Abstract: A selective catalytic reduction (SCR) system is disclosed. The SCR system may include a mixing tube with a mixing tube inlet; a diesel exhaust fluid (DEF) injector proximate to the mixing tube inlet; and a flow control device proximate to the mixing tube inlet, wherein the flow control device is positioned within the mixing tube or affixed to the mixing tube inlet, and wherein the flow control device includes a plurality of vanes arranged around a center of the flow control device.

Abstract: A selective catalytic reduction (SCR) system is disclosed. The SCR system may include a mixing tube with a mixing tube inlet; a diesel exhaust fluid (DEF) injector proximate to the mixing tube inlet; and a flow control device proximate to the mixing tube inlet, wherein the flow control device is positioned within the mixing tube or affixed to the mixing tube inlet, and wherein the flow control device includes a plurality of vanes arranged around a center of the flow control device.

Abstract: A reductant impingement device includes a proximal end having an impingement pin with a convex surface; and a distal end having a body concentric with a longitudinal axis of the impingement pin. The distal end includes a first surface and a second surface opposite the first surface. A plurality of inner channels connects the first surface and the second surface, and a plurality of outer channels connects the first surface and the second surface, where the plurality of inner channels are disposed in a circular array at a first radial distance from a longitudinal axis of the impingement pin, and the plurality of outer channels are disposed in a circular array at a second distance from the longitudinal axis of the impingement pin.

Abstract: A nozzle including a nozzle body having a proximal end and a distal end. The proximal end includes at least a first inlet and a second inlet, and the distal end includes an outlet. An inner tube extends in a direction along a central longitudinal axis of the nozzle and at least partly defines a first channel fluidly connected to the first inlet and a second channel fluidly connected to the second inlet. The second channel fluidly connects to the first channel via one or more orifices extending through the inner tube.

Abstract: A reductant impingement device includes a proximal end having an impingement pin with a convex surface; and a distal end having a body concentric with a longitudinal axis of the impingement pin. The distal end includes a first surface and a second surface opposite the first surface. A plurality of inner channels connects the first surface and the second surface, and a plurality of outer channels connects the first surface and the second surface, where the plurality of inner channels are disposed in a circular array at a first radial distance from a longitudinal axis of the impingement pin, and the plurality of outer channels are disposed in a circular array at a second distance from the longitudinal axis of the impingement pin.

Abstract: An exhaust aftertreatment system includes a housing including first and second axial ends. An exhaust inlet is disposed adjacent the first axial end. An exhaust outlet is disposed adjacent the second axial end. A catalytic converter is disposed between the first and second axial ends. A diffuser is disposed inside the housing between the first axial end and the catalytic converter. The diffuser includes a shell in communication with the exhaust inlet. The shell includes proximal and distal portions and a front side facing the catalytic converter. The proximal and distal portions are substantially equal in frontal area. The proximal portion is adjacent the exhaust inlet and includes a first plurality of front side openings totaling a first open area and the distal portion includes a second plurality of front side openings totaling a second open area. The first open area is about 1.8-2.2 times the second.

Abstract: An exhaust aftertreatment system includes a housing including first and second axial ends. An exhaust inlet is disposed adjacent the first axial end. An exhaust outlet is disposed adjacent the second axial end. A catalytic converter is disposed between the first and second axial ends. A diffuser is disposed inside the housing between the first axial end and the catalytic converter. The diffuser includes a shell in communication with the exhaust inlet. The shell includes proximal and distal portions and a front side facing the catalytic converter. The proximal and distal portions are substantially equal in frontal area. The proximal portion is adjacent the exhaust inlet and includes a first plurality of front side openings totaling a first open area and the distal portion includes a second plurality of front side openings totaling a second open area. The first open area is about 1.8-2.2 times the second.

Abstract: A mixer is disclosed for use in a reductant dosing system. The mixer may have an impingement floor located within an intended fluid injection path and generally parallel with a flow direction through the mixer. The mixer may also have a first side wall connected along a lengthwise edge of the impingement floor, a second side wall connected along an opposing lengthwise edge of the impingement floor, and a plurality of shelves extending between the first and second side walls. The plurality of shelves each may include a plurality of vanes that promote mixing of an injected fluid. One or more of the plurality of shelves may extend different distances upstream opposite the flow direction.

Abstract: A system for uniform flow distribution of a reductant is disclosed. The system includes an injector lance and a diffuser assembly. The injector lance further includes a reductant supply conduit and an injector lance. The reductant supply conduit extends into an internal diameter of an exhaust conduit from a first end of the exhaust conduit towards a second end of the exhaust conduit. The injector lance is in communication with and extends perpendicular to the reductant supply conduit. The injector lance is located along a longitudinal axis of the exhaust conduit. The diffuser assembly is further collocated or integral with the injector lance.

