混合动力汽车冷起动TWC动力学模型仿真研究

Simulation Research on TWC Dynamics Model During Cold Starting for Hybrid Electric Vehicle

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。

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