Abstract: The exhaust emissions from a turbo-charged and intercooled compression ignition engine fueled with the E10 diesohol(10%m alcohol+90%m diesel, and the necessary solubilizing agent was added to assist their mutual solubility) were measured according to the ECE R49 13-mode test cycle. The results show that the brake specific emissions of HC,NO_x, PM and SOF from the engine using E10 are higher than those using diesel fuel, while the brake specific emissions of CO and DS are lower. The reason for emission deterioration from the diesohol operation is the emission contribution rates increase at low-to moderate loads which may attribute to decrease of in-cylinder change temperature. Increasing the intake temperature at low-to moderate load operating conditions may compensate the temperature drop caused by the ethanol vaporization in the cylinder, leading to the decrease of brake specific emissions of the CO, HC, PM, and SOF, but with increase of the NO_x emission.

Key words: internal-combustion engine engineering, diesohol, turbo-charged diesel engine, diesel engine exhaust emission, ECE R49 13-mode test cycle