Damage preventing method and device for sensor element of air/fuel ratio sensor with heater
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United States of America Patent
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Oct 11, 1994
Grant Date -
N/A
app pub date -
Feb 22, 1993
filing date -
Feb 20, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an internal combustion engine, an air/fuel ratio senator containing a heater for promoting activation of a sensor element is constituted such that turning-on and heating by the heater is started only after a deviation of an output of the air/fuel ratio sensor becomes more than a predetermined value after starting of the engine. Therefore, forced heating by the heater begins only after moisture in the exhaust adhering to the sensor element is made to fully evaporate by exhaust heat, thereby preventing damage on the sensor element. The damage would be caused by thermal shock due to a difference in the temperature between the inner and the outer surfaces of the sensor element due to forced heating of the moisture.
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