TWO CYCLE INTERNAL COMBUSTION ENGINE WITH DIRECT FUEL INJECTION COMBUSTION SYSTEM

A two-cycle internal combustion engine is of the type having one cylinder (2), one piston (4) with connecting rod, one head (3) closing the cylinder (2) on the explosion chamber side, one crankcase (12) closing the cylinder (2) on the side opposing the explosion chamber, one spark plug (5) inserted in the head, and one burnt gas exhaust pipe (8) with inlet port opening onto the internal surface of the cylinder (2) near bottom dead center of the piston (4). One air input duct (6) with combustion chamber inlet port (13) is located near bottom dead center of the piston (4) and inlet ports are located cither in the cylinder (2) near the crankcase (12) or in the crankcase. One duct (7) lets lubrication oil into the air input duct (6) and one sensor (9) senses rotation speed and angular position of the drive shaft. One fuel injector (1) is inserted in the cylinder wall (2) with an inclination such that the fuel jet produced thereby penetrates into the combustion chamber and impact on the wall of the head (3) near the spark plug (5) and at a position such that the piston (4), at its top dead center, is placed between the injector (1) and the combustion chamber. A control unit (10), based on the signal output by the sensor (9), synchronizes the cyclic movement of the drive shaft with the sparking times of the spark plug (5) and the opening time of the injector (1), and also regulates the quantity of fuel injected upon each cycle of the engine based on rotation speed, engine load and acceleration regulation set by the user.