Polarographic sensor
AssigneeRobert Bosch GmbH
InventorsKarl-Hermann Friese, Hermann Dietz, Werner Gruenwald
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Abstract
A polarographic sensor for determining concentration of certain components including oxygen or combustible fractions, such as hydrocarbons, hydrogen and carbon monoxide, in the exhaust gas of an internal combustion engine, includes a pump cell having an anode, a cathode, and an oxygen ion-conducting solid electrolyte provided between the anode and the cathode, wherein the cathode is provided with a diffusion barrier, wherein the anode is provided with a diffusion barrier, and wherein the concentration of the certain components is determined by measurement of a limiting current through the electrolyte and across one of the diffusion barriers to the corresponding anode or cathode.
Claims7
A polarographic sensor for determining concentration of certain components including oxygen or combustible fractions, such as hydrocarbons, hydrogen and carbon monoxide, in the exhaust gas of an internal combustion engine, comprising:
- a pump cell having an anode, a cathode, and an oxygen ion-conducting solid electrolyte provided between the anode and the cathode,
- wherein the cathode is provided with a diffusion barrier,
- wherein the anode is provided with a diffusion barrier, and
- wherein the concentration of the certain components is determined by measurement of a limiting current through the electrolyte and across one of the diffusion barriers to the corresponding anode or cathode.
In combination with an internal combustion engine, an apparatus comprising a polarographic sensor according to claim 4 for regulating the ratio of the components of an air-fuel mixture supplied to the internal combustion engine.
In combination with an internal combustion engine, an apparatus comprising a polarographic sensor according to claim 5 for regulating the ratio of the components of an air-fuel mixture supplied to the internal combustion engine.
Dependencies are inferred from the claim text.