Impact of Fuel Detergent Type and Concentration on the Rate and Severity of Stochastic Preignition in a Turbocharged Spark Ignition Direct Injection Gasoline Engine
Stochastic Preignition (SPI) is an abnormal combustion event that occurs in a turbocharged engine and can lead to fuel economy losses and engine damage, and in turn result in customer dissatisfaction. It is a significant limiting factors on the use and continued downsizing of turbocharged SIDI gasoline engines. Understanding and mitigating all the factors that cause and influence the rate and severity of occurrences is of critical importance to the engine’s continued use and fuel economy improvements for future designs. Previous studies have shown that the heavy molecular weight components in the fuel are one factor that influences the rate of Stochastic Preignition from a turbocharged SIDI gasoline engine. All of the previous studies have involved looking at the fuel’s petroleum hydrocarbon chemistry, but not specifically at the additives that are put in the fuel to protect and clean the internal components over the life of the engine.