WLTC工况下汽油机颗粒捕集器性能研究

通过AVLBOOST软件设计缸内直喷汽油机后处理系统模型,即三元催化转化器以及汽油机微粒捕集器(Gasoline particulate filter,GPF)的组合模型。研究了WLTC(Worldwide Light-duty Test Cycle)循环工况对该模型的HC转化效率以及汽油机微粒捕集器的捕集效率和压降的影响。结果表明:在WLTC循环工况下三元催化转化器HC转化效率在90%上下浮动,汽油机微粒捕集器的压降受排气流量影响较大,压降线图与排气流量线图基本一致。GPF的颗粒捕集效率可以稳定在90%。GPF压降平均值在1~2kPa之间,最高压降为5.5kPa,满足GPF压降要求。

Study on Performance of Gasoline Particulate Filter Base WLTC

The model of the post-processing system of the direct injection gasoline engine was designed by AVL BOOST software,which is a combination model of Three Way Catalytic and Gasoline engine Particulate Filter(Gasoline particulate filter,GPF).The effects of the WLTC (Worldwide Light-duty Test Cycle) circulatory conditions on the HC conversion efficiency of the model and the effects of the filter efficiency and pressure drop of the gasoline particulate filter were investigated.The results show that the efficiency of the three-way catalytic converter converting HC is about 90% in the combined model of three-way catalytic converter and gasoline particulate filter under the circumstance of WLTC.The pressure drop of the particulate filter of the gasoline engine under the WLTC cycle condition is greatly affected by the exhaust gas flow rate,and the line graph of the pressure drop of the gasoline engine particulate filter is basically the same as the exhaust gas flow line graph.The particle filter efficiency of GPF can be stabilized at 90%.The average pressure drop of GPF is between 1 000 Pa and 2 000 Pa,and the maximum pressure drop is 5 500 Pa,which meets the pressure drop requirement of GPF.