| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an exhaust air purifying device of internal combustion which can avoid a reduction in presumed accuracy of PM accumulation volume by the generation of bias sedimentation of PM at DPF. <P>SOLUTION: An exhaust temperature is obtained (S110) and an exhaust flow volume is obtained (S120). A temperature coefficient at the center in the diameter direction and the periphery of DPF in a cylindrical form which the exhausting flowing direction is the shaft direction is calculated from the exhaust flow volume (S130). The temperature at the center in the diameter direction of DPF is presumed from the exhaust temperature and the temperature at the center in the diameter direction and the periphery of DPF by multiplying the presumed temperature by the temperature coefficient (S140). Then the burning speeds of PM at the center in the diameter direction and the periphery of DPF are calculated from the temperature at the center in the diameter direction and the periphery of DPF (S150). The difference in burning volume obtained by calculating the burning speed of PM at the center in the diameter direction and the periphery is calculated as bias sedimentation rate of PM (S160). DPF is completely reproduced when the bias sedimentation rate of PM exceeds a predetermined value to resolve the state of bias sedimentation. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
