Patent ID: 7376504
Filing Date: 2008-05-20
Classification: F02C,F04D,F05D,G01M,Y02B

Abstract:
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 operating regions in which engine surge events can occur; b) identifying an operating region of the global engine surge investigation region in which an engine surge event occurs; c) incrementing a surge counter corresponding to the specific operating region of the global engine surge investigation region in which the engine surge event occurred; d) identifying the specific operating regions of the global engine surge investigation region in which no engine surge event occurred; e) decrementing a surge counter corresponding to each specific operating 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 operating regions reaches a predetermined value.