Idle Speed Control

Idle Speed Control refers to a component or system that is used to regulate the idle speed of an engine. It is classified under the supply class Miscellaneous Engine Accessories, Nonaircraft, which falls under the supply group Engine Accessories.

The Idle Speed Control is responsible for maintaining the engine's idle speed within a specific range, ensuring smooth operation and preventing stalling. It achieves this by adjusting the amount of air or fuel entering the engine during idle conditions.

There are various types of Idle Speed Control systems available, including:

1. Idle Air Control Valve (IACV): This valve controls the amount of air bypassing the throttle plate when the throttle is closed. It adjusts the idle speed by regulating the airflow to the engine.

2. Idle Speed Control Motor (ISC): This motor is connected to the throttle body and adjusts the throttle plate position to control the idle speed. It receives signals from the engine control unit (ECU) to make precise adjustments.

3. Electronic Throttle Control (ETC): In modern vehicles with electronic throttle control, the ECU directly controls the throttle plate position to regulate the idle speed. It uses various sensors to monitor engine conditions and adjust the throttle accordingly.

4. Idle Speed Control Solenoid: This solenoid is responsible for controlling the flow of fuel to the engine during idle conditions. It opens or closes to adjust the fuel flow and maintain the desired idle speed.

These Idle Speed Control systems are essential for proper engine operation, especially during idle conditions. They help maintain a stable idle speed, improve fuel efficiency, and reduce emissions.