【摘要】：微量計量泵在工廠工藝過程控制有著廣泛的應用，隨著控制技術及數(shù)字信息技術的不斷發(fā)展，工廠自動化技術日益更新，對計量泵的精確度和穩(wěn)定性的要求不斷提高。國內微量計量泵研究相對于國外投入少、起步晚，微量計量泵結構和控制上都比較落后于國外。國內微量計量泵控制效果有時難以滿足復雜的工廠工藝生產要求，需要從結構和控制策略上改進，使其具有較高控制精度和較好的穩(wěn)定性。 本課題從控制策略上對微量計量泵控制系統(tǒng)進行研究和改進，對微量計量泵閉環(huán)控制算法及硬件電路和軟件系統(tǒng)進行深入研究。以下是本課題主要研究內容： 首先，對國內外微量計量泵系統(tǒng)研究的基本情況進行分析介紹，分析了微量計量泵系統(tǒng)閉環(huán)和半閉環(huán)兩種控制方案各自優(yōu)缺點。由于微量計量泵流量有脈動現(xiàn)象不利于實現(xiàn)流量反饋的全閉環(huán)，因此本文采用半閉環(huán)控制方案，接著詳細介紹了微量計量泵的驅動源步進電機的特點、驅動方式、控制策略。由于其模型存在非線性、滯后性、復雜性等問題，采用模糊PID實現(xiàn)微量計量泵的閉環(huán)控制。 其次，在硬件方面設計了以DSP2812為主控芯片的硬件電路：外擴數(shù)據(jù)存儲電路、LCD12864顯示電路、按鍵電路、報警電路等外設模塊。軟件上采用CCS3.3集成開發(fā)軟件編寫程序，利用DSP的SCI接口與上位機通信。系統(tǒng)接受來自上位機發(fā)送的流量控制信號，并通過流量控制器轉化為步進電機所需的頻率值，利用DSP的PWM模塊產生頻率可調的PWM信號送給步進電機驅動器，從而驅動微量計量泵運轉。利用DSP的正交編碼接口測出步進電機的轉速反饋給控制系統(tǒng)，系統(tǒng)調用模糊PID控制算法，，實現(xiàn)微量計量泵流量的精確計量。軟件上主要包括主程序、初始化程序、LCD12864顯示程序、編碼器反饋程序、閉環(huán)算法控制程序、以及通信中斷服務程序等。 最后，通過RS-232接口將系統(tǒng)與上位機實現(xiàn)通信，并利用VC++6.0進行人機交互監(jiān)控界面設計，實現(xiàn)上位機和下位機之間數(shù)據(jù)的交互和顯示。
[Abstract]:Micro metering pump is widely used in plant process control. With the development of control technology and digital information technology, the automation technology of factory is updated day by day, and the requirement of accuracy and stability of metering pump is improved. Compared with foreign countries, the research on micro metering pumps in China is less and starts late. The structure and control of micro metering pumps lag behind those of foreign countries. The control effect of domestic micro metering pump is sometimes difficult to meet the complex production requirements of the factory process. It is necessary to improve the structure and control strategy to make it have higher control precision and better stability. In this paper, the control system of micro metering pump is studied and improved from the control strategy, and the closed loop control algorithm, hardware circuit and software system of micro metering pump are studied deeply. The following is the main contents of this paper: firstly, the basic research situation of micro metering pump system at home and abroad is analyzed, and the advantages and disadvantages of closed loop and semi closed loop control schemes are analyzed. Because the flow pulsation of micro metering pump is not conducive to the full closed loop of flow feedback, this paper adopts a semi closed loop control scheme, and then introduces in detail the characteristics, driving mode and control strategy of stepper motor driven by micro metering pump. Due to the nonlinear, lag and complexity of the model, the closed loop control of micro metering pump is realized by fuzzy PID. Secondly, in the aspect of hardware, the hardware circuit based on DSP2812 is designed, such as LCD12864 display circuit, keystroke circuit, alarm circuit and so on. The software uses CCS3.3 integrated development software to write the program, and uses the SCI interface of DSP to communicate with the host computer. The system receives the flow control signal from the upper computer and converts the frequency value of the stepping motor into the frequency value of the step motor through the flow controller. The system generates the frequency adjustable PWM signal to the stepping motor driver by using the PWM module of DSP. Thus driving the operation of micro metering pump. Using the orthogonal coding interface of DSP to measure the speed feedback of stepping motor to the control system, the fuzzy PID control algorithm is called in the system to realize the accurate measurement of the flow rate of the micro metering pump. The software mainly includes main program, initialization program LCD12864 display program, encoder feedback program, closed-loop algorithm control program, and communication interrupt service program. Finally, the communication between the system and the host computer is realized through the RS-232 interface, and the man-machine interactive monitoring interface is designed by using VC 6.0 to realize the data exchange and display between the upper computer and the lower computer.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TP273

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