Power plants – Combustion products used as motive fluid
Patent
1987-10-14
1989-01-03
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
60 3929, 25112905, 318603, F02C 918
Patent
active
047947608
ABSTRACT:
An improved direct drive motorized actuator control for a bleed valve in a gas turbine engine is disclosed. Position information of the bleed valve is produced by processing of a velocity signal derived from sensing motion of the bleed valve into a synthetic position signal having a magnitude proportional to the number of pulses contained in the velocity signal and a sign which is a function of the direction of rotation. The movement of the bleed valve is controlled by a control signal which is a function of the difference between a valve positioning command and the synthetic position signal. The sign of the synthetic position signal is controlled as a function of the control signal. The synthetic position signal has a time constant which causes it to decay with time to prevent the accumulation of error in the system. The invention achieves precise control of the bleed valve without utilization of expensive absolute position feedback circuitry.
REFERENCES:
patent: 3307824 (1967-03-01), Weisheit
patent: 3659417 (1972-05-01), Grieb
patent: 3874407 (1975-04-01), Griswold
patent: 4258301 (1981-03-01), Kawa
patent: 4380893 (1983-04-01), Stokes et al.
patent: 4463300 (1984-07-01), Mayne et al.
Casaregola Louis J.
Sunstrand Corporation
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