Methods and systems are provided for diagnosing an active exhaust valve in an exhaust system based on thermal data. In one example, a method may include indicating degradation of a first active exhaust valve positioned in a first exhaust pipe of a first engine bank based on a difference between a first temperature of exhaust downstream of the first active exhaust valve and a second temperature of exhaust downstream of a second active exhaust valve positioned in a second exhaust pipe of a second engine bank. Degradation of the valve may be confirmed based on thermal image data acquired at outlets of the first and second exhaust pipes.

An exhaust pipe structure includes a front bank exhaust pipe connected to an exhaust manifold on a front bank of the V engine; an intermediate exhaust pipe connected to a downstream side of the front bank exhaust pipe; and a rear exhaust pipe connected to a downstream side of the intermediate exhaust pipe, wherein the front bank exhaust pipe and the intermediate exhaust pipe are connected with each other via a ball joint, the intermediate exhaust pipe and the rear exhaust pipe are connected with each other via a ball joint, and a flexible pipe is attached to the front bank exhaust pipe.

An exhaust pipe structure includes a front bank exhaust pipe connected to an exhaust manifold on a front bank of the V engine; an intermediate exhaust pipe connected to a downstream side of the front bank exhaust pipe; and a rear exhaust pipe connected to a downstream side of the intermediate exhaust pipe, wherein the front bank exhaust pipe and the intermediate exhaust pipe are connected with each other via a ball joint, the intermediate exhaust pipe and the rear exhaust pipe are connected with each other via a ball joint, and a flexible pipe is attached to the front bank exhaust pipe.

An internal combustion engine system includes at least one combustor, and a first expander arranged to receive exhaust gases from at least one of the at least one combustor, and to expand and extract energy from the exhaust gases, wherein the system includes a second expander arranged to receive exhaust gases from the first expander, and to expand and extract energy from the exhaust gases.

The present invention comprises a V-type 4-stroke internal combustion engine with 16 cylinders, having a counter-clockwise direction of rotation, comprising a firing sequence controller that fires the cylinders A1 to A8 and B1 to B8 in at least one of the following firing sequences, wherein the direction of rotation and the cylinder numbering is defined in accordance with DIN ISO 1204: a) A1-B7-A2-B6-A3-B5-A5-B1-A8-B2-A7-B3-A6-B4-A4-B8 b) A1-B7-A2-B6-A6-B4-A5-B1-A8-B2-A7-B3-A3-B5-A4-B8 c) A1-B7-A2-B5-A4-B3-A6-B1-A8-B2-A7-B4-A5-B6-A3-B8 d) A1-B4-A4-B6-A3-B7-A2-B8-A8-B5-A5-B3-A6-B2-A7-B1 e) A1-B5-A5-B3-A6-B2-A7-B1-A8-B4-A4-B6-A3-B7-A2-B8.
and further shows a corresponding engine having a clockwise direction of rotation, comprising a firing sequence controller that fires the cylinders A1 to A8 and B1 to B8 in at least one of the following firing sequences: a) B1-A7-B2-A6-B3-A5-B5-A1-B8-A2-B7-A3-B6-A4-B4-A8 b) B1-A7-B2-A6-B6-A4-B5-A1-B8-A2-B7-A3-B3-A5-B4-A8 c) B1-A7-B2-A5-B4-A3-B6-A1-B8-A2-B7-A4-B5-A6-B3-A8 d) B1-A4-B4-A6-B3-A7-B2-A8-B8-A5-B5-A3-B6-A2-B7-A1 e) B1-A5-B5-A3-B6-A2-B7-A1-B8-A4-B4-A6-B3-A7-B2-A8.

