Abstract
In recent years, the use of biofuels in the Electronic Diesel Control being interested by the scientists, fuel producers as well as consumers concise and factual abstract is required. However, the research idle speed control using biodiesel on common rail diesel engine have not been researched yet. This paper research and designs the idle speed control of engine diesel 2.5TCI-A HYUNDAI STAREX use biodiesel B20. The results show that the engine is operating normally idle speed, the engine using the idling controller reduces CO by 14.34%, HC by 19.2%, NOx by 70.54 % and PM unchanged compared to the original engine with the same fuel B20.