Element crack detecting apparatus and method for oxygen sensor

Details Element crack detecting apparatus and method for oxygen sensor Element crack detecting apparatus and method for oxygen sensor

2007-12-25

2007-12-25

Argenbright, T. M (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C073S001060, C123S690000, C204S401000

Reexamination Certificate

active

11482820

ABSTRACT:
An element crack detecting apparatus for an oxygen sensor detects a sensor output voltage for an abnormality detection period after a fuel cut-off is started during operation of an engine. When the output voltage becomes negative, an abnormality counter is counted up. When the abnormality counter value reaches a determination value, it is determined that the element crack is present. The abnormality detection period is variably set in response to an engine rotational speed, an intake air quantity and the mixture state immediately before the fuel cut-off is effected. The determination value is variably set in response to the oxygen sensor temperature and the mixture state immediately before the fuel cut-off is effected. Further, the determination value is variably set in response to a magnitude of the negative voltage of the oxygen sensor.

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