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. 29, 1994
Filed:
Apr. 24, 1992
Helmut Denz, Stuttgart, DE;
Werner Mezger, Eberstadt, DE;
Johannes-Dieter Wichterich, Hemmingen, DE;
Ernst Wild, Oberriexingen, DE;
Joachim Heimes, Eberdingen, DE;
Eugen Joos, Freiberg, DE;
Lothar Raff, Remseck, DE;
Eberhard Schnaibel, Hemmingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention is directed to a connecting circuit for a potential-free lambda probe having a ground line and a signal line and having an offset voltage source which is connected to the ground line. This offset voltage source raises the potential of the ground line to a pregiven value relative to ground. A ground short is directly detectable in the connecting circuit of the invention in that the potential measured at the signal line drops below the offset voltage. In this way, it is no longer required as in conventional circuits to check for a ground short by enriching the mixture of an engine and to monitor the exhaust gas with the lambda probe.