混合动力汽车冷起动TWC动力学模型仿真研究

发布时间：2018-01-18 09:19

本文关键词：混合动力汽车冷起动TWC动力学模型仿真研究　出处：《系统仿真学报》2017年01期 　论文类型：期刊论文

【摘要】：为降低汽油机冷起动阶段的排放,探究冷起动时因气缸内温度低而产生的缝隙效应、湿壁效应,以及油膜在壁面的吸附、释放和不完全燃烧等因素对碳氢排放的影响,考虑催化器涂层对氧气储存和释放对氧浓度产生的影响,在NEDC工况下对由集总参数法建立的TWC(Three-Way Catalyst)动力学模型进行仿真研究,获得气体进出TWC的温度、排放成分的量以及对应转化效率的变化曲线;并分别对O2流量为0.2 g/s,0.4 g/s,0.6 g/s时的HC和CO的转化效率进行分析,结果表明O2流量为0.6 g/s时HC、CO的转化率比0.2 g/s时提高了近20%,验证了模型的准确性和先进性,为能量管理控制策略的深入研究提供了理论依据。
[Abstract]:In order to reduce the emission of gasoline engine at cold start stage, the gap effect, wet wall effect and the adsorption of oil film on the wall caused by low temperature in cylinder during cold start were investigated. Effects of release and incomplete combustion on hydrocarbon emissions, and effects of catalyst coating on oxygen storage and release on oxygen concentration are considered. The kinetic model of TWC(Three-Way catalyst established by lumped parameter method was simulated under NEDC condition, and the temperature of gas entering and leaving TWC was obtained. The change curve of emission composition and corresponding conversion efficiency; The conversion efficiency of HC and CO at O _ 2 flow rate of 0.2 g / s ~ (0.4 g / s) and 0.6 g / s was analyzed respectively. The results showed that the conversion efficiency of HC and CO was 0.6 g / s at O _ 2 flow rate of 0.6 g / s. The conversion rate of CO is nearly 20% higher than that of 0.2 g / s, which verifies the accuracy and advanced nature of the model and provides a theoretical basis for the further study of the control strategy of energy management.
【作者单位】：重庆交通大学机电与车辆工程学院;
【基金】：国家自然科学基金(51305473) 重庆市基础与前沿研究计划(cstc2013jcyjA60007) 重庆市教委科学技术研究(KJ120421)
【分类号】：U469.7;TP391.9
【正文快照】： 引言1由于混合动力汽车的能量管理策略及城市工况的特殊性使得汽车频繁起停和怠速,从而严重增加发动机的起动次数,美国Wayne State University的研究测得发动机在单个FUDS工况下能够起动65次之多[1]。频繁的起停与怠速将使发动机过多的处于冷起动工况,从而降低三元催化转化器(

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