초록 ▼

A pressure sensor (12) is located in the compressor stage of a gas turbine engine (10) to provide a pressure signal (PR1) that shows the compressor flow characteristics. The pressure signal (PR1) is applied to a bandpass filter (16) with roll-offs above and below N2. The difference between the filte

A pressure sensor (12) is located in the compressor stage of a gas turbine engine (10) to provide a pressure signal (PR1) that shows the compressor flow characteristics. The pressure signal (PR1) is applied to a bandpass filter (16) with roll-offs above and below N2. The difference between the filter output and a stored value for the pressure signal is integrated, and compressor bleed valves (18) are opened if the integral exceeds a stored threshold. The health of a compressor stage is determined by analyzing the magnitude of compressor pressure variations at N2 while accelerating the engine and by comparing the magnitude with values obtained from a compressor with a known stall margin.

대표청구항 ▼

[ What is claimed is:] [1.] A controller for a rotary compressor having a compressor bleed valve, characterized by:first means for providing a first time varying signal manifesting compressor pressure,second means for providing a second signal manifesting the magnitude of said first signal between a

[ What is claimed is:] [1.] A controller for a rotary compressor having a compressor bleed valve, characterized by:first means for providing a first time varying signal manifesting compressor pressure,second means for providing a second signal manifesting the magnitude of said first signal between a first frequency that is less than compressor rotational speed and a second frequency that is greater than or equal to said compressor rotational speed; andsignal processing means for providing a first processor signal from said second signal that manifests a difference between the magnitude of said second signal and a stored value for said second signal, for integrating said difference to produce a control signal, and for producing a bleed signal to open the compressor bleed valve if said control signal exceeds threshold value.