Measuring and testing – Gas analysis – With compensation detail
Patent
1996-11-22
1998-06-16
Williams, Hezron E.
Measuring and testing
Gas analysis
With compensation detail
73 3106, 73 2332, 204406, 204429, 422 94, 422108, 123682, 123691, 123703, G01N 3902, G01N 2746, F02D 4114
Patent
active
057673861
ABSTRACT:
An exhaust gas sensor has first and second sensor elements. Exhaust gas surroundings of the first sensor element are catalytically activated, so that an oxygen partial pressure which is in equilibrium will always be measured by the first sensor element, regardless of the conversion capability of a catalytic converter. The exhaust gas surroundings of the second sensor element are separate from the exhaust gas surroundings of the first sensor element, so that the exhaust gas surroundings of the second sensor element are not catalytically active. As a function of the conversion capability of the catalytic converter, the second sensor element measures either an equilibrium oxygen partial pressure or a free oxygen partial pressure, which are of different magnitudes. A malfunction of the catalytic converter is detected by comparing measurement signals of the first and second sensor elements.
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Lemire Bertrand
Schuerz Willibald
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
Wiggins J. David
Williams Hezron E.
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