Investigations of Process and Component Parameters for the Number of Particles and Size Distribution of a Supercharged DI-SI Engine
2022-01-0700
03/29/2022
- Event
- Content
- Due to the short mixture formation times in the direct injection of modern gasoline engines, there is an increase in the emission of undesirable particle emissions in gasoline engines. As a result of previous studies with a portable emission measurement system (PEMS) of raw emissions and cleaned emissions, the particle number (PN) of the sampling point after the catalyst was higher than before the catalyst at the same process parameters and engine operating points. Based on this reproducible phenomenon, several theories were proposed. The theories set up dealt on the one hand with the question of process control with regard to the formation of particles, but also fundamentally with the question of whether conventional exhaust gas aftertreatment systems (3-way catalytic converters) are suitable for influencing the number of particles. In addition, studies of the oil consumption via the blow-by system and its influence on particle emissions also played a role. To verify these theories and to investigate the influence of the catalyst on the PN and the particle distribution (PD), several series of measurements were taken. In general, the investigations and measurements cover process and component related topics. Specifically, the authors combined several measurements of injection parameters such as high pressure rail injection pressure and onset of injection (SOI) at steady state operating points. Further investigations were conducted with the equivalence ratio and its effects on PN and PD before and after the catalyst, respectively. For the time-dependent PN measurement PN(t), the authors found a correlation between the AFR controller and PN. A final point is the investigation of the blow-by system with respect to PN and PD emissions in the raw emission. Optimization of this component can significantly reduce particulate emissions in direct-injection gasoline engines and thus contribute to improving air quality, especially in urban agglomerations.
- Citation
- Dost, T., Schambach, R., and Getzlaff, J., "Investigations of Process and Component Parameters for the Number of Particles and Size Distribution of a Supercharged DI-SI Engine," SAE Technical Paper 2022-01-0700, 2022, .