This study deals with designing a decentralized multi-input multi-output controller board based on a low-cost microcontroller, which drives both parts of variable-speed scroll compressor and electronic-type expansion valve simultaneously in a chiller system. This study aims to show the applicability of commercial low-cost microcontroller to increase the efficiency of the chiller system, having variable-speed scroll compressor and electronic-type expansion valve with a new electronic card. Moreover, the refrigerant system proposed in this study provides the compactness, mobility, and flexibility, and also a decrease in the controller unit’s budget. The study was tested on a chiller system that consists of an air-cooled condenser, a variable-speed scroll compressor, and a stepper driven electronic-type expansion valve. The R134a was used as a refrigerant fluid and its flow was controlled by electronic-type expansion valve in this setup. Both variable-speed scroll compressor and electronic-type expansion valve were driven by the proposed hardware using either proportional integral derivative or fuzzy logic controller, which defines four distinct controller modes. The experimental results show that fuzzy logic controlled electronic-type expansion valve and proportional integral derivative controlled variable-speed scroll compressor mode give more robustness by considering the response time.

中文翻译：

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基于微控制器的分散控制板设计，使用 PID 和模糊逻辑算法驱动冷水机系统

本研究涉及设计基于低成本微控制器的分散式多输入多输出控制器板，该板可同时驱动冷水机系统中的变速涡旋压缩机和电子式膨胀阀。本研究旨在展示商用低成本微控制器在提高冷却系统效率方面的适用性，该系统具有变速涡旋压缩机和带有新电子卡的电子式膨胀阀。此外，本研究中提出的制冷系统提供了紧凑性、移动性和灵活性，并且还减少了控制器单元的预算。该研究在由风冷冷凝器、变速涡旋压缩机和步进驱动电子膨胀阀组成的冷水机组系统上进行了测试。在此设置中，R134a 用作制冷剂流体，其流量由电子式膨胀阀控制。变速涡旋压缩机和电子式膨胀阀均由所提出的硬件驱动，使用比例积分微分或模糊逻辑控制器，定义了四种不同的控制器模式。实验结果表明，模糊逻辑控制的电子式膨胀阀和比例积分微分控制的变速涡旋压缩机模式在考虑响应时间的情况下具有更强的鲁棒性。它定义了四种不同的控制器模式。实验结果表明，模糊逻辑控制的电子式膨胀阀和比例积分微分控制的变速涡旋压缩机模式在考虑响应时间的情况下具有更强的鲁棒性。它定义了四种不同的控制器模式。实验结果表明，模糊逻辑控制的电子式膨胀阀和比例积分微分控制的变速涡旋压缩机模式在考虑响应时间的情况下具有更强的鲁棒性。