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. 29, 2009
Filed:
Jan. 03, 2005
Bernd Kesch, Hemmingen, DE;
Detlef Heinrich, Ludwigsburg, DE;
Achim Guenther, Sindelfingen, DE;
Christof Thiel, Heilbronn, DE;
Juergen Foerster, Ingersheim, DE;
Bernd Kesch, Hemmingen, DE;
Detlef Heinrich, Ludwigsburg, DE;
Achim Guenther, Sindelfingen, DE;
Christof Thiel, Heilbronn, DE;
Juergen Foerster, Ingersheim, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method for diagnosing a secondary-air system of an internal combustion engine. The secondary-air system introduces secondary air into the exhaust-gas region of the internal combustion engine, the secondary air exothermically reacting together with combustible exhaust-gas components, and a thermoreactor being formed in the reaction region. The method provides for a measure of the secondary air to be ascertained from the thermal behavior in the thermoreactor and evaluated. The measure of the secondary air, which reflects, for example, the volumetric flow rate of the secondary air, the mass flow rate of the secondary air, or the amount or mass of secondary air flowing in a time interval, is compared to at least one threshold value. At least one diagnostic signal is then generated as a function of the comparison result.