Abstract: A fuel injection control device according to an embodiment is a device for controlling fuel injection performed by a fuel injection device disposed in a cylinder of a two-stroke engine, comprising: a scavenging and exhaust gas state quantity acquisition part configured to acquire a parameter related to a state quantity of scavenging and exhaust gas in the cylinder; a swirl momentum calculation part configured to calculate a momentum of swirl generated in the cylinder on the basis of the parameter; and a fuel injection pressure calculation part configured to calculate an injection pressure of fuel from the fuel injection device corresponding to the momentum of swirl calculated by the swirl momentum calculation part.

Abstract: An opposed-piston engine includes: a cylinder; a one-side piston disposed inside the cylinder on one side in an axial direction; and an other-side piston disposed inside the cylinder on another side in the axial direction. Atop surface of the one-side piston has a one-side cavity recessed in a central portion. A top surface of the other-side piston has an other-side cavity recessed in a central portion. An outer peripheral edge of the one-side cavity is at least 0.1D1 away from an outer peripheral edge of the top surface of the one-side piston over the entire circumference, where D1 is a diameter of the top surface of the one-side piston. An outer peripheral edge of the other-side cavity is at least 0.1D2 away from an outer peripheral edge of the top surface of the other-side piston over the entire circumference, where D2 is a diameter of the top surface of the other-side piston.

Abstract: A fuel injection control device according to an embodiment is a device for controlling fuel injection performed by a fuel injection device disposed in a cylinder of a two-stroke engine, comprising: a scavenging and exhaust gas state quantity acquisition part configured to acquire a parameter related to a state quantity of scavenging and exhaust gas in the cylinder; a swirl momentum calculation part configured to calculate a momentum of swirl generated in the cylinder on the basis of the parameter; and a fuel injection pressure calculation part configured to calculate an injection pressure of fuel from the fuel injection device corresponding to the momentum of swirl calculated by the swirl momentum calculation part.

Abstract: An engine according to an embodiment includes at least one cylinder, at least one piston disposed in the at least one cylinder, a plurality of fuel injection valves disposed on the at least one cylinder, the plurality of fuel injection valves including a first fuel injection valve having a predetermined total hole area and a second fuel injection valve having a total hole area smaller than the total hole area of the first fuel injection valve, and a control device for controlling the first fuel injection valve and the second fuel injection valve according to a load of the engine.

Abstract: 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 therma

Abstract: There is provided an internal combustion engine in which respective combustion states of cylinders can be uniformized with a simple configuration. A central axis (CL1) of a connecting part (7) of one of air supply ports (5) inclines with a predetermined inclination angle in a direction away from an air supply inlet (3) with respect to a y direction orthogonal to an x direction in which an air supply manifold 1 extends, and an inclination angle of the connecting part (7) of the one of the air supply ports (5) is larger than an inclination angle of the connecting part (7) of other air supply ports (5) located on a side closer to the air supply inlet (3) than the one of the air supply ports (5).

Abstract: A heat exchanger includes: the pair of the oil holes being positioned on an outer edge of one of the core plates, being positioned at symmetrical positions with respect to the center of the one of the core plates to sandwich the center of the one of the core plates, and being positioned to sandwich one of the fin plates along the first reference line, and the pair of the coolant holes being positioned on the outer edge of the one of the core plates, being positioned at symmetrical positions with respect to the center of the one of the core plates to sandwich the center of the one of the core plates, and being positioned to sandwich the one of the fin plates along the first reference line.

Abstract: A heat exchanger includes: each of the fin plates having a V shaped or trapezoid corrugated shape, and including top walls positioned at top portions of the corrugated shape, bottom walls positioned at bottom portions of the corrugated shape, and foot portions each connecting one of the top walls and one of the bottom walls, each of the foot portions having a rectangular corrugated shape along one of the top walls and one of the bottom walls, and including stepped walls formed at a predetermined interval along the one of the top walls and the one of the bottom walls, and opening portions each formed in one of the stepped walls, and being an elongated through holes having a width equal to or smaller than a thickness of one of the fin plates.

Abstract: 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 therma

Abstract: A heat exchanger includes: each of the fin plates having a V shaped or trapezoid corrugated shape, and including top walls positioned at top portions of the corrugated shape, bottom walls positioned at bottom portions of the corrugated shape, and foot portions each connecting one of the top walls and one of the bottom walls, each of the foot portions having a rectangular corrugated shape along one of the top walls and one of the bottom walls, and including stepped walls formed at a predetermined interval along the one of the top walls and the one of the bottom walls, and opening portions each formed in one of the stepped walls, and being an elongated through holes having a width equal to or smaller than a thickness of one of the fin plates.

Abstract: A heat exchanger includes: the pair of the oil holes being positioned on an outer edge of one of the core plates, being positioned at symmetrical positions with respect to the center of the one of the core plates to sandwich the center of the one of the core plates, and being positioned to sandwich one of the fin plates along the first reference line, and the pair of the coolant holes being positioned on the outer edge of the one of the core plates, being positioned at symmetrical positions with respect to the center of the one of the core plates to sandwich the center of the one of the core plates, and being positioned to sandwich the one of the fin plates along the first reference line.

Abstract: There is provided an internal combustion engine in which respective combustion states of cylinders can be uniformized with a simple configuration. A central axis (CL1) of a connecting part (7) of one of air supply ports (5) inclines with a predetermined inclination angle in a direction away from an air supply inlet (3) with respect to a y direction orthogonal to an x direction in which an air supply manifold 1 extends, and an inclination angle of the connecting part (7) of the one of the air supply ports (5) is larger than an inclination angle of the connecting part (7) of other air supply ports (5) located on a side closer to the air supply inlet (3) than the one of the air supply ports (5).