Method and system for recognizing the readiness for operation of an oxygen measurement sensor

US4742808A · kind A · utility

Assignee

• VDO Adolf Schindling AG · DE

Inventors

• Thomas Blumel · Möhrendorf, DE
• Harald Collonia · Königstein, DE

Key dates

• Filing date: Aug 14, 1987
• Grant date: May 10, 1988
• Expiry date: Aug 14, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/007
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for detecting the readiness for operation of an oxygen measurement sensor which is located in the exhaust pipe of an internal combustion engine and serves, together with a regulating device, to regulate the preparation of the mixture for the internal combustion engine. The voltage present at the oxygen measurement sensor is measured in succession for two different conditions of load and the internal resistance is calculated from the results of the measurement and compared with a predetermined value.