Design and Development of Train Air-conditioning Controller Interface Based on Linux and Qt

Good air-conditioning system is an important reflection of passenger comfort. Traditional air-conditioning controller interface is mostly realized by the combination of PLC(Programmable Logic Controller) and configuration software. However, with the continuous development of urban trains, the requirements of control accuracy, response speed and equipment expansion are constantly improved. Therefore, this paper presents the design and development of train air-conditioning controller interface based on Linux platform and Qt framework. Firstly, the design method and requirements of the interface are determined from the user-centered point of view, and then on this basis the framework of the interface is determined. Secondly, the interface drawing, control association, data refreshing and thread safety which are realized by Qt framework and C++ design pattern are introduced. Thirdly, the PID(Proportion Integral Derivative) control model of air-conditioning controller is established with temperature as input and air-conditioning unit as control object.