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What is the working principle of the idle control valve?

1 Answers

HoldenLynn

07/30/25 6:34am

Working principle of the idle control valve: The idle control valve is powered by the ignition switch. As long as the ignition switch is turned to the ON position, the idle control valve is energized, and the engine computer controls its circuit grounding. When the engine's operating parameters deviate from normal values, this valve is used to adjust the idle speed. The idle speed is adjusted by controlling the amount of air bypassing the throttle body. After the engine starts, the idle control valve opens for a period of time to increase the air intake, raising the engine idle speed by approximately 150r/min to 300r/min. Additional information: 1. When the engine coolant temperature is low, the idle control valve opens to achieve an appropriate fast idle. The engine computer controls the position of the idle control valve plunger by varying the signal strength sent to the idle control valve based on different coolant temperatures. The stepper motor-type idle control valve is currently the most widely used idle control device in the world. It adjusts the opening of the bypass air passage in the automotive electronic fuel injection system, thereby regulating the bypass air volume to achieve the desired target engine speed. 2. Structural principle: It consists of a rotor made of permanent magnets, a stator composed of excitation coils, and components such as a feed screw that converts rotational motion into linear motion and a valve. It uses the step signal provided by the system for conversion control, allowing the rotor to rotate forward or reverse, thereby enabling the valve core (screw) to extend or retract to adjust the cross-section of the bypass air passage, stabilizing the idle speed and achieving the ideal idle speed.

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