Recognizing state of nitrogen oxide storage catalyst in exhaust gas stream of IC engine involves detecting two independent electrical parameters of electrical complex impedance of catalyst

Process for recognizing the state of a NOx storage catalyst in the exhaust gas stream of an IC engine involves detecting two independent electrical parameters of the electrical complex impedance of the catalyst. One of the parameters is a measure for the degree of load of the catalyst and the other...

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Bibliographische Detailangaben
Hauptverfasser:	VOIGTLAENDER, DIRK, RIED, THOMAS, PLOG, CARSTEN, MOOS, RALF, LEYE, HOLGER, BIRKHOFER, THOMAS, KNEZEVIC, ALEKSANDAR
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION COMBUSTION ENGINES CONTROLLING COMBUSTION ENGINES ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LIGHTING MACHINES OR ENGINES IN GENERAL MEASURING MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PHYSICS SEPARATION STEAM ENGINES TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TESTING TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	Process for recognizing the state of a NOx storage catalyst in the exhaust gas stream of an IC engine involves detecting two independent electrical parameters of the electrical complex impedance of the catalyst. One of the parameters is a measure for the degree of load of the catalyst and the other parameter is used to determine the end of the regeneration of the catalyst. Preferred Features: The parameters are ohmic resistance and capacity, amount or actual part of the impedance, ohmic resistance and amount of the impedance or amount and phase of the impedance. The detection of the two parameters is carried out in the rear region of the catalyst, especially in the last third of the catalyst. Die Erfindung betrifft ein Verfahren zur Erkennung des Zustands eines NOx-Speicherkatalysators, welcher im Abgasstrom einer Verbrennungskraftmaschine zyklisch mit NOx beladen und regeneriert wird. Gemäß der Erfindung werden zwei voneinander unabhängige elektrische Bestimmungsgrößen der elektrischen komplexen Impedanz des NOx-Speicherkatalysators detektiert, wobei eine der beiden elektrischen Größen ein Maß für den Beladungsgrad des NOx-Speicherkatalysators ist, und aus der zweiten elektrischen Größe der Zeitpunkt für das Ende des Regenerationsvorgangs des NOx-Katalysators erkannt werden kann.