Abstract: A catalyst carrier body includes a honeycomb body with at least partly structured sheet metal layers having exhaust gas channels. An inner surface of a jacket tube at least partially encloses, and is connected in at least one axial subregion to, the honeycomb body. A sleeve has a length axially less than the honeycomb body and an outer surface against part of the inner surface of the jacket tube. The sleeve is on an outer region of the honeycomb body near an end surface and has an inner surface connected or brazed to radially outward end regions of the sheet metal layers at the end surface for preventing flapping. The sleeve has at least one microstructure for reducing a contact area between sleeve and jacket tube. Such a catalyst carrier body is mechanically and thermally resistant even to high alternating loads and suitable in particular for placement near the engine.

Abstract: An exhaust system purifies a gas flow of harmful substances. The exhaust system contains at least device for supplying a reducing agent, a first catalytic converter, and a particle trap, in the direction of flow of the gas flow through the exhaust system. At least one other exhaust purification component is provided and/or there is a distance of at least 0.5 meters between the first catalytic converter and the particle trap. In addition, a mixer and a second catalytic converter are positioned directly upstream of the particle trap. A regeneration of the particle trap disposed in the exhaust system is carried out. A reducing agent is introduced into the exhaust gas system, only upstream of the turbocharger, for carrying out the regeneration process of the particle trap.

Abstract: A metallic honeycomb body has an axial length, a partial volume covering at least 55% of the length, a radial dimension of at least 20 mm and inflow and outflow end sides. Sheet-metal layers are structured permitting a fluid, particularly internal combustion engine exhaust gas, to flow through the body between the end sides. The layers each have a surface area, partial regions and end side edges. Each of the layers has a multiplicity of holes formed at least in the partial regions in the partial volume. The holes have a hole surface area of between 1 and 120 mm2. The layer surface area in the partial volume is reduced by 10 to 80%, preferably 35 to 60%, by the holes compared to a layer without holes. The partial volume is spaced from each of the end sides, preventing the holes from touching and cutting through the end side edges. The partial volume amounts, in particular, to more than 60%, preferably more than 90%, of the total honeycomb body volume.

Abstract: A catalyst carrier body has a geometrical longitudinal axis, a honeycomb body and a housing. A corrugated casing with an outer side and an inner side is disposed between the honeycomb body and the housing. The corrugated casing is connected to the housing at attachment sections on the outer side thereof by brazing. The attachment sections lie substantially on a common circumferential line and have the narrowest possible width in direction of a longitudinal axis. The attachment sections have an overall surface area permitting them to securely hold the honeycomb body under operating conditions. A high retention degree for the connection between the honeycomb body and housing can thus be achieved even with a shrinking of the diameter of the honeycomb body at end sides during the service life thereof.

Abstract: 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. The first channel has a closure opposite the entry cross section toward the second end side. Mutually bearing contact surfaces of the channels are joined, creating a wholly metal foil particle filter.

Abstract: Honeycomb bodies, especially those used in an exhaust system of an internal combustion engine, contain a housing and a metal matrix with an average starting diameter. The matrix is connected to the housing, whereby at least one contraction limiter that causes an outward directed tensile stress in at least one part of the matrix is provided. The average starting diameter of the matrix is reduced by 5%, preferably by a maximum of 2%, during and/or after being subjected to thermal stress.

Abstract: A system and a method are provided for determining a pollutant concentration of an exhaust gas at a first position of an exhaust-gas system of an internal combustion engine. A sensor for determining the pollutant concentration is placed at a second position, downstream of the first position, in the exhaust-gas system. The sensor records a measured value, which is then transmitted to a time function element taking into account the time delay between recording a measured value at the first and second positions and transmitting the measured value, temporally correlated with other undelayed measured values, to a diagnosis unit. Sensitive gas sensors can thus be placed at cooler positions of the exhaust-gas system that are less exposed to vibration and can nevertheless determine the pollutant concentration at another position.

Abstract: A process is provided for producing extruded honeycomb bodies with passages, in particular as catalyst carrier bodies for the cleaning of exhaust gas from an internal combustion engine. The passages are bounded by wall regions which are at least partly provided with structures. The honeycomb body is extruded with an extrusion die in such a way that an additional relative movement between the honeycomb body and the extrusion die takes place, leading to a deformation of the wall regions of the passages. An extrusion die for producing extruded honeycomb bodies includes a multiplicity of secured profiled pins and a housing, which together form an extrusion mask. The extrusion mask is variable during the production process, so that wall regions with the structures can be formed. Honeycomb bodies which have structures in the interior that are suitable for influencing a stream of fluid flowing through can therefore be produced in a manner which is simple in terms of production engineering.

Abstract: A honeycomb body configuration includes an intermediate layer for reducing transmission of heat from a honeycomb body to a housing by heat radiation and prevents erosion of ends of the intermediate layer. The intermediate layer has a plurality of layer portions formed from at least one metal sheet and at least one layer of ceramic material. The intermediate layer preferably includes a thermally insulating layer portion, a metal sheet and a swell mat. Ends of the metal sheet cover at least one of the layer portions at the end. The invention is particularly suitable for supporting honeycomb bodies of thin wall ceramic for uses close to the engine in exhaust gas cleaning systems of motor vehicles. It is, however, generally also suitable for the thermal insulation of honeycomb bodies of all kinds with respect to a housing. A sandwich structure, in particular for a honeycomb body configuration, is 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 catalyst assembly includes a housing having at least first and second recesses with side surfaces, and a catalyst carrier body fixed in said housing. The catalyst carrier body has a casing tube and a honeycomb body through which an exhaust gas can flow. The casing tube has at least first and second protuberances with side surfaces and said casing tube is connected to said honeycomb body at least in a partial region. The protuberances extend at least partially into said recesses to form a fixed mounting and at least one floating mounting with an axial mounting play. The assembly ensures that the catalyst carrier body is permanently fixed, in particular during structure-borne vibrations that occur in the exhaust system of an internal combustion engine.

