The invention discloses a temperature and
humidity control system and method of a fruit and vegetable fresh-keeping showcase. The
system comprises a master control module, a
signal acquisition module and an actuating mechanism, wherein the
signal acquisition module and the actuating mechanism are connected with the master control module. The
signal acquisition module comprises a temperature sensor and a
humidity sensor. The actuating mechanism comprises a refrigerating unit and a humidifying device. All parts of the
signal acquisition module are connected with the master control module through all channels in a
digital control analog
electronic switch CD4051. Through the temperature and
humidity control system, the two parameters including temperature and humidity of the fruit and vegetable fresh-keeping showcase can be controlled, the environment temperature and the
relative humidity of the fruit and vegetable fresh-keeping showcase can be kept within a set range, and thus the
shelf life for sales of
fruits and vegetables is effectively prolonged, and the commodity value of the
fruits and vegetables is kept. According to the
system, the humidity control quantity is obtained through a
fuzzy PID control calculation method, and thus the
system has the advantages of being high in control accuracy, stability and reliability.