Idle speed control of the idle speed control system composition

The composition of the engine idle control system, as shown in the figure, consists of a variety of sensors, signal control switches, electronic control unit ECU, idle control valve and throttle bypass airway, etc. The ECU receives the signals from the relevant sensors, and after analyzing and judging them, it sends out the corresponding commands to the idle control valve (ISCV), which then controls the air flow in the throttle bypass, so that the engine idles at an optimal speed. The engine idle speed is always at the optimal speed.