Next Generation Gasoline Particulate Filters for Uncatalyzed Applications and Lowest Particulate Emissions 2021-01-0584

With the introduction of EU6d and CN6 all vehicles with gasoline direct injection and many with port fuel injection engine will be equipped with a gasoline particulate filter (GPF). A range of first generation filter technologies has been introduced successfully, helping to significantly reduce the tailpipe particulate number emissions. The continued focus on particulate emissions and the increasing understanding of their impact on human health, combined with the advanced emission regulations under RDE conditions results in the desire for filters with even higher filtration efficiency, especially in the totally fresh state. At the same time, to balance with the requirements on power and CO2, limitations exist with respect to the tolerable pressure drop of filters.

In this paper we will report on a new generation of gasoline particulate filters for uncatalyzed applications. This new generation of filters has been developed to enable very high filtration efficiency, in most cases above 90%, even in the totally fresh state and over aggressive drive cycles. At the same time the associated pressure drop penalty of these new technologies is moderate and under many practical conditions comparable to Gen 1 technologies. The performance of the new filter technology will be discussed based on experimental data obtained on several vehicles and under different emission cycles. The robustness of the new technologies will be assessed based on data generated on engine bench and real world mileage accumulation on public roads.