车用三效催化器快速老化SBC循环试验研究

摘要

针对GB18352.6-2016中规定的污染物控制装置耐久性快速老化标准台架循环(SBC)的温度、空燃比等的条件要求,利用试验发动机对如何确定满足规定条件要求的发动机工况进行了探索.基于对SBC循环的研究,提出了满足SBC循环工况的试验方案;通过稳态工况催化器温度场试验,分析了不同因素(空燃比、点火提前角、二次空气喷射等)对催化器温度的影响.结果表明:试验样机满足催化器温度800 ℃的运行工况分布在2 000 r/min高负荷至3 800 r/min中低负荷的带状区域内;与点火提前角相比,空燃比和二次空气喷射对催化器温度影响更明显;可以通过循环一致性、老化时间、工况过渡时间等因素对不同工况方案进行选择.%It was explored how to determine the engine conditions that meet the control requirements of temperatures,air fuel ratios and so on in the standard of GB18352.6-2016 using an experimental engine.The experimental scheme meeting standard bench cycle (SBC) was proposed,based on the investigation to the SBC cycle used in the rapid aging of the catalytic converter.Through the experiments carried out in the steady state catalytic converter temperature field,the influence of different factors on the temperature of catalyst was studied,such as the air-fuel ratio,ignition advance angle,air injection and etc.The results show that the working mode of the catalytic converter prototype that satisfies the temperature of 800 ℃ distributes in the strip area of 2 000 r/min high load to 3 800 r/min low load.Compared with the ignition time,air-fuel ratio and air injection affect the converter temperature more obviously.Different cycle options can be selected through cyclic consistency,aging time,and transition time.