GPF被动再生烧蚀影响因素分析

Analysis of influencing factors of GPF passive regeneration ablation

为解决某车辆汽油机颗粒捕集器(gasoline particulate filter,GPF)烧蚀故障,在台架上进行断油试验模拟被动再生,设定不同的GPF碳载量和转速回落时间,分析其对再生过程中GPF入口温度、出口温度及床温的影响,研究GPF被动再生的最佳控制条件,试验和车辆道路测试验证结果表明:GPF床温超过载体耐受温度,容易导致内部烧蚀,影响GPF正常工作;将最大碳载量为5 g作为GPF被动再生的控制条件,可有效解决该发动机GPF烧蚀故障问题。

In order to solve the ablation failure of the gasoline particulate filter(GPF),the fuel cut-off test on the bench is used to simulate the passive regeneration,set different carbon load and speed fall back time of the GPF,analyze the influence of the inlet temperature,outlet temperature and bed temperature of the GPF,investigate the optimal control conditions for the passive regeneration of the GPF.The results of the experiment and the vehicle road test validate shows that the GPF bed temperature is higher than the carrier tolerance temperature,which will easily lead to internal ablation and affect the normal operation of GPF.Taking the maximum carbon load of 5 g as the control condition of passive regeneration of GPF,the ablation failure of GPF can be effectively solved.