What is the working principle of idle speed control valve?

Working principle of idle speed control valve: 1. Idle speed control valve is powered by ignition switch. As long as the ignition switch is turned to the on position, the idle speed control valve will be energized and the engine computer will control its circuit to be grounded. 2. When the working parameters of the engine deviate from the normal value, use this valve to adjust the idle speed. Idle speed is regulated by controlling the amount of air bypassing the throttle body. After the engine is started, the idle control valve is opened for a period of time, and the increase of air intake increases the idle speed of the engine by about150 r \/min-300 r \/min; 3. When the engine coolant temperature is low, the idle speed control valve is opened to obtain a suitable fast idle speed. The engine computer controls the position of the plunger of the idle control valve by changing the signal intensity sent to the idle control valve according to different coolant temperatures.