The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 1989
Filed:
Oct. 14, 1987
Robert C White, La Mesa, CA (US);
Sunstrand Corporation, Rockford, IL (US);
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.