Idling speed control system of internal combustion engine

摘要

An idling speed control system is provided in an internal combustion engine which has an intake passage led to cylinders of the engine, a throttle valve installed in the intake passage, a bypass passage bypassing the throttle valve and an air-flow controller installed in the bypass passage for controlling the amount of air flowing in the bypass passage. The system comprises a first device which detects an engine torque which causes a fluctuation of rotation speed of the engine; and a second device which controls the air-flow controller in accordance with the detected engine torque.