According to its configuration , the monolith is considered to be a porous media . based on the monolith model and the use of software fluent , the research on the light - off characteristic and conversion efficiency of three - way catalytic converter is processed 在所建催化转化器模型的基础上,根据载体具有分布细小孔道的特点,将其作为多孔介质处理,利用fluent软件,对冷起动阶段三效催化转化器的起燃特性和转化效率作了数值模拟。
Relative to euro , euro emission regulations add the test of emission in 40s after cold - start . in order to meet the more strict emission regulations , the key question is how to make the three - way catalytic converter to light - off and increase the conversion efficiency . so it is necessary to do a numerical simulation on light - off characteristic and conversion efficiency of three - way catalytic converter in cold - start stage 欧排放标准相对于欧排放标准增加了冷起动头40s的有害排放物测试,为满足更严格的排放法规,如何使三效催化转化器尽快起燃,提高对排气的转化效率是关键问题,因此对三效催化转化器在发动机冷起动阶段的起燃特性和转化效率进行数值模拟研究是大势所趋。
This paper deals with synchronous measure technology of the cylinder pressure with the engine cold start by adoping micro - chip aduc812 , and it discuss the analysis of breakdown of engine cold start with the mixture of technology of information . through the analysis of the parameters of cylinder pressure of the engine cold start , turning speed and starting electricity , and according to the measure data and witness , a theory is to be inferred , and with the help of breakdown - checking systems , the engine piston groups and the breakdown of starting system can be judged . at last , the . remote measure technology of cylinder pressure ' s parameters 本文采用微处理器芯片aduc812研究发动机冷起动气缸压力的同步测试技术，讨论了基于信息融合技术的发动机冷起动故障诊断方法。通过对发动机冷起动气缸压力、转速、起动电流等参数的测试，根据测试数据和证据推理理论，借助故障专家系统，判定发动机气缸活塞组以及起动系的故障。最后研究了气缸压力等参数的遥测技术。
According to the phenomenon that some vehicles may come cross the starting difficulty after the engine running a period of time , the paper firstly analyzes , the practical meaning of engine cold start parameter for automatic testing and diagnostic systems , according to dempster - shafter amalgamation rule , requirement of proof , aining at concrete fact of breakdown diagnosing for engine cold start . conforming basic probability distribution function , it presents concrete realization for decision - making amalgamation arithmetic , completes for development of soft and hard wares of automation synchronous messure of engine cold start " s parameter 针对发动机运行一段时间后，部分车辆就会出现起动困难的故障现象，本文首先分析了发动机冷起动参数自动测试与诊断系统的实际意义，根据dempster - shafer证据理论的融合规则、要求，针对发动机冷起动故障诊断的具体实例，构造了基本概率分配函数，给出了决策层融合算法的具体实现方法，完成了发动机冷起动参数自动同步测试的软件硬件开发。
