Abstract
This paper presents an investigation into the effect of exhaust gas recirculation on the particulate and its component emissions in a direct injection diesel engine. A hot EGR was applied to a single-cylinder 3L engine at a constant speed of 900rpm over a wide range of operating condition. EGR was revealed to have an effect of particulate suppression under some condition, and the suppression effect came from the reduction in the SOF component. This EGR effect is considered to be caused by the dilution of the intake gas with the recirculated gas which was suggested by the ignition delay measurement.
