Research On Intelligence Control In Central Air-conditioner Variety-flux Saving-energy Control System

Variety-flux energy control system is introduced in my thesis for kinds of central air-conditioners. For better control results, intelligence control is used in this system. This system related to check the temperature and the pressure in water cycle system. The variables are calculated by fussy-PID arithmetic, then is turned 0～20mA current signal to control transducer. This system include three saving-energy system that is freezing-water circle system, cooling-water circle system and cooling-tower wind engine. These systems are controlled by RS-485 interface.There are great non-linearity, lag and variety of parameter in this system. Traditional PID control arithmetic has some difficulty. The merit of fussy-control is that there is better dynamic response characteristic. The mathematic model is not needed in this arithmetic. There is better adaptability, faster rise time and better robust characteristic. But there is error in fussy-control by limited grade. So we use fussy-PID arithmetic in this system. It ensures that there is faster, more stability and smaller error.This control system has been proved stable by some experiment, the anti-interference ability is strong. It can satisfy completely the need of variable-flux equip, has vast of market foreground.