Particle number emission tests with China Ⅴ diesel fuel were conducted on a Euro Ⅵ diesel engine equipped with DPF in ESC

ETC

WHSC and WHTC tests. Results show that during the transient processes of those tests

the large absolute peaks of the engine’s exhaust back pressure change rate result in instantaneous peaks of the exhaust particle number concentration although the exhaust gas is purified by DPF. The number of particles in the average diameter range of 50nm to 80nm accounts for 90% of the total number of particles emitted over the ESC test cycle

while the number of particles in the average diameter range of 60nm to 110nm accounts for 87% of the total number of particles emitted over the WHSC test cycle. The number of particles in the average diameter range of 10nm to 70nm accounts for 80% of the total number of particles emitted over the ETC test cycle

while the number of particles in the average diameter range of 10nm to 40nm and 50nm to 60nm accounts for 85% of the total number of particles emitted over the WHTC test cycle.