INTERNAL COMBUSTION ENGINE WITH GAS FUEL INJECTION Russian patent published in 2008 - IPC F02B43/00 

FIELD: motors and pumps.

SUBSTANCE: invention relates to the engine engineering and, particularly, to internal combustion engines with gas fuel injection. The invention allows for the designing internal combustion engine operating on gas fuel. The engine characteristics, efficiency, reliability and lifetime correspond to the similar characteristics of the equivalent engine operating on liquid fuel with diesel cycle while reducing harmful emissions amounts, solid particles and nitric oxide, in particular. Fuel-fed internal combustion engine includes, at least one combustion chamber in cylinder form and piston being installed so that it can move in reciprocal direction. The cylinder head closes up the end of the said cylinder. The ignition unit is placed in combustion chamber with one of unit's ends. The ignition unit includes igniter with heated element ensuring that surface is heated, and cup, which surrounds igniter and creates shielded space between igniter and cup. Fuel injection valve is installed inside the chamber so that it can supply ignited gas fuel into combustion chamber in the form of sprayed fuel. Each jet is sprayed from one fuel injecting openings. At least, one of the aforesaid fuel injecting openings is situated so that it can direct fuel jet, i.e. initiating fuel jet to a special jet receiving point being on the surface of cup. At least, one through inlet port is made in the cup within the vicinity of the above jet receiving point, and connects shielded space with combustion chamber in a way that when initiating fuel jet achieves the above jet receiving point, the part of ignited gas fuel contained in the initiating jet, gets the shielded space though inlet port. At least, one though outlet port is made in the cup. Outlet port is located so that ignited air-gas fuel mixture leaking from shielded space could be directed to the previously mentioned fuel jets near fuel injection valve. The end of heated element is situated at no more than 3 mm distance from inlet port axis. The cup limits the flow between shielded space and combustion chamber in a way that ignited gas fuel burning inside shielded space creates higher pressure than those available inside combustion chamber. This pressure is sufficiently high to release burning air-gas fuel mixture into combustion chamber and to contact with the abovementioned fuel jets. The invention also provides for the method of operating cycle in the internal combustion engine on gas fuel.

EFFECT: development of internal combustion engine on gas fuel with characteristics, efficiency, reliability and life time corresponding to similar characteristics of equivalent engine operating on liquid fuel with diesel cycle, while reducing harmful emissions, and particularly, solid particles and nitric oxide.

46 cl, 9 dwg