AIR-FUEL RATIO FEEDBACK CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE

PURPOSE:To facilitate adjustment of the air fuel ratio by selecting at least one of the correction value memory tables, selecting memory value on the selected correction value memory table, and by setting at least one of the correction values to the selected memory value. CONSTITUTION:An ECU 5 compares the sensed value of the exhaust gas concentration, which is sensed by an O2 sensor 15 installed on the exhaust pipe 13 of an internal combustion engine 1, with a certain reference value, and according to this result from comparison the air fuel ratio of the mixture gas is feedback controlled to the target air-fuel ratio. At this time, the feedback control is made with at least either of proportionate control due to No.1 correction value and the integral control due to No.2 correction value. A changeover means 16 selects at least one of the correction value tables. Memory value on the correction value memory table selected according to the operating parameters of the internal combustion engine 1 and the set voltage is selected, and setting is made to the memory value with at least either of No.1 and No.2 correction values selected.