Characteristics of Particulate Matters in Gasoline Vehicle Exhaust

Abstract

This study investigated the characteristics of particulate matter (PM) in the engine exhaust emitted from four-stroke motorcycles and gasoline vehicles The emission factors of PM CO HC NOX were also estimated by emission tests Composition of PM includes carbon component water-soluble ions metals were also analyzed Test vehicles included six motorcycles and three gasoline vehicles Emission tests were under various engine speeds with controlled conditions The average PM concentration for motorcycles and gasoline vehicles were 0 218~0 887 mg/Nm^3 and 0 034~0 054 mg/Nm^3 respectively The average PM emission factor for motorcycles and gasoline vehicles was 0 410 mg/km and 0 108 mg/km respectively Lower concentration of PM was observed during idling mode and the concentration would decrease as increasing engine speed The results of test data were with confidence of CoV < 30% Results of PM composition showed that organic carbon (OC) and element carbon (EC) were the major components of engine exhaust particles The dominant compositions were carbon components (40~74%) water-soluble ions (0~9%) and metal elements (1~23%) respectively The ratio of OC/EC was around 1 27 NO3- SO42- and NH4+ were the major compositions of water-soluble ions group in the engine particles Fe Ca and Mg were the major metal elements in engine particles The OC ratio in particulate would be related to the engine speed

Date of Award	2020
Original language	English
Supervisor	Jiun-Horng Tsai (Supervisor)