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The North American controller feeds back part or all of the control system's output to the input end via specific methods and devices, compares the feedback information with the original input information, and applies the comparison result to the system for control to prevent deviation from the predetermined target. Closed-loop control systems utilize negative feedback. This is an automatic control system formed by a closed loop consisting of a forward signal path and a feedback path, also known as a feedback control system. Closed-loop control systems have the following characteristics in control: since the feedback amount of the output signal is compared with the input