Abstract
As a way of reducing the amount of Paniculate Matter (PM) contained in the exhaust gas, Diesel Particulate filter (DPF) is widely used. To maintain the condition of DPF normal and effective, estimation of the amount of PM deposit accumulated in DPF is very important. Occasionally, the value of pressure drop rises suddenly and it leads to overestimation of the amount of PM deposit. The behavior of PM deposit layer, while the value of pressure drop is increasing, is still unclear. In this paper, we reproduce the sudden pressure increase phenomenon using a commercial diesel engine and a DPF. Several conditions are found to be indispensable to reproduce the phenomenon. The authors also have developed a visualization method to realize the wide-perspective internal observation of DPF. Under the engine operating condition that causes the sudden pressure increase phenomenon, the wide-perspective internal observation experiment has been conducted to clarify the behavior of PM deposit layers in DPF. Off-line experimental result: the image of the DPF observation surface taken after the experiment, indicates that the PM deposit layers have collapsed darling the experiment.
