Usually for the control of analog quantities,a controller determines an output quantity according to an input quantity,according to certain rules and algorithms,so that the input and output form a control loop.The control loop has the distinction of open loop and closed loop.The open-loop control loop means that the output is determined according to a reference quantity,and there is no direct relationship between the input and the output quantity.The closed-loop loop feeds back the output of the control loop as the input of the loop,and compares it with the set value of the quantity or the output value that should be.Closed-loop control,also known as feedback control,is the most common control method in control systems.Several conventional feedback control modes are introduced below.
通常是针对模拟量的控制来说,一个控制器根据一个输入量,按照一定的规则和算法来决定一个输出量,这样,输入和输出就形成一个控制回路。控制回路有开环和闭环的区别。开环控制回路,指输出是根据一个参考量而定,输入和输出量没有直接的关系。而闭环回路则将控制回路的输出再反馈回来作为回路的输入,与该量的设定值或应该的输出值作比较。闭环回路控制又叫反馈控制,是控制系统中最常见的控制方式。下面介绍几种常规的反馈控制的模式。
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