雙燃料發(fā)動(dòng)機(jī)LNG供給系統(tǒng)參數(shù)優(yōu)化及其工作特性的仿真分析
[Abstract]:Natural gas, with its huge reserves, will become an important alternative fuel for engines in the 21st century. At present, the application of natural gas in the field of engine is mostly in the form of gas, the gas filling efficiency is low, the structure arrangement is complex, and the possibility of detonation is high. Liquid direct injection in LNG cylinder can not only solve this kind of problem very well. It is also beneficial to lean combustion, releasing a large amount of cold energy during combustion and improving the emission performance of the engine significantly. At present, it is still in the stage of theoretical research. The development of the corresponding LNG fuel supply system is the difficult point to realize the theory. Among the existing in-cylinder direct injection fuel supply, the high-pressure common rail system, with its incomparable advantages, such as extremely high injection pressure and flexible control strategy, has left a huge space for the improvement of engine performance. The high pressure common rail system has the problem of high pressure fluctuation in the application of multi-cylinder engine. Reducing the rail pressure fluctuation is one of the important development directions of the high-pressure common rail system at present. The main purpose of this paper is to optimize the LNG electronically controlled common rail fuel supply system for a medium-speed diesel / LNG dual-fuel engine, and to solve the problems of the wide range of orbital pressure wave momentum and the long time to establish the target rail pressure. Improve the control accuracy of the whole system. In order to control the rail pressure fluctuation, the parameter optimization of a medium-speed diesel / LNG dual-fuel engine LNG electronically controlled common-rail fuel supply system is presented in this paper. According to the principle structure of high pressure pump, common rail tube and injector in the fuel supply system, the AMESim software is used to model the LNG electronically controlled common rail fuel supply system and modify the model of the original system. The influence of the key parameters of the high-pressure pump on the fuel supply characteristics and the pressure variation in the common rail tube are calculated and analyzed. At the same time, a matching electronic control unit (ECU).) is designed for the diesel / LNG dual fuel engine. The control strategy and algorithm of LNG- diesel dual fuel engine fuel injection system ECU are determined, and the control strategy is simulated in the simulation software. The influence of different control parameters on rail pressure is analyzed, and the control precision of the whole high pressure common rail system is improved. Through comparison and analysis, this paper draws the following conclusions: first, the change of fuel supply phase has more obvious influence on the fluctuating phase of rail pressure, in which the initial position of oil supply is 5 degrees, and the fluctuation range of rail pressure is small at 65 degrees. However, the phase of oil supply has little effect on the fuel supply characteristics. Secondly, plunger lift and plunger diameter have great influence on rail pressure fluctuation and oil supply characteristics. Thirdly, the mass of the outlet valve should choose the appropriate size, too large and too small will cause the rail pressure wave momentum to be larger, and the overpass of the oil outlet valve aperture will cause the rail pressure to be established for a long time. The structure parameters of the valve body also have obvious influence on the oil supply characteristics, which is larger than the oil supply phase and smaller than the plunger lift and plunger diameter. Fourth, the higher the duty cycle, the shorter the rail pressure build-up time, and the rail pressure fluctuation amplitude will obviously increase; fifthly, the low control pulse frequency will cause the rail pressure fluctuation to be too large, but has little effect on the rail pressure establishment time.
【學(xué)位授予單位】:江蘇科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TK403
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