Abstract: An over-the-road vehicle including an engine unit and an engine-integrated exhaust treatment system is disclosed. The engine-integrated exhaust treatment system can selectively reduce nitrous oxides (NOx) in exhaust gases from the engine unit. The engine-integrated exhaust treatment system includes a reagent doser integrated into the engine unit and a catalyst in fluid communication with the engine unit. The reagent doser injects aqueous urea solution into at least one cylinder of the engine unit without fuel while fuel is injected into at least one other cylinder of the engine unit for combustion. The aqueous urea solution is converted in the cylinder to ammonia gas that is mixed with exhaust gases from the other cylinders. This mixture is then exposed to the catalyst to encourage reduction of NOx in the exhaust gases before they are discharged to atmosphere.

Abstract: An automotive exhaust aftertreatment system for reducing effluents, such as nitrous oxides (NOx), in exhaust gasses passing through the system. The automotive exhaust aftertreatment system includes a dosing unit configured to inject primary and secondary reductant fluids into exhaust gasses based on various strategies to optimize operation of the system.

Abstract: An exhaust system includes a first exhaust after-treatment system receiving exhaust gases generated by an engine, a second exhaust after-treatment system downstream of the first exhaust after-treatment system, and at least one bypass connecting an engine outlet to an inlet to the second exhaust after-treatment system. A turbocharger is associated with the bypass and a bypass valve is located upstream of the turbocharger. The bypass valve is moveable between an open position to bypass exhaust gas flow to the first exhaust after-treatment system, a closed position to direct all exhaust gas flow to the first exhaust after-treatment system, and a partially open position where one portion of exhaust gas flow is directed into the first exhaust after-treatment system and a remaining portion of exhaust gas flow is directed into the turbocharger. A controller controls movement of the bypass valve between the open, closed, and partially open positions.

Abstract: A vehicle exhaust system includes a first exhaust after-treatment module that receives engine exhaust gases and a second exhaust after-treatment module that is downstream of the first exhaust after-treatment module. A valve is moveable between an open position that blocks flow to the first exhaust after-treatment module such that all exhaust gas flow bypasses the first exhaust after-treatment module and is directed into the second exhaust after-treatment module, a closed position that directs flow into the first exhaust after-treatment module before the flow enters the second exhaust after-treatment module, and a partially open position where one portion of flow is directed into the first exhaust after-treatment module and a remaining portion of flow is directed into the second exhaust after-treatment module. A controller controls movement of the valve between the open, closed, and partially open positions based on at least one of engine flow rate and NOx output.

Abstract: A mixer for a vehicle exhaust system includes an outer housing that defines an internal cavity, an inlet pipe that directs exhaust gas into the internal cavity, and an outlet baffle. The outer housing includes a doser opening configured to receive a doser. The outlet baffle directs a mixture of the exhaust gas and a reducing agent injected by the doser into a downstream exhaust component. A deflector deflects exhaust gas exiting the inlet pipe to mix with the reducing agent prior to entering the downstream exhaust component.

Abstract: An exhaust component assembly includes a component housing defined by an outer dimension and having at least one sensor opening. A sensor boss surrounds the at least one sensor opening and at least one exhaust component is positioned radially outwardly of the component housing and includes an opening that surrounds the at least one sensor opening. A first flange extends about an outer periphery of the sensor boss and a second flange is associated with the opening of the at least one exhaust component to accommodate variations in the outer dimension such that the first and the second flanges can be attached to each other.

Abstract: An automotive vehicle includes an exhaust aftertreatment system. The exhaust aftertreatment system includes a mixer, a doser that injects a reducing agent into the mixer, and a selective catalytic reduction unit. The exhaust aftertreatment system mixes exhaust gases and the reducing agent for treatment prior to the exhaust gases being discharged into the atmosphere. Some components of the exhaust aftertreatment system are positioned proximate to an associated combustion engine to minimize thermal energy loss from the exhaust gases prior to interaction with the exhaust aftertreatment system.

Abstract: A mixer for a vehicle exhaust system includes an outer housing defining an exhaust gas flow path, wherein the outer housing includes an inlet opening and an outlet opening. A distribution pipe is configured to deliver a reduction fluid directly into the exhaust gas flow path. The distribution pipe has an inlet end associated with the inlet opening and an outlet end associated with the outlet opening. The distribution pipe comprises a fluid flow path that is coiled about a center of the exhaust gas flow path.

Abstract: A vehicle exhaust system includes a mixer housing that has a doser opening and defines an internal mixing chamber. A doser injects fluid into the mixer housing through the doser opening. A flow passage has an inlet end positioned adjacent the doser opening and an outlet end open to the mixing chamber. At least one heating device associated with the flow passage.

