摘要
为满足非道路国四排放标准对柴油机排气污染物NOx限值的要求,结合基于模型开发的设计思想和V模式开发流程,完成了从需求架构设计、MATLAB/Simulink建模开发、软件测试确认的智能SCR软件开发。智能SCR软件的控制策略主要包括催化器模型、前馈控制模型、氨存储计算模型、尿素量修正模型、尿素喷射控制模型等。然后将智能SCR软件与柴油机其它控制功能进行软件集成,并将生成的ECU软件刷写至非道路国四ECU。最后在试验台架上完成了多组冷机和暖机的非道路瞬态循环(NRTC循环)测试。试验结果表明:在NRTC试验循环下,NOx转化效率最高达到了94.46%,经催化还原后的NOx排放值达到了0.464g/(kW·h),低于非道路国四排放标准对排放物NOx的排放限值要求,开发的智能SCR软件可以批量应用于非道路国四柴油机。
A order to meet Non-Road T4 emission standard for requirements of diesel engine exhaust pollutants NOx limits, combined with the model-based design idea and the V-model development process, an intelligent SCR software from requirement and architecture design, MATLAB/Simulink modeling development, software testing and validation is completely developed. Control strategy of the intelligent SCR software is mainly included catalytic converter models, feed forward control models, NH3 storage and calculation models, urea quantity correction models, urea injection control models, etc. The intelligent SCR software is integrated with other control functions of diesel engine,and the generated ECU software is written into a Non-Road T4 ECU. It is tested finally several times with cold and warm Non-Road Transient Cycles(NRTC) on a test bench. The test results show that under NRTC test cycle, the NOxconversion efficiency reached the highest 94.46%, and the NOxemission value after catalytic reduction reached 0.464 g/(kW·h), which was lower than the NOxemission limit of non-road T4 emission standard, the developed intelligent SCR software can be applied to the series product of non-road T4 diesel engines.
作者
黄永鹏
刘星
叶宇
梁郑岳
HUANG Yong-peng;LIU Xing;YE Yu;LIANG Zheng-yue(Guangxi Yuchai Machinery Co.,Ltd.,Nanning 530007,China)
出处
《内燃机与配件》
2020年第4期26-29,共4页
Internal Combustion Engine & Parts
