Fuel component had more significant effect on HC and CO emissions in low and middle load.With the ethanol percent increase in oxygenated fuel, the HC and CO emissions increased.

• 含氧燃料成分在中低负荷下对HC和CO的排放影响较大，随着含氧燃料中乙醇比例的增加HC和CO排放增加，在中高负荷下，三种燃料的HC和CO排放基本相当；