An engine assembly includes: a two-stroke internal combustion engine; a turbocharger operatively connected to the engine, the turbocharger having a compressor and an exhaust turbine; an intake pipe fluidly connected to the engine and to the compressor of the turbocharger; an exhaust tuned pipe fluidly connected to the engine and to the exhaust turbine of the turbocharger; a temperature sensor configured to generate a signal representative of a temperature of exhaust gas flowing within the exhaust tuned pipe; and a controller. The controller is configured to: determine a boost target pressure of the turbocharger based in part on the signal generated by the temperature sensor; and control the turbocharger to provide the boost target pressure to the engine. Methods for controlling an engine are also provided.

An engine arrangement includes an engine (23), an exhaust line (25) connected downstream of the engine, exhaust after treatment equipment (27) in the exhaust line, a temperature sensor (29a-29e) for sensing a temperature of the exhaust after treatment equipment, and a turbo compound arrangement (37) including a turbo compound turbine (39) in the exhaust line. Exhaust flow through the turbo compound arrangement and the exhaust line is modified in response to one or more temperature sensor signals to increase heating of the exhaust after treatment equipment.

A configuration for a uniflow-scavenged, opposed-piston engine reduces exhaust cross-talk caused by mass flow between cylinders resulting from one cylinder having an open exhaust port during scavenging and/or charging while an adjacent cylinder is undergoing blowdown. Some configurations include a wall or other barrier feature between cylinders that are adjacent to each other and fire one after the other. Additionally, or alternatively, some engine configurations include cylinders with intake and exhaust ports sized so that there is an overlap in crank angle of two or more cylinders having open exhaust ports of about 65 crank angle degrees or less.

A configuration for a uniflow-scavenged, opposed-piston engine reduces exhaust cross-talk caused by mass flow between cylinders resulting from one cylinder having an open exhaust port during scavenging and/or charging while an adjacent cylinder is undergoing blowdown. Some configurations include a wall or other barrier feature between cylinders that are adjacent to each other and fire one after the other. Additionally, or alternatively, some engine configurations include cylinders with intake and exhaust ports sized so that there is an overlap in crank angle of two or more cylinders having open exhaust ports of about 65 crank angle degrees or less.

An improved engine exhaust extractor improves internal combustion engine performance and efficiency. The exhaust extractor includes coaxial inner and outer tubes separating a flow into an inner flow inside the inner tube and an outer flow between the tubes and merging near the exhaust extractor outlet. Helically oriented vanes extend radially from an outer face of the inner tube and reliefs are cut into the inner tube to allow gasses to flow to the outer flow. The inner tube is held in place by end pieces connecting the inner tube to the outer tube. The end pieces include fan blades with wing shaped cross-sections to increase the velocity of exhaust gasses flowing through the exhaust extractor. The fan-like supports and helically oriented vanes cause the outer flow to rotate about a central axis. The exhaust extractor is constructed from only six parts requiring only two welds.

An improved engine exhaust extractor improves internal combustion engine performance and efficiency. The exhaust extractor includes coaxial inner and outer tubes separating a flow into an inner flow inside the inner tube and an outer flow between the tubes and merging near the exhaust extractor outlet. Helically oriented vanes extend radially from an outer face of the inner tube and reliefs are cut into the inner tube to allow gasses to flow to the outer flow. The inner tube is held in place by end pieces connecting the inner tube to the outer tube. The end pieces include fan blades with wing shaped cross-sections to increase the velocity of exhaust gasses flowing through the exhaust extractor. The fan-like supports and helically oriented vanes cause the outer flow to rotate about a central axis. The exhaust extractor is constructed from only six parts requiring only two welds.

A two cycle engine having a block defining an exhaust port and a cylinder, a head, and a piston defining a combustion chamber is disclosed. The exhaust port has a resonant frequency that causes a portion of the combusted and uncombusted exhaust gasses to flow from the exhaust system and back into the combustion chamber. At a speed above the predetermined speed, a majority of the portion of the combusted and uncombusted exhaust gasses flows from the exhaust system and back into the combustion chamber without engaging the skirt of the piston.

Disclosed is an efficient thermal energy power apparatus. A nozzle is arranged on a cylinder head of an internal combustion engine. The nozzle is connected to a pressure pump through a pipe. The pressure pump is connected to a liquid storage tank through a pipe. The liquid storage tank is connected to a cooler through a pipe, and the cooler is connected to an exhaust passage through a pipe. The advantages of the present invention are: a working stroke enables the temperature of a cylinder block to be lowered, and the compression ratio is high; due to being filtered by the cooler and the liquid storage tank, discharged exhaust gas is more environmentally friendly than that of existing engines.

A four stroke internal combustion engine is disclosed comprising at least one cylinder arrangement, an exhaust conduit, and at least one turbine. The cylinder arrangement comprises an exhaust port arrangement configured to open and close an exhaust flow area, A.sub.CYL. The cylinder arrangement has a maximum volume, V.sub.MAX. The exhaust conduit extends between the exhaust flow area, A.sub.CYL, and a turbine wheel inlet area, A.sub.TIN, of the turbine and has an exhaust conduit volume, V.sub.EXH that is 0.5 times the maximum volume, V.sub.MAX. The exhaust port arrangement is configured to expose the exhaust flow area, A.sub.CYL, at a size of at least 0.22 times the maximum volume, V.sub.MAX, when a piston of the cylinder arrangement is at the bottom dead centre, BDC.

A four stroke internal combustion engine is disclosed comprising at least one cylinder arrangement, an exhaust conduit, and at least one turbine. The cylinder arrangement comprises an exhaust port arrangement configured to open and close an exhaust flow area, A.sub.CYL. The cylinder arrangement has a maximum volume, V.sub.MAX. The exhaust conduit extends between the exhaust flow area, A.sub.CYL, and a turbine wheel inlet area, A.sub.TIN, of the turbine and has an exhaust conduit volume, V.sub.EXH that is 0.5 times the maximum volume, V.sub.MAX. The exhaust port arrangement is configured to expose the exhaust flow area, A.sub.CYL, at a size of at least 0.22 times the maximum volume, V.sub.MAX, when a piston of the cylinder arrangement is at the bottom dead centre, BDC.