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:
Dec. 24, 2002
Filed:
Jun. 29, 2001
Wilfried Tuleweit, Schwieberdingen, DE;
Joerg Lange, Eberdingen, DE;
Klaus Hirschmann, Leonberg, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method for monitoring a secondary air system in combination with the exhaust-gas system of a motor vehicle is described. The method includes the steps of: providing a probe downstream of the junction of a secondary air line into the exhaust-gas channel; obtaining an air/fuel ratio (&lgr; ) utilizing the probe; obtaining a signal for the intake air flow (mass ); arithmetically determining the secondary air mass (mass ) in dependence upon (a) the ratio of intake air flow to fuel (&lgr; ), which is metered per unit of time; (b) the air/fuel ratio (&lgr; ); and, (c) the signal for the intake air flow (mass ); and, evaluating the operability of the secondary air system in dependence upon the secondary air mass (mass ).