The present invention comprises a V-type 4-stroke internal combustion engine with 16 cylinders, having a counter-clockwise direction of rotation, comprising a firing sequence controller that fires the cylinders A1 to A8 and B1 to B8 in at least one of the following firing sequences, wherein the direction of rotation and the cylinder numbering is defined in accordance with DIN ISO 1204: a) A1-B7-A2-B6-A3-B5-A5-B1-A8-B2-A7-B3-A6-B4-A4-B8 b) A1-B7-A2-B6-A6-B4-A5-B1-A8-B2-A7-B3-A3-B5-A4-B8 c) A1-B7-A2-B5-A4-B3-A6-B1-A8-B2-A7-B4-A5-B6-A3-B8 d) A1-B4-A4-B6-A3-B7-A2-B8-A8-B5-A5-B3-A6-B2-A7-B1 e) A1-B5-A5-B3-A6-B2-A7-B1-A8-B4-A4-B6-A3-B7-A2-B8.
and further shows a corresponding engine having a clockwise direction of rotation, comprising a firing sequence controller that fires the cylinders A1 to A8 and B1 to B8 in at least one of the following firing sequences: a) B1-A7-B2-A6-B3-A5-B5-A1-B8-A2-B7-A3-B6-A4-B4-A8 b) B1-A7-B2-A6-B6-A4-B5-A1-B8-A2-B7-A3-B3-A5-B4-A8 c) B1-A7-B2-A5-B4-A3-B6-A1-B8-A2-B7-A4-B5-A6-B3-A8 d) B1-A4-B4-A6-B3-A7-B2-A8-B8-A5-B5-A3-B6-A2-B7-A1 e) B1-A5-B5-A3-B6-A2-B7-A1-B8-A4-B4-A6-B3-A7-B2-A8.

A marine motor having an internal combustion engine having an engine block with at least one cylinder, an air intake, an exhaust conduit configured to direct a flow of exhaust gas from the at least one cylinder, and an exhaust gas recirculation system configured to recirculate a portion of the flow of exhaust gas from the exhaust conduit to the air intake. The exhaust gas recirculation system includes a first exhaust gas recirculation circuit with at least one first EGR cooler having a first overall conductance, and includes a second exhaust gas recirculation circuit with at least one second EGR cooler having a second overall conductance which is greater than the first overall conductance. The exhaust gas recirculation system also includes flow control means configured to selectively vary the relative proportions of first and second flows of recirculated exhaust gas through the first and second exhaust gas recirculation circuits to allow the amount of exhaust gas cooling to be varied.

Internal combustion engines that operate in an inverted orientation in which the piston is closer to the local gravitationally dominant terrestrial body's center of gravity at top dead center position than at bottom dead center position are disclosed. The engines may have non-circular, preferably rectangular, cross-section pistons and cylinders, and the pistons may include a skirt with a field of pockets that provide a ringless, non-lubricated, seal equivalent. The pistons also may have a domed piston head with depressions thereon to facilitate the movement of air/charge in the cylinder. The engines also may use multi-stage poppet valves in lieu of conventional poppet valves, and a split crankshaft. The engines may use the pumping motion of the engine piston to supercharge the cylinder with air/charge.

Internal combustion engines that operate in an inverted orientation in which the piston is closer to the local gravitationally dominant terrestrial body's center of gravity at top dead center position than at bottom dead center position are disclosed. The engines may have non-circular, preferably rectangular, cross-section pistons and cylinders, and the pistons may include a skirt with a field of pockets that provide a ringless, non-lubricated, seal equivalent. The pistons also may have a domed piston head with depressions thereon to facilitate the movement of air/charge in the cylinder. The engines also may use multi-stage poppet valves in lieu of conventional poppet valves, and a split crankshaft. The engines may use the pumping motion of the engine piston to supercharge the cylinder with air/charge.

A V-type 4-stroke internal combustion engine having 20 cylinders, having a counterclockwise or clockwise direction of rotation, comprising a crankshaft with a torsional vibration damper and a flywheel arranged on the crankshaft, wherein the crankshaft has crank throws forming a crank star, wherein in each case the piston rods of the two cylinders of a V-segment are connected to the same crank throw, wherein the crank throws C1 to C10 have one of the following angular sequences in the direction of rotation of the engine when seen from the side of the flywheel, with the crank throws numbered as C1 to C10 when starting from the side of the flywheel: (i) C1-C9-C4-C6-C3-C10-C2-C7-C5-C8, (ii) C1-C8-C5-C7-C2-C10-C3-C6-C4-C9, (iii) C1-C9-C5-C7-C3-C10-C2-C6-C4-C8, (iv) C1-C9-C7-C3-C6-C10-C2-C4-C8-C5, (v) C1-C7-C5-C8-C2-C10-C4-C6-C3-C9, (vi) C1-C9-C7-C3-C5-C10-C2-C4-C8-C6, (vii) C1-C6-C8-C4-C2-C10-C5-C3-C7-C9, (viii) C1-C5-C8-C4-C2-C10-C6-C3-C7-C9, (ix) C1-C8-C4-C6-C2-C10-C3-C7-C5-C9.