Reciprocating actuator with closed loop servocontrol

A reciprocating actuator comprising:

• a rack,
• at least one moving element guided relative to the rack so as to be able to be displaced with reciprocating motion relative to said rack,
• a device for driving the moving element in at least one direction, known as the driving direction,
• means of returning the moving element in a direction opposing the driving direction,
• at least one sensor for detecting the position of the moving element relative to the rack, capable of delivering a position signal representative of at least the position of said moving element in the vicinity of its extreme end of displacement position in the driving direction,
• a servocontrol adapted to adjust and deliver, for each displacement cycle of the moving element in the driving direction, a control signal of the driving device, the value thereof being determined for each cycle according to the difference between an extreme position adopted previously by the moving element in the driving direction as determined by the position signal and a predetermined extreme limit position of the moving element in its displacement in the driving direction,
• wherein the servocontrol:
• comprises at least one measuring chain designed to deliver for each displacement cycle of the moving element in the driving direction, at least one signal, known as the correction signal (S5), representative of the difference between the energy imparted on the moving element by the driving device during at least one cycle preceding that in which the control signal is applied, and the energy, known as nominal energy, to be imparted on this moving element to displace it exactly to its extreme set-point position,
• is designed to adjust for each cycle the control signal according to said correction signal (S5),
• and is designed to deliver a control signal, said control signal interrupting the driving device before the moving element arrives in the end of travel position in the driving direction.