胡杰,王立辉,王天田.柴油机Urea-SCR控制系统设计与试验[J].农业机械学报,2016,47(2):349-356.
Hu Jie,Wang Lihui,Wang Tiantian.Design and Test of Urea SCR Control System for Diesel Engine[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(2):349-356.
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柴油机Urea-SCR控制系统设计与试验   [下载全文]
Design and Test of Urea SCR Control System for Diesel Engine   [Download Pdf][in English]
投稿时间:2015-07-06  
DOI:10.6041/j.issn.1000-1298.2016.02.046
中文关键词:  重型柴油机  SCR系统  控制策略  标定
基金项目:国家自然科学基金项目(51406140)和国际合作项目(2012DFA11180)
作者单位
胡杰 武汉理工大学 
王立辉 武汉理工大学 
王天田 武汉理工大学 
中文摘要:SCR后处理技术是目前降低柴油机NO x 排放量的主流技术,首先基于自主开发的SCR控制系统,阐述了系统的组成、工作及反应原理。其次通过协调控制策略以确保系统内部各模块运转正常,通过原机排放模型和化学反应动力学模型作为前馈控制得到尿素基本供给量,通过排温修正模型进行瞬态排温修正,利用发动机排温和储氨量的对应关系对氨泄漏进行有效控制,根据OBD法规要求当发动机NO x 排放量超标时进行报错。最后对系统中的各类传感器、执行器特性及原机排放MAP、目标转化效率MAP进行了标定。系统与某型号发动机匹配良好,经ESC循环测试NO x 比排放量为1.52 g/(kW ·h),ETC循环测试NO x 比排放量为2.09 g/(kW ·h),控制系统能够有效地降低NO x 排放量,满足国Ⅳ排放法规。
Hu Jie  Wang Lihui  Wang Tiantian
Wuhan University of Technology,Wuhan University of Technology and Wuhan University of Technology
Key Words:heavy diesel engine  selective catalytic reduction system  control strategy  calibration
Abstract:SCR after-treatment is the mainstream technology to reduce the NO x emission amount. The self-developed SCR system’s composition, operating and reactor mechanism were presented, and the coordinate control strategy was used to assure that the system’s inner module was operated regularly, the original emission model and chemical reaction kinetics model were adopted to obtain the raw value of urea supply amount, the exhaust temperature correction model was introduced to fix the instantaneous emission temperature, the relation between exhaust temperature and amount of NH 3 storage was used to effectively control the NH 3 leak amount, and failure warning was made according to the OBD regulation when NO x emission exceeded the standard. Each operation point had a NH 3 coverage ratio threshold which can ensure NH 3 leakage volume ratio was less than 1.0×10 -5 during the rapid heating process and try to improve the NO x conversion efficiency. According to the research results of the NH 3 coverage ratio and storage, the estimation model was established, and the leakage control strategy was put forward. The sensors and actuators of the system, original machine emission MAP and target conversion rate MAP were calibrated. The dosing control unit using above control strategy was adopted in the target engine. Test results showed that the brake specific emissions of NO x in ESC and ETC were 1.52 g/(kW ·h) and 2.09 g/(kW ·h), respectively, which indicated that the self-developed SCR control system can effectively reduce the NO x emission amount and reach the national Ⅳ emission regulation.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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