Abstract: An electrically controlled hydraulic actuating system includes a servocontrol including a cylinder, a piston dividing the cylinder into two chambers each provided with a hydraulic connection port, a control valve connected to a hydraulic circuit. A two-way hydraulic pump is driven in rotation by an electric motor driven by power electronics. A switching device allows the connection ports of the chambers to be connected either to the control valve or the pump. The switching device connects the hydraulic connection ports both to the control valve and the pump, so as to allow the servocontrol to be supplied the sum of the hydraulic power delivered by the hydraulic circuit and the hydraulic power generated by the pump actuated by the electric motor.

Abstract: The invention concerns a hydraulic circuit (17) and a control valve (18) dimensioned to be capable of providing the greater part the control surface (3) actuating, which requires less power than the system maximum performances Moreover, a bi-directional hydraulic pump (23), driven by an electric motor (24), can supply backup power which added to said circuit (17) power can ensure said maximum performances.