Claims
- 1. A method of discriminating between spurious and genuine surges in a gas turbine engine comprising the steps of:
a) receiving an engine speed, signal over a global engine surge investigation region having a plurality of temporal regions in which engine surge events can occur; b) identifying a specific temporal region of the global engine surge investigation region in which an engine surge event occurs; c) incrementing a surge counter corresponding to the specific temporal region of the global engine surge investigation region in which the engine surge event occurred; d) identifying the specific temporal regions of the global engine surge investigation region in which no engine surge event occurred; e) decrementing a surge counter corresponding to each specific temporal region of the global engine surge investigation region in which no engine surge event occurred; and f) enabling a surge avoidance flag when a surge counter corresponding to one of the temporal regions reaches a predetermined value.
- 2. A method according to claim 1, wherein the step of incrementing a surge counter corresponding to a temporal region of the global engine surge investigation region in which the engine surge event occurred comprises incrementing said surge counter by a magnitude of two.
- 3. A method according to claim 1, wherein the step of decrementing a surge counter corresponding to each temporal region of the global engine surge investigation region in which no engine surge event occurred comprises decrementing said surge counter by a magnitude of one.
- 4. A method according to claim 1, wherein the step of enabling a surge avoidance flag includes enabling a surge avoidance flag when the magnitude of a surge counter is at least equal to five.
- 5. A method according to claim 1, further comprising the step of resetting each of the surge counters when power to an engine control unit goes to zero.
- 6. A method according to claim 1, further comprising the step of providing a global surge investigation region with five temporal regions in which engine surge events can occur.
- 7. A method according to claim 1, further comprising the step of modifying baseline engine control schedules in response to an engine surge avoidance flag.
- 8. A method according to claim 7, further comprising the step of storing a modification to baseline engine control schedules in non-volatile memory for subsequent application.
- 9. A method of discriminating between spurious and genuine surges in a gas turbine engine comprising the steps of:
a) receiving an engine speed signal over a global engine surge investigation region having a plurality of temporal regions in which engine surge events can occur; b) identifying a specific temporal region of the global engine surge investigation region in which an engine surge event occurs; c) incrementing a surge counter corresponding to the specific temporal region of the global engine surge investigation region in which the engine surge event occurred by a first magnitude; d) identifying the specific temporal regions of the global engine surge investigation region in which no engine surge event occurred; e) decrementing a surge counter corresponding to each temporal region of the global engine surge investigation region in which no engine surge event occurred by a second magnitude that is less than the first magnitude; and f) enabling a surge avoidance flag when the magnitude of a surge counter corresponding to one of the temporal regions reaches a predetermined value.
- 10. A method according to claim 9, wherein the step of incrementing a surge counter corresponding to a temporal region of the global engine surge investigation region in which the engine surge event occurred comprises incrementing said surge counter by a magnitude of two.
- 11. A method according to claim 9, wherein the step of decrementing a surge counter corresponding to each temporal region of the global engine surge investigation region in which no engine surge event occurred comprises decrementing said surge counter by a magnitude of one.
- 12. A method according to claim 9, wherein the step of enabling a surge avoidance flag includes enabling a surge avoidance flag when the magnitude of a surge counter has reached a value that is at least equal to five.
- 13. A method according to claim 9, further comprising the step of resetting each of the surge counters when power to an engine control unit goes to zero.
- 14. A method according to claim 9, further comprising the step of providing a global surge investigation region with five temporal regions in which engine surge events can occur.
- 15. A method according to claim 9, further comprising the step of modifying baseline engine control schedules in response to an engine surge avoidance flag.
- 16. A method according to claim 15, further comprising the step of storing a modification to baseline engine control schedules in non-volatile memory for subsequent application.
- 17. A method of discriminating between spurious and genuine surges in a gas turbine engine comprising the steps of:
a) receiving an engine speed signal over a global engine surge investigation region having a plurality of temporal regions in which engine surge events can occur; b) identifying a specific temporal region of the global engine surge investigation region in which an engine surge event occurs; c) incrementing a surge counter corresponding to the temporal region of the global engine surge investigation region in which the engine surge event occurred by a magnitude of two; d) identifying the temporal regions of the global engine surge investigation region in which no engine surge event occurred; e) decrementing a surge counter corresponding to each temporal region of the global engine surge investigation region in which no engine surge event occurred by a magnitude of one; and f) enabling a surge avoidance flag when the magnitude of the surge counter corresponding to one of the temporal regions has reached a predetermined value.
- 18. A method according to claim 17, wherein the step of enabling a surge avoidance flag includes enabling a surge avoidance flag when the magnitude of a surge counter has reached a value that is at least equal to five.
- 19. A method according to claim 17, further comprising the step of resetting each of the surge counters when power to an engine control unit goes to zero.
- 20. A method according to claim 17, further comprising the step of providing a global surge investigation region with five temporal regions in which engine surge events can occur.
- 21. A method according to claim 17, further comprising the step of modifying baseline engine control schedules in response to an engine surge avoidance flag.
- 22. A method according to claim 21, further comprising the step of storing a modification to baseline engine control schedules in non-volatile memory for subsequent application.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The subject application claims the benefit of priority to U.S. Provisional Patent Application Serial No. 60/335,498, which was filed on Nov. 15, 2001, the disclosure of which is incorporated herein by reference in its entirety.
Provisional Applications (1)
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Number |
Date |
Country |
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60335498 |
Nov 2001 |
US |