System for controlling an energy supplied to an electrical circuit of a vehicle with hybrid motorization, comprising: - a heat engine; - an electrical circuit supplying the various functional organs of the vehicle; - an alternator-starter connected to the heat engine to extracting energy in order to supply said electric circuit; - at least one other driving source (10, 18) comprising a energy storer, said other driving source (10, 18) having two modes of actuation, a driving mode in which it supplies energy so as to deliver a traction or assistance torque to the heat engine and a generator mode in which it stores energy, via said energy storer, with a view to supplying said traction or assistance torque and/or supplying said electric circuit; the heat engine, the alternator-starter and the other driving source (10, 18) respectively supplying a heat engine torque, a torque (Cait) of the alternator-starter, and a traction torque or assistance intended to respond to an instantaneous demand for motive power from the driver, - an analysis and control means capable in particular of determine the torques of the alternator-starter, of the engine thermal and the other driving source (10, 18), characterized in that a priority torque threshold (Cprio) is predefined in the analysis and control means and in that, when the analysis and control means determines that the torque (Cait) of the alternator- starter is lower, in absolute value, than the priority torque (Cprio) by a recharging torque, the analysis and control means imposes on said other driving source (10, 18) to operate in mode generator so as to provide a torque at least equal to the recharging torque for the energy storer. - a heat engine; - an electrical circuit supplying the various functional organs of the vehicle; - an alternator-starter connected to the heat engine to extracting energy in order to supply said electric circuit; - at least one other driving source (10, 18) comprising a energy storer, said other driving source (10, 18) having two modes of actuation, a driving mode in which it supplies energy so as to deliver a traction or assistance torque to the heat engine and a generator mode in which it stores energy, via said energy storer, with a view to supplying said traction or assistance torque and/or supplying said electric circuit; the heat engine, the alternator-starter and the other driving source (10, 18) respectively supplying a heat engine torque, a torque (Cait) of the alternator-starter, and a traction torque or assistance intended to respond to an instantaneous demand for motive power from the driver, energy storer, said other driving source (10, 18) having two modes of actuation, a driving mode in which it supplies energy so as to deliver a traction or assistance torque to the heat engine and a generator mode in which it stores energy, via said energy storer, with a view to supplying said traction or assistance torque and/or supplying said electric circuit; the heat engine, the alternator-starter and the other driving source (10, 18) respectively supplying a heat engine torque, a torque (Cait) of the alternator-starter, and a traction torque or assistance intended to respond to an instantaneous demand for motive power from the driver, - an analysis and control means capable in particular of determine the torques of the alternator-starter, of the engine thermal and the other driving source (10, 18), characterized in that a priority torque threshold (Cprio) is predefined in the analysis and control means and in that, when the analysis and control means determines that the torque (Cait) of the alternator- starter is lower, in absolute value, than the priority torque (Cprio) by a recharging torque, the analysis and control means imposes on said other driving source (10, 18) to operate in mode generator so as to provide a torque at least equal to the recharging torque for the energy storer. determine the torques of the alternator-starter, of the engine thermal and the other driving source (10, 18), characterized in that a priority torque threshold (Cprio) is predefined in the analysis and control means and in that, when the analysis and control means determines that the torque (Cait) of the alternator- starter is lower, in absolute value, than the priority torque (Cprio) by a recharging torque, the analysis and control means imposes on said other driving source (10, 18) to operate in mode generator so as to provide a torque at least equal to the recharging torque for the energy storer.