Abstract: An exhaust system for a dual-fuel engine includes an exhaust treatment component in an exhaust passageway. The exhaust treatment component is configured to treat exhaust from the combustion of a second fuel and not from combustion of a first fuel. A thermal enhancement device is in communication with the exhaust passageway and positioned upstream from the exhaust treatment component. A controller activates and deactivates the thermal enhancement device based on switching from the first fuel to the second fuel, wherein the first fuel has a higher sulfur content than the second fuel. The thermal enhancement device increases the temperature of an exhaust to combust a residual amount of the first fuel present in the exhaust passageway during the switch between the first fuel and the second fuel.

Abstract: An after-treatment system including an exhaust treatment component provided in an exhaust passage, a tank carrying an aqueous reagent, and an electrochemical cell in communication with the tank and configured to receive the aqueous reagent therefrom. The electrochemical cell is configured to convert the aqueous reagent into a first exhaust treatment fluid and a second exhaust treatment fluid. A controller is in communication with the electrochemical cell. The controller is configured to vary amounts and/or composition of each of the first exhaust treatment fluid and the second exhaust treatment fluid produced by the electrochemical cell. An injector is in communication with the electrochemical cell and the exhaust passage, and is configured to receive one of the first exhaust treatment fluid or the second exhaust treatment fluid from the electrochemical cell, and dose the one exhaust treatment fluid into the exhaust passage at a location upstream from the exhaust treatment component.

Abstract: An exhaust after-treatment system includes an exhaust treatment component, a tank for holding an exhaust treatment fluid, and an exhaust treatment fluid dosing system. The dosing system includes a fluid distributor providing exhaust treatment fluid under pressure to a plurality of dosing modules that dose exhaust treatment fluid into the exhaust stream and a return for returning unused exhaust treatment fluid to the tank. A valve is positioned between the fluid distributor and the return and is configured to allow a flow of exhaust treatment fluid from the return to the fluid distributor before being returned to the tank during a purge operation. A controller is configured to open the valve and allow communication between the return and the fluid distributor during the purge operation such that unused exhaust treatment fluid drains during the purge operation.

Abstract: An exhaust treatment system includes first and second exhaust conduits positioned on opposite ends of an exhaust treatment device. The exhaust treatment device includes a housing having a first outer diameter at a first end and a different second outer diameter at a second end. A clamp includes an inner surface engaging both the first exhaust conduit and the exhaust treatment device when the exhaust treatment device is positioned with its first end adjacent to the first exhaust conduit. The inner surface of the clamp is spaced apart from one of the housing and the exhaust treatment device when the second end of the exhaust treatment device is adjacent the first exhaust conduit.

Abstract: An exhaust aftertreatment system may include an aftertreatment component and thermoelectric generators. The aftertreatment component is disposed in an exhaust gas passageway. The thermoelectric generators may be disposed in the exhaust gas passageway upstream or downstream of the aftertreatment component. Each of the thermoelectric generators may have a catalytic coating and may include a radially extending fin configured to absorb heat from exhaust gas in the exhaust gas passageway. The fin of at least one of the thermoelectric generators may overlap the fin of at least another one of the thermoelectric generators.

Abstract: An exhaust aftertreatment system may include an aftertreatment component and thermoelectric generators. The aftertreatment component is disposed in an exhaust gas passageway. The thermoelectric generators may be disposed in the exhaust gas passageway upstream or downstream of the aftertreatment component. Each of the thermoelectric generators may have a catalytic coating and may include a radially extending fin configured to absorb heat from exhaust gas in the exhaust gas passageway. The fin of at least one of the thermoelectric generators may overlap the fin of at least another one of the thermoelectric generators.

