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.

A device for supplying a chemical reactant into the exhaust system of an internal combustion engine, comprising: a mixer housing having an inlet opening through which the exhaust flow enters the mixer housing; a metering pipe passing through the mixer housing, towards which the exhaust flow flowing into the mixer housing flows in a transverse direction, and having a first end and a second end; a metering unit which is arranged at the first end of the metering pipe and can be connected to a reactant supply for discharging reactant into the metering pipe; and means for generating a swirl flow of the exhaust flow within the metering pipe. For this purpose, the metering pipe has at least one inflow opening extending over a casing surface segment of no less than 45° in the circumferential direction and extending over at least one section of the length of the metering tube located within the mixer housing, said in-flow opening having a shovel-like hood arranged on the metering pipe and directing the exhaust flow eccentrically into the in-flow opening.

A mixer is adapted to include: a flow path forming member formed with an internal flow path; and an insertion member inserted into the internal flow path, in which: the inner circumferential surface forming the internal flow path in the flow path forming member or the outer circumferential surface of the insertion member is formed with a first groove and a second groove merging with the first groove and branching from the first groove, and the inner circumferential surface and the outer circumferential surface are fitted to each other; and the first groove and the second groove are formed as a mixing flow path for, between the flow path forming member and the insertion member, branching and merging fluid flowing from one side of the internal flow path and guiding the fluid to the other side of the internal flow path.

A mixer is provided for mixing exhaust gas (A) flowing in an exhaust gas-carrying duct (14) of an internal combustion engine with reactant injected into the exhaust gas-carrying duct (14). The mixer includes a mixing body (22) with a reactant-receiving duct (34), an exhaust gas inlet opening device (54) with a plurality of exhaust gas inlet openings (56) leading to the reactant-receiving duct (34), and at least one releasing duct (40, 42) leading away from the reactant-receiving duct (34) with a releasing duct opening (48, 50) for releasing a reactant/exhaust gas mixture from the mixer body (22). An electrically energizable heater (68) is provided at the mixer body (22).

An exhaust gas purification device includes a selective catalytic reduction (SCR) device arranged in a downstream exhaust flow path, and a mixer arranged upstream of the selective catalytic reduction device and including a helical flow path that helically guides the flow of exhaust gas from an internal combustion engine. In the exhaust gas purification device, the mixer includes a casing, an injector, and a partition plate. The casing has an upstream opening and a downstream opening and is provided with the helical flow path therein. The injector is arranged in the helical flow path to add a reducing agent to the helical flow path. The partition plate is continuous from the upstream opening to the downstream opening. The partition plate is arranged to divide the inner space of the casing into an upstream side and a downstream side, and defines the helical flow path.

An exhaust system for an internal combustion engine includes an oxidation catalytic converter unit (12) with a first catalytic converter housing with a first housing axis (A.sub.1). An SCR catalytic converter unit (18) has a second catalytic converter housing (20), with a second housing axis (A.sub.2). A mixer housing (16) has an upstream connection area (24) adjoining a downstream end (26) of the first catalytic converter housing (14) and has a downstream connection area (28) adjoining an upstream end (30) of the second catalytic converter housing. A mixer (48) is carried in the mixer housing. A reactant release device (56) at the mixer housing releases reactant into a reactant-receiving duct (72) of the mixer. The mixer housing includes a first housing part (36) forming the upstream connection area (24) and a second housing part (38) forming the downstream connection area together with the first housing part.

A mixer assembly unit, for an exhaust system exhaust gas treatment unit of an internal combustion engine, mixes exhaust gas discharged by the internal combustion engine with reactant. A mixing section (12), downstream in relation to a reactant release device (14), mixes exhaust gas, flowing in an exhaust gas flow direction, with reactant. The mixing section includes a core flow duct (34), extending in a direction of a mixing section longitudinal axis (L), through which a first exhaust gas partial stream (T1) flows. A second exhaust gas partial stream (T2) flows through a jacket flow duct (36) surrounding the core flow duct and separated from the core flow duct by an inner wall (30). The reactant release device releases reactant into the core flow duct or/and into the first exhaust gas partial stream. A mixer (38) is provided at an upstream end area (22) of the mixing section.

A method for causing exhaust gas flow to flow at least 270 degrees in a first direction about a perforated tube using a baffle plate having a main body with a plurality of flow-through openings and a plurality of louvers positioned adjacent to the flow-through openings. The method includes deflecting a first portion of the exhaust gas flow with the main body of the baffle plate. The method also includes allowing a second portion of the exhaust gas flow to flow through the flow-through openings of the baffle plate. The method also deflects the second portion of the exhaust gas flow at a downstream side of the main body with the louvers hereby causing the second portion of the exhaust gas flow to flow in the first direction about the perforated tube.

An engine and a double-swirl mixing device thereof are provided. The double-swirl mixing device includes a mixing tube configured to mix exhaust gas with urea, a tapered mixer including a tapered tube having an outlet end extending into the mixing tube, and a plurality of tapered swirl plates which are arranged along a circumferential direction on a side wall of the tapered tube, and a fan-type blade arranged at the outlet end of the tapered tube, and a diameter of an inlet end of the tapered tube is smaller than a diameter of the outlet end of the tapered tube.

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 diverter has at least one first opening that is open to the interior cavity and a second opening that surrounds the cone outlet. Exhaust flow is directed by the diverter to the cone inlet opening to be mixed with a fluid injected through the doser opening.