Biodiesel is a remarkable alternative fuel for the diesel engine among various countries. Various studies are carried out on the environmental and economic effects as well as the nature of diesel engine fuel biodiesel in the combustion process and emission characteristics. In this study, CRDI diesel engines used diesel fuel and 20 % biodiesel blend fuel (BD 20 %) as fuel, with City-mode exceeding 300 hours. Engine performance and emissions were sampled at one-hour intervals for analysis. The engine was inspected after testing to check the engine parts (valves and injectors). It was concluded that 300 hours of operation using BD 20 % does not cause abnormal deterioration of the engine or abnormal changes in engine power and exhaust gas.

The purposes of improving air pollution and suggesting energy resources have intensified research on various alternative energy for diesel combustion engines to solve severe environmental influences caused by air pollution. In this study, the applicable possibility of biodiesel and oxygenates (EGBE) was investigated as a cuspy method on decreasing the smoke emission. The smoke emission of blending fuel (biodiesel and EGBE) was reduced in comparison with commercial diesel fuel and it was reduced almost 63% at 2000 rpm, full load. But torque and brake specific energy fuel consumption rate didn't have any large changes. Also, the effectiveness of exhaust gas recirculation (EGR) for the reduction of NOx emission has been investigated. It was shown that simultaneous reduction of NOx and smoke emission was achieved with biodiesel(90%), oxygenates (10%) and cooled EGR rates (10%) in an IDI diesel engine.

In this study, the applicability of biodiesel fuel was investigated as an hopeful alternative fuel for a compression ignition engine. The exhausted smoke emission of biodiesel fuel was reduced remarkably in comparison with commercial diesel fuel, that is, it was reduced approximately 64% at 2500 rpm, full load condition. And, torque, power and brake specific energy consumption rate did not showed significant differences. But, NOx emission of biodiesel fuel was slightly increased in comparison with the commercial diesel fuel. Generation of CO2 is considerably reduced by photosynthetic action in the course of growing biomass series plants, the material for biodiesel fuel.

In this study, the potential of biodiesel fuel and oxygenated fuel (ethylene glycol mono-n-butyl ether; EGBE) was investigated as an effective method of decreasing the smoke emission. The smoke emission of blending fuel (EGBE 0~20 vol-%) was reduced in comparison with diesel fuel and it was reduced approximately 64% at 2000 rpm, full load in the 20% of blending rate. But torque and brake specific energy consumption (BSEC) didn't have large differences. Also, the effects of exhaust gas recirculation (EGR) on the characteristics of NOx emission has been investigated. Consequently, it was found that simultaneous reduction of smoke and NOx was achieved with biodiesel fuel and oxygenated fuel(10%) and cooled EGR rates (5~10%) in a DI diesel engine.