The main principles to determine the right moment for the regeneration of diesel particulate filter ( DPF) is proposed, the features of different judgment methods on regeneration schedule are compared, and the nu merical simulation and experimental study on the pressure drop of filter are carried out. Then a new judgment scheme on regeneration schedule is proposed, in which the right time for DPF regeneration is determined by calcu lating particulate matters deposition according to the flow rate, temperature and back pressure of exhaust gas, based on the pressure drop model for filter. The results of study show that the soot mass limit is 4g/L for cordierite filters and 8g/L for SiC filters, without considering the specific regeneration control strategy.%提出了确定柴油机颗粒捕集器再生时机的主要原则,同时比较了不同的再生时机判断方法的特点,对过滤体的压力损失进行了数值模拟和试验研究.基于过滤体压力损失模型,根据排气流量、温度和背压计算颗粒沉积量,提出了新的再生时机判断方法.研究表明,在不考虑具体再生控制策略的前提下,堇青石过滤体的累积颗粒物的限值为4g/L,而SiC过滤体为8g/L.
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