Oxygen sensor abnormality detecting device having offset...

Details Oxygen sensor abnormality detecting device having offset... Oxygen sensor abnormality detecting device having offset...

2005-07-05

2005-07-05

Garber, Charles (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Gas or liquid analyzer

C324S523000

Reexamination Certificate

active

06912887

ABSTRACT:
An oxygen sensor abnormality detecting device has first and second offset circuits for applying first and second offset voltages to a ground line and an output line of an oxygen sensor. The device compares the voltage of the output line with a high voltage-side shorting determination value, a low voltage-side shorting determination value and a break determination value to detect a high voltage-side shorting, a low voltage-side shorting and a line break.

REFERENCES:
patent: 4337745 (1982-07-01), Pomerantz
patent: 5255554 (1993-10-01), Mallebrein et al.
patent: 5298865 (1994-03-01), Denz et al.
patent: 5313121 (1994-05-01), Cianci et al.
patent: 5359852 (1994-11-01), Curran et al.
patent: 5901691 (1999-05-01), Katoh
patent: 2004/0100271 (2004-05-01), Ikeda

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