Design And Study Of The Central Air-conditioning Control System Based On Transducer And Modbus Network

The thesis is based on a real project about central air-conditioner, do a further research on the fuzzy control in this field.At present, the familiar way to control central air-conditioner is to use valve. Using valve can make a change to flux, but it will waste a great deal of energy.These to more and more transducer have been applied in pump,it can save a lot of electricity. So The apply of transducer to central air-condition is a significative task.The study begin with the analysis of theory about central air-conditioner. We find that difference in temperature can reflect the cooling load more exactly,so it should be the basis of control. Because of having no possibility to build a exact mathematics model, so Fuzzy control is more suitable to this field. Through building query table we can connect difference in temperature to entironment element. Then begin the study of Modbus protocol, design a intelligent sensor to realize the remote communications.In the end we design the control system against central air-conditioner, introduce hardware structure and the function of every part of this system.It realize the control of transducer power by digital signal.Then introduce how to design the control interface of touch panel.This control has a strongpoint of being flexible, easy toupgrade.And a better control effect need further study.