A multi-stage mixer includes a multi-stage mixer inlet, a multi-stage mixer outlet, a first flow device, and a second flow device. The multi-stage mixer inlet is configured to receive exhaust gas. The multi-stage mixer outlet is configured to provide the exhaust gas to a catalyst. The first flow device is configured to receive the exhaust gas from the multi-stage mixer inlet and to receive reductant such that the reductant is partially mixed with the exhaust gas within the first flow device. The first flow device includes a plurality of main vanes and a plurality of main vane apertures. The plurality of main vane apertures is interspaced between the plurality of main vanes. The plurality of main vane apertures is configured to receive the exhaust gas and to cooperate with the plurality of main vanes to provide the exhaust gas from the first flow device with a swirl flow.

A vehicle exhaust system includes an inlet module configured to receive engine exhaust gas and a mixer housing defining an internal cavity that receives engine exhaust gas from the inlet module. An injection component is positioned within the internal cavity and has a fluid inlet and a fluid outlet to direct injected fluid into the internal cavity to mix with the engine exhaust gas. The injection component defines an injection axis and includes an inner structure defining an inner gas flow path and an outer structure defining an outer gas flow path that is between the inner and outer structures and radially outward of the inner gas flow path to improve mixing at the fluid outlet. An outlet module is configured to direct a mixture of engine exhaust gas and fluid to a downstream exhaust component.

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 fluid-conduit collector spans across a plurality of collector-inlet interface structures and at least one fluidic diode element. A branch inlet portion of at least one collector-inlet interface structure, in fluid communication with a corresponding fluid-conduit runner portion, provides for receiving exhaust gases from a corresponding separate exhaust port of an intermittent-combustion internal combustion engine. A main inlet portion of the collector-inlet interface structure in fluid communication with an outlet portion thereof defines a portion of the fluid conduit of the collector. The branch inlet portion is in fluid communication with the outlet portion via a collector inlet port that is at least partially bounded by a relatively-sharp-edged junction with the fluid conduit of the collector. The fluidic-diode element located coincident with, or downstream of, the collector inlet port provides for a relatively-higher coefficient of discharge for exhaust gases flowing towards an outlet of the collector, than for an associated reverse-directed bulk flow or acoustic pressure wave flowing in a reverse direction.

An exhaust treatment arrangement includes a mixing assembly disposed between first and second substrates; and an injection mounting location disposed at the mixing assembly. The mixing assembly includes a mixing arrangement configured to direct exhaust flow exiting the first substrate in a swirling configuration, a restricting member defining a restricted passage, and optionally a dispersing member configured to even out the exhaust flow.

Method and system for thermal regeneration of a catalyst by inlet turbine exhaust gas from a diesel engine, where a gas split stream (08) is led from the engine exhaust (02) through an eductor (04) and further to regeneration of a catalyst, wherein a cold air stream (09) is used to keep the regeneration gas stream at a desired constant temperature range.

A two-stage venturi cooler comprises a first tubular conduit having a longitudinal axis, the first elongate tubular conduit having an exhaust gas inlet at one end, a mixed gas outlet at an opposing end, and a cooling gas inlet, wherein structures inside the first stage define a venturi that forms a column of mixed gas, wherein the column of mixed gas comprises a ring of exhaust gas surrounding a core of cooling gas; and a second tubular conduit that is coaxial with the first tubular conduit, wherein the second tubular conduit has a mixed gas inlet at one end and a mixed gas outlet at an opposing end, and wherein the mixed gas inlet is to receive the column of mixed gas and to surround the column of mixed gas with an entrained column of ambient air.

The catalytic converter has a first catalyst case containing a catalyst for cleaning a fluid, a second catalyst case containing a catalyst for cleaning the fluid downstream of the first catalyst case, a sensor for detecting the fluid is attached, and a connecting portion connected between the first catalyst case and the second catalyst case, the cross-sectional area of the first flow path of the fluid in the connecting portion is smaller than the cross-sectional area of the second flow path of the fluid in the first catalyst case, the first flow path, the mounting position side of the sensor with respect to the second flow path, the displacement width of the opposite side facing the mounting position is provided so as to be larger than the displacement width.

A fluid-conduit collector (20, 20.x, 20.sup.a, 20.sup.b) spans across a plurality of collector-inlet interface structures (24, 24.1, 24.2, 24.3, 24, 24) and at least one fluidic diode element (26, 26.1, 26.2, 26.3, 26, 26). A branch inlet portion (20, 20.1, 20.2, 20.3) of at least one collector-inlet interface structure (24, 24.1, 24.2, 24.3, 24, 24), in fluid communication with a corresponding fluid-conduit runner portion (14, 14.x), provides for receiving fluid from a source of fluid (12). A main inlet portion (20.x) of the collector-inlet interface structure in fluid communication with an outlet portion (20.x) thereof defines a portion of the fluid conduit of the collector (20, 20.x, 20.sup.a, 20.sup.b). The branch inlet portion (20, 20.1, 20.2, 20.3) is in fluid communication with the outlet portion (20.x) via a collector inlet port (56, 106) that is at least partially bounded by a relatively-sharp-edged junction (60) with the fluid conduit of the collector (20, 20.x, 20.sup.a, 20.sup.b). The fluidic-diode element (26, 26.1, 26.2, 26.3, 26, 26) located coincident with, or downstream of, the collector inlet port (56, 106) provides for a relatively-higher coefficient of discharge for fluid flowing (34, 64) towards (36) an outlet (38) of the collector (20, 20.x, 20.sup.a, 20.sup.b), than for fluid flowing (32) in a reverse direction (40).

An exhaust treatment arrangement includes a mixing assembly disposed between first and second substrates; and an injection mounting location disposed at the mixing assembly. The mixing assembly includes a mixing arrangement configured to direct exhaust flow exiting the first substrate in a swirling configuration, a restricting member defining a restricted passage, and optionally a dispersing member configured to even out the exhaust flow.