Abstract: A system for NOx reduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO2, particulate filter, a source of reductant such as NH3 and an SCR catalyst and methods for operating such a system are disclosed. Considerable improvements in NOx conversion and soot reduction are observed even at relatively low operating temperatures.

Abstract: The invention relates to a reducing agent metering system, and to a method for controlling the injection of a reducing agent into the exhaust gas flow (9) of a turbocharged internal combustion engine for selective catalytic reduction, wherein the metering system can be connected to a reducing agent tank (1), from which reducing agent can be removed, wherein the metering system comprises at least one nozzle (5) through which the reducing agent can be injected by means of compressed air into the exhaust gas flow (9), wherein at least one part of the compressed air is taken from a charger of the internal combustion engine, wherein the compressed air supply (6) comprises an electric air pump (7) for generating compressed air, and comprises a bypass (19) in parallel with the air pump (7), so that the charge air of the turbocharger flows over or can flow over the air pump (7).

Abstract: The invention relates to a metering system for injecting a urea solution into the exhaust gas flow (9) of an internal combustion engine for selective catalytic reduction, and method for controlling the injecting of a urea solution by means of compressed air, wherein the metering system can be connected to a urea solution tank (1), wherefrom urea solution can be removed, and wherein the metering system can be connected to a compressed air supply (6), wherein the metering system comprises at least one nozzle (5) through which the urea solution can be injected into the exhaust gas flow (9) by means of compressed air, wherein the metering system comprises an air valve (7) by means of which the pressure and/or the quantity of air and/or the valve opening times of the compressed air supply (6) can be regulated, and a sensor for measuring the pressure and/or the quantity of air is disposed in the compressed air supply (6) between the air valve (7) and the nozzle (5), so that the quantity of compressed air fed in for

Abstract: A system for NOx reduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO2, particulate filter, a source of reductant such as NH3 and an SCR catalyst and methods for operating such a system are disclosed. Considerable improvements in NOx conversion and soot reduction are observed even at relatively low operating temperatures.

Abstract: A system for NOx reduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO2, particulate filter, a source of reductant such as NH3 and an SCR catalyst and methods for operating such a system are disclosed. Considerable improvements in NOx conversion and soot reduction are observed even at relatively low operating temperatures.

Abstract: A metering system for injecting a urea solution into the exhaust gas flow of an internal combustion engine for selective catalytic reduction, and method for controlling the injecting of a urea solution by means of compressed air, wherein the metering system is connected to a urea solution tank and a compressed air supply, wherein the metering system comprises at least one nozzle through which the urea solution can be injected into the exhaust gas flow by compressed air, including an electronic control unit and air valve for regulating the pressure and/or the quantity of air and/or the valve opening times of the compressed air supply and a sensor for measuring the pressure and/or the quantity of air disposed in the compressed air supply between the air valve and the nozzle so that the quantity of compressed air fed in for atomizing the urea solution is controlled.

Abstract: The invention relates to a reducing agent metering system, and to a method for controlling the injection of a reducing agent into the exhaust gas flow (9) of a turbocharged internal combustion engine for selective catalytic reduction, wherein the metering system can be connected to a reducing agent tank (1), from which reducing agent can be removed, wherein the metering system comprises at least one nozzle (5) through which the reducing agent can be injected by means of compressed air into the exhaust gas flow (9), wherein at least one part of the compressed air is taken from a charger of the internal combustion engine, wherein the compressed air supply (6) comprises an electric air pump (7) for generating compressed air, and comprises a bypass (19) in parallel with the air pump (7), so that the charge air of the turbocharger flows over or can flow over the air pump (7).

Abstract: The invention relates to a metering system for injecting a urea solution into the exhaust gas flow (9) of an internal combustion engine for selective catalytic reduction, and method for controlling the injecting of a urea solution by means of compressed air, wherein the metering system can be connected to a urea solution tank (1), wherefrom urea solution can be removed, and wherein the metering system can be connected to a compressed air supply (6), wherein the metering system comprises at least one nozzle (5) through which the urea solution can be injected into the exhaust gas flow (9) by means of compressed air, wherein the metering system comprises an air valve (7) by means of which the pressure and/or the quantity of air and/or the valve opening times of the compressed air supply (6) can be regulated, and a sensor for measuring the pressure and/or the quantity of air is disposed in the compressed air supply (6) between the air valve (7) and the nozzle (5), so that the quantity of compressed air fed in for

Abstract: The invention relates to an exhaust gas after treatment apparatus having a hollow cylindrical casing shell (2). In the inside an exhaust catalytic converter, preferably adapted as SCR-catalytic converter, as well as an inflow chamber (9) for exhaust gas to be purified are provided. Therein, the inflow chamber (9) is defined by two bottom portions (10, 11) arranged opposite to each other. Further, a shell portion (12) gas tightly encompassing the bottom portions (10, 11) is provided for the inflow chamber (9). The inflow chamber (9) is encompassed by the casing shell (2) and may be manufactured from a material different from a material of the casing shell. The exhaust gas after treatment apparatus (1) is suitable in particular for commercial motor vehicles having a diesel engine.

Abstract: In a filter body for a particle filter with a filter part, comprised of a gas-permeable support material coated with a sintered metal powder, and with a connection part connected with the filter part and provided for welding together with a holding element, the filter part and the connection part together form a closed volume and the connection part is comprised of a gas-impermeable material.

