控制系统

自动控制，就是在没有人为干预的条件下，使目标的某些物理量准确地按照预期变化

分类

按照有没有反馈测量装置分为闭环系统和开环系统

例如简单的电机转速控制系统根据电压来控制转速，是开环

还分为模拟控制系统和数字控制系统；若保持恒定则为恒值调节系统，若变化则为随动系统。

可用线性微分方程描述的称为线性控制系统，反之为非线性系统。

闭环控制

执行元件 Actuator Device that provides motive power to the process
比较元件 Comparator Computes the difference between the desired and actual output
控制器 Controller Device that computes the control signal. Composed of comparator
and compensator
输出 Output The output of the system to be controlled
设备 Plant Combination of the actuator and the system under control
控制对象 Process System or device, whose output is to be controlled
参考输入 Reference input The desired output of the system. Also called set point or input

传感器 Sensor Device that detects and measures some physical effect and generates a
signal proportional to the effect
传递函数 Transfer function Ratio of the transforms of system output and input. That is,
the transform of the input multiplied by the transfer function is the output in the
transform domain

还有放大元件，校正元件（反馈校正和串联校正）