An internal combustion engine includes a combustion chamber formed by cooperation of a cylinder bore formed in a cylinder block, a cylinder head and a piston. A combustion ignition device is disposed in the combustion chamber and includes a nozzle defining a pre-chamber, a barrier discharge plasma igniter, including a tip portion disposed in the pre-chamber and a plurality of apertures disposed in the nozzle. The pre-chamber is in fluidic communication with the combustion chamber via the plurality of apertures. A controller is in communication with the engine and the barrier discharge plasma igniter.

A pre-chamber is formed between the front end of a spark plug (15) attached to the cylinder head (3) and a thin pre-chamber wall (11) sticking out from the inside wall surface of the cylinder head (3) to the inside of a main combustion chamber (5). The communication holes (13) communicating the inside of the sub chamber (12) and the inside of the main combustion chamber (5) are formed inside the thin pre-chamber wall (11). The thin pre-chamber wall (11) is formed into a shape with a cross-sectional area gradually decreasing from the inside wall surface of the cylinder head (3) toward the inside of the main combustion chamber (5) such as a conical shape, frustoconical shape, polygonal conical shape, or polygonal frustoconical shape. A ground side electrode portion of the spark plug (15) is positioned inside the gas pocket (18), and a discharge is caused between the center electrode (19) sticking out from the front end of the center electrode insulator (17) and the ground side electrode portion at the time of ignition.

An engine is provided. In one embodiment, the engine includes a precombustion chamber having a body, a secondary combustion chamber disposed at least partially in the body, and a plurality of passages configured to place the precombustion chamber in fluid communication with a main combustion chamber.

A method for starting a turbocompounded engine system having an internal combustion engine and a turbomachinery driving a load, the method comprising: mechanically disengaging the internal combustion engine from at least one of the load and/or the turbomachinery before starting the internal combustion engine. The engine is allowed to warm up and then the engine is re-engaged with the at least one of the load and the turbomachinery.

A system and method for combustion in an engine includes a combustion chamber, a prechamber, and a fluid injector. The prechamber extends from a first end to a second is fluidly connected to the combustion chamber through at least one port positioned at the first end of the prechamber. The fluid injector is configured to introduce a fluid into the prechamber following combustion of an air-fuel mixture within the prechamber and positioned to introduce the fluid into the prechamber at the second end of the prechamber.

A pre-chamber for a fuel injector is disclosed. The pre-chamber includes a cylindrical body member extending axially from a first end portion to a second end portion opposite to the first end portion. The pre-chamber further includes a bottom plate located proximal to the first end portion of the cylindrical body member. The pre-chamber also includes a sacrificial member extending axially outwards from the second end portion of the cylindrical body member.

Systems are provided for cooling combustion chamber gasses and increasing an amount of air entrained in an injected fuel spray. In one example, a cooling passage may be included in an internal combustion engine, the cooling passage positioned exterior to a cylinder bore of the engine and coupled to the cylinder bore at a first opening and a second opening. The cooling passage may receive gasses from the cylinder bore via the first opening, and may cool the gasses as they travel through the cooling passage before returning the gasses to the cylinder bore via the second opening.

A pre-chamber assembly of an internal combustion engine comprises a pre-chamber housing and a plurality of nozzles extending through a portion of the pre-chamber housing. The plurality of nozzles are directed to one location.

An ignition system for a gaseous fuel engine includes an igniter and an actuator structured to apply an actuating force to a piston within the igniter, to autoignite an ignition charge of fuel and air within the igniter. A housing of the igniter includes a gas orifice having a flow area that is increased between a combustion pre-chamber in the igniter and a main combustion chamber in the engine, to limit velocity of outgoing combustion gases to below a threshold velocity for engine mis-fire.

An engine has, for each cylinder, a combustion chamber and a combustion pre-chamber communicating with the combustion chamber. First and second spark plugs are associated with the pre-chamber and combustion chamber, respectively. Gasoline is injected by an injector device directly into the combustion chamber and/or by an injector device into a cylinder intake duct. There is no device for injecting gasoline, air or an air/gasoline mixture directly into the pre-chamber. The engine operates with an air/gasoline mixture substantially corresponding to stoichiometric, for compatibility with an exhaust system having a trivalent catalyst. The pre-chamber is not used for engine operation with poor dosing, but to increase resistance to engine detonation. The engine can thus be configured with a high compression ratio, with a significant reduction in fuel consumption at the same power level. The second spark plug is only activated at low and medium engine loads to stabilize combustion.