Speed control for an automobile

In a speed control for an engine of an automobile having an accelerator pedal, a speed sensor, and a butterfly valve, which is capable of serving as a driving aid, the improvement comprising:

• a depressible return means for opposing, with a limited force equal to or greater than a predetermined value, the depression force exerted by the driver against the accelerator pedal as soon as the latter exceeds, in its position, a predetermined value;
• an electronic computer connected to means for selecting a reference speed and to means for display of said preselected reference speed;
• a potentiometer the movable part of which is dependent upon said accelerator pedal, and the output of which is connected to the electronic computer, the outputs of which are in turn connected to an electric motor which directly controls the angular displacements of the butterfly valve, in which the depressive force of said accelerator pedal corresponds to a first value over a given length of travel of said pedal, and to a second value, higher than the first, over the remaining travel of said accelerator pedal, creating a friction point at a given point in the travel of said accelerator pedal, corresponding to passage from a first depressive force to a second higher than the first, in which the displacements of said accelerator pedal are graduated in speed;
• a mechanical connection between said accelerator pedal and said butterfly valve, incorporating a control block, controlled by the electronic computer, wherein said control block includes an epicyclic train controlled by a motorized reduction gear, a recopy potentiometer, and a blade turning about the axis of symmetry of said epicyclic train.