An internal combustion (IC) power plant includes an IC engine and an exhaust system carrying exhaust gasses from the IC engine to an outlet communicating to the atmosphere.

An exhaust gas/reactant mixing assembly for an exhaust gas system of an internal combustion engine includes a mixing channel defining a longitudinal axis and extending in the direction thereof. A reactant delivery unit delivers reactant (R) into the mixing channel and an exhaust gas supply channel is arranged upstream of the mixing channel. The exhaust gas supply channel opens into the mixing channel at an opening channel region, wherein the opening channel region has at least two opening channel portions opening into the mixing channel.

The present invention relates to a manifold for receiving exhausts from a multi-cylindrical internal combustion engine. The internal combustion engine has such a firing order that the riser in the manifold receives exhausts from two cylinders during an overlapping stage, simultaneously via an inlet opening arranged upstream and from an inlet opening arranged downstream in the riser. The riser comprises a substantially constant cross sectional area, except in one area, which is located in a position in connection with the inlet opening arranged downstream of the two inlet openings, receiving exhausts simultaneously. Said area has a geometry facilitating receipt and flow of exhausts in the predetermined direction in the riser, on occasions when the two inlet openings receive exhausts simultaneously.

An outlet manifold is provided and includes an outlet portion having first and second sides and an inlet portion to which the outlet portion is fluidly coupled. The inlet portion has first and second sides corresponding to the first and second sides of the outlet portion. Each of the first and second sides of the inlet portion includes one or more tubular members connectable with corresponding tube joints and a mixing chamber fluidly interposed between each of the one or more tubular members and the outlet portion.

Methods and systems are provided to control exhaust energy delivered to a turbine of a turbine-generator coupled to a split exhaust engine system in order to limit turbine over-speed conditions and/or reduce generator vibration or reduce component over-heating conditions. In one example, a method may comprise in response to turbine speed greater than a threshold speed, selectively deactivating a first exhaust valve of one or more cylinders of a first and second cylinder group.

A system and method for utilizing fuel as an on-board reductant for selective catalytic reduction of NOx is provided and includes a controller for controlling an engine to produce a lean first exhaust stream and a rich second exhaust stream that are received in respective first and second passageways of a dual path aftertreatment system. The rich second exhaust stream reacts with NOx stored in a NOx storage and reduction catalyst of the second passageway to regenerate this catalyst and generate ammonia. The first exhaust stream and the second exhaust stream having the generated ammonia are combined in a downstream common passageway to form a combined lean exhaust gas stream where the ammonia carried therein is stored or used by an SCR catalyst of the common passageway for NOx reduction. The engine is subsequently controlled to produce a rich first exhaust stream and a lean second exhaust stream.

A sinuous balanced mid-pipe exhaust system has a straight mid-pipe and a sinuous mid-pipe disposed intermediate manifold and muffler. The manifold has a differential bilateral manifold pipe length. The longer manifold pipe connected to the straight mid-pipe and the shorter manifold pipe connected to the sinuous mid-pipe. Sinuous mid-pipe has 2-3 sinusoidal curved segments such that a sinuous gas flow path therethrough substantially equals the straight pipe flow path length and the manifold differential pipe length. The method balances and equalizes gas flows by defining straight gas flow path, having a path length and defining a sinuous gas flow path with at least two sinusoidal segments which is equal to the path length and the differential path length.

Embodiments for operating an engine having parallel turbochargers and two fluidically coupleable, separated intake manifolds is provided. In one example, a method includes responsive to a first condition, operating a first cylinder group of an engine, deactivating a second cylinder group of the engine, and blocking fluidic communication between a first intake manifold coupled to the first cylinder group and a second intake manifold coupled to the second cylinder group, and responsive to a second condition, activating the second cylinder group and establishing fluidic communication between the first and second intake manifolds.

Methods and systems are provided for a 2-port integrated exhaust manifold for an inline-3, inline-6, V-6, and/or V-12 engine. In one example, a system may include an exhaust manifold integrated within a cylinder head of an engine block. The integrated exhaust manifold may include a first set of two runners from a first outer cylinder coupled to a first manifold exhaust port, a second set of two runners of a second outer cylinder coupled to a second manifold exhaust port, and one runner of an inner cylinder coupled to the first manifold exhaust port and another runner of the inner cylinder coupled to the second manifold exhaust port.

A multi-cylinder engine exhaust structure disclosed herein includes: four branched exhaust pipes respectively communicating with four cylinders classified into two groups, each being comprised of two of the four cylinders with discontinuous exhaust strokes; two intermediate collecting pipes, each being formed by combining associated two of the four branched exhaust pipes respectively communicating with the two cylinders in an associated one of the two groups; a last collecting pipe formed by combining these intermediate collecting pipes; and an exhaust gas purifier coupled to an exhaust gas downstream end of the last collecting pipe. Two of the four branched exhaust pipes respectively communicating with two of the four cylinders to be activated as two active cylinders while the engine is performing a cylinder-cutoff operation are shorter than the two other branched exhaust pipes respectively communicating with the two other cylinders to be deactivated as two idle cylinders during the cylinder-cutoff operation.