Abnormality diagnosis device for air-fuel ratio sensor

Details Abnormality diagnosis device for air-fuel ratio sensor Abnormality diagnosis device for air-fuel ratio sensor

2007-05-15

2007-05-15

Solis, Erick (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S688000, C123S690000, C701S103000, C701S107000, C701S109000

Reexamination Certificate

active

11437674

ABSTRACT:
When carrying out abnormality determination for an air-fuel ratio sensor33by comparison of an average value tave of all diagnostic values t(n) and an abnormality determination value C, the abnormality determination value C is corrected using an average value Δtave for the disturbance correction values Δt(n). A disturbance correction value Δt(n) is derived by subtracting a correction reference value A, which is a diagnostic value with a normal air-fuel ratio sensor33when there is no disturbance, from the diagnostic value t(n). The present invention provides the abnormality diagnosis device for the air-fuel ratio sensor that can acquire highly precise diagnosis results without lowering frequency of diagnosis accurately taking into consideration the influence of disturbance.

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patent: 7063081 (2006-06-01), Yamada
patent: 10-169493 (1998-06-01), None

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