A device for pneumatic jack servo-controlled and method of control for that - ci

摘要

Process for controlling a device for pneumatic jack servo-controlled, comprising a maneuver of advance is made to move a piston (14) to a target position in which, by a control system (40), of the servo-valves (20, 30) individually connected to a pressure chamber (11) on the head and a pressure chamber (12) of the rod side of the cylinder (10), and a compression operation consisting in applying a compressive force required to the piston (14). During the operation of advance, the piston (14) begin to be driven, whereas the servovalve (20) on the head is open in the direction of the side of the admission of air and that the valve (30) of the side of the rod is open in the direction of the exhaust side. Then, the degree of opening of the valve (30) of the side of the rod is converted into a degree of opening as a function of a deviation of the instantaneous position with respect to the target position, and consequently the piston is necessary to slow down progressively as it approaches the target position.