Abstract: An exhaust aftertreatment system, including injection of chemical species, has a mixer in the exhaust pipe between the injector and the aftertreatment element. The mixer is provided by a stamped muffler flange.

Abstract: An acoustic silencer is provided by a tubular member extending along an axis and having a hollow interior defining an axial flow path therethrough. The tubular member has a sidewall with an interior face facing the hollow interior and having quarter wave resonators formed by blind holes therein.

Abstract: An air filtration cartridge has annular filter media having a hollow interior and extending axially between first and second distally opposite end caps. The first end cap is an outlet end cap having flow straightening structure integrally formed therewith and spanning the hollow interior. The second end cap is a closed end cap having an interior face having quarter wave resonators formed by blind holes therein.

Abstract: Gas treatment systems are described that allow for modular development of gas treatment systems, for example exhaust gas aftertreatment systems, using generally standardized parts. A number of subsections are provided, including a treatment subsection containing an exhaust gas treatment device for treating exhaust gas. The treatment subsection is designed to be connectable to an inlet subsection, an outlet subsection, or other subsections in a manner that allows the positions, both longitudinally and rotationally, of the treatment subsection relative to adjacent subsections to be adjusted as required during assembly. This permits an infinite number of length and/or clocking configurations for the aftertreatment system to be manufactured.

Abstract: An engine intake resonator and manufacturing method is provided by a pair of molded sheets mated to each other along a plane and defining a plurality of tubular channels therebetween and having different length for attenuation of different frequencies.

Abstract: An exhaust aftertreatment device (10) includes an aftertreatment element (24) for treating internal combustion engine exhaust, an injector (26) for injecting chemical species mixing with the exhaust prior to reaching the aftertreatment element, and a turbulator (36) turbulating the exhaust to enhance the noted mixing. In a desired combination, a two-stage integrated perforated tube combination structure includes a turbulent mixing tube (38) disposed in an acoustic tube (40) and concentrically surrounded thereby.

Abstract: An exhaust aftertreatment device has a diffuser upstream of an aftertreatment element such as a catalyst element or a filter element such as a diesel particulate filter. The diffuser de-focuses centralized velocity force flow against the aftertreatment element from the inlet in a space efficient and flow efficient construction.

Abstract: An exhaust aftertreatment device has a diffuser upstream of an aftertreatment element such as a catalyst element or a filter element such as a diesel particulate filter. The diffuser de-focuses centralized velocity force flow against the aftertreatment element from the inlet in a space efficient and flow efficient construction.

Abstract: A diesel particulate collector (10) based on the principles of inertial impaction, virtual impaction, and filtration, for controlling exhaust emissions (12) from a diesel internal combustion engine (14) includes a housing (16) having a first plate (24) with a plurality of nozzles (26) directing exhaust flow therethrough, a first impactor (28) causing particle separation and a change of flow direction, a second plate (30) having a second set of nozzles (32) directing exhaust flow therethrough, and a second impactor (34) causing particle separation and a change of flow direction, in a first of multiple stages in a sequential cascaded separation and collection system.

Abstract: An exhaust aftertreatment device (10) includes an aftertreatment element (24) for treating internal combustion engine exhaust, an injector (26) for injecting chemical species mixing with the exhaust prior to reaching the aftertreatment element, and a turbulator (36) turbulating the exhaust to enhance the noted mixing. In a desired combination, a two-stage integrated perforated tube combination structure includes a turbulent mixing tube (38) disposed in an acoustic tube (40) and concentrically surrounded thereby.

Abstract: An exhaust aftertreatment filter is provided with localized and efficient heating for regeneration. Electrical and/or thermal conductors are wound with filter media sheets into a filter roll and/or conductors are provided at axial ends of the filter roll and/or microwave radiation is used for localized hot zone heating. Regeneration is provided at lateral slices of the filter roll lying in a plane extending transversely and radially relative to the filter roll axis.

Abstract: A diesel particulate collector (10) based on the principles of inertial impaction, virtual impaction, and filtration, for controlling exhaust emissions (12) from a diesel internal combustion engine (14) includes a housing (16) having a first plate (24) with a plurality of nozzles (26) directing exhaust flow therethrough, a first impactor (28) causing particle separation and a change of flow direction, a second plate (30) having a second set of nozzles (32) directing exhaust flow therethrough, and a second impactor (34) causing particle separation and a change of flow direction, in a first of multiple stages in a sequential cascaded separation and collection system.

Abstract: An exhaust aftertreatment filter is provided with localized and efficient heating for regeneration. Electrical and/or thermal conductors are wound with filter media sheets into a filter roll and/or conductors are provided at axial ends of the filter roll and/or microwave radiation is used for localized hot zone heating. Regeneration is provided at lateral slices of the filter roll lying in a plane extending transversely and radially relative to the filter roll axis.

Abstract: An acoustic resonator (20) has a resonator cavity (22) with a resonator port (24) for communicating with an exhaust flow passage (26) conducting acoustic waves therethrough. Adjustable port structure varies acoustic impedance of the port by various combinations including translation to vary area along an arcuate surface, translation between discrete areas, translation to cumulatively open port area, multiple translation, multiple ports, rotational area change, and rotational length change. Adaptive control may be provided. A combined passive and active acoustic system may also be provided.

Abstract: An active silencer for a vehicle exhaust system that is constructed so that it can be hung underneath the vehicle without altering the vehicle. The silencer has a chamber isolated from the exhaust flow. A duct spans longitudinally through the chamber. One or more loudspeakers (e.g. 2 or 4 loudspeakers) are mounted on the duct side-by-side. The loudspeakers share a common tuning volume within the duct which is ported to a mixing apparatus where the canceling acoustic wave mixes with noise from the exhaust flow before the exhaust noise exits to the atmosphere.

Abstract: An active silencer for a vehicle exhaust system that has a low profile so that it can be hung underneath the vehicle in a conventional manner without altering the vehicle. The silencer has a chamber isolated from the exhaust flow in which one or more speakers are mounted side-by-side. The speakers face downwards and share a common tuning chamber within the isolated chamber. The tuning chamber is ported to a mixing chamber where the canceling acoustic waves mix with noise from the exhaust flow before the exhaust noise exits to the atmosphere.