Abstract: In a method for operating an exhaust gas after-treatment system for an internal combustion engine, the exhaust gas after-treatment system comprises at least one apparatus for generating a plasma and at least one SCR catalyst. The exhaust gas after-treatment system further comprises a device for metering a reactant for the SCR catalyst. According to the invention, the nitrogen oxides resulting from the operation of the apparatus for generating a plasma are taken into account in the method when metering the reactant for the SCR catalyst.

Abstract: A device for measuring the quality of an operating substance and/or additive, in particular a reduction agent, stored in a tank, includes a reference container connected to the operating substance and/or the additive via a semi-permeable diaphragm, in which the reference container is filled with a medium which has a known osmotic pressure relative to the used operating substance and/or additive.

Abstract: In a method for operating an exhaust gas after-treatment system for an internal combustion engine, the exhaust gas after-treatment system comprises at least one apparatus for generating a plasma and at least one SCR catalyst. The exhaust gas after-treatment system further comprises a device for metering a reactant for the SCR catalyst. According to the invention, the nitrogen oxides resulting from the operation of the apparatus for generating a plasma are taken into account in the method when metering the reactant for the SCR catalyst.

Abstract: A method for operating an exhaust system of an internal combustion engine, wherein nitrogen oxide (NOx) is reduced by use of a SCR catalytic converter and wherein the ageing state of the SCR catalytic converter is monitored, characterized in that during a temporally limited phase having a high proportion of nitrogen oxide (NOx) in the exhaust gas, a conversion of said SCR catalytic converter is acquired and evaluated and the ageing state of said SCR catalytic converter is suggested therefrom.

Abstract: A device for measuring the quality of an operating substance and/or additive, in particular a reduction agent, stored in a tank, includes a reference container connected to the operating substance and/or the additive via a semi-permeable diaphragm, in which the reference container is filled with a medium which has a known osmotic pressure relative to the used operating substance and/or additive.

Abstract: A procedure for controlling an exhaust gas purification system of a combustion engine, consisting of one or several catalytic converters for converting and/or storing at least one exhaust gas component of an exhaust gas of the combustion engine at least one of the catalytic converters is construed as oxidization catalytic converter. With the aid of the adsorption capability of at least partially uncombusted hydrocarbons of one of the catalytic converters a diagnosing forecast about the NO oxidization of the catalytic converters is derived, whereby the at least partially uncombusted hydrocarbons are introduced into the exhaust gas duct at least partially in front of the catalytic converter. With the procedure and the device for implementing the procedure the NO oxidization capability of the involved catalytic converters can be evaluated in the range of extended on-board diagnosis requirements to provide “feed-gas” for subsequent exhaust gas after-treatment systems.

Abstract: The invention relates to a catalyst arrangement in an exhaust gas after-treatment system of an internal combustion engine comprising an exhaust gas line in which an SCR catalyst is positioned in the direction of flow of the exhaust gas. A reducing agent production system has an NOx and CO/H2 production unit and a combined NOx storage/ammonia production unit in the standard gas-carrying path of the reducing agent production system which supplies ammonia as the reducing agent. The NOx and CO/H2 production unit is at least temporarily supplied via a fuel supply and an air supply with starting products for producing ammonia. The combined NOx storage/ammonia production unit has a plurality catalyst sections having different characteristic properties or functionalities, enabling a higher ammonia yield in the combined NOx storage/ammonia production unit.

Abstract: A method for operating an exhaust system of an internal combustion engine, wherein nitrogen oxide (NOx) is reduced by use of a SCR catalytic converter and wherein the ageing state of the SCR catalytic converter is monitored, characterized in that during a temporally limited phase having a high proportion of nitrogen oxide (NOx) in the exhaust gas, a conversion of said SCR catalytic converter is acquired and evaluated and the ageing state of said SCR catalytic converter is suggested therefrom.

Abstract: A method of and apparatus for controlling the reducing agent in an exhaust gas aftertreatment system of an internal combustion engine with an exhaust gas duct in which an SCR catalyst is provided in the direction of flow of the exhaust gas. A reducing agent-generating system (RGS) comprising an NOx and CO/H2 production unit as well as a combined NOx storage/ammonia production unit in the standard gas path of the reducing agent-generating system. Ammonia is delivered upstream from the SCR catalyst to reduce nitrogen oxides, starting materials for producing the ammonia being fed at least in part to the NOx and CO/H2 production unit via a fuel inlet and an air inlet. An AGC matrix of the combined NOx storage/ammonia production unit is cooled at least intermittently by means of an inner and/or outer cooling device.

Abstract: A procedure for controlling an exhaust gas purification system of a combustion engine, consisting of one or several catalytic converters for converting and/or storing at least one exhaust gas component of an exhaust gas of the combustion engine at least one of the catalytic converters is construed as oxidization catalytic converter. With the aid of the adsorption capability of at least partially uncombusted hydrocarbons of one of the catalytic converters a diagnosing forecast about the NO oxidization of the catalytic converters is derived, whereby the at least partially uncombusted hydrocarbons are introduced into the exhaust gas duct at least partially in front of the catalytic converter. With the procedure and the device for implementing the procedure the NO oxidization capability of the involved catalytic converters can be evaluated in the range of extended on-board diagnosis requirements to provide “feed-gas” for subsequent exhaust gas after-treatment systems.

