초록 ▼

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 propor

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.

대표청구항 ▼

A system for controlling a bleed valve driven by a direct drive actuator in a gas turbine comprising: (a) means for generating a valve positioning command for causing the valve to move to a desired position; (b) means for controlling the operation of a direct drive actuator which opens and closes th

A system for controlling a bleed valve driven by a direct drive actuator in a gas turbine comprising: (a) means for generating a valve positioning command for causing the valve to move to a desired position; (b) means for controlling the operation of a direct drive actuator which opens and closes the bleed valve in response to a control signal applied thereto, the means for controlling causing the bleed valve to open when the control signal has a first sign and to close when the control signal has a second sign; (c) means for producing a velocity signal proportional to a sensed velocity of a movable element of the direct drive actuator which moves in opening or closing the bleed valve; (d) means, responsive to the velocity signal and to the control signal, for generating a synthetic position signal having a level proportional to the position of the movable element; and (e) means, responsive to the synthetic position signal and the valve positioning command, for generating the control signal, the control signal being proportional to the difference between the valve positioning command and the synthetic position signal and having a positive or negative sign.