Redundant two stage electro-hydraulic servo actuator control

摘要

A flight control system (10) includes a dual stage actuator (12) for moving a control surface (14). Each stage (16,18) includes several control valves (20,22,24,26,28,30) that are controlled independently to provide a desired redundancy. A flight controller (32,34,36) generates a position command that is indicative of the position desired for the control surface. A first communication link (38) is provided between several flight controllers (32,34,36) to share information. Each of the flight controllers forwards the position command to actuator remote processing unit (40,42,44). The actuator remote processing unit receive position commands and generate a command signal that controls movement of the actuator (12) using the control valves. Each of the actuator remote processing units is linked through a second communication link (46). Feedback and balancing of the different control valves is provided by the visibility accorded each actuator remote processing unit by the second communication link.