Abstract: A flow mixing device includes a body having a first end, a second end, and an interior volume defined between them. An inlet plate, coupled to the first end of the body, defines at least two inlet orifices in fluid communication with the interior volume. Similarly, an outlet plate, coupled to the second end defines an outlet passage of the flow mixing device. A diffuser conduit, coupled to the inlet plate, defines an inlet passage disposed in fluid communication with the respective inlet orifices. A separator plate assembly disposed in the interior volume extends partially between the first and second ends of the body. Flow guiding vanes, coupled proximal to the second end, extend partially within the diffuser conduit.

Abstract: A mixer is disclosed for use in a reductant dosing system. The mixer may have an impingement floor located within an intended fluid injection path and generally parallel with a flow direction through the mixer. The mixer may also have a first side wall connected along a lengthwise edge of the impingement floor, a second side wall connected along an opposing lengthwise edge of the impingement floor, and a plurality of shelves extending between the first and second side walls. The plurality of shelves each may include a plurality of vanes that promote mixing of an injected fluid. One or more of the plurality of shelves may extend different distances upstream opposite the flow direction.

Abstract: A coolant system for a reductant tank is disclosed. The coolant system includes a valve configured to control a coolant flow to the reductant tank. The coolant system also includes a cyclonic filter element provided in fluid communication with the valve. The cyclonic filter is positioned upstream of the valve with respect to the coolant flow. The cyclonic filter is configured to separate particulate contaminants from the coolant flow to create a filtered coolant flow. The cyclonic filter is also configured to direct the separated particulate contaminants away from the valve. The cyclonic filter is further configured to provide the filtered coolant flow to the valve.

Abstract: An exhaust aftertreatment system, such as for a diesel engine, includes a reductant dosing system with an injector positioned in an elbow pipe of an exhaust conduit. A tubeless mixer is positioned in the exhaust conduit between the injector nozzle outlet and an SCR catalyst. The tubeless mixer includes a plurality of rings, all of which are distributed with increasing size as distance from the nozzle outlet increases. The tubeless mixer aides in more uniformly distributing reductant in the exhaust flow prior to arrival at the SCR catalyst.

Abstract: Accurate measurement of exhaust gas compounds is necessary for correct operation of exhaust treatment systems, such as Selective Catalytic Reduction (SCR) units used in diesel engines. However, accurate sensor readings assume an even distribution of compounds in an exhaust stream in order to use a sampled measurement to be extrapolated to the compound concentrations in the full stream. A structure placed in an exhaust passage downstream of an SCR reaction unit causes turbulence in the exhaust gas while developing a minimal backpressure. This turbulence helps create a more uniform distribution of compounds in the exhaust. As a result, an exhaust gas sensor gives more accurate readings even when the sensor is placed in relatively close proximity to an output of the SCR system.

Abstract: An exhaust aftertreatment system is disclosed. The exhaust aftertreatment system includes a premixer conduit that defines an exhaust flow path, a baffle disposed in the exhaust flow path, and a reductant injector in fluid communication with the exhaust flow path. The baffle is positioned in the premixer conduit, which includes a premixer inlet, a transition section, and a premixer outlet. The transition section is disposed between the premixer inlet and the premixer outlet. The premixer inlet is in fluid communication with the engine. The reductant injector is positioned downstream of the baffle and upstream of the premixer outlet.

Abstract: Accurate measurement of exhaust gas compounds is necessary for correct operation of exhaust treatment systems, such as Selective Catalytic Reduction (SCR) units used in diesel engines. However, accurate sensor readings assume an even distribution of compounds in an exhaust stream in order to use a sampled measurement to be extrapolated to the compound concentrations in the full stream. A structure placed in an exhaust passage downstream of an SCR reaction unit causes turbulence in the exhaust gas while developing a minimal backpressure. This turbulence helps create a more uniform distribution of compounds in the exhaust. As a result, an exhaust gas sensor gives more accurate readings even when the sensor is placed in relatively close proximity to an output of the SCR system.

Abstract: An exhaust system is provided. The exhaust system includes an exhaust conduit having a protuberance thereon. A reductant injector is provided on the protuberance. The reductant injector is positioned such that an ejection tip of the reductant injector is inclined with respect to a centerline of the exhaust conduit. A baffle assembly is coupled to an inner wall of the exhaust conduit. The baffle assembly is positioned upstream of the ejection tip of the reductant injector. A first plate of the baffle assembly is positioned parallel to the centerline of the exhaust conduit. A second plate of the baffle assembly extends from the first plate. The second plate is positioned angularly with respect to the first plate. The baffle assembly is configured to deflect at least a portion of an exhaust gas flow over the ejection tip of the reductant injector.

Abstract: An injector configured to introduce a reductant into an exhaust stream, the injector includes: a body including a conduit with a first diameter, a nozzle fluidly coupled to the conduit and disposed at a distal end of the body, and an extension extending from the distal end of the body, the extension extending from the distal end of the body by at least a distance equal to the first diameter.