AIR-FUEL RATIO CONTROLLING METHOD AND DEVICE FOR INTERNAL COMBUSTION ENGINES

摘要

The invention relates to an air-fuel ratio controlling method and a device for internal combustion engines, having a detector (11) for a flow rate of the air supplied into a cylinder (4), a means (7) for detecting a ratio of a flow rate of the air supplied into the cylinder (4) to that of a fuel supplied thereinto, a control means (8) for setting an air-fuel ratio to an optimum level on the basis of output signals from the air-fuel ratio detecting means (7) and air flow rate detector (11) and a means (9) for controlling the supplying of the fuel into the cylinder in accordance wih an output signal from the air-fuel ratio control means. The air-fuel ratio detecting means (7) has members for detecting the light generated by a flame in the cylinder and having at least two special wavelengths. The combustion condition corresponding to an air-fuel ratio in the cylinder is detected by the light-detecting members, and a signal representaive of an actual air-fuel ratio is generated on the basis of outputs therefrom.