Experimental study on pressure difference and temperature field characteristics during active regeneration of DPF

DING Xiaohui; XU Wenxiu; YIN Xiangkai; DONG Guanglei; ZHENG Xue

doi:10.19471/j.cnki.1673-6397.2026.01.006

Abstract：In order to enhance the reliability of diesel particulate filters(DPF)and provide guidance for the active regeneration control,bench tests are conducted to investigate the pressure difference characteristics during the soot accumulation process of DPF and the internal temperature variation patterns during active regeneration.The results indicate significant differences in the pressure difference characteristics of DPF during different soot accumulation stages.The pressure difference of the DPF during the re-accumulation process after regeneration is on average about 2 hPa lower than before regeneration.During normal active regeneration,the axial temperature inside the DPF increases sequentially from the front to the rear,with the highest temperature point occurring at the rear end face of the DPF,reaching 715 ℃.The inconsistency of radial temperature indicate uneven combustion inside the DPF.During active regeneration process under drop to idle(DTI)operating conditions,the internal temperature of the DPF rises rapidly,reaching up to 1 034 ℃.When the soot loading exceeds 4 g/L,the internal temperature of the DPF increases linearly and rapidly with the soot loading.A higher DOC light-off rate causes the internal temperature of the DPF to rise rapidly in a short period of time.When the light-off rate is 6.5 ℃/s,the internal temperature of the DPF reaches 1 076 ℃.DTI operating conditions during active regeneration process,higher soot loading,and a higher DOC light-off rate are the main factors that increase the thermal risk during DPF regeneration,which must be reasonably controlled in practical applications.