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      基于單片機和CAN總線的混凝土攪拌站控制系統設計

      作者:admin  來源:原創  2009-3-30  瀏覽:239

       

      隨著混凝土外加劑技術的快速發展,對混凝土攪拌站稱量精度的要求越來越高,因此需要高精度的稱量控制系統,這樣的系統則需要性能更優的模數轉換器件和CPU,需要性能更優的電源供電,需要優良的PCB布線來保證稱量的精度。隨著商業混凝土產業的快速發展,對混凝土攪拌站生產效率的要求越來越高,這就需要提高混凝土攪拌站控制系統處理數據和傳輸數據的速度。本文在混凝土攪拌站控制系統的科研項目中研究了基于單片機和CAN總線的硬件系統的實現方法。首先,本文討論了混凝土攪拌站控制系統目前發展的狀況、需要解決的問題,現場總線技術的發展以及CAN總線的特點,給出了本論文研究的目的和意義,并提出了控制系統的整體改進方案。接下來簡單介紹了混凝土攪拌站控制系統原理、主要組件及其功能。 其次,本文討論了改進后控制系統各個功能模塊的功能、實現的方法、相關的芯片以及芯片的具體應用。特別對稱量系統中的核心部分傳感器、放大器、模數轉換器和CPU進行了詳細的介紹。并介紹了在系統編程技術在本系統設計中的應用,并討論了其優點。接下來對本系統所用到的CAN總線的原理、CAN控制器和CAN高速收發器進行了詳細的介紹,并給出了CAN總線接口的設計方案。最后,本文討論了控制系統中用到的開關量的輸入和輸出電路的設計,并給出了具體的應用電路。接下來從硬件和軟件兩個方面討論了本系統所采用的抗干擾措施。實踐證明,本文所設計的硬件系統不但能夠滿足混凝土攪拌站控制系統性能的要求,而且稱量精度比原來提高了10倍之多,同時數據傳輸速度也有明顯的提高。本系統顯著提高了混凝土攪拌站的工作效率和稱量精度,使其整體性能有了很大的躍升。

      With the rapid development of concrete external reagent technology, the requirement for weighing precision of concrete mixer plant is higher and higher. Therefore analog digital converter and CPU with higher performance is required for designing controlling system. Power supply and PCB (Printed Circuit Board) with higher performance is required for assuring high weighing precision. The increase in commerce concrete industry has created a need for yielding efficiency of concrete mixer plant with higher speed of disposing data and transmitting data. We studied the achieving method of hardware system based on microprocessor and CAN-BUS in the scientific research item of concrete mixer plant controlling system. Firstly, this thesis presented a overview of the state of art in concrete mixer plant controlling system and the problem required to be resolved, and introduced the recent development in field-bus technology and the specifications of CAN-BUS, proposes a novel solution to improve the performance of controlling system. And then, the principles of concrete mixer plant controlling system, primary parts and its function are also introduced in this paper. Secondly, each module’s functions and the meanings for obtaining these functions, the applications of the related chips in the controlling system developed in this paper, especially for critical sensors, amplifier, analog digital converter and CPU, were illustrated in details. And in-system-program technology applied in this controlling system was introduced and its merits were also demonstrated. Then detailed representations for CAN-BUS principle, CAN controller, CAN high-speed transceiver, and design project for CAN-BUS interface were given. Finally, the cue of the design for switching value input and output interface circuits was given, and then a circuit in accordance with the thought of the design produced. Then the capable anti-disturbance measures adopted in hardware and software in this system was discussed. The practice shows that this hardware system designed in this thesis can not only meet the controlling system functions of concrete mixer plant, but also enhance the weighing precision of the concrete mixer plant by 10 times, simultaneously speeding up its data transmission greatly which will bring up a high efficiency. Thanks to these improvements, the overall performance of the concrete mixer plant increased effectively.

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