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:
Sep. 20, 2011
Filed:
Jan. 03, 2007
Hermann Hahn, Hannover, DE;
Hermann Hahn, Hannover, DE;
Volkswagen AG, Wolfsburg, DE;
Abstract
In a method and device for mixture control for an internal combustion engine having at least one catalytic converter disposed in an exhaust system of the internal combustion engine and a λ-closed-loop control, a value being ascertained for the loading of the catalytic converter with oxygen and the mixture being changed as a function of the ascertained value, a first mixture change is made in the direction of rich exhaust gas when the ascertained value of the oxygen loading has increased by more than a first predefined measure within a predetermined time span and/or after throughput of a predetermined quantity of exhaust-gas mass; and/or a second mixture change is made in the direction of lean exhaust gas when the ascertained value of the oxygen loading has dropped by more than a second predefined measure within a predetermined time span and/or after throughput of a predetermined quantity of exhaust-gas mass.