Design of Intelligent Control System in Process of Tobacco Flue Curing

A new intelligent control system for flue curing of tobacco leaf was designed according to the rule of temperature humidity change in the process of curing.PIC16F877 was adopted as a core of the control system,SHT11 temperature humidity sensor was used to collect the data of temperature humidity,the man-machine dialogue unit was composed of keyboard and LCD display screen,RS232 was the interface of serial communication,and the intelligent control system also included alarm circuit,watchdog circuit and the executive mechanism of heating and exhausting.The system adopted fuzzy control algorithm because of the remarkable time delay and nonlinear characteristic of temperature humidity control,and the system programming was also presented.The practical operation showed that the system ran steadily,featured good control performance,could regulate the temperature humidity in barn automatically,and was convenient in operation and low in labor intensity.Comparing with conventional curing barn,the automatic control system increased the proportion of middle and high grade leaf by 10 percentage points,while the proportion of leaf not up to the standard reduced by over 4 percentage points.