Engine idle speed control apparatus

摘要

An idle speed control apparatus of an engine, having a valve for changing an intake air quality to the engine, a device for measuring an engine coolant temperature, a circuit for detecting an engine speed, and a device responsive to said engine speed for controlling an opening degree of said valve to maintain said engine speed to a predetermined speed under idling state, comprising: a device for producing a signal when said engine coolant temperature exceeds a predetermined temperature; a device responsive to said signal for starting to count a cumulative time period; a device responsive to said cumulative time period for setting a correction opening degree; and a device responsive to said correction opening degree and a current opening degree of said valve means for calculating a learnt opening degree.