Marine diesel engines can easily generate soot and SOF at starting and steam caused by the combustion for hydrogen in the fuel is condensed in the atmosphere. When marine diesel engines start, soot and SOF are primarily emitted as evaluation of exhaust emission characteristics. To evaluation of exhaust emission characteristics at starting, the experiment in this study used a small-sized marine diesel engine equipped with high accuracy PM measurements system was conducted. As a result, the followings objectives were clarified. (1) The quantitative evaluation of exhaust emission is possible by the continuous measurement of PM emission immediately after the starting. (2) A large amount of SOF is included in the evaluation of exhaust emission characteristics at starting. (3) PM emission and the temperature of cooling water have a correlation．
marine diesel engines
soot
SOF
PM emission
exhaust emission characteristics