Control apparatus for internal combustion engine

Details Control apparatus for internal combustion engine Control apparatus for internal combustion engine

1989-09-22

1990-12-25

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

123489, 123198DB, F02D 4122

Patent

active

049794817

ABSTRACT:
A control apparatus for an internal combustion engine has cylinders each of which is provided with an exclusive fuel injection valve individually driven their openings. Each cylinder has a misfiring detecting means for detecting misfiring of that cylinder. The control apparatus includes a drive stopping means for stopping the driving of the fuel injection valve corresponding to a misfired cylinder so as to stop fuel supply to that misfired cylinder. The apparatus is further provided an air-to-fuel ratio sensor in the exhaust path of the engine so that when misfiring of the cylinder is detected, the fuel injection valves remain controlled through a feedback control where the openings of the normally fired cylinders are controlled in accordance with the air-to-fuel ratio signal outputted from the air-to-fuel ratio sensor in such a way that the apparent air-to-fuel ratio of the cylinders is given by an equation L=nLo/(n-p) where L is the apparent value of the air-to-fuel ratio of the cylinders when p cylinders are misfired, n is the number of cylinders, Lo is the air-to-fuel ratio of the cylinders when all of the cylinders are normally operating, and p is the number of misfired cylinders.

REFERENCES:
patent: 4006718 (1977-02-01), Konomi
patent: 4499876 (1985-02-01), Yamamoto
patent: 4886029 (1989-12-01), Lill et al.

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