The invention relates to a fuel injector (1), comprising: a pre-chamber (17) within the injector, a high-pressure injector part (3) for discharging combustible gas, which high-pressure injector part has a nozzle unit (5) and a reciprocating nozzle valve element (7), a nozzle-side end section of which is accommodated in a high-pressure chamber (11) of the high-pressure injector part (3), a pre-chamber assembly (39), within the framework of which the high-pressure chamber (11) of the high-pressure injector part (3) is separated over a nozzle-side end section, the high-pressure chamber being surrounded by the pre-chamber (17).

The invention relates to a fuel injector (1), comprising: a pre-chamber (17) within the injector, a high-pressure injector part (3) for discharging combustible gas, which high-pressure injector part has a nozzle unit (5) and a reciprocating nozzle valve element (7), a nozzle-side end section of which is accommodated in a high-pressure chamber (11) of the high-pressure injector part (3), a pre-chamber assembly (39), within the framework of which the high-pressure chamber (11) of the high-pressure injector part (3) is separated over a nozzle-side end section, the high-pressure chamber being surrounded by the pre-chamber (17).

The valve ignition prechamber (1) with a reversed direction of combustion includes a lamination cavity (6) in which opens a pilot charge injector (32), and said cavity (6) being connected to a combustion chamber (5) of an internal combustion engine by a lamination duct (7), which, when opened by a lamination valve (13), forms with the latter a torch-ignition prechamber while an inverter housing (93) containing an ignition pilot charge (27) and accommodating ignition means (11) is housed in the lamination cavity (6) with which it forms a late combustion volume, said housing (93) comprising a main ejection nozzle (94) which can emit a pre-ignition torch in the direction of the lamination duct (7), the volume swept by said torch forming an early combustion volume.

The valve ignition prechamber (1) with a reversed direction of combustion includes a lamination cavity (6) in which opens a pilot charge injector (32), and said cavity (6) being connected to a combustion chamber (5) of an internal combustion engine by a lamination duct (7), which, when opened by a lamination valve (13), forms with the latter a torch-ignition prechamber while an inverter housing (93) containing an ignition pilot charge (27) and accommodating ignition means (11) is housed in the lamination cavity (6) with which it forms a late combustion volume, said housing (93) comprising a main ejection nozzle (94) which can emit a pre-ignition torch in the direction of the lamination duct (7), the volume swept by said torch forming an early combustion volume.

Methods and systems are provided for an engine having a pre-chamber ignition system. In one example, a method may include adjusting a valve coupled between a pre-chamber of an engine cylinder and a main chamber of the engine cylinder between a fully open position and a fully closed position based on whether pre-chamber ignition is desired or direct spark ignition is desired. In this way, the engine may be operated with direct spark ignition during conditions when pre-chamber combustion has reduced stability without including additional spark plugs and air injectors.

A multi-stage combustion engine includes: a pre-compression cylinder including a pre-compression piston operating therein; a combustion cylinder including a combustion piston operating therein. An operating rate of the pre-compression piston is less than an operating rate of the combustion piston.

Methods and systems are provided for reducing wall-wetting and improving mixing of air and fuel within a pre-chamber system of an engine. In one example, a method comprises supplying an air flow to the pre-chamber system via an air injector system while a piston associated with a main chamber is undergoing reciprocating motion. In this way, a rotating or swirling flow of fuel exiting a pre-chamber fuel injector of the pre-chamber system may be induced, which may reduce wall-wetting and improve air and fuel mixing, and when fuel is not being injected to the pre-chamber system the air flow may pressurize the pre-chamber system to reduce an amount of residuals from the main chamber to the pre-chamber system.

Methods and systems are provided for reducing wall-wetting and improving mixing of air and fuel within a pre-chamber system of an engine. In one example, a method comprises supplying an air flow to the pre-chamber system via an air injector system while a piston associated with a main chamber is undergoing reciprocating motion. In this way, a rotating or swirling flow of fuel exiting a pre-chamber fuel injector of the pre-chamber system may be induced, which may reduce wall-wetting and improve air and fuel mixing, and when fuel is not being injected to the pre-chamber system the air flow may pressurize the pre-chamber system to reduce an amount of residuals from the main chamber to the pre-chamber system.

The invention relates to a fuel injector (1), comprising: a pre-chamber (17) within the injector, a high-pressure injector part (3) for discharging combustible gas, which high-pressure injector part has a nozzle unit (5) and a reciprocating nozzle valve element (7), a nozzle-side end section of which is accommodated in a high-pressure chamber (11) of the high-pressure injector part (3), a pre-chamber assembly (39), within the framework of which the high-pressure chamber (11) of the high-pressure injector part (3) is separated over a nozzle-side end section, the high-pressure chamber being surrounded by the pre-chamber (17).

The invention relates to a fuel injector (1), comprising: a pre-chamber (17) within the injector, a high-pressure injector part (3) for discharging combustible gas, which high-pressure injector part has a nozzle unit (5) and a reciprocating nozzle valve element (7), a nozzle-side end section of which is accommodated in a high-pressure chamber (11) of the high-pressure injector part (3), a pre-chamber assembly (39), within the framework of which the high-pressure chamber (11) of the high-pressure injector part (3) is separated over a nozzle-side end section, the high-pressure chamber being surrounded by the pre-chamber (17).