Abstract: A honeycomb body includes a housing and a plurality of layers with a curved profile and a predetermined length. Each layer includes at least one at least partially structured metal foil forming a multiplicity of passages with a passage cross section. A majority of the layers have different lengths than one another. A process for producing a honeycomb body, a process for treating exhaust gas, and an exhaust gas assembly, are also provided.

Abstract: A method for providing ammonia (NH3) in an exhaust gas flow of an internal combustion engine includes generating nitrogen monoxide (NO) with a plasma generator, reversibly storing at least a portion of the nitrogen monoxide (NO), reducing at least a portion of the stored and/or generated nitrogen monoxide (NO) to form ammonia (NH3) in a first gas flow, and mixing the first gas flow with the exhaust gas flow. The method and a device for reducing nitrogen oxides advantageously increase the efficiency of an on-board plasma-assisted generation of ammonia, particularly for mobile applications, such as in motor vehicles, and reduces the consumption of fuel required therefor, in comparison to prior art devices and methods.

Abstract: A process for producing a fleece having metallic wire filaments, includes at least the following steps: a) forming a layer including wire filaments; b) producing first cohesive connections between at least some of the metallic wire filaments in a first joining process; and c) producing second cohesive connections between metallic wire filaments in a second joining process. A process for producing a honeycomb body having at least one fleece, a fleece, a honeycomb body, an apparatus and a vehicle using fleeces in the treatment of exhaust gas from motor vehicles, are also provided.

Abstract: A honeycomb body includes an inlet end side and an outlet end side. Metal sheets are wound, intertwined and/or layered into a multiplicity of sheet metal layers being at least partially structured to form channels leading from the inlet end side to the outlet end side. Edges of at least some of the sheet metal layers have cutouts formed therein at the inlet end side and/or the outlet end side, resulting in a fissured structure of the inlet end side and/or the outlet end side. As a result, only the smooth metal sheets or only the structured metal sheets or both can be provided with the cutouts. Additionally, at least some of the metal sheets can be made of a porous material, in particular compressed metal fibers. Deposition of soot particles on the end sides of the honeycomb body is, to a large extent, prevented due to the cutouts.

Abstract: A housing for an exhaust gas purification component encloses an interior space in which at least one receptacle is formed by the housing at the outside. An exhaust system includes at least one first exhaust line section and the housing having the exhaust gas purification component. The first exhaust line section is in engagement with the receptacle, and the first exhaust line section and the receptacle are connected to one another in a materially integral manner. A motor vehicle having the exhaust system is also provided.

Abstract: A housing for an exhaust gas treatment component includes a casing having a first thickness and a first length and at least one sleeve having a second thickness and a second length. The at least one sleeve is at least partially in contact with the outside of the casing and is connected thereto. The second length of the at least one sleeve is shorter than the first length of the casing. An exhaust gas treatment component, an exhaust gas system and a motor vehicle are also provided.

Abstract: A method for adding at least one, in particular liquid, reactant, to an exhaust gas stream of an internal combustion engine includes adding a reactant flow to the stream downstream of an element provided for an at least partial conversion and/or at least partial elimination of at least one component of the stream, so that at least part of the reactant flow impinges on the element. This achieves rapid evaporation of the reactant flow. Impinging on the element, which is hot during operation, i.e. at temperatures of 400° C. and more, causes rapid evaporation and, because of a preferably porous coating of the element, take-up of the reactant solution into the element with successive evaporation. Urea, in particular, can be evaporated quickly, effectively and virtually completely upon introduction into an exhaust system as a reducing agent for selective catalytic reduction of nitrogen oxides, in particular in a downstream SCR catalytic converter.

Abstract: An apparatus for treating exhaust gases from a mobile internal combustion engine includes at least an exhaust pipe with a direction of extent, a honeycomb body having at least ceramic or extruded material, and at least one metallic fiber mat, which is at least partially disposed between the exhaust pipe and the honeycomb body. At least two zones with different functions are formed in the direction of extent by the at least one fiber mat. At least one first zone serves a function of mounting the honeycomb body, and at least one other zone serves a function selected from the group consisting of thermal insulation and forming a seal against gas. A vehicle having the apparatus is also provided.

Abstract: An exhaust gas system for an internal combustion engine includes an intake system and an exhaust outlet interconnected by an exhaust gas recirculation line having an exhaust treatment unit and a heat exchanger. The heat exchanger has a first back pressure and the exhaust treatment unit has a second back pressure, smaller than the first back pressure. The exhaust treatment unit is disposed at such a first distance from the heat exchanger in flow direction that, during operation, a gas flow entering the exhaust treatment unit is homogenized. The exhaust gas system permits an advantageous configuration of a heat exchanger and an exhaust treatment unit, such as for example a honeycomb body in the exhaust gas recirculation line, in which both the heat exchanger and the exhaust treatment unit can have a smaller structure than in conventional systems. This reduces costs considerably for equipping such a system.

Abstract: A method positions a sensor in a honeycomb body which is provided with hollow spaces that can be penetrated at least in part by an exhaust gas. The sensor is placed in an area of the honeycomb body in which at least one minimum hydrogen concentration occurs when the honeycomb body is operated in the emission system of a motor vehicle. The sensor positioning method allows the sensor to be placed in the honeycomb body in such a way that systematic errors that occur are kept as small as possible as a result of an inherent transverse sensitivity of the sensor to hydrogen. This applies especially to lambda probes. A honeycomb body contains the sensor which is placed so as to supply particularly reliable test data whose systematic error is as small as possible.

