摘要:近年来，随着市场经济的不断发展、现代物流系统的不断完善，食品冷藏链的产业化发展前景十分广阔。毫无疑问，冷库为我们的日常生活带来了方便。然而我国食品专用冷库严重的不足，食品的冷藏链的不完善，加之食品经营管理的各种因素，每年约有3000万吨水果、蔬菜、乳制品和其他易腐食品有待于从变质中拯救出来，易腐食品每年要损失十多亿元。当务之急，我们要提高冷库整体的自动化管理水平，加强管理，降低运营成本，促进冷库向安全、规范、节能、环保结构简单、操作方便的方向发展。为此，我们应对国内大多数冷库的温度控制方法进行改进，提高自动化程度，因此对冷库的控制系统研究十分有必要。

　　　本文对冷库制冷系统的组成进行了概述。通过系统框图介绍了冷库制冷系统的原理。用MATLAB对冷库自动控制的稳定性进行分析。在电路控制系统中，本文用最简单的PLC控制代替了老式的继电器控制，从而让整个控制系统得以稳定的操作和运行，进而实现无人操作的便捷。由此可见，PLC在冷库系统中的应用具有很大的前景。

关键词：冷库；制冷系统；PLC 

Abstract:In recent years, with the development of market economy, modern logistics system perfect, the food of the industrialization of the refrigeration chain development prospect. No doubt, the cold storage for our daily life brought the convenience. But China's food special cold storage serious shortage of food, the refrigeration chain is not perfect, together with the food of the operation and management of the various factors, each year about 30 million tons of fruit, vegetables, and dairy products and other perishable food needs to be saved from metamorphic, perishable food each year to more than 10 $one hundred million loss . Top priority, we want to improve the management level of the whole of the cold storage automation, strengthen management, lower operating costs, promote the cold storage to security, standard, the energy conservation, the environmental protection of simple structure, convenient operation direction. For this reason, we to cope with domestic most cold storage temperature control method was improved, increased automation, so the cold storage structure control system study is very necessary

　　　　In this paper, the cold storage refrigeration system composition are summarized. Through the system frame introduces the principle of the cold storage refrigeration system. Use of MATLAB cold storage automatic control stability analysis. In a circuit control system, this paper with the most simple PLC control instead of the old the relay control, so that the whole control system to stable operation and operation, then realizing unattended operation is convenient. Thus, the application of PLC in the cold storage system has a great future. 

Key words： Cold storage ；Refrigeration system； PLC