Method and device for examining an exhaust gas sensor

US9068937B2 · kind B2 · utility

Assignee

• CONTINENTAL AUTOMOTIVE GMBH · DE

Inventors

• Muammer Kilinc · Regensburg, DE
• Tim Walde · Regensburg, DE

Key dates

• Filing date: Aug 18, 2009
• Grant date: Jun 30, 2015
• Expiry date: Apr 26, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2560/026
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A first voltage (V1) is detected between an auxiliary pump electrode and a reference electrode of an exhaust gas sensor, and a target diagnosis value (SDIAG) is determined as a function of the detected first voltage (V1). A measured current (Im) is detected between a measurement electrode and a second main pump electrode of the exhaust gas sensor, said measured current being set up as the pump current by regulating a second voltage between the measurement electrode and the reference electrode to a pre-defined voltage. An actual diagnosis value (IDIAG) is determined as a function of the detected measured current (Im). An error (ERR) of the exhaust gas sensor is recognized depending on the target diagnosis value (SDIAG) and the actual diagnosis value (IDIAG).