Robert Boschgmbh

Atotech Deutschland Gmbh

Norbert Breuer

Heinrich Meyer

Ralf Schmidt

Joachim Berger

Detlef Heimann

Rainer Strohmaier

Bernhard Kamp

Markus Widenmeyer

Markus Gloeckle

Peter Riegger

Andreas Genssle

Thorsten Raatz

Ralf Wegst

Christian Schiller

Frank Ilgner

Stefan Woerz

Markus Hernier

Ralf Wirth

Stefan Fischer

Karl-Franz Reinhart

Thomas Hauber

Walter Bauer

Bernard Kamp

Franz-Josef Trompeter

Martin Bohnet

Buenyamin Duru

Kai-Achim Baldenhofer

Thomas Grau

Katharina Körting

Reinhard Pfendtner

Christelle Oediger

Kai Baldenhofer

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. Cooling results in the longest possible section of the running length (L) and thus the largest possible volume percent of the AGX matrix within the combined NOx storage/ammonia production unit having an optimum temperature range regarding the highest possible ammonia yield, which overall contributes to a great ammonia production rate.

Method and apparatus for temperature management in an exhaust gas posttreatment system

Devices and methods for the production of ammonia as a reducing agent for the selective catalytic reduction (SCR) of nitrogen oxides in the exhaust gas of a combustion source, especially of an internal combustion engine. The ammonia is admixed with the exhaust gas in the direction of flow in front of a SCR-catalytic converter. In so doing, nitrogen oxide is produced in a nitrogen oxide production unit separated from the combustion source and its exhaust gas duct and is stored in at least one storage catalytic converter or a nitrogen oxide storage and a subsequently connected catalytic converter. Furthermore, hydrogen and/or a hydrogen-carbon monoxide-mixture is produced in a hydrogen production unit separated from the combustion source and its exhaust gas duct and delivered to a storage catalytic converter. Hydrogen and the stored nitrogen oxide are converted catalytically to ammonia in the storage catalytic converter or in the catalytic converter.

Device and procedure for the production of ammonia

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 NOand CO/Hgeneration unit,, an oxidation catalytic converter and a combined NOstorage / 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 NOand CO/Hgeneration 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. It can thus be achieved that, in pulse mode, a high H/CO yield can be achieved with a simultaneously low HC slip and the higher HC penetrations associated with the natural aging of the catalytic converter and the decreasing H/CO yields are compensated. Influences resulting from the reactor geometry of the oxidation catalytic converter can be influences or compensated with the procedure in terms of its drive-away characteristic.

Procedure for controlling the reducing agent in an exhaust gas post-processing system

A sensor for detecting particles in a gas flow, in particular soot particles in an exhaust gas flow, includes at least two measuring electrodes, which are positioned on a substrate made of an insulating material. To protect the measuring electrodes, they are covered by a protective layer.

Sensor for detecting particles

A method for metering ammonia into the exhaust-gas region of an internal combustion engine and a device for implementing the method. The ammonia storage capacity of an SCR catalytic converter situated in the exhaust-gas region of the internal combustion engine is utilized. After the internal combustion engine has been switched off, ammonia is introduced into the exhaust-gas region in front of the SCR catalytic converter. Thus, following a renewed start-up of the internal combustion engine, the ammonia required in the SCR catalytic converter for reducing the nitrogen oxides contained in the exhaust gas of the internal combustion engine are already available before an ammonia source is ready for operation. The procedure eliminates the need for a pressure storage of ammonia in the switched-off state of the internal combustion engine.

Method for metering ammonia into the exhaust-gas region of an internal combustion engine and device for implementing the method

A device for ascertaining a particle concentration in an exhaust gas flow of a combustion device, particularly a diesel combustion device, is provided, which device ascertains very small particle concentrations in the exhaust gas of combustion devices, accompanied by high time resolution. At least one measuring unit is provided for measuring a concentration of an oxidizing agent in the exhaust gas flow, having at least one measuring element sensitive to the oxidizing agent.

Device for ascertaining a particle concentration in an exhaust gas flow

A combustion system is for generating energy by the combustion of a fuel, using a combustion device, such as, for example, a gasoline or diesel engine. An emission control system is provided for converting exhaust gas components using an automotive fluid, by the use of which energy, that is relatively environmentally protective and made available for varied applications. At least one hydrogen generating unit is provided for converting the automotive fluid at least partially into an hydrogen-containing fuel.

Combustion system having an emission control device

A fuel cell system has a reformer unit ( ) for generating a reformate which is provided as a fuel for a fuel cell unit ( ). The fuel cell system includes a sensor ( ) for monitoring the quality of the reformate and a valve ( ) which can be controlled in dependence upon the sensor. Compared to conventional systems, the valve can react very rapidly to disturbances in the preparation of the reformate and can especially prevent that disturbances lead to damage of the fuel cell unit ( ) and the electrical output power of the fuel cell unit continues to be controllable. This is achieved in that at least one storage unit ( ) is provided for feeding fuel to the fuel cell unit ( ) in dependence upon the quality of the reformate.

Fuel cell system having a reformer unit

Chemical microreactors for chemical systhesis and their methods of manufacture are known, but have disadvantages such as extremely high manufacturing costs or poor flexibility for adaptation to various cases of application. These disadvantages are avoided by means of the microreactors and manufacturing methods according to the invention. The microreactors are characterized in that the reactors contain fluid ducts in at least one plane as well as feed and return lines for fluids, wherein the fluid ducts are defined by side walls of metal opposing each other and further side walls of metal or plastic extending between said side walls, and in which the planes are connected together and/or with a closure segment closing open fluid ducts by means of appropriate solder or adhesive layers. The manufacturing method is characterized by process sequences in which the individual reactor planes produced by means of electrolytic methods, are connected together by soldering or gluing.

Chemical microreactors and method for producing same

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Ditzingen, Germany

Norbert Breuer