Abstract
In-cylinder total gas sampling technique has been developed by using hydraulic variable valve actuation system. PM (Particulate Matter) included in the sample gas was trapped on quartz filter, and PAHs (Poly-Aromatic Hydrocarbon) components and soot were quantified by TD-GC / MS (Thermal Desorption Gas Chromatograph Mass Spectrometry) and carbon analyzers, respectively. Cylinder-averaged histories during / after combustion were obtained by changing the sampling timing. PM formation processes were analyzed by using this technique.