Gas sensor

US6936149B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Thomas Wahl · Pforzheim, DE
• Torsten Handler · Stuttgart, DE
• Harry Braun · Heimsheim, DE
• Sven Boeffert · Neuenbürg, DE
• Lothar Diehl · Stuttgart, DE

Key dates

• Filing date: Apr 1, 2002
• Grant date: Aug 30, 2005
• Expiry date: Apr 4, 2023

Classification

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

Abstract

A gas sensor for determining a physical quantity of a gas component, e.g., in an exhaust gas of an internal combustion engine, including a sensor element which contains at least one electrochemical cell. The electrochemical cell includes a first electrode and a second electrode that are arranged at a distance on at least one solid electrolyte, the second electrode is arranged in a reference gas space. A third electrode which is in contact with a gas located in the gas space is provided. The gas component may be exchanged between the gas space and the reference gas space using a voltage applied between the second electrode and the third electrode.