Abstract: A bench test is conducted on the catalytic diesel particulate filter (CDPF) of a high-pressure common rail diesel engine to study the effects of different structures of CDPF on the performance of engine and the pressure drop characteristics of CDPF under different soot loadings. A 3D thermodynamic model of CDPF is established, and the influences of ash loadings and ash distribution coefficients on the regeneration characteristics of CDPF with different structures are analyzed. The results show that CDPF would lower the performance and economy of diesel engine, but the CDPF with asymmetric cell technology (ACT), i.e. asymmetric CDPF, can effectively weaken the effects of the filter on the performance of diesel engine. The pressure drop of CDPF will rise with the accumulation of soot loading in filter channels and the CDPF with ACT can effectively reduce the pressure drop of filter, and the advantage of the asymmetric CDPF becomes more obvious as the amount of soot loading increases. Ash deposition is beneficial to the reduction of the thermal conductivity of the filter to the environment and increase the heat capacity of the filter, conducive to soot oxidation regeneration. The temperature of the filter during CDPF regeneration is higher in the center and rear end and lower in the periphery and front end. The ash distribution coefficient has little effect on soot oxidation rate. The filter structure, ash loading and ash distribution coefficient also have less effects on the maximum regeneration temperature gradient of CDPF

Key words: diesel engine, catalyzed diesel particulate filter, regeneration characteristics, ash loading, ash distribution coefficient