The present invention is a fuel injection method for a compression-ignition internal-combustion engine running in single-fuel or multi-fuel mode. The engine has at least a cylinder (10), a piston (16) sliding in the cylinder, a combustion chamber (34) comprising two mixing zones (Z1, Z2) which are defined on one side by upper face of the piston comprising a projection extending in the direction of the cylinder head and located in a center of a concave bowl (48), a cylinder head (12) carrying fuel injection (30) projects liquid fuel (Fuel1) in at least two fuel jet sheets (36, 38) with different sheet angles (A1, A2), and intake (24, 26, 28) for an oxidizer and burnt gas exhaust (18, 20, 22).The method, in a single-fuel mode, injects liquid fuel (Fuel1) into lower zone (Z1) and/or upper zone (Z2) of the combustion chamber and, in a multi-fuel mode, provides in the chamber mixing of an oxidizer with another fuel (Fuel2) and of injection of liquid fuel (Fuel1) into lower zone (Z1) or both zones (Z1, Z2) of the combustion chamber.

The present invention relates to a compression-ignition direct-injection internal-combustion engine comprising at least a cylinder (10), a cylinder head (12) carrying fuel injection means (14) projecting the fuel in at least two fuel jet sheets (36, 38) with different sheet angles (A1, A2), a piston (16) sliding in this cylinder, a combustion chamber (34) delimited on one side by upper face (44) of the piston comprising a teat (48) extending in the direction of the cylinder head and arranged in the centre of a concave bowl (46) with at least two mixing zones (Z1, Z2), and piston cooling means (76) housed in the material of the piston.

According to the invention, the cooling means comprise at least one circumferential gallery (78, 82) concentric to piston bowl (46) and arranged opposite at least one mixing zone (Z1, Z2).

A ducted combustion system is disclosed. The ducted combustion system includes a combustion chamber bound by a flame deck surface of a cylinder head of an internal combustion engine and by a piston top surface of a piston disposed within the internal combustion engine. The system includes a fuel injector including one or more orifices, the one or more orifices injecting fuel into the combustion chamber as at least one fuel jet. The system includes at least one duct disposed within the combustion chamber between the flame deck surface and the piston top surface, the at least one duct including one or more structural tabs proximate to an outlet of the at least one duct and being disposed such that the at least one fuel jet, at least partially, enters one of the at least one duct upon being injected into the combustion chamber.

A ducted combustion system is disclosed. The ducted combustion system includes a combustion chamber bound by a flame deck surface of a cylinder head of an internal combustion engine and by a piston top surface of a piston disposed within the internal combustion engine. The system includes a fuel injector including one or more orifices, the one or more orifices injecting fuel into the combustion chamber as one or more fuel jets. The system includes one or more ducts disposed within the combustion chamber between the flame deck surface and the piston top surface, the one or more ducts being generally tubular shaped structures and being disposed such that each of the one or more fuel jets at least partially enters one of the one or more ducts upon being injected into the combustion chamber.

An injector nozzle of a fuel injector for an internal combustion engine comprises a valve needle, and a nozzle body extending along a longitudinal axis from a tip, at a proximal end, to an opposing distal end for connection to the fuel injector. The nozzle body is provided with a bore within which the valve needle is moveable; and a valve seat defined at a proximal end of the bore and transitioning into a sac that defines a sac volume. The valve needle is moveable relative to the valve seat to control fuel delivery through a first set of nozzle outlets and a second set of nozzle outlets. The valve needle includes a seat region and a fuel guiding region extending proximally from the seat region.

A fuel injection device includes a nozzle element, an injection hole forming member, and a valve element. The injection hole forming member includes a seat part having the seat surface, and a suck chamber formed on a front end part of the seat part, the suck chamber being a recess denting in the direction of heading from the seat surface toward a front end part. The suck chamber has a suck chamber injection hole from which a fuel is jetted toward the ignition plug.

A nozzle body of a fuel injector includes a proximal end, a distal end spaced apart from the proximal end, and at least one spray hole positioned at the distal end. The at least one spray hole includes an inlet having a first cross-sectional shape and an outlet having a second cross-sectional shape different from the first cross-sectional shape. In other embodiments, the nozzle body has a first row of spray holes and a second row of spray holes, and a cross-sectional shape of spray holes in the first row is different from the cross-sectional shape of spray holes in the second row.

An apparatus and method for injection of a pilot fuel and a gaseous fuel into an internal combustion engine, the method including injecting a quantity of pilot fuel, a quantity of pilot gaseous fuel and a main quantity of the gaseous fuel into the combustion chamber; igniting and burning the pilot fuel to create a pressure and temperature environment in the combustion chamber; igniting and burning the pilot quantity of the gaseous fuel due to the pressure and temperature environment in the combustion chamber due to the burning of the pilot fuel; and igniting and burning the main quantity of the gaseous fuel due to the pressure and temperature environment in the combustion chamber due to the burning of the pilot quantity of the gaseous fuel.