Sensor element for determining the oxygen concentration in gas mixtures and method for its manufacture

US6767442B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Heiner Scheer · Gnarrenburg, DE
• Udo Jauernig · Lichtenstein, DE
• Hans-Joerg Renz · Echterdingen, DE
• Lothar Diehl · Stuttgart, DE
• Dieter Lindauer · Rochlitz, DE
• Juergen Karle · Rutesheim, DE

Key dates

• Filing date: Jul 30, 2001
• Grant date: Jul 27, 2004
• Expiry date: Oct 16, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/419
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A sensor element for determining the concentration of gas components in gas mixtures, particularly for determining the oxygen concentration in exhaust gases of internal combustion engines. It contains a pump cell, which pumps oxygen into or out of a measuring gas chamber, as well as a concentration cell, which has a reference electrode situated in the reference gas channel, and has a measuring electrode. The measuring gas chamber and the reference gas channel are situated in the same layer plane of the sensor element, and are separated from each other by a partition, which is produced by applying a ceramic paste to an adjacent, solid electrolyte foil.