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根据过程对象和PLC特点，将常规PI控制与专家控制相结合构成智能PI控制器，并将其应用于电加热炉控制系统中. 实时控制表明，该方法切实可行并具有节能效果.“,”Based on the characteristics of process and PLC，this paper presents an intelligent PI controller composed of general PI controller and expert control. The real-time temperature control result of the electrical furnace shows that the control method is feasible and energy saving.