플라즈마 버너를 이용한 복합재생방식 DPF 시스템 개발

As soot particles are loaded in a diesel particulate filter, the filter should be regenerated periodically or continuously in the exhaust system. For the passive DPF system with catalysts, chemical reactions make a continuous regeneration of the filter. But the use of this fully passive DPF system is practically limited to high engine loads condition. Especially for the low engine loads driving pattern, there is no regeneration method in the passive DPF system. The active DPF system with a burner is an attractive alternative because the regeneration of the filter at all the engine condition could be possible. This study describes the development of the active DPF system using a plasma assisted burner regeneration considering the stability of flame, efficiency of the burner and control logic of the system. Engine bench tests are performed to verify these performances of the burner system. Results from these tests show that increased exhaust gas temperature leads to faster regeneration. Also high efficiency of the plasma assisted burner is shown.