Abstract: An exhaust aftertreatment system may include an injector, an aftertreatment device and a mixer assembly. The injector may be configured to inject a fluid into an exhaust passageway that receives exhaust gas from a combustion engine. The aftertreatment device may be disposed in the exhaust passageway downstream of the injector. The mixer assembly may be disposed in the exhaust passageway upstream of the aftertreatment device and may include a first stage having a plurality of parallel plates and a second stage connected to the first stage and disposed downstream of the first stage. The second stage may include an auger blade. The mixer assembly may divide an exhaust stream into at least two flow paths.

Abstract: An exhaust aftertreatment system may include a housing, an aftertreatment device, and a cantilevered flow distributing element. The housing receives exhaust gas output from an engine and has a main body and an exhaust gas inlet that is angled relative to the main body. The flow distributing element is disposed within the housing upstream of the exhaust aftertreatment device and includes a baffle plate and a collar. The baffle plate is attached to an inner wall of the main body. The collar may include a plurality of first apertures, a downstream axial edge and an upstream axial edge. A portion of the downstream axial edge may abut an upstream-facing surface of the baffle plate. The baffle plate may have a plurality of second apertures extending through the upstream-facing surface. The collar may extend across and partially block at least some of the second apertures.

Abstract: An exhaust aftertreatment system may include an injector, an aftertreatment device and a mixer assembly. The injector may be configured to inject a fluid into an exhaust passageway that receives exhaust gas from a combustion engine. The aftertreatment device may be disposed in the exhaust passageway downstream of the injector. The mixer assembly may be disposed in the exhaust passageway upstream of the aftertreatment device and may include a first stage having a plurality of parallel plates and a second stage connected to the first stage and disposed downstream of the first stage. The second stage may include an auger blade. The mixer assembly may divide an exhaust stream into at least two flow paths.

Abstract: An after-treatment system for treating exhaust gas discharged from a combustion engine, the after-treatment system comprising an exhaust after-treatment component including an exhaust after-treatment substrate, the exhaust after-treatment substrate including an inlet face including a first zone having a first catalyst located at a center of the inlet face, and a second zone having a second catalyst located radially outward from the center of the inlet face, wherein an amount of the exhaust gas that travels through the first zone is greater than an amount of the exhaust gas that passes through the second zone, and a catalyst loading of the first catalyst in the first zone is less than a catalyst loading of the second catalyst in the second zone.

Abstract: An after-treatment system for treating exhaust gas discharged from a combustion engine, the after-treatment system comprising an exhaust after-treatment component including an exhaust after-treatment substrate, the exhaust after-treatment substrate including an inlet face including a first zone having a first catalyst located at a center of the inlet face, and a second zone having a second catalyst located radially outward from the center of the inlet face, wherein an amount of the exhaust gas that travels through the first zone is greater than an amount of the exhaust gas that passes through the second zone, and a catalyst loading of the first catalyst in the first zone is less than a catalyst loading of the second catalyst in the second zone.

Abstract: An engine exhaust after-treatment system including an exhaust passage including a plurality of legs, with an exhaust control valve being positioned at an inlet of each of the legs that is configured to control an amount of exhaust that enters each leg. A desulfurization treatment component is located within each of the legs. An alkaline reagent tank provides an alkaline reagent to the desulfurization treatment component, and a reagent control valve is disposed between the alkaline reagent tank and the desulfurization treatment component. The reagent control valve is configured to control an amount of alkaline reagent that enters the desulfurization component. A controller may be communication with each of the exhaust control valves and reagent control valves, wherein the controller is configured to control the exhaust control valves independently of the reagent control valves.

Abstract: An exhaust treatment component for treating an exhaust produced by an engine. The exhaust treatment component includes a housing, a first exhaust treatment component substrate positioned within the housing, and a dosing module for dosing a reagent exhaust treatment fluid into the exhaust. The dosing module is secured to the housing and positioned upstream of the first exhaust treatment component substrate. An ultrasonic transducer is positioned between the dosing module and the first exhaust treatment component substrate. The ultrasonic transducer is configured to emit a plurality of ultrasonic waves into the exhaust including the reagent exhaust treatment fluid.

