Disorder diagnosis device for fuel injection apparatus

Details Disorder diagnosis device for fuel injection apparatus Disorder diagnosis device for fuel injection apparatus

1992-02-05

1993-02-09

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123479, F02D 4114

Patent

active

051845954

ABSTRACT:
A disorder diagnosis device for a combustion engine having a fuel injector for each cylinder and a fuel system for supplying fuel to the injector comprises an air-fuel ratio sensor provided at an exhaust tube of the combustion engine for providing an air-fuel ratio signal indicative of an air-fuel ratio, and a control unit responsive to the air-fuel ratio sensor for calculating a first value by comparing the air-fuel ratio signal with a preset value and for calculating a second value by comparing a signal corresponding to the air-fuel ratio signal with a predetermined value so as to decide if the fuel system is in disorder on the basis of a combination of the first and second values.

REFERENCES:
patent: 4638658 (1987-10-01), Otobe
patent: 4887576 (1989-12-01), Inamoto et al.
patent: 5070847 (1991-12-01), Akiyama et al.

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