Bleed modulation for transient engine operation

摘要

A gas turbine engine control system modulates a compressor bleed valve between full open and full closed during transient engine operation as a function of the rate of change of compressor speed biased by flight conditions, such as altitude, and corrected for engine power level. A hysteresis construct may be applied to the rate of change of compressor speed before such rate is used to determine the new bleed valve position.