EXTENSIVE CHARACTERIZATION OF DIESEL PART ICULATES FOCUSED ON THEIR EFFECT

An extensive particulate characterisation of diesel exhaust in two cas e studies is presented. The characterisation compromises the measureme nt of the size distribution, a morphological examination by Scanning E lectron Microscopy, the determination of the chemical composition and the determination of all mass emissions. A first set of experiments in vestigated the influence of an oxidation catalyser, the charge-air coo ler and the power at the carwheel on the particulate emissions. A seco nd set of experiments investigated the influence of sampling condition s, humidity of the combustion air and the effective engine power on th e particulate emissions. We found the size distributions measured to b e dependent partially on engine power and changing with each engine. U nder all experimentally realised conditions 95% of all particles were found in the size region of 10 to 500 nm. The morphology of the emitte d particles were basically identical for all engines tested. As expect ed the chemical composition and the mass emissions of diesel particles were dependent of the whole combustion system and the boundary condit ions in a complex way.