Abstract: A conical honeycomb body and method for producing the honeycomb body that avoids the deformations occurring when fixing a conical lamellar body in a conical casing tube is described. Clamping aids are disposed in the casing tube at a distance from its openings and are configured such that at least in sections they have a ring shape. The clamping aids allow for the economical production of conical honeycomb bodies having greater mechanical strength. Their variants make it possible to influence the function of the edge area of the conical honeycomb body in a targeted manner. Especially beading, necking and/or rings achieve, for example, a barrier effect so that no fluids are able to circulate in the channels situated in the edge area of the casing tube. The openings of the casing tube are free of inserted elements and can therefore be easily welded to other components of the exhaust-gas system.

Abstract: An assembly includes a honeycomb body secured by an inner casing tube in a housing, in particular a housing of an exhaust system of an internal combustion engine. The inner casing tube has an overall length which is bounded axially by two edges and is substantially smaller than the axial length of the honeycomb body. The inner casing tube is also disposed in an approximately axially central position around the honeycomb body and is connected, in particular brazed, thereto in at least one axial connection region. The inner casing tube has a region within the axial connection region in which it is connected to the honeycomb body on the inside or attached directly adjacent the latter on the outside and is connected to the housing. Regions of the inner casing tube which are not connected to the housing but are connected to the honeycomb body toward the inside are constructed as radially elastic spring elements.

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 system and a method are provided for determining a pollutant concentration of an exhaust gas at a first position of an exhaust-gas system of an internal combustion engine. A sensor for determining the pollutant concentration is placed at a second position, downstream of the first position, in the exhaust-gas system. The sensor records a measured value, which is then transmitted to a time function element taking into account the time delay between recording a measured value at the first and second positions and transmitting the measured value, temporally correlated with other undelayed measured values, to a diagnosis unit. Sensitive gas sensors can thus be placed at cooler positions of the exhaust-gas system that are less exposed to vibration and can nevertheless determine the pollutant concentration at another position.

Abstract: A heat-resistant and regeneratable filter body, which can preferably be coated with catalytically active material, for retaining particles from a gas flow flowing through the filter body, has flow paths for the gas flow. The flow paths are separated from each other and at least a first filter stage and a second finer filter stage are disposed in succession in flow direction in the respective flow paths. A process for the production of a heat-resistant and regeneratable filter body for retaining particles, in particular soot particles, from a gas flow flowing through the filter body, preferably from an internal combustion engine, provides predetermined flow paths. In a production procedure for the flow paths in the filter body, at least a first filter stage and a second finer filter stage are disposed simultaneously in a flow path. The first and second filter stages, as viewed in flow direction through the filter body, lie in succession along the flow path.

Abstract: A method and a configuration are provided for monitoring a regeneratable NOx-storage device in an exhaust gas line, in particular of a Diesel or a lean-burn engine, through which an NOx-containing gas flows. A temperature measurement is carried out in the exhaust gas line and the operability, operating condition and/or storage capacity of the NOx-storage device is inferred from the temperature measurement.

Abstract: The method and the novel device clean exhaust gas containing nitrogen oxide from an internal combustion engine. Liquid ammonia is preferably added as reducing agent from a reducing agent reservoir through a reducing agent line and a metering device through the use of open loop or closed loop control synchronously and/or phase-displaced in a relation to the corresponding output of exhaust gas from the combustion chamber and in portions adjusted to the quantities of NOx generated. The synchronized and quantitatively adjusted addition of ammonia allows for NOx and ammonium emissions to be kept low with a catalytic converter disposed downstream and having a small storage volume.

Abstract: A catalyst carrier body includes a honeycomb body with at least partly structured sheet metal layers having exhaust gas channels. An inner surface of a jacket tube at least partially encloses, and is connected in at least one axial subregion to, the honeycomb body. A sleeve has a length axially less than the honeycomb body and an outer surface against part of the inner surface of the jacket tube. The sleeve is on an outer region of the honeycomb body near an end surface and has an inner surface connected or brazed to radially outward end regions of the sheet metal layers at the end surface for preventing flapping. The sleeve has at least one microstructure for reducing a contact area between sleeve and jacket tube. Such a catalyst carrier body is mechanically and thermally resistant even to high alternating loads and suitable in particular for placement near the engine.

Abstract: A catalyst carrier body includes a honeycomb body having sheet-metal layers and an axial extent. The sheet-metal layers are at least partly structured in such a way that the honeycomb body has passages through which an exhaust gas can flow. The sheet-metal layers of the honeycomb body have end regions lying radially outwardly. A tubular jacket has an edge and an axial span shorter than the axial extent of the honeycomb body. The tubular jacket is connected to the honeycomb body in at least one axial partial-region by a joining technique. A sleeve has an axial length shorter than the axial extent of the honeycomb body and is disposed on an outer region of the honeycomb body, in the vicinity of an end surface. The sleeve has an inner shell surface connected by a joining technique to the end regions of the sheet-metal layers at the end surfaces. The honeycomb body projects beyond an edge of the tubular jacket in a projecting section surrounded by the sleeve.