Abstract: A honeycomb body includes sheet metal layers forming a central current path to a radial connecting pin. A metal casing has an inner periphery and a feedthrough guiding and insulating the pin. The layers are alternate coarsely structured and finely structured or smooth sheets forming a stack with uppermost and lowermost layers forming axial gas channels. The pin is metallically connected to two or all of the layers directly or through an intermediate piece by an electrically conductive or welded connection. The current path has an electrical resistance per unit length in the connection region being greater than an average electrical resistance per unit length in the stack. The uppermost layer runs approximately parallel to the casing over 35% or 40% of the inner periphery and is separated from the casing by an air gap. Simple manufacture of a highly uniform, reliably operating, electrically heatable honeycomb body is thus possible.

Abstract: A delivery unit for a liquid additive includes a first pump with a first suction port and a first pressure port, a second pump with a second suction port and a second pressure port, and a feed device. The feed device is connected to the first pressure port through a first line system and the first suction port is connected to a tank for the liquid additive through a second line system. The second pressure port is connected to the tank through a third line system and the second line system and the third line system are separated from one another. A method for operating a delivery unit and a motor vehicle having a delivery unit are also provided.

Abstract: A delivery unit for a liquid additive includes a block having at least three ducts, at least one active component mounted on the block for delivering the liquid additive, a cylindrical collecting chamber into which the at least three ducts open, and a deformable, sleeve-shaped element disposed in the collecting chamber. A motor vehicle having a delivery unit is also provided.

Abstract: A delivery device for delivering liquid reducing agent includes a reducing agent tank. At least a delivery unit, at least one first compensation element, a reducing agent line and a metering unit together have an overall volume to be filled with a reducing agent and are configured for delivering, conducting and metering the reducing agent from the reducing agent tank. The at least one first compensation element is configured for reducing the overall volume when a negative pressure occurs in the delivery device. A method for compensating freezing of a reducing agent in a delivery device and a motor vehicle having a delivery device, are also provided.

Abstract: A method for feeding reducing agent or reducing agent precursor into exhaust systems of mobile internal combustion engines and an exhaust system are preferably used for internal combustion engines with high nitrogen oxide compound emissions. A feed time is established. An exhaust parameter and/or necessary quantity of reducing agent is determined and a feed state of the reducing agent is defined. The reducing agent is treated if the feed state does not correspond to a stored state. The reducing agent feed to the exhaust system takes place last. The steps are repeated multiple times. This permits reducing agent to be fed into an exhaust system in a state suitable for the exhaust temperature, so that complete conversion of reducing agent takes place and selectively catalytic reduction is also ensured. This reduces the quantity of electrical energy necessary for converting reducing agent. A motor vehicle having the system is also provided.

Abstract: A delivery device for delivering reducing agent into an exhaust-gas treatment device includes at least one delivery duct with at least one flexible wall region. The flexible wall region can deform when reducing agent in the delivery duct freezes. The flexible wall region separates the delivery duct from a compressed-air chamber which is connected to a compressed-air source. Methods for operating and deactivating a delivery device and a motor vehicle having a delivery device are also provided.

Abstract: A method for operating an exhaust gas treatment device including an electric heater for heating an exhaust gas flow in the exhaust gas treatment device and/or a surface in the exhaust gas treatment device and a feed point for feeding an additive into the exhaust gas treatment device to impinge upon the electric heater, includes supplying additives to the feed point, determining an operational state of the exhaust gas treatment device, in which deposits can impinge upon the electric heater, using at least one state variable, determining a cycle frequency in dependence on the operating state when the operating state lies in a predetermined operating state range, and cyclically activating and deactivating the electric heater using the determined cycle frequency when the determined operating state lies in the predetermined operating state range. A motor vehicle having the exhaust-gas treatment device is also provided.

Abstract: A semiconductor element includes at least a thermoelectric material and a first frame part which are force-lockingly connected to one another, with the frame part forming a diffusion barrier for the thermoelectric material and an electrical conductor. A method for producing the semiconductor element as well as a thermoelectric module having at least two semiconductor elements, are also provided.

Abstract: An injection device for injecting a fluid into an exhaust-gas treatment device includes an injector positioned in an injector holder. The injector has a supply opening and a component of the injector holder extends into the supply opening. The injection device is suitable, in particular, for supplying a urea/water solution into an exhaust-gas treatment device of a motor vehicle. The component is preferably rigid in the longitudinal direction and can be compressed in the radial direction by way of a deformable rubber shell, in order to compensate for the volumetric expansion of the solution if it freezes. A motor vehicle having the injection device is also provided.

Abstract: A device for storing or supplying an operating fluid includes a tank with an interior space and a protrusion which protrudes into the interior space and has a circumferential surface. At least one electrode for determining a filling level is disposed radially, running around the circumferential surface. Methods for mounting such a device and for monitoring a reserve filling level as well as a motor vehicle are also provided.

