Detecting device and method of an abnormality in an air-fuel rat

Details Detecting device and method of an abnormality in an air-fuel rat Detecting device and method of an abnormality in an air-fuel rat

1993-02-18

1994-04-05

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02M 700, F02M 5100

Patent

active

052995500

ABSTRACT:
In an abnormality detecting device and method for an air-fuel ratio control system of an internal combustion engine, first discriminating whether a renewing number NLR of grids in a map of air-fuel ratio learning control is larger than a set value or not. If the number is larger than the set value, the difference between the number and previously renewed learning values is calculated. Then, judging whether the difference is larger than a predetermined value or not. If the difference is larger than the predetermined value, it is judged that an abnormality occurs in an intake air measurement system or a fuel injection system of an air-fuel ratio control system. Accordingly, the abnormality in the systems is distinguished from the deterioration due to normal aging.

REFERENCES:
patent: 5080064 (1992-01-01), Buslepp et al.
patent: 5131372 (1992-07-01), Nakaniwa
patent: 5182907 (1993-02-01), Kuroda et al.
patent: 5193339 (1993-03-01), Furuya
patent: 5243951 (1993-09-01), Nakaniwa
patent: 5247445 (1993-09-01), Miyano et al.

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