Abstract: Exhaust gas aftertreatment system, especially for a diesel engine. The invention proposes an exhaust gas aftertreatment system having an exhaust gas particulate filter (3), a nitrogen oxide reduction catalytic converter (7, 8) connected downstream of the exhaust gas particulate filter, and an apparatus (17) for adding reducing agent. As claimed in the invention, the exhaust gas particulate filter (3) is designed as a porous cylindrical filter body having a substantially radial exhaust gas inflow direction into the filter body, a filter inner region (26) for filtered exhaust gas, and an axial exhaust gas outflow direction out of the filter inner region (26), and reducing agent is added into the filter inner region (26) via the apparatus (17) for adding reducing agent. Use in motor vehicles, in particular in commercial vehicles.

Abstract: A device for exhaust-gas purification utilizes reduction of nitrogen oxides which are present in the exhaust gas from internal combustion engines by way of gaseous ammonia with an SCR catalytic converter. The functions of the device are monitored with regard to their line paths with connections, valves and sensors by referring to these elements themselves using suitable control circuitry via the evaluation and control unit.

Abstract: A filter assembly for an exhaust gas purification system of an internal combustion engine. The filter assembly, has porous filter plate elements, connected with each other on their outer as well as on their inner peripheries, forming in pairs as filter pockets. Catalytic agents such as ammonia are applied to the filter pockets on the outer and/or inner sides to oxidize carbon black contained in the combustion gas. In particular, this filter assembly is compact and can be used for diesel engines of motor vehicles.

Abstract: In an operating method for internal combustion engines which operate with exhaust-gas aftertreatment systems, in particular diesel internal combustion engines, a plurality of operating programs are used. The first of these programs, as an initial stage, works on the basis of automatic regeneration. The second of these programs provides measures which assist regeneration, for example by increasing the exhaust-gas temperature, in the event of conditions which are unfavourable for regeneration, for example on account of unfavourable driving cycles. The third of these programs has the purpose of reactivating the damaged components in the event of non-irreversible damage to the components of the exhaust-gas system.

Abstract: A reducing agent dosing device for delivering a reducing agent into the exhaust gas system 8 of the internal combustion engine 2 of a motor vehicle, comprising a reducing agent tank 3 connected to the exhaust gas system 8 via a supply line 5, 7 with a dosing valve 6 for delivering a specific quantity of reducing agent. The dosing valve 6 is disposed at a distance from the exhaust gas system 8 in the supply line 5, 7 and the output of the dosing valve 6 terminates in a mixing chamber 7. Compressed air, provided by the charge air of a charging group 10 of the internal combustion engine 2, flows though the mixing chamber in the direction toward the exhaust gas system 8 to mix the reducing agent output with an air stream.

Abstract: In a filter pocket for a particle filter with a pocket part, comprised of a gas-permeable support material coated with a sintered metal powder, and with a connection part connected with the pocket part and provided for welding together with a holding element, the pocket part and the connection part together form a closed volume and the connection part is comprised of a gas-impermeable material.

Abstract: A diesel particle filter for lowering the emission of particles contained in the exhaust gas of a Diesel engine, is disclosed with the impaction surface of the diesel particle filter is developed such that binding forces of the ash to filter is lowered. Therefore, the adhesion of noncombustible ash particles occurs, if at all, on the impaction surface of the diesel particle filter at only with such binding forces that more the ash particles can be removed from this surface of the diesel particle filter with a fluid and/or by vibrational effects.

Abstract: A reducing agent dosing device for delivering a reducing agent into the exhaust gas system of the internal combustion engine of a motor vehicle is disclosed. The internal combustion engine has fuel carried along in a fuel tank with a fuel return line disposed between the internal combustion engine and the fuel tank. The reducing agent dosing device has a reducing agent tank connected to exhaust gas system of the internal combustion engine by a supply line. The supply line for is disposed such that it is in heat-conducting connection with the fuel return line of the internal combustion engine to heat the reducing agent carried in the supply line.

Abstract: An exhaust gas purification system for denoxing exhaust gases of a combustion unit on an SCR catalyst 2 utilizing ammonia (NH3) additionally introduced into the exhaust gas flow before the SCR catalyst 2, which has at least one reducing agent container 4, in which the NH3 (5) to be supplied to the exhaust gas flow is stored, which container 4 is connected via a supply line 7 with the exhaust gas line 1, and is adapted so that at least one reducing agent container 4 is held in a docking device 15 as a portion of the exhaust gas purification system 3 and, via a coupling 20, 21, is connected with the supply line 7. Of coupling 20, 22 one coupling part 22 is associated with the docking device 15 and the other coupling part 20 with the container 4, so that both coupling parts 20, 22 can be engaged with one another via an axial movement directed toward one another.

Abstract: In an operating method for internal combustion engines which operate with exhaust-gas aftertreatment systems, in particular diesel internal combustion engines, a plurality of operating programs are used. The first of these programs, as an initial stage, works on the basis of automatic regeneration. The second of these programs provides measures which assist regeneration, for example by increasing the exhaust-gas temperature, in the event of conditions which are unfavourable for regeneration, for example on account of unfavourable driving cycles. The third of these programs has the purpose of reactivating the damaged components in the event of non-irreversible damage to the components of the exhaust-gas system.