LPG/軽油およびDME/軽油ディーゼルエンジンの排気特性

抄録

Exhaust emission characteristics of direct injection diesel engines under dual-fuel operations were investigated. The secondary fuels used were propane and dimethyl ether (DME), which have low and high cetane number respectively. Two types of secondary-fuel mixing methods were employed ; one is the fumigation method and the other is binary-fuel injection (BFI) method. When DME was used as the secondary fuel for the fumigation method, low emissions in THC and NO were obtained in comparison with the case when the propane was used. In the BFI method, both secondary-fuel mixing caused a decrease in the NO emission without increasing the THC emission, but some amount of smoke was exhausted at high load and/or low secondary-fuel fraction.