An internal combustion engine includes a cylinder case forming a plurality of coolant outlets, and an exhaust log structure disposed on the cylinder case and including inner and outer walls defining a coolant jacket therebetween, a plurality of coolant inlets extending through the outer wall and being fluidly connected to the coolant jacket, and a plurality of transfer housings. Each transfer housing includes an inner housing wall forming a gas passage, an outer housing wall disposed at an offset distance around the inner housing wall such that a cooling passage is defined in a space between the inner and outer housing walls, and a coolant inlet and a coolant outlet in fluid communication with the cooling passage. The plurality of coolant inlets is fluidly connected to the plurality of coolant outlets via the cooling passages in the plurality of transfer housings.

An insulation system for an aftertreatment system includes a first insulating element including at least one slit, and a second insulating element including a plurality of fingers extending from opposing sides of an aperture. The second insulating element is couplable to the first insulating element, and when the second insulating element is coupled to the first insulating element, the plurality of fingers overlap the at least one slit.

A heat shield for shielding hot regions of a component is described. The component may be an exhaust manifold with a heat shield and also an internal combustion engine with an exhaust manifold or heat shield.

An internal combustion engine system includes at least one combustor, a compressor arranged to compress air, an air guide arranged to guide compressed air from the compressor to at least one of the at least one combustor, an expander arranged to expand exhaust gases from at least one of the at least one combustor and to extract energy from the expanded exhaust gases, and an exhaust guide arranged to guide exhaust gases from at least one of the at least one combustor to the expander, wherein the exhaust guide is at least partly integrated with the air guide.

An aftertreatment system includes: a selective catalytic reduction system including at least one catalyst for decomposing constituents of an exhaust gas produced by an engine, the exhaust gas having a pressure pulsation frequency; an exhaust conduit fluidly coupled to the selective catalytic reduction system and structured to deliver the exhaust gas to the selective catalytic reduction system from the engine; at least one mixer positioned in the exhaust conduit; and a reductant insertion assembly fluidly coupled to the exhaust conduit and structured to insert a reductant into the exhaust conduit upstream of the at least one mixer. The at least one mixer is structured to have a natural frequency matching the pressure pulsation frequency so as to cause resonant vibration in the at least one mixer, the resonant vibration causing reductant deposits to be removed from the at least one mixer.

Methods and systems are provided for using thermoelectric generators to recover waste heat from and diagnose turbocharger systems. In one example, a method may include adjusting one or more engine operating parameters based on an amount of current generated from one or more thermoelectric generators coupled to a turbocharger.

An exhaust plenum chamber with a thermal barrier coating for an opposed-piston engine reduces heat rejection to coolant, while increasing exhaust temperatures, fuel efficiency, and quicker exhaust after-treatment light-off. The exhaust plenum chamber can include a coating on the inside surface of the chamber. Posts which are structural and provide cooling channels or passageways can be present in the exhaust plenum chamber and coated with the thermal barrier coating material.

An exhaust manifold assembly with a thermal barrier coating for an opposed-piston engine reduces heat rejection to coolant, while increasing exhaust temperatures, fuel efficiency, and quicker exhaust after-treatment light-off. The exhaust manifold assembly can include a coating on the inside surface of the manifold assembly. The coated exhaust manifold assembly can ensure structural robustness of the exhaust manifold assembly over a larger range of operating temperatures.

A heat insulating structure of an internal combustion engine (engine 1) includes a cylinder-head-side heat insulating cover (30) and a cylinder-block-side heat insulating cover (40). Each of the first side walls (32) of the cylinder-head-side heat insulating cover (30) is disposed outwardly of, and is spaced apart from, a corresponding one of the second side walls (43) of the cylinder-block-side heat insulating cover (40) in the width direction of the vehicle. The lower edge of each of the first side walls (32) is positioned below the upper edge of the corresponding one of the second side walls (43) to overlap with the corresponding one of the second side walls (43) when viewed from the side of the vehicle.

A method for applying a thermal barrier coating (TBC) to a surface of a cast component includes providing a core, applying the TBC to the core to form a coated core, disposing the coated core within a casting mold, casting metal around at least a portion of the coated core to form a casting intermediary, and removing the core from the casting intermediary to form a cast component. The TBC includes hollow microspheres comprising metal, glass, and/or ceramic materials. The hollow microspheres can have an average diameter of about 10 m to about 100 m. The component can be an automotive component, such as an engine intake assembly, an engine exhaust manifold, an engine block, and/or an engine cylinder head. The surface of the cast component can be one or more surfaces which define an engine intake passage, an engine exhaust passage, and an engine combustion chamber.