Abstract:An on used common rail diesel engine which met the national standard III of China was used as the test prototype, and the number and size distribution characteristics of ultrafine particle of the diesel engine fueled with China II and Shanghai IV diesel were carried out respectively under Europe steady state cycle (ESC), by using an engine exhaust particle sizer (EEPS). The test result shows that the particle number emission of the diesel engine fueled with either China II or Shanghai IV diesel at A, B, and C speed cases of ESC reduces respectively as the load increases. The exhausted particle size distribution of the engine fueled with China II diesel is obviously in bimodal logarithmic distribution whereas it is in unimodal logarithmic distribution when the engine is fueled with Shanghai IV diesel under ESC except for idle case. Compared with China II diesel, the total ultrafine particle number emission, the nucleation mode particle number emission of the diesel engine reduce together, while geometric mean diameter of the exhaust particle becomes larger. Therefore, the engine’s nucleation particle number emission reduces obviously when the engine is fueled with Shanghai IV diesel.
