The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 2008
Filed:
Apr. 06, 2004
Andreas Pfaeffle, Wuestenrot, DE;
Wolfgang Klenk, Loechgau, DE;
Stefan Scherer, Suttgart, DE;
Simone Neuberth, Walzbachtal, DE;
Albrecht Schwaderer, Untergruppenbach, DE;
Andreas Pfaeffle, Wuestenrot, DE;
Wolfgang Klenk, Loechgau, DE;
Stefan Scherer, Suttgart, DE;
Simone Neuberth, Walzbachtal, DE;
Albrecht Schwaderer, Untergruppenbach, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method is described for operating an internal combustion engine, in particular of a motor vehicle. In the method, a lean air/fuel mixture is burned in a combustion chamber; nitrogen oxides contained in the exhaust gas are stored in an accumulator-type catalytic converter; a storage efficiency, with which the accumulator-type catalytic converter stores the nitrogen oxides contained in the exhaust gas, is ascertained; and the storage efficiency is ascertained as a function of an instantaneous space velocity of the exhaust gases in the accumulator-type catalytic converter. Two efficiencies are ascertained at least as a function of the temperature of the accumulator-type catalytic converter and a space velocity. One of the two efficiencies is ascertained for a great space velocity, and the other efficiency is ascertained for a small space velocity. The storage efficiency is ascertained as a function of the instantaneous space velocity from the two efficiencies.