A mixing device of an exhaust gas purification system of an internal combustion engine is disclosed. The mixing device includes swirl tube, a mixing tube arranged in the swirl tube, and an exhaust gas supply tube leading into the swirl tube such that exhaust gas can enter the swirl tube tangentially from the exhaust gas supply tube through a cut-out opening in the lateral surface of the swirl tube and forms a flow rotating around the mixing tube. The exhaust gas completely enters the mixing tube and leaves the interior of the swirl tube completely through the mixing tube. A metering device can spray urea solution into the swirl tube such that the urea solution enters the mixing tube and is entrained by the rotating flow of the exhaust gas and is discharged from the swirl tube through the mixing tube together with the exhaust gas.

A mixing chamber for mixing an additive in an exhaust system of an internal combustion engine includes a housing, a flow-guiding element and a downstream substrate. The flow-guiding element is arranged within the housing between an inlet opening and an outlet opening. The flow-guiding element is tubular and forms a channel including a channel wall, one inlet and one outlet, via which all of the exhaust gas is guided through the channel to the outlet.

An apparatus for aftertreatment of exhaust gas includes a housing an exhaust inlet, a first flow guide to guide at least part of exhaust gas to a first direction to form a first direction flow, and a reactant inlet for dispensing reactant to the first direction flow in an inner cavity to mix with the exhaust gas to provide a mixed exhaust gas. A second flow guide guides at least a part of the first direction flow to a second direction to form a second direction flow opposite to the first direction, and guide the second direction flow to a third direction to form a third direction flow downstream to the second direction and parallel to the first direction. An exhaust outlet exits output exhaust gas from the inner cavity; mixing of the reactant and the exhaust gas occurring within the first, second and third direction flow.

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.

A mixer for a vehicle exhaust system includes a mixer housing that defines an interior cavity for engine exhaust gases, and which includes a doser opening formed within a wall of the mixer housing. A cone has a cone inlet opening aligned with the doser opening and a cone outlet into the interior cavity. A cylindrical member surrounds at least a portion of the cone and includes at least one window opening. At least one diverter duct is fixed to the mixer housing and has a first duct end open to the interior cavity and a second duct end at least partially overlapping the at least one window opening such that a portion of the engine exhaust gases in the interior cavity is directed to enter the first duct end, flow through the at least one window and then flow into the cone inlet opening to be mixed with a fluid injected through the doser opening.

A lattice board is obliquely arranged in a bent portion halfway in an exhaust pipe where exhaust gas flows curvedly so as to bisect an angle made by inflow and outflow directions the exhaust gas entered upstream of and discharged downstream of the bent portion, respectively. An injector is arranged in the outflow direction of the exhaust gas to inject urea water to an entry side of the lattice board such that flow passage walls of the lattice board on which hit is the exhaust gas from upstream has rear surfaces on which hit is a spray of urea water from the injector.

An exhaust gas treatment system includes a selective catalytic reduction device (SCR); a reductant injector upstream from the SCR and configured to communicate reductant into the SCR via a conduit defined by an outer periphery, a first mixer disposed within the conduit upstream from the reductant injector, and a second mixer disposed within the conduit downstream from the reductant injector and upstream from the SCR. Each of the first mixer and the second mixer comprises a plurality of blades extending between a center region of the conduit to the conduit periphery, wherein each of the blades at least partially obstructs fluid flow through the conduit and are angled relative to a cross sectional plane of the conduit such that fluid flow is permitted between adjacent blades, and the plurality of blades form a turbulence plane defined by a plane angle measured from the two outermost blades of the turbulence plane.

A dosing and mixing arrangement including an exhaust conduit defining a central axis; a mixing conduit positioned within the exhaust conduit; a dispersing arrangement (e.g., a mesh) disposed at the upstream end of the mixing conduit; an injector coupled to the exhaust conduit and configured to direct reactants into the exhaust conduit towards the mesh; and an annular bypass defined between the mixing conduit and the exhaust conduit for allowing exhaust to bypass the upstream end of the mixing conduit and to enter the mixing conduit downstream of the mesh.

An apparatus for aftertreatment of exhaust gas including a housing having a longitudinal axis that extends between a first end and a second end of the housing; an exhaust inlet being positioned at a portion of the first end of the housing for entering exhaust gas flow into the interior of the housing; a first substrate being positioned within the interior of the housing downstream to the exhaust inlet, wherein the exhaust gas flow being configured to flow through the first substrate in direction of the longitudinal axis; mixer arrangement being positioned within the interior of the housing downstream to the first substrate and including: first flow guide arrangement configured to guide the exhaust gas flow to rotating and advancing gas flow in direction of a crosswise axis perpendicular to the longitudinal axis; a reactant inlet for dispensing reactant to the rotating and advancing gas flow, the reactant configured to mix with the exhaust gas; and second flow guide arrangement configured to guide the rotating and advancing mixed gas flow in direction of the longitudinal axis as a mixed exhaust gas flow; and a second substrate being positioned within the interior of the housing downstream to the mixer arrangement, wherein the mixed exhaust gas flow being configured to flow through the second substrate in direction of the longitudinal axis.

A method for controlling fluid ratio accuracy during a dual flow injection with a powered injection system is described. The method includes predicting a first capacitance volume of a first syringe comprising a first medical fluid and a second capacitance volume of a second syringe comprising a second medical fluid with a first capacitance correction factor and a second capacitance correction factor, respectively, selecting a ratio of the first medical fluid and the second medical fluid to be administered to a patient in the dual flow injection, determining a relative acceleration ratio of a first piston of the first syringe and a second piston of a second syringe based on the predicted first capacitance volume and the predicted second capacitance volume, wherein the relative acceleration ratio is selected to maintain the selected ratio of the first medical fluid and the second medical fluid during the dual flow injection, and injecting a mixture of a first medical fluid and a second medical fluid having the selected ratio with the powered injection system.