Cummins Emission Solutions Inc.

Cummins Inc.

Niklas M Schmidt

Z Gerald Liu

Achuth Munnannur

Apoorv Kalyankar

Mihai Chiruta

Changsheng C Su

Nathan A Ottinger

Roy W Detra

George L Muntean

Stephen M Holl

John K Heichelbech

Andrew Morgan Myer

James C Clerc

John Anthis

A Carl McDonald, Jr

Chetan Ponnathpur

Joydeep Dipak Chakrabarti

James F Burke

Yujun Wang

Yogesh Vasantrao Birari

Ramakrishna Gopal Dontha

David Lee Dunnuck

Brandon Simmons

Yuanzhou Xi

Rebecca A Veele

Achuth Mannannur

An exhaust gas aftertreatment system includes an introduction gas conduit, a dosing module, a mixer, and an outlet flange. The introduction conduit is centered on a conduit center axis. The dosing module is coupled to the introduction conduit and includes an injector. The injector is configured to provide a treatment fluid into the introduction conduit and is defined by an injection axis. The mixer is disposed within the introduction conduit and includes a mixer body. The mixer body is configured to receive exhaust gas and the treatment fluid. The outlet flange includes an outlet flange body, an outlet flange opening, and a plurality of outlet flange perforations. The outlet flange body is centered on an outlet flange center axis. The outlet flange body includes an outlet flange body inner portion and an outlet flange body outer portion. The outlet flange body inner portion is coupled to the mixer body.

Exhaust gas aftertreatment system

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.

Systems and methods for mixing exhaust gases and reductant in an aftertreatment system

Apparatus and method for mixing reductant in an exhaust gas flow using virtual interception. Embodiments include an exhaust gas and reductant mixer comprising a body, a first flow device, and a reductant entry port. The body defines an exhaust gas flow path having a central portion. The first flow device swirls the exhaust gas in a circumferential direction with respect to the gas flow path. The reductant entry port introduces the reductant into the gas flow path at a location downstream from the first flow device and in an introduction direction (1) offset from the central portion, and (2) opposite the circumferential direction.

Exhaust gas and reductant mixer for an aftertreatment system

An exhaust aftertreatment system for increasing fractional efficiency of diesel or gasoline particulate filters includes a particulate filter that includes a housing and a filter substrate positioned in the housing. The filter substrate is pre-conditioned with an aqueous solution or suspension configured to decompose or evaporate in response to exposure to heat so as to precondition the filter substrate.

Method and apparatus to enhance fractional efficiency of diesel and gasoline particulate filters

A liquid reductant injector nozzle includes a first portion defining a hollow cylindrical static chamber, in fluid communication with second portion defining a hollow frustoconical converging section, which is in turn in fluid communication with a sharp edged type discharge orifice. The hollow cylindrical static chamber is in reductant receiving communication with a reductant source, and has a first and second circular opening having equal diameters. The second circular opening is downstream of the first circular opening. The hollow frustoconical converging section is in reductant receiving communication with the hollow cylindrical static chamber via the second circular opening. Reductant received from the reductant source is discharged through the discharge orifice. A sidewall of the hollow cylindrical static chamber and a frustum side of the frustoconical converging section define an angle of convergence of the liquid reductant injector nozzle relative to a plane of the second circular opening.

Converging liquid reductant injector nozzle in selective catalytic reduction systems

A vane swirl mixer for exhaust aftertreatment includes: a vane swirl mixer inlet; a vane swirl mixer outlet; a first flow device including: a Venturi body; a plurality of upstream vanes positioned within the Venturi body; a plurality of upstream vane apertures interspaced between the plurality of upstream vanes; a plurality of downstream vanes positioned within the Venturi body; and a plurality of downstream vane apertures interspaced between the plurality of downstream vanes. At least one of the upstream vane hub and the downstream vane hub is radially offset from a Venturi center axis, thereby causing individual ones of the plurality of vanes coupled to the radially offset vane hub to differ in their geometry.

A method for increasing a catalytic efficiency of a catalyst, comprising providing a catalyst. Finally, the catalyst is installed into a selective catalytic reduction system of an aftertreatment system configured to reduce constituents of an exhaust gas generated by an engine. The catalyst is soaked in a liquid which consists essentially of one of water or a water-comprising solution. The soaking occurs at least one of before or after installing the catalyst in the selective catalytic reduction system. The catalyst can include a copper zeolite catalyst.

Systems and methods for enhancing catalytic efficiency of SCR catalysts

Apparatuses and methods for urea dosing of an exhaust after treatment system are disclosed. Exemplary apparatuses include a chamber configured to receive pressurized gas at a first inlet, receive urea solution at a second inlet and provide a combined flow of pressurized gas and urea to an outlet, flow passage extending from the first inlet to a seating surface, and a valve member configured to move between an open position in which the valve member is spaced apart from the seating surface and a closed position in which the valve member contacts the seating surface. As the valve member moves from the open position to the closed position, the valve member contacts the seating surface at a first location and wipes an area of the seating surface extending from the first location in a direction toward the flow passage.

Urea injection systems valves

Apparatuses and methods for urea dosing of an exhaust after treatment system are disclosed. Exemplary apparatuses include a chamber configured to receive pressurized gas at a first inlet, receive urea solution at a second inlet, and provide a combined flow of pressurized gas and urea to an outlet, a flow passage extending from the first inlet to a seating surface, and a valve member configured to move between an open position in which the valve member is spaced apart from the seating surface and a closed position in which the valve member contacts the seating surface. As the valve member moves from the open position to the closed position the valve member contacts the seating surface at a first location and wipes an area of the seating surface extending from the first location in a direction toward the flow passage.

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Madison, WI, United States of America

Niklas M Schmidt