导　　师： 彭美春

学科专业： 080203

授予学位： 硕士

作　　者： ;

机构地区： 广东工业大学

摘　　要： 日益严格的排放法规、改善内燃机经济性及动力性的需求对柴油机提出了越来越严格的要求。近年来随着设计制造水平的提高，柴油机在燃油经济性和排放控制方面得到了很大改进，并且随着柴油机在噪声和振动方面获得突破，柴油机的应用和研究迎来了新的高潮，然而柴油机NOx和碳烟排放一直居高不下，阻碍了其进一步的发展。国内外研究表明，乙醇柴油混合燃料能够有效降低碳烟的排放，但对NOx的降低不明显，废气再循环/(EGR/)是直接在缸内减少NOx排放的最优策略之一，两者结合可以使柴油机适应更加严格的排放法规。 本文课题来自广东省科技计划项目“乙醇／柴油混合燃料车用发动机的开发研究”，以顺德德力柴油机股份有限公司生产的DL190-12柴油机为研究对象，在燃用乙醇柴油混合燃料的基础上开展EGR控制技术研究。分析了各种柴油机EGR控制系统的优缺点，选定适合的EGR系统配置方案，制定了可行的EGR技术方案。提出了利用发动机负荷特性实验数据获得EGR阀最佳真空度的线工况标定方法，实现对EGR阀升程真空度的标定。本研究对发动机的EGR率进行了试验标定。为了实现发动机性能综合优化的目标，本文利用价值工程原理对发动机性能标定数据进行处理，提出了评价指标，给出了评价对象的权重，并采用二级评价方法得出EGR阀最佳真空度MAP图。本研究开发了一套适合于DL190-12乙醇柴油混合燃料发动机的电控EGR系统，设计了控制系统软硬件，本电控EGR系统通过传感器检测发动机所处的工况后，通过电控单元ECU处理，发出控制信号，由EGR电磁阀对EGR阀的升程实行控制，保证了发动机工况范围内的最佳EGR控制要求。 本文通过实验得出，DL190-12乙醇柴油混合燃料发动机采用本研究开发的电控EGR系统后，相比原柴油� In order to meet the requirement of stringent emissions control legislation increasingly and improvement of fuel consumption and power of diesel, the advanced diesel engine solicits highly criteria for its overall performances. In recent years, diesel has undergone very significant improvements in terms of fuel economy and exhaust emissions. However, it is true that a major difficulty with the diesel engine is to control the emissions of nitrogen oxides /(NOx/) and particulate mater /(PM/). Recent research showed that ethanol-diesel blend fuel can effectively reduce the emissions of PM, but the reduction of NOx is not obvious, Exhaust Gas Recirculation /(EGR/) is one of the more promising strategies to reduce NOx emissions within the cylinder directly. So the combination of ethanol-diesel blend fuel and EGR could meet the requirement of more stringent diesel emission regulations. Based on the research project 'the research and development of ethanol//diesel blend fuel vehicle engines ' funded by Guangdong Province, this paper launched the study of EGR control technology on a diesel model DL190-12 manufactured by Shunde Deli Machinery Co.Ltd. The paper analyzed the advantages and disadvantages of various types of EGR control system, selected a suitable configuration program of EGR system, carried out whole design of EGR system. It was proposed a EGR calibrating method on engine line condition to get the best vacuum of EGR valve by engine load characteristic experiment. The study carried out calibration test for EGR rate of engine. In order to integrating optimum engine performance, the paper processed the data of engine calibration by value engineering principles. It was proposed the evaluation index, given their weights, and got the best vacuum MAP of EGR valve by two-grading evaluation methods. An EGR electronic control system was developed for DL190-12 engine with ethanol-diesel blend fuel, and the hardware and software for the system were designed. It detects engine's condition by sensors, then ECU se

关 键 词： 柴油机 乙醇柴油混合燃料 废气再循环 电控系统 氮氧化物

领　　域： [机械工程] [交通运输工程] [交通运输工程]