Method and device for detecting at least a portion of the measuring gas component containing bound oxygen in a gas mixture

US10429344B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dirk Daecke · Munich, DE
• Jan Dominique Makowski · Stuttgart, DE
• Moritz Waldorf · Stuttgart, DE
• Reinhard Hein · Sachsenheim, DE
• Andreas Dreyer · Ditzingen, DE
• Peter Oechtering · Karlsruhe, DE

Key dates

• Filing date: Sep 1, 2015
• Grant date: Oct 1, 2019
• Expiry date: Aug 2, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/417
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and a device are described for detecting at least a portion of a measuring gas component containing bound oxygen in a gas mixture, in particular in an exhaust gas of an internal combustion engine, in a measuring gas chamber by detecting a portion of oxygen that is generated by a reduction of the measuring gas component containing the bound oxygen, in the presence of molecular oxygen, in the device, which includes at least one first pump cell, one reference cell, and one second pump cell. The method includes the following steps: a) generating a first pump current in the first pump cell in such a way that transport of a first portion of oxygen ions takes place between the measuring gas chamber and the surroundings of the device; b) applying a reference pump current to the reference cell in such a way that a second portion of the oxygen ions is transported into a reference gas chamber; c) decomposing the measuring gas component containing the bound oxygen by catalysis at an electrode of the second pump cell, as the result of which additional molecular oxygen is generated from the measuring gas component; d) applying a second pump current to the second pump cell in such a way …