Abstract
Histories of PM and PN, which is regulated in Europe, over DPF regeneration period were measured from the most recent HD vehicle. PM exhibited a slight high emission during the regeneration. PN with the regeneration cycle was quite high and reduced drastically as the test cycles proceeded. The certification value of a vehicle with periodically DPF in EU is the average in whole the regeneration period, and 16 % of estimated certification PM from this study was derived from the cycle with the regeneration. 99 % of estimated PN certification value is derived from 3 cycles from the regeneration. The real time observation of PN indicates that the high emissions during and after the regeneration arose by the drop of filtering efficiency due to decreasing particles in DPF by the oxidation.
