Abnormality determination apparatus and method for oxygen...

Details Abnormality determination apparatus and method for oxygen... Abnormality determination apparatus and method for oxygen...

2010-01-27

2011-11-29

Kirkland, III, Freddie (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Exhaust system

C073S114730

Reexamination Certificate

active

08065910

ABSTRACT:
An abnormality determination apparatus for an oxygen sensor provided on the downstream side of a catalyst includes: a first determination portion that determines whether amount of decline in output value of the oxygen sensor during a period from when amount of intake air or exhaust gas declines before a fuel cut is started to when the fuel cut is started is smaller than a reference amount of decline; a second determination portion that determines whether degree of change in the output value when the output value changes from a first reference value to a second reference value that shows a leaner state than the first reference value is more gradual than a set degree of change after the fuel cut is started; and a third determination portion that determines whether the oxygen sensor is abnormal based on determinations by the first determination portion the second determination portion.

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patent: 09170966 (1997-06-01), None
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