Simultaneous Measurement of Emission Particles and Piston Surface Temperature in Direct-Injection Gasoline Engines

Abstract

The objective of this study is to clarify the particulate emission characteristics of a direct-injection gasoline engine. Because one of the main exhaust particle formation processes is pool combustion of the fuel film attached to the piston surface, the particulate number concentration and the temperature of the piston top surface were simultaneously measured to investigate the effect of the piston surface temperature on the particulate emission characteristics. It was found that the particulate number concentration and particle size increase with decreasing the piston surface temperature.