【摘要】：能源危機(jī)和環(huán)境污染導(dǎo)致了對發(fā)動機(jī)動力性、經(jīng)濟(jì)性和排放性的要求日益嚴(yán)格，新型發(fā)動機(jī)的研制成為內(nèi)燃機(jī)研究的重點(diǎn)課題。對置活塞二沖程柴油機(jī)正是在這種背景下提出的一種新型動力裝置，它具有高功率密度、平衡性好、噪聲低、燃料適應(yīng)性強(qiáng)和高度柔性布置等優(yōu)勢。本文所研究的對置活塞二沖程柴油機(jī)采用高壓共軌燃油系統(tǒng)，高壓共軌系統(tǒng)不僅可以實(shí)現(xiàn)每缸的兩個噴油器噴油量、噴油正時的精確控制，還可以實(shí)現(xiàn)噴油壓力和噴油率的靈活控制。 本文研究了運(yùn)用基于模型的狀態(tài)反饋控制器設(shè)計(jì)方法，闡述了非線性模型線性化的四種方法并進(jìn)行了比較；研究了將線性化的狀態(tài)空間模型進(jìn)行狀態(tài)反饋控制器設(shè)計(jì)的方法，將此方法應(yīng)用于對置活塞二沖程柴油機(jī)的控制策略研究。 綜合考慮了對置活塞二沖程柴油機(jī)起動快速、平順、可靠的控制要求，本文建立了面向最優(yōu)控制算法設(shè)計(jì)的狀態(tài)空間模型，分別應(yīng)用Bang-Bang以及LQR控制算法設(shè)計(jì)了發(fā)動機(jī)的起動控制策略，通過Matlab/Simulink進(jìn)行了仿真，，分別驗(yàn)證了兩種控制算法的控制效果，結(jié)合兩種控制算法各自的優(yōu)勢，最終得到對置活塞二沖程柴油機(jī)的最優(yōu)起動過程控制策略，并在對置活塞二沖程柴油機(jī)上進(jìn)行了臺架試驗(yàn)驗(yàn)證。 本文研究了對置活塞二沖程柴油機(jī)共軌系統(tǒng)的特點(diǎn)及工作原理，依據(jù)液體的體積彈性模量理論，將腔體內(nèi)的燃油作為研究對象，結(jié)合發(fā)動機(jī)實(shí)際的共軌系統(tǒng)參數(shù)，分別建立了高壓泵、共軌及噴油器腔體內(nèi)的燃油壓力數(shù)學(xué)子模型，依據(jù)其工作原理，最終獲得對置活塞二沖程柴油機(jī)共軌系統(tǒng)的數(shù)學(xué)模型。運(yùn)用LPV系統(tǒng)線性化理論，得到系統(tǒng)的狀態(tài)空間模型，同時，應(yīng)用狀態(tài)反饋控制器設(shè)計(jì)方法，得到對置活塞二沖程柴油機(jī)軌壓最優(yōu)控制算法，獲得的最優(yōu)控制算法得到仿真與對置活塞二沖程柴油機(jī)臺架試驗(yàn)驗(yàn)證。
[Abstract]:Energy crisis and environmental pollution have led to the increasingly stringent requirements for engine power, economy and emissions. The development of new engines has become a key issue in the research of internal combustion engines. It is under this background that a new type of power device is put forward, which has the advantages of high power density, good balance, low noise, strong fuel adaptability and highly flexible arrangement. In this paper, the contrasting piston two-stroke diesel engine adopts high-pressure common-rail fuel system. The high-pressure common-rail system can not only realize the accurate control of the injection quantity and injection timing of two injectors per cylinder. The flexible control of injection pressure and injection rate can also be realized. In this paper, the design method of state feedback controller based on model is studied, and four methods of linearization of nonlinear model are discussed and compared. The design method of state feedback controller based on linearized state space model is studied. The method is applied to study the control strategy of two stroke diesel engine with opposite piston. Considering the requirements of fast, smooth and reliable starting for a two-stroke diesel engine with contrasting piston, a state-space model for optimal control algorithm design is established in this paper. The engine start control strategy is designed by using Bang-Bang and LQR control algorithms respectively. The simulation results of the two control algorithms are carried out by Matlab/Simulink. The control effects of the two control algorithms are verified, and the respective advantages of the two control algorithms are combined. Finally, the optimal starting process control strategy of the two stroke diesel engine with opposite piston is obtained, and the bench test is carried out on the two stroke diesel engine with opposite piston. In this paper, the characteristics and working principle of the common rail system of a two-stroke diesel engine with opposite piston are studied. According to the theory of volume elastic modulus of liquid, the fuel oil in the cavity is taken as the research object, and the parameters of the common rail system of the engine are combined with the actual parameters of the common rail system. The mathematical models of fuel pressure in high pressure pump, common rail and injector cavity are established respectively. According to its working principle, the mathematical model of common rail system of two stroke diesel engine with opposite piston is obtained. By using the linearization theory of LPV system, the state space model of the system is obtained. At the same time, the optimal control algorithm for rail pressure of a two-stroke diesel engine with opposite piston is obtained by using the design method of state feedback controller. The obtained optimal control algorithm is verified by simulation and bench test of two stroke diesel engine with opposite piston.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK423

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本文編號：2401064