Abstract: Methods of reducing agent control in an exhaust gas aftertreatment system of a combustion engine with an exhaust gas pipe in which in the direction of flow of the exhaust gas there is an SCR catalyzer. A reducing agent generating system has an NOx and CO/H2 generating unit, an oxidation catalyzer, and a combined NOx storage/ammonia generating unit in the standard gas path of the reducing agent generating system. Ammonia is introduced as a reducing agent for the reduction of nitric oxides before the SCR catalyzer of the reducing agent generating system. Precursor materials for generation of ammonia are directed at least temporarily to the NOx and CO/H2 generating unit through a fuel feed and an air feed. A CO/H2 reducing agent stream is temporally modulated during a rich phase. A CO/H2 concentration is primarily held constant at a high level.

Abstract: The invention relates to a procedure for controlling the reducing agent in an exhaust gas post-processing system of a combustion machine with an exhaust gas duct, in which an SCR catalytic converter is provided in the direction of flow of the exhaust, wherein a reducing agent generation system has an NOx and CO/H2 generation unit,, an oxidation catalytic converter and a combined NOx storage / ammonia generation unit in the standard gas route of the reducing agent generation system, and, in order to reduce nitrogen oxide, ammonia is added as a reducing agent in front of the SCR catalytic converter by the reducing agent generation system, wherein source materials for the generation of ammonia are at least intermittently added to the NOx and CO/H2 generation unit via a fuel supply line and via an air supply line, wherein during the fat phase the air/fuel composition is changed in front of the oxidation catalytic converter in the form of a lambda modulation for a lambda value.

Abstract: A method of and apparatus for controlling the reducing agent in an exhaust gas aftertreatment system of an internal combustion engine with an exhaust gas duct in which an SCR catalyst is provided in the direction of flow of the exhaust gas. A reducing agent-generating system (RGS) comprising an NOx and CO/H2 production unit as well as a combined NOx storage/ammonia production unit in the standard gas path of the reducing agent-generating system. Ammonia is delivered upstream from the SCR catalyst to reduce nitrogen oxides, starting materials for producing the ammonia being fed at least in part to the NOx and CO/H2 production unit via a fuel inlet and an air inlet. An AGC matrix of the combined NOx storage/ammonia production unit is cooled at least intermittently by means of an inner and/or outer cooling device.

Abstract: The invention relates to a catalyst arrangement in an exhaust gas after-treatment system of an internal combustion engine comprising an exhaust gas line in which an SCR catalyst is positioned in the direction of flow of the exhaust gas. A reducing agent production system has an NOx and CO/H2 production unit and a combined NOx storage/ammonia production unit in the standard gas-carrying path of the reducing agent production system which supplies ammonia as the reducing agent. The NOx and CO/H2 production unit is at least temporarily supplied via a fuel supply and an air supply with starting products for producing ammonia. The combined NOx storage/ammonia production unit has a plurality catalyst sections having different characteristic properties or functionalities, enabling a higher ammonia yield in the combined NOx storage/ammonia production unit.

Abstract: The invention relates to a procedure for controlling the reducing agent in an exhaust gas post-processing system of a combustion machine with an exhaust gas duct, in which an SCR catalytic converter is provided in the direction of flow of the exhaust, wherein a reducing agent generation system has an NOx and CO/H2 generation unit,, an oxidation catalytic converter and a combined NOx storage / ammonia generation unit in the standard gas route of the reducing agent generation system, and, in order to reduce nitrogen oxide, ammonia is added as a reducing agent in front of the SCR catalytic converter by the reducing agent generation system, wherein source materials for the generation of ammonia are at least intermittently added to the NOx and CO/H2 generation unit via a fuel supply line and via an air supply line, wherein during the fat phase the air/fuel composition is changed in front of the oxidation catalytic converter in the form of a lambda modulation for a lambda value.

Abstract: The invention concerns a process for reducing agent control in an exhaust gas aftertreatment system of a combustion engine with an exhaust gas pipe in which in the direction of flow of the exhaust gas there is an SCR catalyzer, whereby a reducing agent generating system has an NOx and CO/H2 generating unit, an oxidation catalyzer, and a combined NOx storage/ammonia generating unit in the standard gas path of the reducing agent generating system, and ammonia is introduced as a reducing agent for the reduction of nitric oxides before the SCR catalyzer of the reducing agent generating system, whereby precursor materials for generation of ammonia are directed at least temporarily to the NOx and CO/H2 generating unit through a fuel feed and an air feed, whereby a CO/H2 reducing agent stream is temporally modulated during a rich phase with ?<1 serving as a reducing phase for the NOx storage/ammonia generating unit, whereby a CO/H2 concentration is primarily held constant at a high level (>30%).

Abstract: A method and a device for supplying a fuel, in particular for operating combustion engines in motor vehicles, turbines or the like, the fuel being split at a separation means into a first fuel fraction in the form of a retentate and into a second fuel fraction in the form of a permeate. On the permeate side, the separation means is acted upon by a scavenging gas, so that a mixture of the fuel permeate and the scavenging gas is produced.