AIR-FUEL RATIO CONTROLLER OF LEAN-BURN GASOLINE SUPERCHARGED INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To compensate for the amount of torque reduced as air-fuel ratio is suddenly made leaner by a sudden rise in air density so as to prevent torque from being dropped by providing a bypass control means for controlling a switching valve so that the valve being opened is closed when a supercharged state detecting means detects engine operation in which supercharging is substantially carried out. CONSTITUTION:A supercharged state detecting means D detectes an engine state in which supercharging is carried out substantially by a supercharger A. An air-fuel ratio control means E sets air-fuel ratio to one leaner than theoritical air-fuel ratio, which air-fuel ratio is obtained from an engine when the supercharged state detecting means D detects engine operation in which supercharging is substantially carried out. A bypass control means F controls a switching valve C when the supercharged state detecting means D detects engine operation in which supercharging is substantially carried out, so that the switching valve C being opened is closed.