An idle air control actuator or idle air control valve ( IAC actuator / valve) is a device commonly used in fuel-injected vehicles to control the engine's idling rotational speed ( RPM ). [1] In carburetted vehicles a similar device known as an idle speed control actuator is used. Description The idle speed control mode is used to prevent engine stall during idle. The goal is to allow the engine to idle at as low an RPM as possible yet keep the engine from running rough and stalling when power-consuming accessories, such as air-conditioning compressors and alternators, turn on. The idle air control valve controls the air needed to maintain a steady idle speed. It essentially acts as a bypass of the throttle body plate. The solenoid in an idle air control valve can get PDF | This paper proposes a novel modelling and optimization approach for steady state and transient performance tune-up of an engine at idle speed. In | Find, read and cite all the research An Idle Speed Control Valve is a device to supply auxiliary air to the air intake pipe bypassing a throttle valve. It controls the idle speed to the target speed and stabilizes the engine speed by supplying auxiliary air when the engine is stated. The air conditioner is switched on or the electric load is switched on. The main objective of the idle speed control is to maintain the idling speed at 650rpm and to reject as quickly as possible the extra load exerted on the engine system during idling mode. Comparing the three methods, it shows that PID tuning by ILA produced better results than heuristic tuning and pole placement. .

what is idle speed control