Arrangement for controlling the air-fuel ratio of an internal combustion engine

摘要

An arrangement for controlling the air-fuel ratio of an internal combustion engine has an emission control system with a three-way catalytic converter for controlling the air-fuel ratio as a function of the operation of the engine. A transitional state sensor detects the opening state of the throttle valve of the engine following an idling sequence. A feedback control loop sets the air-fuel ratio to the stoichiometric ratio. Control circuits are actuated by the output signal of the transitional state sensor for a predetermined period in order to increase the amplification of the feedback control loop, thereby rapidly adjusting the air-fuel ratio to the stoichiometric ratio in the transitional state. <IMAGE>