Disclosed is a BOG reliquefaction system. The BOG reliquefaction system includes: a compressor compressing BOG; a heat exchanger cooling the BOG compressed by the compressor through heat exchange using BOG not compressed by the compressor as a refrigerant; a pressure reducer disposed downstream of the heat exchanger and reducing a pressure of fluid cooled by the heat exchanger; and a second oil filter disposed downstream of the pressure reducer, wherein the compressor includes at least one oil-lubrication type cylinder and the second oil filter is a cryogenic oil filter.

The present invention relates to a method for operating an internal combustion engine provided as a medium-speed gas engine or dual fuel engine in a gas fuel mode. The method comprises the step of directly injecting a gas fuel into a combustion chamber of the engine at a maximum injection pressure that is lower than a compression-end pressure of the engine.

A gas injector for injecting a gaseous fuel. The gas injector includes a solenoid actuator having an armature, an internal pole and a coil; a closing element, which unblocks and seals a gas path at a valve seat, the armature being connected to the closing element; a sealed lubricant chamber, which is filled with a lubricant, and in which the armature is situated, the lubricant ensuring lubrication of the armature; and a flexible sealing element, which seals the lubricant chamber with respect to the gas path, a damping device being situated in the lubricant chamber.

The invention relates to a fuel injection device for an internal combustion engine comprising at least one central rail which is in fluid communication with at least one primary fuel tank, characterized in that at least one auxiliary fuel pressure accumulator is provided, the internal volume of which is in communication with the central rail via at least one control valve in order to temporarily provide a simultaneous fuel supply to the central rail from the auxiliary fuel pressure accumulator and the primary fuel tank.

Methods and systems for operating an engine coupled to a fuel system having at least one fuel manifold configured to supply fuel to a combustor of the engine are described. The method comprises, when the engine is active, supplying fuel to the combustor by supplying gaseous fuel from a gaseous fuel supply to the at least one fuel manifold, and when the engine is inactive, purging the at least one fuel manifold by supplying inert gas from an inert gas supply to the at least one fuel manifold.

An assembly is provided for an engine. This engine assembly includes a fuel system, a sensor and a processing system. The fuel system includes a fuel source, an engine component and a fuel circuit configured to direct fuel from the fuel source to the engine component. The sensor is configured to provide sensor data indicative of a measured parameter of the fuel directed through the fuel circuit from the fuel source to the engine component. The processing system is configured to identify a fuel leak in the fuel system based on the sensor data. The fuel leak is identified when a measured value corresponding to the measured parameter of the fuel is less than an expected value corresponding to an expected parameter for the fuel directed through the fuel circuit from the fuel source to the engine component.

A multi-fuel switching device, including a gas part, is provided. The gas part includes a switching valve. The switching valve includes a housing having an air inlet and an air outlet. An internal rotation of the housing is provided with a valve core located between the air inlet and the air outlet. The valve core is provided with a first airway and a second airway. Cross-sectional sizes of the first airway and the second airway are different. The first airway or the second airway is selected through rotating the valve core to connect the air inlet and the air outlet. The solution solves the issue that a fuel switching device in the prior art cannot adapt to three or more fuels, which causes an internal combustion engine to be unable to maintain the optimal working state.

A system may include a first methanol tank and a second methanol tank connected to the first tank. The system may include a first valve fluidly connected to the first methanol tank and the second methanol tank. The system may include a heat exchanger connected to the second methanol tank and a turbine of a turbocharger. The system may include a second valve fluidly connected to an intake system of an engine.

The present invention relates to a gas supply pump comprising: a camshaft which can be rotated; a plurality of cam noses provided at regular intervals in a lengthwise direction of the camshaft and having an eccentric shape from the center of the camshaft; a cam roller provided to be in close contact with each cam nose; and a drive shaft and a piston provided to neighbor with one side of the cam roller; and a liquefied gas compression device which pressurizes and exhausts a liquefied gas according to a straight reciprocation of the piston.

Disclosed is a multiple combustion mode engine with ammonia fuel including an cylinder head, a cylinder sleeve, a piston, a main combustion chamber, an inlet valve and an exhaust valve, and further including a jet ignition device arranged on the cylinder head and used for providing an ignition source for the main combustion chamber, and an ammonia injector used for providing ammonia/air mixture gas for the main combustion chamber. Also disclosed is a control method of the multiple combustion mode engine with ammonia fuel. The time sequence of ammonia injection of the main combustion chamber and jet flame generation of the pre-chamber is controlled, the mixed state of the fuel/air in the main combustion chamber before ignition can be controlled, and finally different combustion modes, i.e. a premixed combustion mode and a diffusion combustion mode, are formed in the main combustion chamber.