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根据某企业在研的数据,研究基于AMESim软件建立了跨临界CO2汽车空调系统半理论模型。基于汽车行驶中工况条件多变的实际情况,为使制冷性能系数(COP,Coefficient of Performance)达到最大值,先后从热力学、系统性能分析以及优化控制角度进行了研究。根据火用损失分析和性能分析结果,设计了高压侧压力模糊PID控制器。该控制器能够在系统受到环境温度变化的干扰下,迅速控制制冷剂高压侧压力使系统获得最大COP值;与普通PID控制器的效果对比表明,该控制器的调节时间缩短了200 s,超调量下降了约50%,膨胀阀动作幅度也降低了约40%,控制效果得到了很大改善。
According to the data of a company under study, the semi-theoretical model of transcritical CO2 automotive air conditioning system was established based on AMESim software. Based on the fact that the operating conditions of vehicles are changing constantly, in order to maximize the coefficient of performance (COP), a series of studies have been carried out from the aspects of thermodynamics, system performance analysis and optimization control. Based on the analysis of the exergy loss and the result of performance analysis, a high pressure side pressure fuzzy PID controller is designed. The controller can quickly control the pressure of the high-pressure side of the refrigerant to obtain the maximum COP value when the system is disturbed by the change of ambient temperature. Compared with the ordinary PID controller, the control time of the controller is shortened by 200 s The dosage has been reduced by about 50% and the expansion valve has been reduced by about 40%. The control effect has been greatly improved.