Title: Internal combustion engine exhaust gas oxygen sensor and catalyzer combination

Abstract: To avoid temperature shock and mechanical damage to oxygen sensors with ion conductive solid electrolytes exposed to the exhaust gases of internal combustion engines, a catalyst, for example in the form of aluminum oxide pellets having a catalyzing surface layer, is located to surround the oxygen sensor, or just in advance of the oxygen sensor in a bypass pipe, branching off from the exhaust gas pipe of the engine to take samples of the exhaust gases so that the sensor and catalyst form an assembly, or sensing combination. The catalyzing layer may be platinum, or a platinum metal, or an alloy of platinum with aluminum, cobalt, nickel, or chromium, or may be mineral wool, or wool of glass, or asbestos fibers having their surface coated with any of the foregoing catalysts.

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Inventors: Linder, Ernst (Muhlacker, DE, US)
Steinke, Leo (Hegnach, DE, US)
Rieger, Franz (Wasseralfingen, DE, US)

Application Number: 747480
Filing Date: 1976-12-06
Publication_date: 1979-01-02
Assignee: Robert Bosch GmbH (Stuttgart, DE1)
Primary Class(es): 204/428 423/213.5
Other Classes:
US Patent Ref:

3189563	Jun, 1965	Hauel	23/288.
3544264	Dec, 1970	Hardison	423/213.
3616274	Oct, 1971	Eddy	60/276.
3654111	Apr, 1972	Csuros	204/195.
3768259	Oct, 1973	Carnahan et al.	204/195.
3835012	Sep, 1974	Hemak	204/195.
3841987	Oct, 1974	Friese et al.	204/195.
3844920	Oct, 1974	Burgett et al.	204/195.
3935089	Jan, 1976	Togawa et al.	204/195.
3981785	Sep, 1976	Sandler	204/195.

Other Refs: 1511066

Dec, 1967	FR

Primary Examiner: Tung, T.
Assistant Examiner:
Attorney: Flynn & Frishauf