The study proved that in order to get better power and emission performance , the lpg ratio should be controlled between 40 and 50 percent and the structure and working parameters should be optimized ; however , lpg should be fueled as less as possible when low load 本文研究表明：将lpg的掺烧比控制在40 - 50之间，进一步改进发动机的结构参数和运行参数，可以获得更好的lpg柴油双燃料发动机的综合特性；在低负荷时，尽量不要燃用lpg 。
The timing - and - quantitation precision injection of lpg was realized with high - speed lpg solenoid valve and a set of electronic control system , which was designed by the author and can flexibly control the gas supply system of lpg . based on the analysis of experimental data got by comparing the performances before and after the application of the set of equipment on lr6105q12 diesel engine , the effects of load , speed and replace ratio , etc on the emissions of smoke , hc and co of dual fuel engine were expounded . through optimization , the smoke emission was utmostly reduced and the emissions of hc and co were within the government restriction 为此，本文通过对各个方案进行详细比较，选择了电控多点顺序喷射的供气方案；利用高速lpg喷射阀和自己独立开发出一套电子控制系统对lpg供气进行灵活地控制，实现了lpg的定时定量喷射，并把这套装置应用到中国一拖生产的lr6105q12柴油机上，在对改装前后的发动机进行大量试验和分析的基础上，阐明了负荷、转速、掺烧比等因素对双燃料发动机的烟度、 hc 、 co等排放的影响情况，并且通过优化，最大限度地降低了发动机的烟度排放，同时使hc 、 co排放限制在国家标准规定的范围之内。
The pilot fuel model has been given to calculate the distribution of the liquid fuel and time of fuel pre - combustion , at the same time , analyzing the important action to the combustion of the natural gas in the combustion chamber of engine , determining the best quantity of pilot fuel . the explosive combustion model has been established to compute the pressure of the cylinder during the combustion , determining the main influence factors . the emission model has been established to forecast the co , nox emission 理论方面，提出了基于化学反应的燃烧模型?多组分气相反应系统的化学反应动力学模型，以此进行双燃料发动机的热力学?化学反应动力计算；引燃油燃烧模型，计算引燃油液滴的分布规律和滞燃期，验证引燃油在双燃料发动机燃烧过程中的作用，揭示不同喷油规律对双燃料发动机的影响，确定在不同负荷下的合理引燃油量；爆震模型，揭示爆震与工质能量释放间的关系和影响爆震的各种运转因素，确定合理的爆震依据，减小爆震倾向。
In this paper , the indicator diagrams of a diesel - lpg dual fuel engine and an original diesel engine are measured by a cb366 combustion analyzer . comparative calculations and analyses on combustion characteristics of the dual fuel engine and the original diesel engine are put up in detail . some results about the combustion charateristics of dual fuel engines are obtained 利用cb366燃烧分析仪测录了柴油?液化石油气双燃料发动机和原柴油机在不同工况下的示功图，进行了放热规律的计算和对比分析，得出了有关双燃料发动机燃烧特性的结论。
The results of the experiments has shown : the lpg / diesel dual fuel engine has kept its high power performance and reduced its emissions , especially the soot and nox after the fuel - supplied system has been set up ; the fuel economy performance has been improved at some degree when high load ; however , when lpg ratio increased , the engine showed the trend of violence for high compression ratio 试验结果表明：在采用了自行设计的联动式燃油供给系统后， lpg柴油双燃料发动机在保持原机高功率的同时，排放量，尤其是碳烟和no _ x有大幅度的降低；在高负荷时，其燃油经济性也有相当的提高。但当lpg的掺烧比加大到50以上时，会出现工作粗暴的倾向。
This thesis firstly focuses on the way of using cng in turbocharged diesel engines . aiming at the automobile diesel engine of the type of d6114 , some experiments contrasted the differences in performance between the diesel / cng dual fuel engine and the mere diesel engine . the result shows that some suitable strategies must be followed in the use of cng in turbocharged diesel engines to certify the good dynamic performance and low emission 论文首先探讨了增压发动机使用代用燃料( cng )的方式，针对d6114型车用增压发动机进行了原机和双燃料发动机的对比实验，实验结果表明， cng在增压发动机上的掺烧需要遵循一定的掺烧策略才能保证良好的动力性能和实现较低排放。
The results state that the nox emission of the premixing dual fuel engine is lower than that of mixing injection dual fuel engine in the whole loads , but the emission of hc and co is reverse . in light loads , the smoke of both dual fuel engines is same ; in heavy loads the smoke of premixing dual fuel engine is lower . 6 研究结果表明：在整个负荷范围内，预混进气双燃料发动机的no _ x排放明显低于混合喷射双燃料发动机；混合喷射双燃料发动机的hc和co排放较低；在小负荷二者的烟度相差不大，但在大负荷预混进气双燃料发动机的烟度较低。
