Method and apparatus for diagnosing an abnormality in a wide ran

Details Method and apparatus for diagnosing an abnormality in a wide ran Method and apparatus for diagnosing an abnormality in a wide ran

1997-12-08

1999-10-26

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

73 2332, F02D 4114

Patent

active

059709677

ABSTRACT:
An object is to carry out abnormality diagnosis of a wide range air-fuel ratio sensor to a high accuracy, with a relatively simple construction. Judgment is made as to whether abnormality diagnosis permit conditions have materialized, and if materialized, a detection value of an air-fuel ratio sensor is monitored. It is then judged if the responsiveness of a change in the detection value of the air-fuel ratio sensor subsequent to changing a target air-fuel ratio is within a predetermined range. If so, an OK judgment is given. If not, an NG judgment is given and a warning lamp is illuminated to advise the driver of the abnormality in the air-fuel ratio sensor so as to take action. With this arrangement, abnormality diagnosis of a wide range air-fuel ratio sensor can be carried out to a high accuracy with a relatively simple construction.

REFERENCES:
patent: 5212947 (1993-05-01), Fujimoto et al.
patent: 5235957 (1993-08-01), Furuya
patent: 5485382 (1996-01-01), Seki et al.
patent: 5610321 (1997-03-01), Shinmoto

Affiliated with

Also associated with

Rating

Method and apparatus for diagnosing an abnormality in a wide ran does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for diagnosing an abnormality in a wide ran, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for diagnosing an abnormality in a wide ran will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-752276