Surge detection system using engine signature

Details Surge detection system using engine signature Surge detection system using engine signature

1994-01-26

1998-03-10

Teska, Kevin J.

Boots, shoes, and leggings

36443101, 364494, 36455101, 60 3903, 60 39281, 60 3927, 731173, 731172, 415 17, 415 27, G06G 770

Patent

active

057268916

ABSTRACT:
A method of, and a system for, detecting an occurrence of a surge in a gas turbine engine. The method includes steps, executed during consecutively occurring time periods, of: obtaining filtered derivatives of first and second engine operating characteristics; comparing the filtered derivatives of the first and the second engine operating characteristics to first and second threshold values, respectively; and incrementing a count only if both of the filtered derivatives exceed their respective threshold values. Otherwise, a next step decrements the count if one or both of the filtered derivatives do not exceed their respective threshold values. The method further includes a step of indicating a surge condition only if the count is equal to a predetermined value that is greater than unity. In a presently preferred embodiment of this invention the engine is a turbofan engine, the first engine operating characteristic is fan speed, and the second engine operating characteristic is exhaust gas temperature.

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patent: 4618856 (1986-10-01), Antonazzi
patent: 5012637 (1991-05-01), Dubin et al.
patent: 5051918 (1991-09-01), Parsons

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