Abstract: An electromechanical actuator for controlling a flow modulator which is pivotally mounted in a pipe to cause a rapidly variable head loss in a fluid flowing therein, the actuator being provided with a stator and a rotor. The rotor can move only through a predetermined angular sector by oscillating about an angular reference position, and a return device is provided for storing the kinetic energy of the rotor and flow modulator during angular deceleration of the rotor and at least partially returning the kinetic energy to the actuator during angular acceleration of the rotor.

Abstract: A circuit for regulating the air conditioning of premises that are stationary or mobile, the premises being air conditioned by means of a conditioning unit controlled by a corrector that receives on its inputs both a reference temperature magnitude and a magnitude representative of the temperature of the premises, the circuit including a member for non-linear and non-stationary simulation of the assembly constituted by the conditioning unit and by the premises, and wherein the corrector comprises means for handling saturation in such a manner as to take account of amplitude limitation in the signal for controlling the process and the model of the process. The invention is particularly applicable to regulating the air conditioning of rail vehicles.