Apparatus for diagnosing abnormality in fuel injection system an

Details Apparatus for diagnosing abnormality in fuel injection system an Apparatus for diagnosing abnormality in fuel injection system an

1992-02-27

1993-01-26

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02M 5100

Patent

active

051814994

ABSTRACT:
In an apparatus for diagnosing an abnormality in a fuel injection system in which an injection quantity is feedback-controlled by adjusting a first air-fuel ratio correction value so that an air-fuel ratio is equal to a target air-fuel ratio. The injection quantity is also adjusted by a second air-fuel ratio correction value. When the first air-fuel ratio correction value has reached a first upper limit value, the second air-fuel ratio correction value is set to a second upper limit value. When the first air-fuel ratio correction value has reached a second lower limit value, the second air-fuel ratio correction value is set to a second lower limit value. When the first air-fuel ratio correction value is outside of a predetermined range when a predetermined time has elapsed after the second air-fuel ratio correction value is set to either the second upper limit value or the second lower limit value, it is determined that a fault has occured in the fuel injection system.

REFERENCES:
patent: 4819601 (1989-04-01), Harada et al.
patent: 4947818 (1990-08-01), Kamohara et al.
patent: 5070847 (1991-12-01), Akiyawa et al.
patent: 5090389 (1992-02-01), Oata
patent: 5094214 (1992-03-01), Kotzan
patent: 5126943 (1992-06-01), Nakaniwa
patent: 5131372 (1992-07-01), Nakaniwa

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