Sensor for measuring the oxygen content in the exhaust gas of combustion engines and method thereof
AssigneeDegussa AG
InventorsAlfred Bozon, Edgar Koberstein, Hans-Dieter Pletka, Herbert Voelker
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Abstract
An improved lambda sensor is disclosed for the measurement of the oxygen content in the exhaust gas of internal combustion engines in which the sensor element is provided with a gas permeable wrapping coated with a catalyst. The sensor delivers a clear well defined signal in the so-called rich exhaust gas, which makes possible a more precise adjustment of the fuel-air mixture fed to the internal combustion engine.
Claims6
In a sensor for the measurement of the oxygen content in the exhaust gas of internal combustion engines, wherein the solid substance electrolyte sensor element which serves as a producer of electrical sensor signals is fitted with a catalytically active gas permeable wrapping spaced apart from and not in contact with said sensor element, the improvement wherein the wrapping consists of at least one layer of wire gauze of an alloy containing iron, chromium and aluminum surrounding a perforated protection tube surrounding said sensor element, said wire gauze being coated with an intermediate layer of metal oxide promoting catalysis and said intermediate layer being impregnated with a metal of the platinum group or with a combination of at least one platinum group metal and at least one base metal.
Dependencies are inferred from the claim text.