherein the offset current selector further comprises a low engine speed detector that produces a low engine speed detector signal that has a level to represent engine rotational speed less than the predetermined value. 30. The gas turbine engine of claim 29, wherein the low oil temperature signal has a logic level "1" to represent engine oil temperature less than the predetermined value, the low engine speed detector signal has a logic level "1" to represent engine rotational speed less than the predetermined value, and the offset current selector further comprises an AND gate with inputs coupled to the low oil temperature signal and the low engine speed detector signal to produce an AND gate output signal that has a logic "1" level when both the engine oil temperature and the engine rotational speeds are less than their respective predetermined values. 31. The gas turbine engine of claim 30, wherein the offset current selector further comprises a relay that switches its output between a non-compensating current level and a compensating current level and the AND gate activates the relay with the AND gate output signal when it has a logic "1" level. 32. The gas turbine engine of claim 27, wherein the predetermined value of oil temperature is within a range of approximately 0 to-20 degrees C. 33. The gas turbine engine of claim 32, wherein the predetermined value of oil temperature is approximately 0 degrees C. 34. The gas turbine engine of claim 27, wherein the predetermined value of engine rotational speed is within a range of approximately 5 to 20 percent of maximum engine rotational speed. 35. The gas turbine engine of claim 34, wherein the predetermined value of engine rotational speed is approximately 10 percent of maximum engine rotational speed.

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Torque control for starting system

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Torque control for starting system

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이 특허에 인용된 특허 (2)

이 특허를 인용한 특허 피인용횟수: 11

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