This paper focuses on the effects of internal and cooled external exhaust gas recirculation (EGR) on the combustion and … smoke emissions HCCI. Internal and external EGR are combined to control the combustion. Internal exhaust gas recirculation …. Cooled external EGR can delay the start of combustion (SOC) effectively, which is very useful for high cetane fuel (diesel …

recirculatoin (EGR) on combustion and emission during cold start were investigated. Combustion of first firing cycle can be promoted … combustion (SOC) was also much earlier. EGR also had effects on combustion stability. In the case, which kept 50% or 100% opening … of EGR valve (OEV) and kept 100% opening of choking valve (OCV), more stable combustion process was achieved when common …