Patent ID: 9228501
Filing Date: 2016-01-05
CPC Classification: F02C,F04D,F05D

Claim Text:
1. A method for controlling a position of a bleed valve of a gas turbine engine, comprising: a) determining an onset of an off-load transient; b) determining a value representative of a turbine rotor inlet temperature, a value representative of an exhaust outlet temperature, and an amount of time elapsed since onset of the off-load transient; c) determining a first provisional bleed valve command position value based on the value representative of the turbine rotor inlet temperature; d) determining a second provisional bleed valve command position based on the value representative of the exhaust outlet temperature; e) determining a third provisional bleed valve command position based on the time elapsed since onset of the off-load transient; f) determining which of the first, second, and third provisional bleed valve command positions is associated with a lowest relative value and selecting the provisional bleed valve command position associated with the lowest relative value; and g) adjusting the position of the bleed valve to match the selected bleed valve command position.