DIAGNOSIS OF A CRACKED MULTI-CHAMBER SOLID-ELECTROLYTE GAS SENSOR
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United States of America Patent
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app pub date -
Dec 29, 2011
filing date -
Jul 6, 2006
priority date (Note) -
Abandoned
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Abstract
A diagnosis method and a gas sensor that is adapted to perform the diagnosis method are described for detecting a damage of a gas sensor causing a malfunction, particularly a crack, wherein the gas sensor has at least two chambers with one chamber comprising a reference gas. The method includes pumping out gas of one of the chambers, measuring a value of a variable being proportional to the concentration of the gas as a function of time, comparing the measured variable value and/or the measured time to a predetermined threshold, detecting a damage of the sensor if the measured variable value and/or the measured time is outside the interval of normal mode of operation defined by the corresponding predetermined threshold.
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