Additionally it is indicated that the rate of PM reduction in condition (C) is most efficient and that approximately 90% of PM at condition (A) is reduced at condition (C). In Fig. 17, in spite of the almost same dilution, PM in the filter No.5 and the filter No.6 is low as compared with PM in the filter No.3.
From the above results, it is proved that PM is reduced by PM reduction system.
5.3 Experimental waveforms
Fig. 18 shows the comparison of each waveform at Po=1.5[kW] of the switching current the switching voltage and the output current when the temperature of load is about 1200[K]. In Fig. 18 (a), the state before passing exhaust gas to PM reduction system is shown. And Fig. 18 (b) shows the state of passing exhaust gas to PM reduction system. In Fig. 18 (a) and Fig. 18 (b), these waveforms are similar and are stable. In addition, the output current realizes heavy current suppressing the switching current according to using complex resonance.
Fig. 17 Trapped PM
i1: 20A/div, Vs1: 200V/div, io: 20A/div, time: 10μ s/div, Ed=160[V], Po=1.5[kW]
Fig. 18 Waveforms
6. CONCLUSION
In this paper, PM reduction system using high frequency induction heating is proposed and that operation method at high temperature is described. Moreover the characteristics of that power supply are analyzed in detail. From experimental results by driving a marine diesel engine, it is proved that PM is efficiently reduced by PM reduction system.
7. REFERENCES
[1] Y.Hatanaka, S.Kubota and Y.Sekiya "Novel zero current switching high frequency inverter applied for an emission control in diesel engine," in Proceeding of EPE ' 97 Vol.4, (1997), pp.315-320
[2] S.Kubota, Y.Hatanaka, "A Novel High Frequency Power Supply for Induction Heating ," in Proceeding of PESC' 98 Vol.1, (1998), pp.165-171
[3] S.Kubota. Y.Hatanaka. " A Novel ZCS High Frequency Inverter in Complex Resonance Applied for Reduction of PM" in Proceeding of ICPE' 98, (1998), pp. 1036-1041
