AIR-FUEL RATIO CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device of an internal combustion engine for enhancing the total performance by combining different advantages with each other. SOLUTION: The air-fuel ratio control device of the internal combustion engine comprises an exhaust emission purifying catalytic converter 11 mounted on an exhaust pipe 3 of an engine 1, and an air-fuel ratio modulating means to forcibly modulate the air-fuel ratio of exhaust gas led to the catalyst converter 11 between lean and rich. The air-fuel ratio modulating means controls modulation characteristics at a plurality of different air-fuel ratios in a successively switching manner for each predetermined time by combining the modulation characteristics at the plurality of different air-fuel ratios with each other. COPYRIGHT: (C)2004,JPO