背压和PN过滤效率是DPF载体和CDPF催化剂的关键性能指标，结合空白载体孔径和涂层负载两个方面开展研究，结果显示：孔径是影响DPF/CDPF背压和PN排放的关键，孔径越小，背压越大，PN过滤效率也越高。调低DPF载体孔径可提高PN过滤效率，但背压增率难以控制；通过涂层涂覆可有效调控孔径分布，实现向小孔径方向偏移，在提高PN过滤效率的同时可有效控制背压增率。基于此，协同载体技术和涂层涂覆技术，优选出中值孔径为11.5 μm的DPF载体，涂覆粒径D₉₀为3.5 μm、负载量为15 g/L的涂层，涂覆后背压增率为8.88%，PN排放为9.34×10¹⁰ 个/（kW·h），在满足国六排放法规的前提下，可同时兼顾高效的PN过滤效率和较低背压增率。

Back pressure and PN filter efficiency are key indicators of DPF carrier and CDPF catalyst. Research was conducted based on blank carrier pore size and coating load. The results showed that the pore size was the key that influenced the DPF/CDPF back pressure and PN emission. The smaller the pore size, the greater the back pressure, and the higher the PN filter efficiency. Decreasing the pore size could improve the PN filter efficiency, but the increase rate of back pressure is difficult to control. After applying the coating, the distribution of pore size was effectively controlled and shifted towards small pore size, which achieved the simultaneous improvement of PN filter efficiency and effective control of back pressure increase rate. Based on the collaboration of carrier and coating technology, DPF carrier with a median pore size of 11.5 μm was selected, the coating of 3.5 μm particle size and 15 g/L soot load was applied, and the back pressure increase rate and PN emission were 8.88% and 9.34×10¹⁰ #/（kW·h） respectively after coating. Accordingly, the requirements of China Ⅵ emission regulation were met and the efficient PN filtering and low back pressure increase rate were achieved.