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八、特殊规律的DDC控制系统上述典型控制系统是生产中最常见的,其中的计算机起着一台或数台调节器及计算单元(+、-、×、÷)的作用。但是工业控制机的功能远远不止如此,在许多方面它将进一步发挥作用。 (一)大纯迟后调节系统 DDC调节系统的采样周期选择大致等于纯迟后时间,虽有利于改善系统的调节品质,但在工况变化较快的场合,采样周期过大,系统跟踪干扰的能力较差,调节不够及时。因此,需按模拟系统纯迟后补偿的方法来组成系统。DDC纯迟后补偿系统的结构见图44。
Eight, the special rules of the DDC control system The typical control system is the most common production, in which the computer plays one or several regulators and computing units (+, -, ×, ÷) role. But the function of the industrial control machine is far more than that, and in many ways it will play a further role. (A) big pure late adjustment system DDC adjustment system sampling period is approximately equal to the purely late time, although it helps to improve the quality of the system adjustment, but in the case of fast changes in conditions, the sampling period is too large, the system tracking interference Poor ability to adjust timely enough. Therefore, it is necessary to make up the system according to the method of compensating the late delay of analog system. The structure of the DDC system is shown in Figure 44.