Control system for internal combustion engines fitted with catalytic converter accelerates rate of rise of converter during starting

摘要

Immediately the motor is started a converter temperature rise acceleration system initiates an increase in the volume of intake air and retardation of the ignition retarded to set the engine revolutions at a reference value by controlling intake air and ignition timing control systems. The air/fuel ratio is adjusted by a lean mixture control system to a lean level with reference to the stoichiometric ratio . This adjustment is suppressed when the degree of ignition retardation is less than a specific value