闫立冰1,2，任宪丰1,2，张军1,2，张娟1,2，解同鹏1,2
1.内燃机可靠性国家重点实验室，山东潍坊261061;2.潍柴动力股份有限公司电控研究院，山东潍坊261040
摘要：针对国四排放标准实施后市场反馈的误报NOx排放超标问题，为保证选择性催化还原(selective catalytic reduction，SCR)满足车载自动诊断系统的要求，基于模型在环(model in the loop，MIL)离线仿真提出精确计算设定转换效率和转换效率限值的新方法。经MIL离线仿真和台架试验验证，新方法可以有效解决SCR效率诊断问题，为解决SCR转换效率误报问题提供了一种新思路。
关键词：MIL；离线验证；SCR效率；台架标定
Abstract:In view of the market feedback problem that NOx emission exceeds the standard in the initial stage of the implementation of CHINA Ⅳ, in order to ensure that the selective catalytic reduction (SCR) system can meet the requirements of the onboard diagnosis system, a new method based on model in the loop (MIL) is proposed to accurately calculate and set the conversion efficiency and its limit. The results of MIL offline simulation and bench test show that the new method effectively solves the problem of SCR efficiency diagnosis, and provides a new idea to solve the problem of SCR conversion efficiency false alarm.
Keywords:MIL; offline validation; SCR efficiency; bench calibration
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