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:
Nov. 17, 2015
Filed:
Nov. 05, 2010
LU Chen, Bietigheim-Bissingen, DE;
Eberhard Schnaibel, Hemmingen, DE;
Andreas Koring, Reutlingen, DE;
Richard Holberg, Stuttgart, DE;
Michael Fey, Wiernsheim, DE;
Lu Chen, Bietigheim-Bissingen, DE;
Eberhard Schnaibel, Hemmingen, DE;
Andreas Koring, Reutlingen, DE;
Richard Holberg, Stuttgart, DE;
Michael Fey, Wiernsheim, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention relates to a method and device for diagnosing deviations in a single cylinder lambda control in an internal combustion engine having at least two cylinders and an exhaust gas sensor designed as a broadband lambda sensor, wherein a pump current is evaluated by means of a pump cell and the pump current is used at least temporarily for an individual cylinder lambda control. According to the invention, a pump voltage or a pump voltage change is determined via the pump cell in addition to the pump current and the value is transmitted to a diagnosis apparatus. Deviations in the single cylinder lambda control can thus be better diagnosed without additional material expense according to the invention, which provides advantages in particular in respect of tightened rulemaking in on-board diagnosis. A preferred application of the method is the use in internal combustion engines having multi-bank exhaust systems.