The evolutionary mechanism of soot layer has a significant impact on Diesel Particulate Filter (DPF) regeneration process, which gains more interest due to environmental related requirements. In this study, a visualized single-channel filter deposition/regeneration test bench is re-designed to investigate the relation between soot layer thickness and pressure drop. Various operating conditions corresponding DPF and catalyzed DPF (CDPF) are tested and show good agreement. The results indicate that there are three stages among the regeneration process for samples. The decrease rate of the second pressure drop does not change significantly when the deposition thickness of the soot layer on the CDPF within 72–132 μm. Meanwhile, the CDPF is more sensitive than DPF responded to the filtration velocity. Besides, the decrease rate of thickness of CDPF (0.9 μm/min) is much higher than the DPF (0.39 μm/min) in the first stage, and soot layer of CDPF has a sharp drop in thickness. Overall, it is concluded that the oxidation process on bare DPF soot layer is ″Top TO Bottom″, while CDPF is ″Top AND Bottom″.

烟尘层的演变机理对柴油机微粒过滤器（DPF）的再生过程有重大影响，由于与环境相关的要求，烟灰层的发展引起了更多的关注。在这项研究中，重新设计了可视化的单通道过滤器沉积/再生测试台，以研究烟灰层厚度与压降之间的关系。测试了与DPF和催化DPF（CDPF）相对应的各种操作条件，并显示出良好的一致性。结果表明，样品的再生过程分为三个阶段。当CDPF上的烟灰层沉积厚度在72–132μm之内时，第二次压降的下降率不会发生明显变化。同时，CDPF对DPF的响应速度比DPF敏感。此外，CDPF的厚度减少率（0。9μm/ min）比第一阶段的DPF（0.39μm/ min）高得多，并且CDPF的烟尘层厚度急剧下降。总的来说，得出的结论是，裸露的DPF烟灰层的氧化过程为顶部到底部”，而CDPF是“顶部和底部”。