Sensor for determining gas components and/or gas concentrations of gas mixtures

US5476001A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gerhard Hoetzel · Stuttgart, DE
• Harald Neumann · Lambach, DE
• Johann Riegel · Bietigheim-Bissingen, DE
• Karl-Hermann Friese · Leonberg, DE
• Werner Gruenwald · Gerlingen, DE

Key dates

• Filing date: Jun 6, 1994
• Grant date: Dec 19, 1995
• Expiry date: Jun 6, 2014

Classification

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

Abstract

A sensor for determining gas components and/or gas concentrations in gas mixtures, in particular in exhaust gases of internal combustion engines. The sensor has an oxygen pump cell and a measuring element having a sensitive region. Provided between the pump cell and the gas mixture is a diffusion path in which there are formed an oxygen gradient XO.sub.2 and a gradient X.sub.CO of the gas component to be determined, which extend respectively in opposite directions. The measuring element is positioned relative to the pump cell and the diffusion path in such a way that an excess of oxygen is present on the sensitive region of the measuring element.