A reductant injecting device includes: a honeycomb structure comprising: a pillar shaped honeycomb structure portion having a partition wall that defines a plurality of cells each extending from a fluid inflow end face to a fluid outflow end face; and at least one pair of electrode portions arranged on a side surface of the honeycomb structure portion; an inner cylinder being configured to house the honeycomb structure; a urea sprayer arranged at one end of the inner cylinder; and an outer cylinder arranged on an outer peripheral side of the inner cylinder, the outer cylinder being spaced apart from the inner cylinder. A flow path through which the carrier gas passes is formed between the inner cylinder and the outer cylinder.

An aftertreatment system connected downstream an internal combustion engine arrangement for receiving exhaust gases conveyed from the internal combustion engine arrangement during operation thereof, wherein the aftertreatment system comprises first and second catalytic devices in series, wherein a gap is there between.

A muffler including a double-pipe structure to muffle sounds in two or more frequencies is provided. The muffler includes an inner and outer pipes with a clearance therebetween. The inner pipe includes a first and second outer surfaces, and, at one end, an opening communicating with the outer pipe. The clearance communicates with an exhaust passage via the opening. The second outer surface forms the opening and is situated closer to the center of the inner pipe than the first outer surface is. A space between the inner and outer pipes is closed due to a contact between the first outer surface and an inner-circumferential surface of the outer pipe. A part of the clearance is formed between the first outer surface and the inner-circumferential surface. The outer-circumferential surfaces of the inner pipe include at least one communication hole that communicates the inner pipe with the clearance.

An exhaust gas after-treatment mixing device comprises a casing, a mixing pipe located in the casing and a partition plate separating the casing into an upstream space and a downstream space. The mixing pipe comprises a first pipe portion located in the upstream space and a second pipe portion located in the downstream space. The first pipe portion is provided with at least two first openings located on two sides of the first pipe portion, respectively. A shielding plate shields an upstream portion of at least one of the first openings. The shielding plate is shaped and positioned within the casing to urge exhaust gas flowing through the upstream space away from the first end of the mixing pipe and around the shielding plate prior to entering the first openings.

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 heat recovery device, including a pillar-shaped honeycomb structure comprising an outer peripheral side wall having one or more planar outer peripheral side surfaces; one or more thermoelectric conversion modules arranged to face the one or more planar outer peripheral side surfaces; a tubular member that circumferentially covers the outer peripheral side surfaces of the honeycomb structure and the one or more thermoelectric conversion modules; and a casing that circumferentially covers the tubular member; wherein the partition walls are mainly configured of ceramics; and wherein the casing has an inflow port and an outflow port for a second fluid having a temperature lower than that of the first fluid, and a flow path for the second fluid is formed circumferentially around the tubular member between an inner surface of the casing and an outer surface of the tubular member.

Unit for reduction of exhaust gases for an IC engine. The unit has a cylindrical housing with gas inlet and outlet openings and injector for a reducing substance. A helicoid is coaxially arranged inside the housing. A channel conveys the exhaust gases, has a substantially quadrangular cross-section, and helicoidally develops inside the unit. The helix is generated by the intersection between the inner surface of the housing and the helicoid has an inclination angle (β) relative to planes perpendicular to the generatrices of the cylindrical housing ranging from 0° to 30°. The unit includes a coaxial stiffening and stabilization sleeve located at the center of the helicoid passing axially throughout the helicoid and axially over a length at least equal to the axial length of the helicoid. The sleeve cooperates with the inner surface of the housing and with the opposite surfaces of the helicoid to define the helicoidal channel.

An emission signature modification device for modifying an acoustic signature of an exhaust gas stream, including an exhaust gas guiding device that guides the exhaust gas stream in the flow direction thereof from an inlet area to an outlet area. An active acoustic emission modification device modifies the acoustic emission of the exhaust gas stream in predetermined operating states. If an actuator system of the active acoustic emission modification device is designed such that in a circumferential direction, the actuator system is surrounded by more than 30% of the guided exhaust gas stream, the actuating system can be protected against harmful influences from the environment by way of the exhaust gas guiding device on the one hand, and on the other hand, the required space signifier can be reduced as compared to a lateral, external arrangement of the actuating system.

An exhaust muffler is made up of a plurality of layers including an exhaust passage pipe and expansion chambers, and includes a front assembly and a rear assembly sub-assembled separately from the front assembly. The front assembly includes a front exhaust passage pipe, a front muffler body disposed in covering relation to the outside of the front exhaust passage pipe and cooperating with the front exhaust passage pipe in making up double-walled pipes, and an exhaust valve disposed in the front exhaust passage pipe. The rear assembly includes a rear exhaust passage pipe and a rear muffler body disposed in covering relation to the outside of the rear exhaust passage pipe and cooperating with the rear exhaust passage pipe in making up double-walled pipes. There is thus provided an exhaust device for an internal combustion engine in which the accuracy of a position where the exhaust valve is installed is high.

A flowhood is provided to which an upstream conduit and a downstream conduit of an emissions cleaning module can be connected includes a first section and a second section. The second section includes a first aperture for connection to the upstream conduit and a second aperture for connection to the downstream conduit. The first and second apertures may face substantially in the same direction to permit a compact arrangement. A body of the first section may be shaped to channel gas flow from the first aperture to the second aperture. An emissions cleaning module including such a flowhood is also described.