Failure diagnosis device for O2 sensor

Details Failure diagnosis device for O2 sensor Failure diagnosis device for O2 sensor

2005-02-01

2005-02-01

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Performance or efficiency evaluation

C702S183000, C123S685000, C123S688000

Reexamination Certificate

active

06850870

ABSTRACT:
A failure diagnosis device for an O2sensor includes an O2sensor; a heater driving unit driving a heater heating the O2sensor; and a diagnosis unit controlling the heater driving unit heating the heater, and diagnosing O2sensor failure after a given amount of time based on an O2sensor activation status determination using O2sensor outputs. The diagnosis unit includes a heater controlling unit controlling the heater driving unit; a time measuring unit measuring time that electric current is supplied to the heater, and time used in determining sensor abnormality; an activation status determining unit determining air/fuel ratio changes from a lean to rich state, or from a rich to lean state based on the O2sensor output; and a failure determining unit determining sensor abnormality based on outputs from the time measuring unit and the activation status determining unit, thereby diagnosing O2sensor failure without engine operation.

REFERENCES:
patent: 5423203 (1995-06-01), Namiki et al.
patent: 5709198 (1998-01-01), Sagisaka et al.
patent: 5928303 (1999-07-01), Sakai
patent: 6136169 (2000-10-01), Okamoto
patent: 6453720 (2002-09-01), Tomisawa
patent: 3227912 (2001-09-01), None

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