Direct drive motorized acutator control for bleed valves
US4794760A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Oct 14, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2220/50
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.