This multi-cylinder internal combustion engine (1) is provided with an EGR device (30) containing an EGR cooler (27), a valve overlap period in which valve opening periods of intake valves (20) and exhaust valves (21) overlap one another is set, and the multi-cylinder internal combustion engine (1) has four cylinders (2). The multi-cylinder internal combustion engine (1) comprises: four exhaust side branch conduits (15), one provided for each of the cylinders (2); a storage tank (31) configured to store condensed water (CW) generated by the EGR cooler (27); and four condensed water introduction conduits (33), one provided for each of the exhaust side branch conduits (15) and communicating the exhaust side branch conduit (15) with the storage tank (31).

The combination of a reservoir having an interface defining an aperture, the interface including a wall extending into the reservoir, the reservoir having a recessed groove in an upper surface about the aperture, the recessed groove including a plurality of recesses thereon: a head unit having an exterior shape complementary to the shape of the aperture, the head unit being positioned within the aperture; the head unit having an inwardly extending rim corresponding to the aperture circular wall, the head unit including a lug, the head unit lug engaging one of recesses, the head unit having a seal ring about an outer periphery of the head unit inwardly extending rim, the seal ring engaging the aperture wall and the head unit inwardly extending rim.

An after-treatment system includes, in series along an exhaust gas flow direction through the after-treatment system: a diesel oxidation catalyst (DOC), a diesel exhaust fluid (DEF) delivery device, a soot-reducing device and a selective catalytic reduction (SCR) catalyst.

Methods and systems are provided for injecting water during an engine cylinder deactivation event so as to reduce an exhaust catalyst regeneration requirement following the cylinder deactivation. In one example, water is injected at one or more deactivated engine cylinders to reduce oxidation of the exhaust catalyst. Then, during engine cylinder reactivation, a degree of richness of a combustion air-to-fuel ratio may be reduced to decrease fuel penalty to the engine while reducing NOx emission.

The present disclosure is directed at a ruthenium based catalyst for NOx reduction. More specifically, ruthenium based catalysts are used for NOx reduction in an internal combustion engine to reduce NO.sub.X to nitrogen, at relatively high conversion and selectivity, using carbon monoxide and hydrogen as reductants. The ruthenium based catalyst has particular utility in exhaust gas recirculation such as in dedicated exhaust gas recirculation (D-EGR) systems.

A vehicle exhaust system includes a mixer having an inlet that receives engine exhaust gases and an outlet to direct swirling engine exhaust gas to a downstream exhaust component. The mixer has a plurality of internal surfaces that come into contact with the engine exhaust gases. At least one of the internal surfaces has a coating comprised of a low-coefficient of friction material.

A vehicle exhaust system includes a mixer having an inlet that receives engine exhaust gases and an outlet to direct swirling engine exhaust gas to a downstream exhaust component. The mixer has a plurality of internal surfaces that come into contact with the engine exhaust gases. At least one of the internal surfaces has a coating comprised of a low-coefficient of friction material.

The invention relates to a storage tank (12) of a metering system (10) for introducing a reducing agent (32) in an exhaust gas tract of an internal combustion engine. The storage tank (12) comprises at least one opening (50) for mounting components (20, 24) and openings (46, 48, 63) for filling and emptying as well as venting (62). All openings (46, 48, 50, 62) are arranged above a region of the storage tank (12) flooded by the reducing agent (32).

A mixing device for mixing and injected additive with an exhaust gas stream comprises a tubular housing including an exhaust gas inlet and an exhaust gas outlet. An intermediate wall is positioned within the tubular housing between the exhaust gas inlet and the exhaust gas outlet. A mixing chamber includes an inflow opening in fluid communication with the exhaust gas stream and the injected additive. The mixing chamber is at least partially defined by the intermediate wall. A first deflector is positioned on the intermediate wall and within the mixing chamber. The first deflector is oriented to deflect a first auxiliary exhaust gas stream passing through the intermediate wall in a radial and/or circumferential direction.

The present disclosure is directed at a ruthenium based catalyst for NOx reduction. More specifically, ruthenium based catalysts are used for NOx reduction in an internal combustion engine to reduce NO.sub.x to nitrogen, at relatively high conversion and selectivity, using carbon monoxide and hydrogen as reductants. The ruthenium based catalyst has particular utility in exhaust gas recirculation such as in dedicated exhaust gas recirculation (D-EGR) systems.