本文選題：自由活塞發(fā)動(dòng)機(jī) + 液壓系統(tǒng)��； 參考：《吉林大學(xué)》2014年碩士論文

【摘要】：隨著國(guó)民經(jīng)濟(jì)的快速發(fā)展和工業(yè)化進(jìn)程的加快，社會(huì)各領(lǐng)域?qū)?dòng)力機(jī)械的需求越發(fā)呈現(xiàn)多元化的趨勢(shì)。在過(guò)去的一百多年里，傳統(tǒng)的往復(fù)活塞式內(nèi)燃機(jī)由于結(jié)構(gòu)合理、可靠性好、燃料利用率較高而獲得了長(zhǎng)足發(fā)展，成為交通運(yùn)輸、工程機(jī)械、海運(yùn)等各行業(yè)的主要?jiǎng)恿ρb置。自由活塞發(fā)動(dòng)機(jī)幾乎與傳統(tǒng)內(nèi)燃機(jī)同時(shí)出現(xiàn)，但是限于當(dāng)時(shí)的工業(yè)技術(shù)水平以及控制技術(shù)，其在相當(dāng)長(zhǎng)的一段時(shí)間內(nèi)并沒(méi)有得到長(zhǎng)足的發(fā)展。近些年來(lái)，由于傳統(tǒng)動(dòng)力機(jī)械消耗了大量的非可再生能源，隨之帶來(lái)的環(huán)境污染和能源枯竭問(wèn)題日益嚴(yán)重，結(jié)構(gòu)簡(jiǎn)單、能量利用率高的自由活塞發(fā)動(dòng)機(jī)重新獲得人們的重視，掀起了一輪研發(fā)熱潮。 本文結(jié)合已經(jīng)開(kāi)發(fā)完成的自由活塞發(fā)動(dòng)機(jī)樣機(jī)，對(duì)其液壓控制系統(tǒng)進(jìn)行了設(shè)計(jì)研究。首先針對(duì)自由活塞發(fā)動(dòng)機(jī)的特點(diǎn)，考慮到活塞位置變化的隨機(jī)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(jié)合的辦法，兩種傳感器聯(lián)動(dòng)來(lái)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(shí)際，設(shè)計(jì)制作了液壓控制系統(tǒng)硬件電路，包括電控單元的時(shí)鐘、電源、復(fù)位電路和存儲(chǔ)器擴(kuò)展，模擬信號(hào)和數(shù)字信號(hào)采集模塊、功率驅(qū)動(dòng)模塊、通信模塊等。利用Keil提供的集成開(kāi)發(fā)環(huán)境，采用C語(yǔ)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(kāi)編寫(xiě)調(diào)試，大大縮短了開(kāi)發(fā)周期和維護(hù)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(dòng)機(jī)啟動(dòng)控制、失火判斷等，然后將所開(kāi)發(fā)的控制系統(tǒng)軟硬件結(jié)合自由活塞發(fā)動(dòng)機(jī)進(jìn)行了發(fā)動(dòng)機(jī)啟動(dòng)實(shí)驗(yàn)，經(jīng)驗(yàn)證，控制系統(tǒng)軟硬件基本實(shí)現(xiàn)了設(shè)計(jì)功能，，信號(hào)采集準(zhǔn)確，功率驅(qū)動(dòng)模塊能滿足負(fù)載要求�；钊M件按預(yù)定軌跡運(yùn)動(dòng)，在啟動(dòng)壓力和流量足夠的情況下，能夠滿足發(fā)動(dòng)機(jī)正常工作時(shí)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(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TK403;TH137

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