The invention relates to a cylinder head (10) for a combustion engine, where the cylinder head (10) comprises one or more gas channels (18a, 18b) with a gas connection (20) to receive gas and which is connected with one or more valves (14,16) for control of gas supply and gas admission, where said one or more valves (14,16) are fitted on or in the cylinder head (10). The cylinder head (10) comprises an internal gas channel (18a, 18b) that runs from the gas connection (20) and internally in the cylinder head (10) to said one or more valves (14,16). Also described is a method for supply of prechamber gas in a cylinder head (10) belonging to a combustion engine, in which gas is led through an internal boring (22) that is connected with a gas channel (18a) integrated internally in the cylinder head (10), where the internal boring (22) runs into an prechamber (26) in the cylinder head (10).

An internal combustion engine having at least one cylinder that has a main combustion chamber for burning a fuel/air mixture or a fuel/air/exhaust gas mixture and has a flushed prechamber connected to the main combustion chamber via at least one overflow duct on the fluid side. At least one exhaust gas turbocharger is provided that has a turbine for the expansion of the at exhaust gas leaving the at least one cylinder and a compressor for compressing fresh air or a fresh air/exhaust gas mixture to be supplied to the at least one cylinder as compressed charge-air. In a charge-air line downstream of the compressor, an extraction point is formed from which a flushing line branches off, via which a partial amount of charge-air of the compressed charge-air for flushing the at least one prechamber can be extracted.

An internal combustion engine having at least one cylinder that has a main combustion chamber for burning a fuel/air mixture or a fuel/air/exhaust gas mixture and has a flushed prechamber connected to the main combustion chamber via at least one overflow duct on the fluid side. At least one exhaust gas turbocharger is provided that has a turbine for the expansion of the at exhaust gas leaving the at least one cylinder and a compressor for compressing fresh air or a fresh air/exhaust gas mixture to be supplied to the at least one cylinder as compressed charge-air. In a charge-air line downstream of the compressor, an extraction point is formed from which a flushing line branches off, via which a partial amount of charge-air of the compressed charge-air for flushing the at least one prechamber can be extracted.

A gas injector has an injector lance, a drive unit, a push rod and a valve. The injector lance has a free end for injecting gas into an external unit. The drive unit generates a linear movement of the push rod, as a result of which the push rod actuates the valve and exposes a valve through-passage opening, in order for the gas to be injected. The valve through-passage opening is arranged in the region of the free end of the injector lance ). The gas injector can be designed to be relatively small and narrow. It minimizes switching delays, avoids dead spaces and prevents contamination of the valve.

A gas injector has an injector lance, a drive unit, a push rod and a valve. The injector lance has a free end for injecting gas into an external unit. The drive unit generates a linear movement of the push rod, as a result of which the push rod actuates the valve and exposes a valve through-passage opening, in order for the gas to be injected. The valve through-passage opening is arranged in the region of the free end of the injector lance ). The gas injector can be designed to be relatively small and narrow. It minimizes switching delays, avoids dead spaces and prevents contamination of the valve.

The invention relates to a cylinder head (10) for a combustion engine, where the cylinder head (10) comprises one or more gas channels (18a, 18b) with a gas connection (20) to receive gas and which is connected with one or more valves (14,16) for control of gas supply and gas admission, where said one or more valves (14,16) are fitted on or in the cylinder head (10). The cylinder head (10) comprises an internal gas channel (18a, 18b) that runs from the gas connection (20) and internally in the cylinder head (10) to said one or more valves (14,16). Also described is a method for supply of prechamber gas in a cylinder head (10) belonging to a combustion engine, in which gas is led through an internal boring (22) that is connected with a gas channel (18a) integrated internally in the cylinder head (10), where the internal boring (22) runs into an prechamber (26) in the cylinder head (10).

An efficient engine combustion system with multiple combustion modes, includes a valve actuating mechanism, a pre-combustion chamber, and a main combustion chamber. The valve actuating mechanism is a fully variable valve mechanism; an intake valve and an exhaust valve are driven by high-pressure oil; ignition is implemented by means of an ignition apparatus of the pre-combustion chamber; and a spark plug and a single-hole fuel injector are mounted in the pre-combustion chamber, a bottom end of which is provided with a flame jet hole. The continuous variable of valve timing and real-time adjustment of valve lift are realized by the control of a three-position four-way servo valve, driven by the high-pressure oil and monitored by a displacement sensor. The efficient engine combustion system with multiple combustion modes employs different combustion modes under different engine conditions, so as to ensure optimal thermal efficiency under different operating condition regions.

A precombustion chamber gas engine includes a main-chamber forming portion forming a main combustion chamber, a precombustion-chamber forming portion forming a precombustion chamber communicating with the main combustion chamber via a plurality of nozzle holes, and an ignition device disposed in the precombustion chamber and having an ignition portion spaced from a main chamber central axis of the main combustion chamber at a predetermined distance. In a plan view, the precombustion chamber has a near-ignition region including the ignition portion and a far-ignition region opposite to the near-ignition region separated by a borderline passing through a precombustion chamber central axis of the precombustion chamber and perpendicular to a straight line passing through the precombustion chamber central axis and the ignition portion. The distance between the precombustion chamber central axis and a precombustion-chamber-side opening end, connected to the precombustion chamber, of a specific far nozzle hole which is at least one nozzle hole in the far-ignition region is shorter or longer than the distance between the precombustion chamber central axis and a precombustion-chamber-side opening end of a specific near nozzle hole which is at least one nozzle hole in the near-ignition region.

In one aspect, an engine ignition apparatus for a natural gas engine may include a housing including a drive piston, a floating piston, a controllable hydraulic fluid chamber located between the drive piston and the floating piston, and an ignition chamber acted on by the floating piston, the ignition chamber having an outlet formed by a plurality of orifices, the outlet being in direct communication with a combustion chamber of the engine. In another aspect, an engine ignition apparatus for a natural gas engine may include, among other features, a controllable valve connected to a hydraulic fluid chamber, and configured to open and release a hydraulic fluid from the hydraulic fluid chamber, and to close. In still another aspect, a method for controlling an engine ignition apparatus for an engine includes, among other features, controlling a volume of a hydraulic fluid chamber of an ignition apparatus.

Operating an internal combustion engine system includes advancing a prechamber piston in a fuel delivery igniter to push a main charge of fuel from a prechamber into a cylinder, and advancing the prechamber piston to compression-ignite a pilot charge within the prechamber. Combustion gases of the pilot charge are conveyed into the cylinder to ignite the main charge. Operation of the engine system provides sparkless gaseous fuel ignition.