Abstract: Without configuration modification of a turbo-charged after-cooled direct injection diesel engine, two kinds of diesohol fuel (E10 and E15) were used to study their effect on engine performance, fuel economy and exhaust emission. The results show that the power output of engine decreases while the brake specific fuel consumption (bsfc) increases. The brake specific energy consumption (bsec) using diesohol increases at the low load and is equivalent at the mid-to-high load range in comparison with that of the diesel fuel.The engine emission performance shows that CO emission and the smoke emission decrease obviously, HC emission increases gradually, especially at the low load, and NO_x emission decreases at the low load and low speed conditions while is equivalent at the high speed. The tests according to ECE R49 13-mode indicate that many brake specific emissions increase. The major reason is that the contributions of low load conditions increase. This study will provide the basis for the next study, putting emphasis on the low load conditions.

Key words: diesohol, turbo-charged diesel engine, diesel engine performance, ECE R49 13-mode