Abstract: A joining device for producing an exhaust gas system for an internal combustion engine comprises a device base, a frame, and at least two joining units that can be operated simultaneously are fastened to the frame. The frame extends essentially vertically starting from the device base. In a method for producing the exhaust gas system, at least one joining unit of a joining device is oriented to a geometry of the exhaust gas system that is to be produced, at least three components or assemblies of the exhaust gas system are positioned in the joining device, and the components or assemblies are simultaneously connected.

Abstract: An automotive exhaust aftertreatment system includes an onboard ammonium carbamate reactor. The onboard ammonium carbamate reactor is coupled to a diesel emission fluid reservoir also included in the system and is configured to generate aqueous ammonium carbamate solution from diesel emission fluid. A doser configured to inject the generated aqueous ammonium carbamate solution has integrated heating.

Abstract: A valve actuating device, in particular for an exhaust system, comprises a disk assembly, an actuating arm, and a valve actuator wherein the disk assembly is arranged between the actuating arm and the valve actuator. The disk assembly, at least in part, thermally decouples the actuating arm from the valve actuator and includes at least two identically constructed disks with axial protrusions, which in an axial direction are directly arranged one behind the other and contact each other at the protrusions.

Abstract: An exhaust component includes a housing defining an internal cavity and a burner positioned within the internal cavity. The burner provides a combustion chamber having an exhaust gas inlet, a fuel inlet, a combustion air inlet, and an outlet. At least one exhaust aftertreatment component is positioned within the internal cavity and is directly coupled to the outlet of the combustion chamber.

Abstract: An electrically heated catalyst has a catalyst body and a housing at least circumferentially surrounding the catalyst body. An electrical contacting assembly is arranged on a shell surface of the catalyst body, the electrical contacting assembly comprising a surface electrode arranged directly on the catalyst body and a contacting element connected to the surface electrode. The contacting element is rigid and has a screw thread.

Abstract: An exhaust component includes a housing defining an internal cavity, at least one exhaust aftertreatment component positioned within the internal cavity, and a heat exchanger. The housing has an inlet configured to receive engine exhaust gases and an outlet configured to direct the engine exhaust gasses into a tailpipe. A reductant source is associated with the housing and produces ammonia to mix with engine exhaust gases entering the exhaust aftertreatment component. The heat exchanger is positioned within the internal cavity to reduce a temperature of the engine exhaust gases exiting the outlet.

Abstract: An automotive exhaust aftertreatment system includes an onboard ammonium carbamate reactor. The onboard ammonium carbamate reactor is coupled to a diesel emission fluid reservoir also included in the system and is configured to generate aqueous ammonium carbamate solution from diesel emission fluid. A hybrid heating system for use with the ammonium carbamate reactor is provided in this disclosure.

Abstract: An adaptive valve assembly includes a pipe defining a passageway for conducting engine exhaust gases, a pivot shaft supported by the pipe, and a valve body coupled to the pivot shaft. The valve body is moveable between an open position where exhaust gas flow through the passageway is increased and a closed position where exhaust gas flow through the passageway is reduced. A spring biases the valve body toward the closed position. The spring includes a plurality of coils that have torsional displacement relative to each other as the valve body moves between the open and closed positions. A torsional damper feature is associated with at least one coil of the plurality of coils to provide torsional spring damping.

Abstract: An exhaust component assembly includes a housing having at least one mount area configured to be attached to another exhaust component. A primary heat shield is attached to the housing and includes at least one open area at the mount area. A secondary heat shield positioned adjacent to the primary heat shield to at least partially cover the mount area. A method of assembling the primary and secondary heat shields to the housing of the exhaust component assembly is also disclosed.

Abstract: A vehicle exhaust system component includes an exhaust tube defining an exhaust gas flow path, a side branch tuning tube connected to the exhaust tube at an interface, and a porous structure associated with the exhaust tube to reduce noise generated at the interface. In one example, the porous structure comprises a perforated orifice in the exhaust tube. In another example, the porous structure comprises a mesh screen or mesh sleeve.

Abstract: A method of manufacturing a cylindrical housing of an exhaust-gas treatment unit for vehicles includes providing a flat sheet metal part having at least one embossing, and round bending the sheet-metal part in a round bending tool by displacing the sheet metal part between rolls such that the sheet metal part obtains a cylindrical shape having a longitudinal direction parallel to roll axes of the rolls. At least one elastic roll is used such that the embossing of the sheet metal part is maintained during round bending. The longitudinal edges of the cylindrical sheet metal part are then connected to form a tube. A method of manufacturing an exhaust-gas treatment unit is furthermore shown.