Electrochemical sensor structure to determine oxygen content in combustion exhaust gases

US4283261A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Helmut Maurer · Rodenbach, DE
• Klaus Muller · Tamm, DE
• Franz Rieger · Aalen, DE
• Ernst Linder · Mühlacker, DE
• Hermann Dietz · Gerlingen, DE
• Karl-Hermann Friese · Leonberg, DE
• Bodo Ziegler · Stuttgart, DE

Key dates

• Filing date: Dec 4, 1979
• Grant date: Aug 11, 1981
• Expiry date: Dec 4, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4071
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To measure partial oxygen pressure in gases, particularly exhaust gases of automotive-type combustion engines, a solid electrolyte plate of elongated rectangular configuration has at least one electrode pair applied to a single surface thereof, which is exposed to the measuring gas. Preferably, the gap between electrodes is elongated, by forming the electrodes in comb-interdigited form. A thermocouple - temperature sensor can be applied between connecting tracks for the electrodes which extend longitudinally of the electrolyte plate towards the other end thereof, through a sealing mass holding the plate within a housing, the other end forming, simultaneously, a connection terminal for connection to an electric connector or plug. A heating element can be placed on the obverse side of the plate, preferably in the position in the gap between the electrodes. More than one such sensor element may be secured in the same housing, and, for example, two such plates, back to back, with the heating element therebetween, spaced from each other, or as a common block. The sensor may be used for potentiometric and/or polarographic measurement, depending upon cover coatings on the electrodes which…