Technical Paper
Evaluation of Techniques for Transient PM-Measurements
2008-06-23
2008-01-1680
PM-emissions during a load transient have been measured regarding particle mass, exhaust transparency and particle number concentrations in different size ranges. The load transient was from low to medium load at constant speed and was performed with a single cylinder research engine. Mass measurements were conducted with a Tapered Element Oscillating Microbalance. Exhaust transparency was measured with an Opacimeter. Particle Number Concentrations were measured with two different Condensation Particle Counters, CPCs, where one of them was equipped with a Particle Size Selector, PSS, in order to distinguish accumulation mode particles from nucleation mode. An Engine Exhaust Particle Sizer, EEPS, was also used in parallel with the CPCs and provided a full size distribution. For dilution, a rotating disc diluter and a two stage ejector diluter was used. In total two stages of hot dilution and one unheated.