HYDRAULIC ACTUATOR SYSTEM

摘要

The invention is directed to controlling a hydraulic actuation system (50) having at least one degree of freedom, a prime mover (101), at least one actuation module (110, 120, 130) and a controller (103), with each actuation module (110, 120, 130) including: an over-center variable displacement pump (112 and 113; 601; 801) having a power input connection configured to power the pump from the prime mover (101) and a displacement varying input for varying the displacement of the pump; a displacement varying actuator (111, 121, 131) configured to modulate the displacement varying input of the pump; an output actuator (115) in direct communication with the pump, the output actuator (115) configured to drive a corresponding degree of freedom; and at least one sensor (116, 126) establishing a feedback measurement that represents a force or motion of the output actuator (115).