本文選題：自由活塞發(fā)動機 + 液壓系統(tǒng)�。� 參考：《吉林大學》2014年碩士論文

【摘要】：隨著國民經(jīng)濟的快速發(fā)展和工業(yè)化進程的加快，社會各領域對動力機械的需求越發(fā)呈現(xiàn)多元化的趨勢。在過去的一百多年里，傳統(tǒng)的往復活塞式內(nèi)燃機由于結構合理、可靠性好、燃料利用率較高而獲得了長足發(fā)展，成為交通運輸、工程機械、海運等各行業(yè)的主要動力裝置。自由活塞發(fā)動機幾乎與傳統(tǒng)內(nèi)燃機同時出現(xiàn)，但是限于當時的工業(yè)技術水平以及控制技術，其在相當長的一段時間內(nèi)并沒有得到長足的發(fā)展。近些年來，由于傳統(tǒng)動力機械消耗了大量的非可再生能源，隨之帶來的環(huán)境污染和能源枯竭問題日益嚴重，結構簡單、能量利用率高的自由活塞發(fā)動機重新獲得人們的重視，掀起了一輪研發(fā)熱潮。 本文結合已經(jīng)開發(fā)完成的自由活塞發(fā)動機樣機，對其液壓控制系統(tǒng)進行了設計研究。首先針對自由活塞發(fā)動機的特點，考慮到活塞位置變化的隨機性和靈活性，提出了活塞位置監(jiān)控和控制的方案，即采用高速直線位移傳感器與觸發(fā)式傳感器相結合的辦法，兩種傳感器聯(lián)動來控制活塞位置，這樣保證了活塞位置控制的可靠性和靈活性。 其次，根據(jù)液壓系統(tǒng)的控制要求，完成了電控單元、傳感器和執(zhí)行器的選型，根據(jù)控制實際，設計制作了液壓控制系統(tǒng)硬件電路，包括電控單元的時鐘、電源、復位電路和存儲器擴展，模擬信號和數(shù)字信號采集模塊、功率驅動模塊、通信模塊等。利用Keil提供的集成開發(fā)環(huán)境，采用C語言編制調(diào)試了控制程序，采用基于模塊化的編程原則，將初始化及各功能模塊的代碼分開編寫調(diào)試，大大縮短了開發(fā)周期和維護成本。 提出了各工況下的控制策略，包括液壓自由活塞發(fā)動機啟動控制、失火判斷等，然后將所開發(fā)的控制系統(tǒng)軟硬件結合自由活塞發(fā)動機進行了發(fā)動機啟動實驗，經(jīng)驗證，控制系統(tǒng)軟硬件基本實現(xiàn)了設計功能，，信號采集準確，功率驅動模塊能滿足負載要求。活塞組件按預定軌跡運動，在啟動壓力和流量足夠的情況下，能夠滿足發(fā)動機正常工作時的需求。
[Abstract]:With the rapid development of national economy and the acceleration of industrialization, the demand for power machinery in various fields of society is becoming more and more diversified. In the past 100 years, the traditional reciprocating piston internal combustion engine has gained great development because of its reasonable structure, good reliability and high fuel utilization ratio. It has become the main power device in transportation, construction machinery, marine transportation and other industries. The free piston engine appeared at the same time as the traditional internal combustion engine, but limited to the level of industrial technology and control technology at that time, it did not make great progress in a long period of time. In recent years, due to the large amount of non-renewable energy consumed by traditional power machinery, the problems of environmental pollution and energy depletion are becoming more and more serious, and the free piston engine with simple structure and high energy efficiency has been paid more and more attention. Set off a round of research and development boom. In this paper, the hydraulic control system of the free piston engine has been designed and studied. According to the characteristics of free piston engine and considering the randomness and flexibility of piston position change, the scheme of piston position monitoring and control is put forward, that is, the method of combining high speed linear displacement sensor with trigger sensor is proposed. The piston position is controlled by two sensors, which ensures the reliability and flexibility of piston position control. Secondly, according to the control requirements of the hydraulic system, the selection of the electronic control unit, sensor and actuator is completed. According to the control practice, the hardware circuit of the hydraulic control system is designed and manufactured, including the clock and power supply of the electronic control unit. Reset circuit and memory expansion, analog signal and digital signal acquisition module, power drive module, communication module and so on. By using the integrated development environment provided by Keil, the control program is programmed and debugged by C language, and the code of initialization and each functional module is written and debugged separately, which greatly shortens the development cycle and maintenance cost. The control strategies under various working conditions are put forward, including the starting control of hydraulic free piston engine, the judgment of misfire, etc. Then, the software and hardware of the developed control system are combined with the free piston engine to carry out the engine start-up experiment, which has been verified. The hardware and software of the control system basically realize the design function, the signal collection is accurate, the power drive module can meet the load requirement. The piston assembly moves according to the predetermined trajectory and can meet the requirements of the engine when the starting pressure and flow rate are sufficient.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TK403;TH137

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