Abstract: An exhaust gas system for an internal combustion engine includes a first exhaust treatment unit with a first back pressure and a second exhaust treatment unit with a second back pressure being higher than the first back pressure. The system advantageously enables the configuration of systems having two exhaust treatment units that are disposed one behind the other in flow direction. The first and/or second exhaust treatment unit can have a smaller construction due to the homogenization of flow. This applies, for example, when an oxidation-type catalytic converter is provided as the first exhaust treatment unit and when a particulate filter is provided as the second exhaust treatment unit. The homogenization of flow in the first exhaust treatment unit increases the conversion rate so that the first and/or second exhaust treatment unit can be provided with a smaller construction. This saves considerable costs when configuring such systems.

Abstract: A honeycomb structure includes a plurality of substantially parallel channels, a layer of at least partially structured metal foils and a housing. The layer includes a number N of at least partially structured metal foils and a number N+1 of smooth metal foils. The number N=1, 2 or 3 and two of the smooth metal foils are exterior foils. A method for producing such a honeycomb structure is also provided. The honeycomb structure is used, in particular in exhaust gas systems of mobile internal combustion engines.

Abstract: An exhaust gas filter for cleaning an exhaust gas of an internal combustion engine includes at least one strip-shaped filter layer made of a material through which a fluid can at least partly flow. The filter layer has a length in a longitudinal direction and a width in a transverse direction. The filter layer has a metallic reinforcing region at least in a partial region. The metallic reinforcing region has a width and a length. The width of the reinforcing region is less than the width of the filter layer and/or the length of the reinforcing region is less than the length of the filter layer. A method for producing a filter layer for an exhaust gas filter is also provided.

Abstract: A system for cleaning exhaust gases of mobile internal combustion engines, particularly diesel engines, includes at least one open particulate filter having a freedom of flow of at least 20% and at least one heating element. The aim is to ensure, even at a position located far from the internal combustion engine, a continuous regeneration of the open particulate filter, which is distinguished by its low pressure loss and by its high degree of efficiency.

Abstract: A method for gluing and brazing a honeycomb structure includes at least one partially structured foil with a pitch and a wave height. The method includes the steps of choosing a mean brazing material diameter of a powder brazing material, said diameter being 15% smaller than the height of the wave; determining a minimum thickness of the glue strip according to equation; gluing at least partially structured foil within the width of the glue strip on at least part of the wave crests formed by the undulation; brazing the honeycomb structure. The invention also relates to a corresponding honeycomb structure that ensures satisfactory joint connections even when said structure is used in the exhaust systems of automobiles.

Abstract: A honeycomb body for an exhaust system of an internal combustion engine has an axial length and channels which are substantially separated from each other and through which an exhaust gas can flow. The honeycomb body includes at least one first and one second subset of channels. At least the cross-sectional areas of one of the subsets of channels differs along the axial length of the honeycomb body, so that a transient time of the exhaust gas in the different subsets of channels is different. The difference in transient time of the exhaust gas between the different subsets of channels can be used for damping sound waves having one or more wavelengths, so that noise is reduced in the exhaust system in order to purify the exhaust gas without needing additional components in the exhaust system. An exhaust system and a method for muffling sound therein are also provided.

Abstract: Within the framework of the purification of exhaust gases of mobile internal combustion engines, filter materials are subjected to particularly high thermal and dynamic conditions. As a result, it is advantageous to use filter materials together in a stable and durable composite. To this end, a heat-resistant filter layer made of a material through which a fluid can at least partially flow and which has at least one filter section and at least one edge area, is provided. A layer thickness that differs from that of the at least one filter section is provided in the at least one edge area.

Abstract: A metal foil connection of first and second metal foils having a thickness of less than 0.05 mm includes a connecting point in which the metal foils are brazed to one another. The connecting point forms a wedge which is filled with brazing medium. A mass of the brazing medium, and a mass of sections of the metal foils which the brazing medium contacts in the wedge, have a given ratio. A honeycomb body, a brazing medium particle fraction and a method for manufacturing metal foil connections with a thickness of less than 50 micrometers, are also provided.

Abstract: A particle filter of metal foil has walls defining fluid flow channels with inlets and outlets. A first channel has an open entry cross section at a first end side extended partway into the first channel. A second channel has an open exit cross section substantially corresponding to the entry cross section. One of the walls of the first channel has filter passage perforations leading to the second channel. A closure in the first channel, opposite the entry cross section, toward a second end side, closes off the first channel to the fluid. A process for producing a particle filter from metal foil includes pulling the metal foil from an endless storage device. A joining element or strip is applied to the metal foil. The metal foil is shaped into subsequent channels. The metal foil is wound or stacked to form first and second channels in opposite directions. The first channel has an open entry cross section at the first end side extending partway into the first channel.

Abstract: A method and an apparatus produce a connection of at least at one end surface of a carrier matrix of a honeycomb body, in particular a catalyst carrier body, by a joining technique. The matrix is disposed in a tubular jacket and is laminated and/or wound from at least partially structured sheet metal foils or layers. The end surface of the honeycomb body is at least partially heated up with the aid of a surface inductor having induction coils. The induction coils are disposed in such a way that interconnections of the sheet metal foils or layers are established at least at locations, in particular at spots. Such connecting spots are preferably established variably with regard to their extent over the end surface. The surface inductor is variable with regard to the production of connecting locations and/or connecting spots, that is with regard to effective regions.