Pharmaceutical Plant Temperature And Humidity Intelligent Control System Design And Research

On the basis of analyzing the control requirement and the inside problems of the air conditioner system in the solid oral preparation workshop (it is called The Solid Workshop for short below), the thesis has established a general design scheme of temperature & humidity control system. The scheme adopts the PLC control technique to achieve the requirement, and realizing the remote monitoring and central managements by two layers distributed computer monitor system. In considering of so many temperature and humidity spots need to be tested in the Solid Workshop, the scheme propose the way in using digital temperature & humidity sensor LTM-8901 with "ITU BUS" technology to improve the reliability during the data transmission and lower the cost in the system transformation.Since the temperature and humidity control system in The Solid Workshop has the characteristics of large inertia, large delay, and uncertain parameter, the utilization of the fuzzy-PID arithmetic and the predictive compensation arithmetic in the temperature control system is mainly researched in the thesis. The results by simulation research indicate that the fuzzy-PID controller with predictive model designed has better dynamics & stable state performance and even stronger robustness when the systematic parameter changes. Since it is not necessary for the high precision in humidity control, PWM is adopted, thus the original dehumidified equipment can be thoroughly used.The control system software is designed into two parts which are the PC monitor software and the PLC control programs, by using King View 6.5 configuration software and Step7-Micro/ WIN32 V3.2 program designing software separately. The PC monitor software consists of multi-interfaces. It can monitor the operating states of the air conditioner system in real time, and set every parameter conveniently.