抄録
The deposits are produce on the combustion chamber wall, when the engine is operated for a long time. The deposits on the combustion chamber wall adsorb the fuel during the intake and compression stroke, and discharge it during the expansion and exhaust stroke. This phenomenon increases HC emission from the spark-ignition engine. In this paper, how the deposit on the piston surface artificially produced affects the emission of HC, is clarified experimentally. The result of the measurement shows that the HC discharge from the deposit is important under the cold-start.
