It is very important to supply the diesel fuel from fuel tank to combustion chamber in case of cold start procedure. Paraffin hydrocarbons are easily solidified at low fuel temperature and it can block the fuel supply to the high pressure fuel pump. In order to reduce the fuel crystallization (Waxing), not only cold flow additives have been developed but also proper mounting design of fuel filter. Block heater in the fuel filter assembly have been also contained to improve the cold start and prevent blocking the fuel supply in Common Rail Direct Injection System. We need to make a test procedure of diesel cold flow evaluation to analyze the diesel cold flow characteristics. We can also obtain the design variables which have an effect to the diesel cold flow using the design of experiment and robust design. Finally the characteristics of diesel cold flow due to implementing cold flow evaluation test could be known.
In recent years there has been an increase in the number of vehicle start ability and operability issues during winter condition. Among the diesel cold properties, CFPP was generally used to provide a reference temperature for cold weather operability with diesel fuels for prediction of diesel cold performance. However, CFPP has been unlikely to have acceptable low temperature operability because of too much wax particles accumulated on the surface of the fuel filter in CRDI system. Otherwisely, preventing wax plugging of fuel filter in cold weather condition, cold flow characteristics should be also determined by fuel delievery system. The intent of this study was to find significant design variables for diesel cold performance and propose the cold performance index to predict the diesel vehicle cold weather problem by use of design of experiment.
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