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

作　　者：胡杰[1,2] 欧文中 王天田 颜伏伍[1,2] 

机构地区：[1]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

出　　处：《内燃机工程》2017年第2期48-53,共6页Chinese Internal Combustion Engine Engineering

基　　金：自然科学基金项目(51406140)

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。The phenomenon of a peak NOx conversion efficiency found in a test for NO~ 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.

关 键 词：柴油机 UREA-SCR 峰值转化效率 周期性喷射 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]