Abstract
Diesel engines are a major source of PM (particulate matter) emissions. Currently, most manufacturers use DPFs (diesel particulate filters) to reduce the PM emissions. However, one of the major drawbacks of using DPFs is that complete DPF regeneration is impossible by using only catalyst aided passive technology because of the low exhaust gas temperature. As an alternative technology, various active-regeneration-type DPF systems, such as diesel combustors, electrical heating systems, and the post fuel injection method, have been developed. This study introduces a new active DPF regeneration technology for a diesel fuel burner using an electric swirl arc as the ignition source. The DPF system consists of DOC (diesel oxidation catalyst), DPF, burner, and an ECU (electronic control unit). This study shows that this diesel fuel burner can regenerate the DPFs without any difficulties, irrespective of the engine operating conditions. This study also discusses the optimization of the amount of catalyst used, and the length, and diameter of the DOC. The pore structure of a metal fiber filter has also been optimized in order to enhance the PM reduction capability. Results of the durability test are also described in this study.
Keywords: Active Regeneration, Diesel Burner, DOC (diesel oxidation catalyst), DPF (diesel particulate filter), Electric Swirl Arc