超高過給と広域多量EGRを伴うディーゼル燃焼と排気の単気筒試験機関を用いた研究 : EGR率が50%を越える場合のNO_xと微粒子の排出挙動(熱工学,内燃機関,動力など)

概要

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For NO_x reduction, it is significant to increase EGR however excessive EGR involves smoke deteriortions. The slightly lower EGR rate than smoke deteriorating EGR rate is thought as maximum EGR rate. This study gives an example to increase the maximum EGR rate from 30% to 50% even at high BMEP operations such as BMEP=2MPa and expect furthermore reduction of BSNO_x. This is achieved by new technologies such as 200MPa fuel injection pressure, 451.3kPa boost pressure at BMEP=2MPa and the improved flow coefficient of intake port to increase the intake air quantity into cylinder. The high flow port realizes about 5% increase of maximum EGR rate, 200MPa fuel injection pressure also allows increasing 5% of maximum EGR rate. Finally, heightening boost pressure from 400kPa to 450kPa contributes to increase a more 5% increase of EGR and it reaches 50% of maximum EGR Rate. The BSNO_x emissions on BMEP=2MPa reduces from 3.5g/kWh to 1.0g/kWh by these process without smoke and PM deteriorations. Using these technologies also effective in improvement of BSFC.
社団法人日本機械学会の論文
2009-07-25