基于Simulink的稀燃汽油机LNT系统仿真模拟  

Simulink-Based Simulations of LNT System of Lean Burn Gasoline Engine

作　　者：刘磊[1] 李志军[1] 岳东鹏[2] 张洪洋[1] 常庆[1] 马小强[3] 林漫群[3] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]天津职业技术师范大学汽车与交通学院,天津300222 [3]天津大学内燃机研究所,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2013年第11期963-968,共6页Journal of Tianjin University：Science and Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA06Z322);国家自然科学基金资助项目(50276042;50776062;51276128);天津市自然科学基金重点资助项目(11JCZDJC23200)

摘　　要：以Matlab中的Simulink模块为主要数值仿真模拟工具,建立了LNT（lean NOx trap）催化器内部NOx相关反应的数值仿真模型.利用该模型,对稀燃汽油机LNT催化器内部NOx吸附、脱附、再生等相关工作过程进行了动态数值仿真模拟.以LNT催化器内设定的NOx吸附上限对其最大吸附能力的比值作为再生开始的信号,理论值为1,工程应用值通常为0.6以下.经与该稀燃汽油机LNT催化器的台架试验数据对比分析发现,该模型在再生信号比值0.65以下应用时,数值模型的仿真值与试验值吻合良好.对于应用概率极小的再生信号比值为0.65~1区间内的情况,数值模型需要用化学动力学数据进一步修正.A dynamic numerical simulation model of lean NOx trap（LNT）was constructed to calculate NOxrelated chemical reactions with Simulink block of Matlab as the main simulation tool. Using this model,the dynamic numerical simulations were applied to analyze NOx adsorption,desorption,regeneration and related work process in the lean-burn gasoline LNT catalytic converter. The ratio of upper limitation of NOxstorage to maximum NOxstorage capability of LNT was set as the regeneration signal,theoretical regeneration signal being 1,and the regeneration signal of engineering applications was generally smaller than 0.6. Compared with the data from lean-burn gasoline engine test bench,the simulation results show that the numerical model predictions are in good agreement with the engine test bench data when the regeneration signal is set less than 0.65. However,in the minority case of the regeneration signal being set smaller than 1 but larger than 0.65,the numerical model needs to be revised by chemical kinetics data.

关 键 词：SIMULINK 稀燃 稀燃NOx捕集 NOx 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]