基于FX2N-48MT的汽车空调控制系统研究

研究了一种以三菱FX2N系列PLC为核心的空调控制器,该控制器以空调开关、新鲜空气温度、蒸发箱表面温度、空调管路压力、发动机水温为控制条件,并配合继电器控制PLC的输入,通过PLC控制压缩机电磁离合器的吸合。该控制系统的特点是平均无故障时间长,接线方便,而且还可以随时根据需要更改输入电压。

An auto ac controller which takes FX2N serial PLC as the core chip is researched.The control conditions are ac switch,fresh air temperature,evaporator surface temperature,ac line pressure and engine cooling water temperature.Take these conditions work with relay as the PLC input signal.Then the output signal controls the compressor electromagnetism clutch.The characters of the control system are long MTBF(mean time between failures),convenient connection,and could change input voltage according to requirement.