Abstract: An exhaust after-treatment system includes an exhaust inlet, an exhaust outlet, and an array of exhaust treatment components disposed in a housing. The housing includes a first connection flange securing the housing to the inlet, a second connection flange securing the housing to the outlet, and a third flange positioned between the first and second flanges. A mounting device is secured to the third flange to independently support the housing relative to the inlet and the outlet.

Abstract: An exhaust after-treatment system includes an exhaust treatment component, a tank for holding an exhaust treatment fluid, and an exhaust treatment fluid dosing system. The dosing system includes a fluid distributor providing exhaust treatment fluid under pressure to a plurality of dosing modules that dose exhaust treatment fluid into the exhaust stream and a return for returning unused exhaust treatment fluid to the tank. A valve is positioned between the fluid distributor and the return and is configured to allow a flow of exhaust treatment fluid from the return to the fluid distributor before being returned to the tank during a purge operation. A controller is configured to open the valve and allow communication between the return and the fluid distributor during the purge operation such that unused exhaust treatment fluid drains during the purge operation.

Abstract: An exhaust after-treatment system including at least one exhaust treatment component (18); and a particulate matter dispersion device (40) located upstream of the exhaust treatment component (18). The particulate matter dispersion device (40) includes at least one nozzle line (61) having a plurality of nozzles (58) formed therein, and the particulate matter dispersion device (40) is operable to inject compressed gas towards the exhaust treatment component (18) to substantially minimize build-up of particulate matter at the exhaust treatment component (18).

Abstract: An exhaust system including a selective catalytic reduction (SCR) component and an oxidation catalyst component. The exhaust system also includes an exhaust treatment fluid injection system for dispersing an exhaust treatment fluid into an exhaust stream at a location adjacent either the SCR component or the oxidation catalyst component, wherein the exhaust treatment fluid injection device includes a common rail that provides the exhaust treatment fluid under pressure to a plurality of injectors that dose the exhaust treatment fluid into the exhaust stream. The exhaust treatment fluid injection device also includes a return rail for returning unused exhaust treatment fluid to the fluid source. Each of the common rail and return rail can be configured to allow drainage of the exhaust treatment fluid as a freeze-protection feature.

Abstract: An exhaust treatment system includes first and second exhaust conduits positioned on opposite ends of an exhaust treatment device. The exhaust treatment device includes a housing having a first outer diameter at a first end and a different second outer diameter at a second end. A clamp includes an inner surface engaging both the first exhaust conduit and the exhaust treatment device when the exhaust treatment device is positioned with its first end adjacent to the first exhaust conduit. The inner surface of the clamp is spaced apart from one of the housing and the exhaust treatment device when the second end of the exhaust treatment device is adjacent the first exhaust conduit.

Abstract: An aftertreatment system may treat exhaust gas discharged from an engine. The system may include first and second selective-catalytic-reduction (SCR) catalysts and a valve. The valve may be disposed upstream of the first SCR catalyst and at least one of an oxidation catalyst and a particulate filter. The valve is connected to first and second exhaust flow paths and is movable between a first position allowing exhaust gas to flow through the first flow path and bypass the second flow path and a second position allowing exhaust gas to flow through the second flow path and bypass the first flow path. The second SCR catalyst may be a low-temperature SCR catalyst and may be disposed in the second flow path. A control module may cause the valve to move between the first and second positions based on a temperature of the exhaust gas and/or a temperature of the engine.

Abstract: An exhaust treatment system includes an exhaust treatment device having a stepped outer diameter. First and second clamps each include a stepped inner diameter such that the clamps engage the exhaust treatment device and other portions of the exhaust treatment system when the exhaust treatment device is properly oriented. The exhaust treatment device interferes with one of the clamps to preclude coupling the exhaust treatment device to an adjacent portion of the exhaust treatment system when an attempt is made to install the exhaust treatment device in a reversed improper orientation. A consistent exhaust flow direction through an exhaust treatment device such as a diesel particulate filter may be maintained through use of the inventive system.