组成：是由被控对象和自动控制装置按一定方式联结起来的，以完成某种自动控制任务的有机整体。Composition: It is an organic whole formed by connecting the controlled plant and the automatic control device in a specific manner to accomplish certain automatic control tasks.
分类：开环控制、闭环控制、复合控制Classification : Open-Loop Control, Closed-Loop Control, Compound Control
开环控制：只有输入量的前向控制作用，输出量并不反馈回来影响输入量的控制作用Open-Loop Control:Only the input exerts a forward control action, and the output is not fed back to influence the control action.
闭环控制：把输出量检测出来，经过物理量的转换，再反馈到输入端 Closed-loop control: The output is detected, undergoes physical conversion, and is then fed back to the input.
要求：稳定性、快速性、准确性Requirements: stability, speed, accuracy
