Idling rotational speed control system for internal combustion engines after cranking

摘要

A system for controlling the idling rotational speed of an internal combustion engine controls a control valve for adjusting the opening area of an intake air passage bypassing a throttle valve after cranking of the engine, by the use of control terms including a differential term which is based on a variation in the engine rotational speed and is set and held at zero before a predetermined time period elapses after completion of cranking of the engine.