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Technical Paper

Effects of Oxygenates and Aromatics in Gasoline on Vehicle Particulate Emissions

There have been tremendous improvements in China fuel quality in recent years in conjunction of newly implementing vehicle emissions standards to combat air pollutions in China. As the focus of the concern in the particulate emissions on the gasoline engine with ever popular gasoline direct inject (GDI or SIDI) engines, China 6 emission standard introduces PM/PN requirements for all spark ignition gasoline vehicles. Furthermore, ethanol and aromatics are widely used as octane booster changing the structure of gasoline pool. Nevertheless, the composition of gasoline is one of the factors affecting PM/PN emissions. In this study, different gasoline samples with two oxygenates in ethanol and methyl tert-butyl ether (MTBE), and heavy aromatic hydrocarbons were studied on a vehicle with a GDI engines. Vehicle tests were performed on Worldwide Harmonized Light Vehicles Test Cycle (WLTC).
Technical Paper

Five Years Trend of Global Market Gasoline Quality Review using Fuel Particulate Emission Correlation Indices

Gasoline soot tendency has been extensively studied in last five years. Many tools has been developed to provide indications of a fuel’s sooting tendency. While some methods still have room for improvement, the tools can be used to qualitatively assess the fuel quality in markets. This paper will review the most recently developed methods, with good correlation agreement to vehicle particular emission tendency, that could be used to give indication of the sooting tendency of the gasoline range fuels, and last five years market trend as indexed by those tools. In addition, the paper will review and propose improvement of the methods on assessment of a gasoline range fuel’s sooting tendency. Areas around the globe where market gasoline range fuels are of concern will be highlighted, in coordination with the new emissions regulations.
Technical Paper

Influence of Ethanol and MTBE Proportion in China ⅥB Gasoline on Vehicle Particulate Emissions

With the implementation of China Ⅵ gasoline standards, the use of ethanol is expanding in China. The addition of ethanol in China Ⅵ gasoline is to further reduce emissions of gaseous and particulate matter. However, due to the constrain of biomass ethanol production, MTBE (Methyl tert-Butyl Ether) is still being used in addition of ethanol to improve fuel octane and maintain oxygen content. The impact of mixed oxygenates in fuel to vehicle emissions are studied in this paper. The correlation of fuel characteristics to vehicle particulate emission has been investigated, in particularly to well known fuel indices. Those include Honda’s particulate matter index (PMI), General Motor’s Particulate evaluation Index (PEI), and Toyota’s simplified particulate index (sPMI), etc.. The results from this study suggest some alternatives to existing fuel indices due to oxygenates contribution. In this paper, three direct-injection turbocharged models were used as the test vehicles.
Technical Paper

Fuel Effects on the Propensity to Establish Propagating Flames at SPI-Relevant Engine Conditions

In order to further understand the sequence of events leading to stochastic preignition in a spark-ignition engine, a previously developed experimental and analysis methodology was used to evaluate the propensity of fuels to establishing propagating flames under conditions representative of those at which stochastic preignition (SPI) occur. A large fuel matrix including single component hydrocarbons, binary and tertiary mixtures, and real fuel blends was evaluated. The propensity of each fuel to establish a flame was correlated to multiple fuel properties and shown to exhibit consistent blending behaviors. No single parameter strongly predicted a fuel’s propensity to establish a flame, while multiple reactivity-based parameters exhibited moderate correlation. A two-stage model of the flame establishment process was developed to interpret and explain these results.
Technical Paper

Development of an Alternative Predictive Model for Gasoline Vehicle Particulate Matter and Particulate Number

The Particulate Matter Index (PMI) is a helpful tool which provides an indication of a fuel’s sooting tendency. Currently, the index is being used by various laboratories and OEMs as a metric to understand the gasoline fuels impact on both sooting found on engine hardware and vehicle out emissions. This paper will explore a new method that could be used to give indication of the sooting tendency of the gasoline range fuels, called the Particulate Evaluation Index (PEI), and provide the detailed equation in its initial form. In addition, the PEI will be shown to have a good correlation agreement to PMI. The paper will then give a detailed explanation of the data used to develop it. Initial vehicle PM/PN data will also be presented that shows correlations of the indices to the vehicle response.
Technical Paper

Investigation of the Impact of Fuel Properties on Particulate Number Emission of a Modern Gasoline Direct Injection Engine

Gasoline Direct Injection (GDI) has become the preferred technology for spark-ignition engines resulting in greater specific power output and lower fuel consumption, and consequently reduction in CO2 emission. However, GDI engines face a substantial challenge in meeting new and future emission limits, especially the stringent particle number (PN) emissions recently introduced in Europe and China. Studies have shown that the fuel used by a vehicle has a significant impact on engine out emissions. In this study, nine fuels with varying chemical composition and physical properties were tested on a modern turbo-charged side-mounted GDI engine with design changes to reduce particulate emissions. The fuels tested included four fuels meeting US certification requirements; two fuels meeting European certification requirements; and one fuel meeting China 6 certification requirements being proposed at the time of this work.
Technical Paper

China Market Gasoline Review Using Fuel Particulate Emission Correlation Indices

The impact of gasoline composition on vehicle particulate emissions response has been widely investigated and documented. Correlation equations between fuel composition and particulate emissions have also been documented, e.g. Particulate Matter Index (PMI) and Particulate Evaluation Index (PEI). Vehicle PM/PN emissions correlate very well with these indices. In a previous paper, global assessment with PEI on fuel sooting tendency was presented [1]. This paper will continue the previous theme by the authors, and cover China gasoline in more detail. With air pollution an increasing concern, along with more stringent emission requirements in China, both OEMs and oil industries are facing new challenges. Emissions controls require a systematic approach on both fuels and vehicles. Chinese production vehicle particulate emissions for a range of PEI fuels are also presented.