System for diagnosing degradation of air-fuel sensor

Details System for diagnosing degradation of air-fuel sensor System for diagnosing degradation of air-fuel sensor

2006-05-09

2006-05-09

Huynh, Hai (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C701S103000, C701S109000, C073S118040

Reexamination Certificate

active

07040307

ABSTRACT:
An air-fuel ratio detected by an air-fuel ratio sensor is periodically varied by executing a PI control. During the PI control, a time period in which the detected air-fuel ratio passes through a predetermined rich-side range is defined as a rich-side time constant, and a time period in which the detected air fuel ratio passes through a predetermined lean-side range is defined as a lean-side time constant. A rich-side time delay represents a time period in which an air-fuel correction amount is increasingly corrected to exceed a rich-side threshold, and a lean-side time delay represents a time period in which the air-fuel correction amount is decreasingly corrected to exceed a lean-side threshold. These time constants and time delays are compared with a determining value to diagnose degradation of an air-fuel ratio sensor.

REFERENCES:
patent: 5335539 (1994-08-01), Sweppy et al.
patent: 5557933 (1996-09-01), Numata et al.
patent: 5672817 (1997-09-01), Sagisaka et al.
patent: 5724952 (1998-03-01), Miyashita et al.
patent: 5956943 (1999-09-01), Carnevale et al.
patent: 6901741 (2005-06-01), Kobayashi et al.
patent: 2003/0000207 (2003-01-01), Nakagawa et al.
patent: 2003/0192305 (2003-10-01), Iihoshi et al.
patent: 2005/0072410 (2005-04-01), Ohsaki
patent: 4-311644 (1992-11-01), None

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