Investigation of High Frequency Induction Heating Applied for Reduction of Particulate Matter from Marine Diesel Engine

1.柴油机微粒过滤器(DPF)的结构和材料研究在2002年研制的圆柱型DPF的基础上，对其结构进行了改进，并采用了一种特殊的金属板。设计了一种新型高频逆变器，用于高频感应加热电源的研制。建立了一种新型的高频逆变器的设计方法，该逆变器能够在低输入电压下提供高幅值的输出电流和抑制的开关电流。设计了数字门极脉冲控制电路，实现了柴油机从暂态到稳态的切换。3.柴油机PM还原及感应加热再生试验柴油机排气中的PM被DPF捕获。通过反复感应加热来再生DPF。结果表明，DPF再生的最佳加热温度与所需电能有关。通过实验，对PM进行了一定的捕获，实现了感应加热DPF的再生。

1.Investigation of construction and material for a diesel particulate filter (DPF)On the basis of a cylindrical type of DPF which had been developed in 2002, a special metal fiver has been applied for the new model of DPF with improvement of the construction. The new model of DPF enables to trap the particulate matter (PM) from diesel engine efficiently with suppressed back pressure of exhaust gas.2.Development of a novel high frequency inverter for high frequency power supply of induction heatingA new method of design procedure of a complex resonant full bridge type zero current switching (ZCS) high frequency inverter which provides high amplitude of output current with suppressed switched current in low input voltage has been established. A digital gate pulse control circuit has been also developed and all switching modes form transient to steady state condition can be switched in ZCS operation.3.Experiment of PM reduction from diesel engine and regeneration of DPF by induction heatingThe PM exhausted from diesel engine is trapped by DPF. The DPF is regenerated by induction heating repeatedly. In the results, the optimum heating temperature for regeneration of the DPF in connection with required electric energy has been cleared. Through the experiments, PM has been trapped certainly and regeneration of the DPF by induction heating has been realized.