초록 ▼

A compressor air bleed override control system is provided to bleed interstage air from the compressor of an aircraft turbine engine under the conditions during which a compressor instability, such as surge, is likely to occur. The override system includes an override valve control that is in commun

A compressor air bleed override control system is provided to bleed interstage air from the compressor of an aircraft turbine engine under the conditions during which a compressor instability, such as surge, is likely to occur. The override system includes an override valve control that is in communication with an altitude sensor to make the system operative above a preselected pressure altitude, but inoperative below the selected pressure altitude. The altitude sensor is in communication with the engine fuel control power lever, which is an indirect sensor of compressor speed, such that at speeds corresponding to a slow deceleration from a sufficiently high altitude, the compressor bleed value will rapidly open. The system further measures the rate of movement of the power lever so that small but sufficiently rapid movements of the power lever, which are sustained for a selected period of time, will also cause the compressor bleed valve to open quickly. The period of time during which the bleed valve remains open is a function of the rate of movement of the power lever.

대표청구항 ▼

In an aircraft turbine engine having a multistage compressor, at least one bleed valve for bleeding air from the compressor in accordance with a schedule of engine control operating conditions, and a power lever for controlling fuel flow and compressor speed, a compressor air bleed override control

In an aircraft turbine engine having a multistage compressor, at least one bleed valve for bleeding air from the compressor in accordance with a schedule of engine control operating conditions, and a power lever for controlling fuel flow and compressor speed, a compressor air bleed override control system for preventing compressor surge, said override control system comprising: override valve control means for rapidly opening the bleed valve; power lever sensing means in communication with said power lever and said override valve control means for sensing power lever parameters that are anticipative of compressor surge and causing said override valve control means to open said bleed valve in response to said parameters; and altitude pressure sensing means in communication with said override valve control means and said power lever sensing means for sensing altitude and preventing said override valve control means from opening said bleed valve below a preselected altitude, whereby when the aircraft turbine engine is above the preselected altitude the power lever sensing means senses power lever parameters that are anticipative of compressor surge and causes the override valve control means to rapidly open the bleed valve to release air from the compressor and prevent compressor surge.