초록 ▼

An emission control system for an internal-combustion engine has at least one nitrogen oxide adsorber for the periodic adsorption and desorption of nitrogen oxides contained in the exhaust gas of the internal-combustion engine. A desorption gas pipe has an externally heatable catalyst arranged there

An emission control system for an internal-combustion engine has at least one nitrogen oxide adsorber for the periodic adsorption and desorption of nitrogen oxides contained in the exhaust gas of the internal-combustion engine. A desorption gas pipe has an externally heatable catalyst arranged therein to which a mixture of air and/or exhaust gas can be fed as well as fuel at an at least stoichiometric proportion. This mixture is burned to form a desorbing gas flow which is fed to the respective nitrogen oxide adsorber for the nitrogen oxide desorption.

대표청구항 ▼

[ What is claimed is:] [1.] Emission control system for an internal-combustion engine, having at least two nitrogen oxide adsorbers arranged in parallel for alternating periodic adsorption and desorption of nitrogen oxides contained in exhaust gas of the internal-combustion engine and devices for pr

[ What is claimed is:] [1.] Emission control system for an internal-combustion engine, having at least two nitrogen oxide adsorbers arranged in parallel for alternating periodic adsorption and desorption of nitrogen oxides contained in exhaust gas of the internal-combustion engine and devices for providing a desorption gas flow for each of the nitrogen oxide adsorbers running in desorption mode,whereinthe desorption gas flow providing devices have a desorption gas pipe which the nitrogen oxide adsorbers share and which has an externally heatable catalyst, a lambda probe operatively arranged between the externally heatable catalyst and the nitrogen oxide adsorbers, and devices for feeding a mixture of air and/or exhaust gas as well as fuel at an at least stoichiometric, controllable proportion, to the externally heatable catalyst, such that the externally heatable catalyst burns the fed mixture to form a desorbing gas flow which is fed to the nitrogen oxide adsorber in the desorption mode, by way of an associated desorption pipe branch with a predefinable lambda value of the desorbing gas flow being adjusted by the lambda probe.