In order to improve the superheat control precision of the variable capacity refrigeration system

and establish the simple superheat control method

an intelligent superheat control strategy based on the traditional PID control strategy was proposed

with various influencing factors considered. The actual superheat control effect of the intelligent control strategy was checked in a cold store with constant temperature and humidity

and was compared with the control effect of thermostatic expansion valve. The experimental results show that: the intelligent control strategy gives a better performance such as faster dynamic response

lower overshoot

and shorter oscillation time compared with traditional PID control strategy. It is advantageous to superheat stability

if the compressor frequency changes as the interference factors are inputted in advance. The intelligent control strategy is better than the thermal expansion valve on the superheat control effect

and the cold store cooling time is shortened by 37.14%.