An exhaust-gas guiding housing for an exhaust-gas system of an internal combustion engine includes an air inlet housing part through which exhaust gas can flow in an exhaust-gas main flow direction and which has a housing wall surrounding a housing longitudinal axis. At least one air inlet opening is provided in at least one air inlet peripheral region of the housing wall. An inner wall is provided at an inner side of the air inlet housing part, which inner wall, together with the housing wall, defines an air inlet chamber. The at least one air inlet opening is open to the air inlet chamber. At least one air passage opening is provided in the inner wall, and/or at least one air passage opening is formed between the inner wall and the housing wall.

There is described a component of an exhaust system for an internal combustion engine, which includes a wall in which at least one opening is provided. A perforated cover (16) at least partly closes the opening, wherein the cover (16) is mounted on the wall by means of a holder (18), and a portion (32, 34) of the cover (16) engages into an opening (28, 30) provided on the holder (18). There is also presented an exhaust system comprising such a component, and a method for manufacturing such a component, in which the cover (16) is mounted on the holder (18) by introducing at least one portion (32, 34) of the cover (16) into an opening (28, 30) provided on the holder (18).

Disclosed is a water ingress preventive structure for a tailpipe which discharges exhaust gas outside of a vehicle at a terminal of an exhaust passage system. A curved shape is imparted to the tailpipe. A partition is mounted on an inner periphery of a curved portion outward of a curved direction so as to be gradually spaced apart from the inner periphery toward downstream in a direction of flow of the exhaust gas. Thus, a dead end portion is defined by the partition and the inner periphery of the curved portion outward of the curved direction.

A vehicle exhaust system includes a tubular component having an inner surface and an outer surface such that the inner surface defines a primary exhaust gas flow path and wherein the tubular component extends along a central axis from an inlet end to an outlet end. The tubular component comprises at least one ridge along the central axis. The at least one ridge extends at least partly along a circumference of the tubular component. Each ridge includes a first portion angularly devoid of apertures and extending inwardly from the tubular component and a second portion disposed downstream of the first portion. The second portion is angularly devoid of apertures and extends inwardly from the tubular component. The tubular component also includes a plurality of spaced apertures positioned along a portion of the circumference of the tubular component and downsteam of the second portion.

A drip-irrigation catalytic reduction exhaust pipe includes an exhaust pipe having a pipe wall in which a plurality of first apertures is formed and a plurality of direct-through ceramic filters arranged in the exhaust pipe in an axial direction from an exhaust gas inlet opening toward the exhaust gas outlet opening, or alternatively, a wall-flow filter being arranged at a location that is closest to the exhaust gas outlet opening. A flow guide tube is arranged outside the exhaust pipe and is connected to a container and includes a plurality of second apertures. The second apertures respectively correspond to the first apertures. An electromagnetic valve controls passage of urea liquid contained in the container through the second apertures and the first apertures to drip into the exhaust pipe and absorbed by a ceramic fiber material for penetration into pores of the direct-through ceramic filters and the wall-flow filter.

A muffler comprises a plurality of tubes disposed within an inner chamber. The holes are at least partially punched through the tubes so that hanging chads extend into the tubes at each hole. The tubes form a serpentine flow-path through the chamber through which exhaust flows. One or more diffusion brackets are also disposed within the chamber and downstream from one or more tube outlets.

An exhaust after-treatment assembly for an engine system is provided. The exhaust after-treatment assembly includes a housing having an inlet port, an outlet port, a catalyst disposed within a cavity defined by the housing, and a muffler assembly disposed within the cavity downstream of the catalyst. The muffler assembly includes one or more baffle plates disposed longitudinally spaced from one another within the housing to define at least a first resonator chamber and a second resonator chamber. Each of the baffle plates defines an openings aligned to one another about a longitudinal axis of the housing. Further, a resonator tube extends through the openings of the baffle plates and includes an inlet, a perforated portion and one or more outlet ports formed in a wall of the resonator tube. The perforated portion and the outlet ports, respectively in fluid communication with the second resonator chamber and the first resonator chamber.

An exhaust duct assembly for conveying exhaust gases emanating from a combustion zone to atmosphere is disclosed. The assembly includes: an exhaust gas outlet for exhausting exhaust gas into the atmosphere; and an acoustic duct portion located upstream of the exhaust gas outlet, the acoustic duct portion having a peripheral wall defining a through-passage arranged and constructed to promote propagation of sound there-through. The acoustic duct portion has a length in a flow direction that is at least 50% of an average hydraulic diameter of the through-passage.

An aftertreatment component includes an inlet connector tube, an outlet connector tube, a chamber, a flow dissipater, and a substrate. The inlet connector tube receives exhaust gasses. The chamber is between the inlet connector tube and the outlet connector tube. The flow dissipater is positioned around the inlet connector tube and within the chamber. The flow dissipater receives the exhaust gasses from the inlet connector tube and includes a plurality of perforations. The plurality of perforations defines an open area of the flow dissipater. The open area of the flow dissipater is greatest proximate to the inlet connector tube and progressively decreasing proximate to the outlet connector tube. The substrate is positioned within the chamber and receives the exhaust gasses from the flow dissipater and provides the treated exhaust gasses to the outlet connector tube. The exhaust gases are expelled through the flow dissipater via the plurality of perforations.

A device that includes a conduit, a first window, a second window, a first catalyzed layer, a second catalyzed layer, an optical source, and an optical detector is disclosed. The conduit may be configured to receive an exhaust gas. The first catalyzed layer may be disposed on the first window and the second catalyzed layer may be disposed on the second window. The first catalyzed layer and the second catalyzed layer may be configured to cause a reaction with soot in the exhaust gas at an activation temperature to reduce accumulation of the soot on the first window and the second window. The optical source may be configured to emit a beam of light into the conduit through the first window. The optical detector may be configured to receive at least a portion of the beam of light through the second window.