Abstract
In order to utilize bio-butanol as an alternative diesel fuel, the addition of a cetane number improver (2EHN) to the blend fuel of 1-butanol and gas oil was tried. And the ignitability, diesel combustion and emission characteristics of the blend fuels were investigated using a DI diesel engine. The addition of 1 mass% 2EHN sufficiently improved the ignitability of the blend fuels. When the mixing ratio of 2EHN/1-butanol/gas oil is 1/30/69 in mass%, the blend fuel has almost same ignitability and CO emission and slightly higher HC emission compared to the gas oil.