It is an electronic device that regulates the march and the. The duration of the interruption determines the speed of the truck. It is soft and gradually adjustable. Compared with conventional control system using the collation of resistance, has the additional advantage that it exploits the electrical energy stored in the battery as this energy is dissipated not heating resistors. With no abruptness in the march, both the engine and the other mechanisms and the truck itself suffer less and therefore last longer. With the control by pulse control can also operate the machine with a near millimeter precision.