【作者】 江同；

【导师】 胡章其； 楚书华；

【作者基本信息】 浙江大学 ， 动力机械及工程， 2004， 硕士

【摘要】 21世纪人类面临着能源短缺和日益恶化的环境污染。为解决这些问题，走可持续发展道路，人们正在寻找一条既能合理利用资源，又能保护生态环境的途径。 随着汽车工业的高速发展及汽车保有量的急剧增加，汽车造成的环境污染及石油危机问题日益突出。发展低污染的绿色汽车是当今世界汽车发展的主要趋势。目前，众多代用燃料在内燃机上得到愈来愈广泛的应用，特别是燃气汽车的发展为油品短缺和环境保护提供了广阔空间与良好契机。近几十年来，燃气汽车发展较快，在一些发达国家已形成一定的产业规模。近两三年来，我国的燃气汽车亦备受青睐，发展势头强劲。 在众多代用燃料中，液化石油气LPG(Liquefied Petroleum Gas)以其能量密度高于天然气NG(Natural Gas)，易于液化(0.5～1MPa即可液化)，便于充装携带，以及优异的排放性能和动力性能受到越来越多的青睐，近年来在汽车上得到了优先发展。 本文是在国内外相关研究的基础上，对车用柴油／LPG双燃料发动机进行的工作状态的控制及性能研究。实验采用单片机控制进气道预混合混合器的供气方式，对490Q直喷式柴油机进行了柴油／LPG双燃料的技术改造。在分别燃用全柴油和柴油／LPG双燃料的情况下，得到了相应工况下动力性、经济性以及排放噪声等性能指标的对比试验结果。 试验结果表明：燃用柴油／LPG混合燃料，发动机的动力性有所提高；经济性在低负荷时优于全柴油，高负荷时较差；排放方面，烟度大幅降低，NO_x也有所降低，排温和噪声都较原机低。更多还原

【Abstract】 In 21st century, people are faced two problems: energy crisis and worsened environment. The countermeasures of sustainable use of energy resources are put forward.Along with the development of automobile industry and the rapid increase of automobile amount, the environmental problem is even worse. To develop green-vehicle is the growing trend in automotive technology. In recent years, the application of gas-vehicle has been popularized.Liquefied petroleum gas (LPG) is a mixture of butane and propane. A specific feature of these hydrocarbons is that they can turn to liquid even at room temperature and at relatively low pressure (about 0.5~1MPa). Liquefied petroleum gas can be easily stored and transported in a liquid state with high energy density. The vehicles that run on liquefied petroleum gas have fewer combustion deposits and lower emissions based on present-day legislation, and the throttles aren’t reduced. For its technical advantages in comparison with diesel/petrol engine, dual-fuel engine is widely used.In this paper the research work has been put on the Model 490Q engine by changing the diesel/LPG dual-fuel technique through using ECU to control the air feed mode of the inlet channel blender. Contrastive test results of performance can be obtained when separately using diesel and diesel/LPG dual-fuel.The result shows that when using diesel/LPG dual-fuel the engine’s power is increased .At low-load the economy viability of the dual-fuel engine is better than the diesel engine, however at high-load the diesel engine is better. As for the exhaust emission, the smoke level is considerably decreased, and NOx emission level is debased also.更多还原