Abstract: A thermoelectric module includes a cold side, a hot side and thermoelectric elements disposed between the two sides. At least one heat conducting layer is disposed between the thermoelectric elements and at least the cold side or the hot side and the heat conducting layer can be compressed. A method for producing a thermoelectric module having at least one heat conducting layer is also provided.

Abstract: A method for operating a dosing unit for dosing reducing agent into an exhaust gas treatment device for purifying the exhaust gases of an internal combustion engine, includes providing the dosing unit with at least one delivery pump, at least one injector and a line section for conducting reducing agent from the delivery pump to the injector. The dosing unit is first operated for dosing reducing agent into the exhaust gas treatment device. Then, the dosing unit is shut off. Subsequently, a first pressure is maintained in the line section for at least a first time period, with the first pressure exceeding atmospheric pressure. A motor vehicle having the dosing unit is also provided.

Abstract: An exhaust-gas treatment unit includes a housing with a first end and an oppositely disposed second end, a tube extending from the first end to the second end and serving as an inflow region for an exhaust gas, a deflecting region in the vicinity of the second end for the exhaust gas, and a return flow region extending between the tube and the housing. In the deflecting region, the exhaust gas is mixed and transferred into the return flow region. A method for mixing an exhaust gas in an exhaust-gas treatment unit and a vehicle having the exhaust-gas treatment unit and carrying out the method, are also provided.

Abstract: A thermoelectric module includes an inner circumferential surface, an axis and an outer circumferential surface. A plurality of semiconductor elements is disposed with thermoelectric material in the direction of the axis and between the inner circumferential surface and the outer circumferential surface and are electrically interconnected in an alternating manner. At least one part of the semiconductor elements has at least one inner frame part or an outer frame part. At least some of the inner frame parts form an interrupted inner circumferential surface or outer frame parts form an interrupted outer circumferential surface.

Abstract: A supporting pin for supporting an electrically heatable honeycomb body on a first honeycomb body includes a first end region, a second end region, an intermediate region, a core made of electrically non-conductive ceramic material and a metalized surface on at least one end region. The intermediate region is electrically non-conductive and has a length of at least 3 mm, preferably 5 to 15 mm. The supporting pin is particularly suitable for stabilizing electrically heatable honeycomb bodies in exhaust gas treatment systems for internal combustion engines, particularly for motor vehicles. When higher electrical voltages, such as 48 V, are used for electrically heatable honeycomb bodies, good electrical isolation is also assured in exhaust gas systems carrying soot particles with simultaneous safe support and suppression of vibrations.

Abstract: A thermoelectric module includes an interrupted inner circumferential surface, an axis and an outer circumferential surface. A plurality of semiconductor elements having thermoelectric material are disposed in direction of the axis and between the inner circumferential surface and the outer circumferential surface and are electrically alternately connected to each other. At least some of the semiconductor elements include at least one inner frame part or an outer frame part and at least the inner frame parts form the interrupted inner circumferential surface. The inner circumferential surface also forms a cold side of the thermoelectric module and a dimensionally unstable sheath is provided at least at the interrupted inner circumferential surface. A vehicle having a plurality of thermoelectric modules is also provided.

Abstract: A device having a heat exchanger includes a housing having an inlet and an outlet for a fluid and an inner tube having a first end face extending in axial direction, an opposite second end face and a circumferential surface having openings. A plurality of heat exchanger tubes is disposed parallel to the axial direction on the outside of the circumferential surface. The housing encloses the heat exchanger tubes and the inner tube and the inlet is fluidically connected to the first end face. Guide elements are disposed between the heat exchanger tubes so that the fluid entering the inner tube through the first end face flows out across the heat exchanger tubes in radial direction starting from the inner tube. The device is used particularly for constructing a thermoelectric generator for positioning in the underbody of a motor vehicle. A motor vehicle having the device is also provided.

Abstract: A device for the aftertreatment of an exhaust gas of an internal combustion engine flowing through an exhaust line includes at least one dosing unit disposed in an opening of an exhaust pipe of the exhaust line and configured to add an exhaust-gas aftertreatment agent into the exhaust line. The dosing unit is enclosed by a cooling jacket, through which the dosing unit is fastened in the opening of the exhaust pipe. The cooling jacket is at least partially enclosed by a space or chamber delimited at least by the cooling jacket, the exhaust pipe, and a cover plate. The cover plate is connected to the exhaust pipe and spaced apart from the cooling jacket or the dosing unit by a gap. A motor vehicle having the device is also provided.

Abstract: A device for providing liquid reducing agent includes a tank with an interior space and a vessel disposed at least partially in the interior space of the tank. The vessel is at least partially surrounded on the outside by a filter having a filter surface and a filter depth. A delivery unit disposed in the vessel is configured to deliver reducing agent from the tank, through the filter and to an extraction point for reducing agent. A motor vehicle having the device is also provided.

Abstract: A metering unit for a reducing agent includes an injector for supplying the reducing agent to an exhaust gas treatment device. A temperature sensor is disposed at the injector. A method for metering reducing agent and a motor vehicle having a metering unit are also provided.