【正文】 今天的這篇論文。朱老師高深的學術修養(yǎng)、博學的理論和實踐知識、開闊的學術視野、科學的思維方法和嚴謹踏實的治學作風都使我受益匪淺。論文的選題、研究和撰寫工作均是在恩師朱余清副教授的悉心指導下完成的。在選題的過程中，朱老師指導我去了解國內外柴油機SCR技術的發(fā)展動態(tài)和研究方向，讓我有機會接觸到學術的前沿，開闊了眼界；在論文的探討過程中，朱老師多次為我指明方向，解決問題，少走彎路；在論文的撰寫過程中，朱老師從提綱到每一詞的使用都一一過目，嚴謹的科研作風、孜孜不倦的教誨、寬厚謙和的為人深深地鼓舞著我，將在我以后的人生道路上產生深遠的影響。在此，謹向我的導師朱余清副教授表示衷心的謝意和崇高的敬意！感謝我的班主任李君老師，謝謝他在這四年中為我們全班所做的一切，他不求回報，無私奉獻的精神很讓我感動，再次向他表示由衷的感謝。在這四年的學期中結識的各位生活和學習上的摯友讓我得到了人生最大的一筆財富。在此，也對他們表示衷心感謝。謝謝我的父母，感謝他們帶給了我無盡的支持，沒有他們辛勤的付出也就沒有我的今天，在這一刻，也將崇高的敬意獻給你們！最后，本文參考了大量的文獻資料，在此，向各學術界的前輩們致敬！
參 考 文 獻[1]帥石金，張文娟，董紅義，王建昕，王志. 柴油機尿素SCR 催化器優(yōu)化設計［J］.車用發(fā)動機，2007，（6）:4447.[2]Van Genderen M,Engine Dynamometer and VehiclePerfprmance of a Urea SCRSystem for HeavyDuty Truck Engines , Ines, Intern. Symposium on , Shanghai, 2004，（1）：35.[3]董堯清，吳樂欣，劉永祥，Ⅳ排放的技術路線［J］.汽車技術, 2007，（3）:14.[4] Catalytic Reduction（Final Report）the most promising technology to ply with the imminent Euro IV and Euro V emission standards for HD engines［M］.Germany:European Association of Car Manufactures，2003，（1）：46.[5]馬國勝， 在國內的應用與展望［J］.內燃機，2008，（6）:15.[6]［D］.武漢:，（3）:610.[7](urea)系統之介紹［J］.車輛研測資訊，2006，（9）:28.[8]Istvan Halasz,Alan Brenner. Selectivity determining role of C3H8/NO ratio in the reduction of nitric oxide by propane in presence of oxygen over ZSM5 zeolites. Catalysis Letters 51,1998，（1）：106109.[9]Cristian Ciardell. Reactivity of NO/NO2NH3 SCR system for diesel exhaust after treatment: Identification of the reaction networks a function of temperature and NO2 feed content ［J］.Applied Catalysis B: Environment，2007（70）:8090.[10]Giusweppe Maidia, Manfred of NO at low temperatures over sulphated vanadium on carbon coated monoliths: Effect of H2O and SO2 traces in the gas feed［J］.Applied Catalysis B: Environmental，2006，（66）:281287.[11]陶建忠，李國祥， 和SO2 在NH3 選擇性催化還原NOX 過程中的影響［J］.內燃機工程，2008，（3）:5663.[12] Catalysts，2003，（2）：48.[13]管斌，周校平，林赫，王真，［J］.車用發(fā)動機，2007，（5）:17.[14]［J］.黑龍江科技信息，2008（15）:6363.[15]佟德輝，李國祥，陶建忠，［J］.內燃機學報，2008，（4）:335340.[16]袁一，王文善，［M］.，（1）：714.[17]鐘祥麟，李孟良，［J］.2009，（5）：39[18]Lothar Hofmann，Klaus Rusch and Stefan Fischer，On board Emissions Monitoring on a HD Truck with an SCR System Using NOx Sensors［J］.SAE 2004，（1）：1290.[19]邢居真，高俊華，（SCR）技術降低柴油機NOx排放研究［J］.，（3）：518.[20]Willems，Cloudt，van den Eijnden，van Genderen， Verbeek，de Jager，Boomsma and van den Heuvel，Is Closedloop SCR Control Required to Meet Future Emission Targets［J］.SAE 2007，（1）：1574.[21]Da Yu Wang， Sheng Yao，Mark Shost，Joon Ho Yoo，David Cabush and David Racine，Ammonia Sensor for ClosedLoop SCR Control［C］.SAE World Congress ，2008，（1）：919.[22]Andrew Herman，Ming Cheng Wu，David Cabush and Mark Shost，Model Based Control of SCR Dosing and OBD Strategies with Feedback from NH3 Sensors［J］.SAE 2009，（1）：911.[23]Jim Nebergall，Eric Hagen and Justin Owen，Selective Catalytic Reduction OnBoard Diagnostics ［J］.SAE 2005，（3）：1036.[24]GB/T 19754—2005 .[25]SAE J2711— Practice for Measuring Fuel Economy and Emissions of HybridElectric and Conventional HeavyDuty .[26]李孟良,，（1）：13.[27], , of Emissions from HybridElectric and Conventional Transit 2000，（3）：2031.SCR Diesel Engine Technology and Application Prospect AnalysisHe Jiaming(College of Engineering, South China Agricultural University Guangzhou 510642, China)Abstract：Due to strong diesel power, low fuel consumption advantages in medium / heavy duty vehicle and truck on the widely used, but the main diesel engine NOX and PM emissions from gasoline emissions can not be like that by a threeway catalytic converter Control effectively resolved, in the development of the existing diesel engine emission control technology on the basis of new research and development for the advanced diesel engine exhaust after treatment technology is the key to survival and development of diesel engines.As the legal system of emissions equivalent to adoption of the European legal system, taking into account China39。s national conditions and the convenience of technology transfer, China39。s major OEMs and enterprises also tend to use diesel SCR technology as more stringent emission requirements to meet future major technical measures. At present, although several major domestic diesel engine business is already in the field of the SCR diesel technology research, but basically the introduction of foreign technologybased applications, the core technology is still mainly lies in the hands of foreignrelated manufacturers, which became the promotion of the technology And application of the main bottlenecks. This paper describes the SCR technology to reduce NOX emissions from diesel engine working mechanism, SCR system structure, SCR NOX emissions in a significant reduction in the advantages of SCR system performance and stability of the factors, therefore, on the localization of SCR technology increasingly urgent, SCR catalyst performance for the technology from the research, design optimization of catalytic converters to the urea injection system control strategy and application, OBD system development and calibration, to the entire system in the vehicle matching the integration and application of research is very necessary.In summary, the business of diesel engine emissions to meet the country Ⅳ has certain reference value, reduce the mercial vehicle diesel engine emissions in China, reducing air pollution has real social significance.Key words: Diesel engine SCR reduce Emissions