Management system for the operation of an internal combustion engine of a motor vehicle

The system has a heat engine (1) supplied with different types of fuel. Gas inlet units (2) are connected at an inlet of the engine. Modification units (11) modify operating conditions of the inlet unit according to the type of the fuel supplied to the engine. The inlet units have a power driven throttle vale (7) controlled by a control unit according to control information of the engine transmitted by a determination unit (10).