An engine is equipped with a gas feeding system, including main gas injectors each associated with an intake duct of a respective engine cylinder, a gas distribution manifold communicating with said main injectors, a gas tank, connected to the manifold, where pressurized gas is accumulated, a controlled pressure valve interposed between the tank and manifold, and a control unit for controlling the pressure valve to establish a gas pressure in the manifold. A spark plug of each cylinder is mounted within a support body that defines a combustion pre-chamber and a channel for auxiliary gas injection within the pre-chamber, communicating with a respective auxiliary gas injector. The auxiliary gas injectors are in communication with the manifold, downstream of the pressure valve. In the channel, a non-return valve and a restricted passage are provided in series, providing for passage of gas flow proportional to a volume of the pre-chamber.

A Venturi-based purge vapor supply system for a turbulent jet ignition (TJI) engine and its method of operation utilize an air compressor configured to output pressurized air, a vapor canister configured to store purge vapor evaporated from liquid fuel housed in a fuel tank, a purge vapor injector configured to inject a mixture of air and purge vapor into a pre-chamber of the TJI engine and an ejector tee connected between the air compressor, the vapor canister, and the purge vapor injector, the ejector tee having a Venturi-based design such that the pressurized air from the air compressor draws the purge vapor into the ejector tee and combines the air and the purge vapor to form and output the mixture of air and purge vapor to the purge vapor injector.

A control system for a compression ignition engine configured to start compression ignition combustion by igniting mixture gas formed by injecting fuel into combustion chambers is provided, which includes combustion chambers each defined in respective cylinders so that displacements of the combustion chambers change by respective pistons reciprocating, a throttle valve, ignition plugs, injectors, a sensor having measuring parts including an atmospheric-pressure detector configured to detect an atmospheric pressure, and configured to measure parameters related to operation of the engine, and a controller. The controller executes a lean compression ignition combustion control in which compression ignition combustion is performed at a given lean air-fuel ratio higher than a stoichiometric air-fuel ratio. The controller restricts the execution of the lean compression ignition combustion control when the controller determines that the atmospheric pressure is lower than a given threshold based on a signal outputted from the atmospheric-pressure detector.

A precombustion-chamber type gas engine, comprising includes: a check valve disposed in the precombustion-chamber gas supply passage and configured to block a backflow of fuel gas from a precombustion chamber; a supply pressure control valve which is disposed on an upstream side of the check valve in the precombustion-chamber gas supply passage and which is capable of adjusting a pressure of the fuel gas to be supplied to the precombustion chamber; a torch strength information acquisition device configured to obtain torch strength information correlated to strength of a torch from the injection nozzle, on the basis of a pressure in the main chamber and a pressure in the precombustion chamber; a precombustion-chamber gas supply amount calculation device configured to calculate an amount of the fuel gas to be supplied to a precombustion-chamber gas supply amount, on the basis of the torch strength information and correlation information representing a correlation between the torch strength information, a thermal efficiency, and the precombustion-chamber gas supply amount; and a precombustion-chamber gas supply pressure control device configured to control the supply pressure control valve on the basis of the precombustion-chamber gas supply amount calculated by the precombustion-chamber gas supply amount calculation device.

Disclosed is an ammonia-hydrogen blended fuel control system based on reactivity regulation. The control system comprises a vehicle-mounted ammonia-hydrogen fuel supply system, an ammonia-hydrogen blended fuel premixed combustion engine and an ECU (Electronic Control Unit). The ECU is used for regulating the air injection amount and pressure value of ammonia fuel and hydrogen waiting to enter the ammonia-hydrogen blended fuel premixed combustion engine. The vehicle-mounted ammonia-hydrogen fuel supply system comprises a low-pressure liquid ammonia supply unit and a vehicle-mounted hydrogen production unit, and is used for providing the prepared low-pressure ammonia fuel and hydrogen for the ammonia-hydrogen blended fuel premixed combustion engine. The ammonia-hydrogen blended fuel premixed combustion engine comprises a turbulent jet ignition device provided with a pre-chamber. An ammonia injector and a first hydrogen injector which face the cylinder head are respectively arranged on the air inlet pipe.

A method of operating the stratified charge Merritt Engine described in WO2005/052335 and WO2007/0830366 enabling new benefits such as full compliance with NOx emission regulations, control over peak pressures, increased power density, and high fuel economy all enabled by preprogramming the timing of the gasoline direct fuel injection process.

Internal combustion engine comprising at least one cylinder and a piston supported for repeated reciprocal movement in the cylinder so as to define a combustion chamber of an engine bore diameter A-A, the internal combustion engine further comprising an ignition device arranged in said cylinder having an igniter portion and an fuel injector which are both arranged in a pre-chamber, wherein the pre-chamber comprises a plurality of orifices for providing fluid communication between said pre-chamber and the combustion chamber, and wherein the plurality of orifices are of an overall orifice area so that the ratio between the overall orifice area and the engine bore diameter A-A ranges from 0.01 mm to 0.2 mm.

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.

An auxiliary chamber having an auxiliary fuel injector is formed on the top surface of a main combustion chamber. When making the air-fuel mixture inside the auxiliary chamber burn, the air-fuel mixture inside the main combustion chamber is burned by jet flames ejected from a communicating hole. After engine startup and until the elapse of a wall surface lower temperature period where the wall surface temperature of the auxiliary chamber becomes a lower temperature than the wall surface temperature of the auxiliary chamber at the time of completion of warmup, an injection ratio of an injection amount of liquid fuel from the auxiliary fuel injector to a fuel injection amount from a main fuel injector is made to decrease compared with after completion of warmup.

A method for starting an internal combustion engine comprises the steps of: providing an internal combustion engine having at least one cylinder and a piston supported at a crankshaft for repeated reciprocal movement in the cylinder so as to define a main combustion chamber, the internal combustion engine further having an ignition device arranged in said cylinder with an igniter portion and a fuel injector which are both arranged at a pre-chamber, wherein the pre-chamber has a plurality of orifices for providing fluid communication between said pre-chamber and the main combustion chamber, injecting fuel in the pre-chamber, and igniting the injected fuel in the pre-chamber for pre-heating of the pre-chamber prior to injecting fuel in the main combustion chamber for combusting the injected fuel in the main combustion chamber.