Abstract: A method for operating a catalytic converter used for purifying the exhaust gas of an internal combustion engine, and a device for implementing the method, which provide for an open-loop or closed-loop control of the reagent fill level in the catalytic converter to a predefined storage setpoint value. The targeted stipulation of the storage setpoint value ensures, on one hand, that in non-stationary states of the internal combustion engine, there is a sufficient quantity of reagent available for the completest possible removal of at least one unwanted exhaust-gas component, and on the other hand, a reagent slip is avoided.

Abstract: A device and method for aftertreating exhaust gases in which a controllable valve is used to introduce a supplementary agent in fluid form into the exhaust system at high pressures. The high-pressure promotes an efficient mixture of the supplementary agent for the aftertreatment with the exhaust gas emerging from the internal combustion engine.

Abstract: A method and a device are described for controlling an exhaust gas aftertreatment system for an internal combustion engine. A state variable is ascertained, which characterizes the state of the exhaust gas aftertreatment system. The temperature of the exhaust gas aftertreatment system is controlled as a function of the state of the exhaust gas aftertreatment system and/or of the internal combustion engine.

Abstract: A method and a device for the aftertreatment of exhaust gases of internal combustion engines, in particular for reducing the proportion of NOx in the exhaust gases, the NOx being reduced in the presence of O2 using a reducing agent. The method and the device are characterized in that, prior to the reduction of the NOx, at least a proportion of the NOx or NO contained in the exhaust gas is converted into NO2.

Abstract: A mixing device for mixing the exhaust gas of an internal combustion engine flowing in an exhaust pipe with a reducing agent as well as an exhaust gas purification system having such a mixing device are described. A mixing body that is positionable in the exhaust pipe and having a gas impact surface and a spray impact surface is provided so that exhaust gas flowing from the internal combustion engine is able to strike the gas impact surface and reducing agent, which is suppliable transversely to the exhaust gas flow, is able strike the spray impact surface, the spray impact surface and the gas impact surface forming disjointed sub-areas of the surface of the mixing body. The mixing device distributes the reducing agent uniformly over the cross section of the exhaust pipe and mixes it uniformly with the exhaust gas.

Abstract: An internal combustion engine of a motor vehicle has an adsorption catalyst which may be loaded with nitrogen oxides and unloaded. During the unloading, the exhaust-gas stream through the adsorption catalyst may be decreased by a control unit or an add-on device, using a valve. During the unloading, a fuel/air mixture may be added to the exhaust-gas stream reaching the adsorption catalyst, by the control unit or the add-on device, using an atomizer. Upon switching over from the unloading to the loading of the adsorption catalyst, the addition of the fuel/air mixture to the exhaust-gas stream is initially stopped by the control unit or the add-on device. The decreasing of the exhaust-gas stream is then ended after a predefined flushing time.

Abstract: A method and a system for regenerating, in particular desulfating, storage catalysts (1) in the cleaning of exhaust gas from internal combustion engines (12). During the regeneration phase the combustion is controlled, initially inside the engine, by a control unit (11) in such a way that the air ratio &lgr; in the exhaust gas is lowered to a first value &lgr;1, and subsequently a feed device (5, 6) for the reducing agent is controlled by the control unit (11) in such a way that the air ratio &lgr; is set at a second, lower value &lgr;2<1. This ensures that the temperatures occurring at the entry side (3) of the storage catalyst (1) are sufficient for effective desulfation without damaging the storage catalyst (1).

Abstract: The invention relates to a device and a method for controlling an internal combustion engine, especially an internal combustion engine having an exhaust gas post-treatment system. On the basis of operating parameters which characterize the state of the internal combustion engine and/or the state of the exhaust gas post-treatment system, a parameter characterizing the intensity of a reaction in the exhaust gas post-treatment system is determined. Measures aimed at reducing the speed of the reaction are implemented if said parameter exceeds a threshold value.

Abstract: A method of reducing nitrogen oxides of an exhaust gas, of an exhaust gas of a motor vehicle in particular, is described, an aqueous urea solution being fed to a reactor (42) and converted by thermal, catalytic or enzymatic treatment into a decomposition product containing ammonia and carbon dioxide and at least the ammonia is added to the exhaust gas. The aqueous urea solution contains a substance for transferring heat and for lowering the freezing point (FIG. 7).

Abstract: A device is provided for the exhaust gas treatment of a combustion system, e.g., a diesel combustion system. The device has a first storage unit for storing at least one urea-water solution, and an exhaust gas treatment is implemented without great expenditure. According to the present invention, this result is achieved by the urea-water solution including at least one additive for chemically influencing the urea-water solution.

Abstract: A device and a method are proposed for the introduction of a processing agent downstream of the engine, in particular a fuel, into the exhaust-gas stream of an internal combustion engine, in which a gas discharge for boosting an at least partial of the supplied processing agent is supported.

Abstract: A method and a device are described for controlling an exhaust gas aftertreatment system, especially for an internal combustion engine. A state variable is ascertained, which characterizes the state of the exhaust gas aftertreatment system. The temperature of the exhaust gas aftertreatment system is controlled as a function of the state of the exhaust gas aftertreatment system and/or of the internal combustion engine.

Abstract: Apparatus for storing and metering of reducing agents that may be used within the framework of a catalytic exhaust gas aftertreatment, having a device (10) for storing the reducing agent to be metered and a metering device (20) for applying the reducing agent to the exhaust gas to be treated, the device (10) for storing the reducing agent having an outer container (11) and a cartridge (12), containing the reducing agent, that is able to be exchangeably positioned in it.

Abstract: A device (1) for exhaust treatment of an internal combustion engine, in particular a diesel internal combustion engine, having a particle filter (4), is proposed that is to be realized with less expense than conventional systems and ensures reliable particle filter regeneration. This is obtained according to the invention by the fact that the device (1) comprises a catalytic burner (3), whereby the burner (3) is located between the internal combustion engine and the particle filter (4).

Abstract: A three-dimensional particle image velocimetry method is described, in which a stream system containing light-scattering particles is exposed continuously over a certain period or at least two discrete points in time using a laser lightsheet, and a hologram is produced and evaluated. Increased accuracy in determining velocity is achieved by evaluating the hologram with regard to its phase information interferometrically by using a reconstruction wave and superimposing a reference wave.