Effects of Fuel Properties and Cold Start Conditions on HD Diesel Combustion and Emissions

Abstract

Future heavy duty diesel exhaust emissions are supposed to be regulated based on cold start and warm up emissions. Thus, diesel engine tests were carried out to investigate ignition, combustion and emission characteristics at low and normal coolant temperatures using fuels having different chemical properties and cetane numbers. The results show that low coolant temperatures and/or low cetane number fuels tend to delay combustion, resulting in influencing emissions characteristics particularly at low load.