Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-07-13
2000-03-07
Hofsass, Jeffrey A.
Communications: electrical
Condition responsive indicating system
Specific condition
340438, 123679, 123697, 123690, 73 2331, G08B 2100
Patent
active
060346108
ABSTRACT:
The invention is directed to a method for monitoring the operation of a gas probe, such as a .lambda.-probe for an internal combustion engine. The .lambda.-probe has a probe ceramic (Nernst cell) and a probe heater. The internal resistance (x) of the probe ceramic is measured and a desired value (y) is determined in dependence upon the temperature of the gas to be detected and the heating power of the probe heater. The internal resistance (x) is then compared to the desired value (y) and, when the measured value of the internal resistance (x) exceeds the desired value (y), then a fault signal is generated and/or the fault signal is outputted and/or the fault signal is stored.
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Junginger Erich
Raff Lothar
Schnaibel Eberhard
Hofsass Jeffrey A.
La Anh
Ottesen Walter
Robert & Bosch GmbH
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