胡杰，欧文中，王天田，颜伏伍.Urea-SCR系统周期性喷射控制策略试验研究[J].内燃机工程,2017,38(2):48-53.
Urea-SCR系统周期性喷射控制策略试验研究
Experimental Research on Periodic Injection Control Strategy for Urea-SCR System
DOI：
关键词:柴油机  urea-SCR  峰值转化效率  周期性喷射
Key Words:diesel engine  urea-SCR  peak conversion efficiency  periodic injection
基金项目:自然科学基金项目（51406140）
作者单位
胡杰，欧文中，王天田，颜伏伍 武汉理工大学 现代汽车零部件技术湖北省重点实验室 汽车零部件技术湖北省协同创新中心，武汉 430070 
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摘要:根据发动机稳态工况下的氮氧化物（NOx）转化率试验发现了NOx 转化效率峰值现象，通过分析从理论上解释了该现象。根据NOx 转化效率峰值现象，提出了尿素选择性催化还原（urea-SCR）系统周期性喷射设想。设计试验，通过对比自主urea-SCR系统周期性喷射策略与商业urea-SCR喷射策略的试验结果，发现urea-SCR系统周期性喷射在NOx 转化效率、尿素喷射量、氨泄漏及尿素能效比等方面均有显著改善，对优化urea-SCR系统尿素喷射控制策略有重要意义。
Abstract:The phenomenon of a peak NOx conversion efficiency found in a test for NOx conversion under engine steady state condition was analyzed theoretically. A periodic injection control strategy for a urea-SCR system was put forward based on this phenomenon to promote NOx conversion efficiency. A test was designed and the comparison was made of the proposed urea-SCR periodic injection control strategy and a commercial urea-SCR injection control strategy. The result shows the former strategy has a remarkable improvement in terms of NOx conversion efficiency， urea injection dosing， NH3 slipping， and energy efficiency to urea ratio， which has a great significance in optimizing the injection control strategy of a urea-SCR system.
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