A system for controlling enriched prechamber stoichiometry includes a prechamber ignition device, and an ignition control system that includes a sensor structured to measure an amount of at least one of CO2 or O2 in a prechamber, an engine timing sensor, a fuel quality sensor, and an electronic control unit. The electronic control unit is structured to receive signals from each of the sensors and determine an air-fuel ratio of the prechamber for comparison with a target air-fuel ratio, and produce a fuel delivery signal based on the comparison.

A method and a unit for operating or for the operation of a fuel metering system of an internal combustion engine, in particular in a motor vehicle, and it being provided, in particular, that at least one operating variable of the internal combustion engine is detected, a dynamic operating state of the internal combustion engine is detected based on the at least one detected operating variable, and a dynamic correction to the fuel metering system of the internal combustion engine is carried out for a detected dynamic operating state of the internal combustion engine, taking into account the efficiency of an NOx exhaust gas aftertreatment system.

A method for operating an internal combustion engine system using gaseous fuel is disclosed. The method includes injecting, by activating a fuel injector to generate a first injection in association with a compression stroke, a first amount of gaseous fuel into a pre-combustion chamber, wherein the first injection and the first amount of gaseous fuel are adapted so that an ignitable fuel-air mix is formed in the pre-combustion chamber but not in a main combustion chamber; igniting, by activating an igniter, the ignitable fuel-air mix in the pre-combustion chamber formed by the first injection; and injecting, by activating the fuel injector to generate a second injection after ignition of the first amount of fuel, a second amount of gaseous fuel into the pre-combustion chamber, wherein the second injection and the second amount of gaseous fuel are adapted so that fuel is forced through the orifices into the main combustion chamber.

An object is to provide a precombustion-chamber fuel supply device for a precombustion-chamber gas engine having high reliability and low operation cost by reducing outflow of fuel gas to the precombustion chamber in the exhaust stroke and dispersion of the amount of fuel gas supplied to the cylinders, which makes it possible to cut fuel consumption and to achieve stable combustion. A gas internal combustion engine of a Miller-cycle type includes: a main chamber 60 defined between a piston and a cylinder head 1; a precombustion chamber 4 which communicates with the main chamber 60 via a nozzle 3 and in which fuel gas is combusted by a spark plug 10; a gas supply channel to precombustion chamber 14 for supplying the fuel gas to the precombustion chamber 4; and a check valve 6 disposed in the gas supply channel to precombustion chamber 14 and configured to open due to a pressure decrease in the precombustion chamber 4 at a BDC of an intake stroke of a Miller cycle in which the piston closes an intake valve before the BDC of the intake stroke so as to allow supply of the fuel gas to the precombustion chamber 4.

A method for controlling an internal combustion engine whereby, in a piston-cylinder unit provided with a prechamber, the quantity of propellant gas supplied to the prechamber is adjusted to regulate the operating characteristics of an inlet and/or outlet valve of the piston-cylinder unit.

A method for operating a spark ignited gaseous fuel internal combustion engine is disclosed. The engine may have at least one main combustion chamber and at least one ignition device configured to initiate an ignition event within an ignition region. The method may include supplying pressurized fuel to the ignition region at times between about 30 to about 0 crank angle before the ignition event is initiated by the ignition device for enriching the ignition region with fuel. The method may also include initiating an ignition event in the ignition region for combusting an enriched air/fuel mixture within the ignition region.

An engine controller, for an internal combustion engine, is configured to: control at least one actuator to provide an air-fuel mixture with a lambda value higher than 3 to a main combustion chamber via at least one intake valve, wherein the at least one actuator is arranged upstream of at least one intake port or which is arranged in the intake port; control at least one fuel supply system to provide fuel directly to the main combustion chamber and/or a pre-combustion chamber of a piston-cylinder unit such that at the time of ignition of the air-fuel mixture the lambda value of that air-fuel mixture in the main combustion chamber is lower than the lambda value of the air-fuel mixture provided to the main combustion chamber via the at least one intake valve.

A prechamber is provided for attachment to an inlet of a combustion chamber of an internal combustion engine. The prechamber decreases the compression ratio of the combustion chamber. Some examples of the prechamber include a means of adding a spark plug to an engine that was originally designed to ignite fuel/air through compression of the fuel/air. Other examples of the prechamber include internal structures to introduce swirl in fuel/air as it is injected. Still other examples of the prechamber include a plurality of fuel injectors, with each fuel injector being structured to introduce a different type of fuel into the prechamber. A means of selecting a specific type of fuel based on engine operating conditions is also provided.

An internal combustion engine including at least one combustion chamber having a main chamber and a prechamber, wherein the prechamber is in fluid connection with the main chamber via at least one bore. The at least one combustion chamber is connected to a charging path for the supply of a combustion air-fuel mixture into the combustion chamber via the charging path. A fuel intermixing region is arranged in a section of the charging path separately assigned to the combustion chamber, which fuel intermixing region is in fluid connection with the charging path on one side and with a fuel line on the other side for the supply of fuel into the fuel intermixing region via a controllable fuel valve. The internal combustion engine wherein the prechamber and the fuel intermixing region are in fluid connection with one another via a check valve.

A system for controlling a flow of a gas stream into a plurality of combustion chambers of an engine is provided. The system comprises a fuel reformer module configured to provide the flow of the gas stream containing hydrogen gas and carbon monoxide gas, a cooler module positioned downstream of the fuel reformer module with respect to the flow of the gas stream. The cooler module is configured to control a temperature of the gas stream. A flow control assembly is positioned downstream of the cooler module and upstream of the plurality of combustion chambers with respect to the flow of the gas stream. The flow control assembly is configured to supply a first effluent stream to a pre-chamber of the plurality of combustion chambers. The flow control assembly also supplies a second effluent stream to a main chamber of the plurality of combustion chambers.