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| Effects of Ash on Diesel Particulate Filter Performance and Reliability |
| DOI：10.13949/j.cnki.nrjgc.2022.06.008 |
| Key Words:diesel particulate filter（DPF） ash regeneration pressure drop |
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| Abstract:In order to solve the problem that the ash accumulation in diesel particulate filter（DPF） increases with the increase of engine run time， the pressure drop characteristics of DPF at different ash loading amounts and the temperature change in DPF during active regeneration were studied on a diesel engine bench. Results show that the pressure drop increases rapidly due to the “deep bed” effect when ash is trapped in porous pores. And the pressure drop is lower than that without ash due to the “film layer” effect. The pressure drop increases linearly with the soot loading amount when the ash accumulation increases on the wall of the channels. The ash makes the peak of the internal temperature of DPF increase greatly and makes the internal temperature change dramatically during active regeneration. When the ash blocks the plug of channels， the pressure drop increases again rapidly. At the same time， the high-temperature area moves to the front end face of the filter， and the peak of internal temperature increases and the internal temperature changes dramatically again during active regeneration. In order to trigger active regeneration normally and reduce the internal temperature of DPF during active regeneration， the estimation accuracy of the soot loading amount should be improved by model-based calibration method. |
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