What is the function of an idle motor in a car?

[DeCassandra]

The function of an idle motor in a car: It is used to manage the car's idle speed, with the purpose of adjusting the idle speed according to the engine load during idling. The idle stepper motor is mounted on the throttle body and is controlled by the engine control unit to regulate the engine's idle speed. When the engine speed deviates from idle, it is adjusted by the throttle valve, which controls the amount of air entering the intake manifold and is mechanically operated by the accelerator pedal cable. The throttle body has a bypass air passage that supplies air during engine idling (when the throttle valve is closed). The pivot of the automatic idle motor extends into the bypass air passage, regulating the air flow. The engine control unit uses input signals from various sensors to move the pivot of the automatic idle motor in and out of the bypass air passage to adjust the engine's idle speed. When the ignition key is turned to the 'on' position, the automatic idle motor begins operation. This switch signal is input to the ECU to determine whether the engine is in an idle state. Simultaneously, the motor's current position is fed back to the ECU by the motor position sensor.