DIRECT-INJECTION ENGINE WITH SMALL NAPPE ANGLE AND PROCESSES ALLOWING SUCH AN ENGINE TO BE USED

摘要

The engine, comprising at least one cylinder with a head (1), a piston (5), inlet and exhaust valves (3, 4) and a combustion chamber between the cylinder head and recessed piston face, has an injector (6) which delivers fuel with a spray angle (a1) that is under or equal to 2Arctg CD/2F, where CD is the diameter of the cylinder and F is the distance between the point of origin of the fuel jets issuing from the injector and the position of the piston corresponding to a crankshaft angle of 50 deg from TDC. The angle (a2) of the central tip (7) of the piston face is selected according to the angle of the fuel spray and is designed so that the fuel is deflected outwards and vaporises before coming into contact with the cylinder wall.