FEEDBACK AIR-FUEL RATIO CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE CAPABLE OF PROVIDING CONSTANT ROL SIGNAL AT START OF FUEL FEED

摘要

In a feedback control system for maintaining the air fuel ratio of a combustible mixture fed to an internal combustion engine at a preset ratio based on a feedback signal representing the concentration of a certain component of the exhaust gas, a control signal producing circuit is provided with a sub-system for holding the control signal constantly at a preset level for a predetermined amount of time immediately after the star-t of the fuel feed to the engine in order to prevent an unintentional lowering of the airfuel ratio due to a delay in the development of the feedback signal from the start of the fuel feed.