Abnormality detecting apparatus and abnormality detecting...

Details Abnormality detecting apparatus and abnormality detecting... Abnormality detecting apparatus and abnormality detecting...

2007-11-13

2007-11-13

Argenbright, T. M. (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C073S001060, C123S690000, C204S401000, C702S185000

Reexamination Certificate

active

11478608

ABSTRACT:
An abnormality detecting apparatus includes an air/fuel ratio sensor that detects an air/fuel ratio within a range including the stoichiometric air/fuel ratio, an admittance detector for detecting an admittance of the sensor, and a temperature detector for detecting a temperature of the sensor. This apparatus detects an abnormality of the sensor when the detected temperature is at a first temperature which is higher than an activation temperature of the sensor and the detected admittance is less than a first determining value. The apparatus also detects a disconnection abnormality of the sensor when the detected temperature is at a second temperature, which is higher than a minimum temperature at which admittance can be detected for a normally operation and lower than the first temperature, and the detected admittance is less than a second determining value for determining disconnection of the sensor which is less than the first determining value.

REFERENCES:
patent: 5781878 (1998-07-01), Mizoguchi et al.
patent: 6850870 (2005-02-01), Saga
patent: 6912887 (2005-07-01), Ikeda
patent: 2004/0099528 (2004-05-01), Hattori
patent: 2005/0029098 (2005-02-01), Aoki et al.
patent: 2004-125738 (2004-04-01), None

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