Along with the continuous renewal and development of computer hardware ,computer operating system is widely applied to the engineering fields , in which , intelligent control is one of the most commonly used intelligent control sys-tems .By using PID closed-loop control algorithm , an improvement of the PID algorithm reduced the system ’ s delay time of response , and increased the system ’ s sensitivity .As to the acquisition process for the external parameters ,by using the way of programming , it realizes the automatic control on the parameter acquisition process .In order to verify the va-lidity of the mathematical model and the algorithm ,it took the greenhouse network design as an example to verify the pro-cedure and the algorithm .Through calculation ,it was found that in the condition of the same sample input , the result is less different between the motor output and the fitting values of closed -loop PLC system of is small , and the maximum is 0 .2%, which achieved the control requirements .And the minimum packet loss rate is only 0 .4%, which meets the pre-cision of computer data transmission , and provides a theoretical reference for the study of intelligent control system in greenhouse .%随着计算机硬件设备的不断更新和发展，计算机智能操作系统被广泛地应用到工程领域，其中PLC智能控制是最常用的智能控制系统之一。运用PID闭环控制算法，通过对 PID 算法的改进，降低了系统反应动作的延时时间，增大了系统的灵敏度。对于外部参数的采集过程，采用编程方式对参数采集过程实现了自动控制。为了验证设计的数学模型和算法的有效性，以日光温室物联网设计为例，对程序和算法进行了验证。通过计算发现：在相同样本输入的情况下，电机输出值和闭环PLC 系统的拟合值的结果相差不大，最大仅为0．2％，达到了控制要求。其中，丢包率最低仅为0．4％，符合计算机数据传输的精确性要求，为日光温室智能控制系统的研究提供了理论参考。
展开▼
