Over the past decade, regulations for mobile source emissions have become more stringent thus, requiring advances in emissions systems to comply with the new standards. For the popular diesel powered passenger cars particularly in Europe, diesel particulate filters (DPFs) have been integrated to control particulate matter (PM) emissions. Corning Incorporated has developed a new proprietary aluminum titanate-based material for filter use in passenger car diesel applications. Aluminum titanate (hereafter referred to as AT) filters were launched commercially in the fall of 2005 and have been equipped on more than several hundred thousand European passenger vehicles. Due to their outstanding durability, filtration efficiency and pressure drop attributes, AT filters are an excellent fit for demanding applications in passenger cars. Extensive testing was conducted on engine to evaluate the survivability and long-term thermo-mechanical durability of AT filters. Catalyzed filters were first tested to failure under severe uncontrolled regenerations to define filter survivability limits by means of filter maximum temperatures and thermal gradients. In the second phase filter durability was evaluated, exposing the AT filter to hundreds of high temperature regenerations. This paper demonstrates a broad window of operation for AT filters under extreme exposures. Furthermore the pressure drop as well as the filtration performance of the filters was investigated and compared to commercially available filter alternatives.
<div class="section abstract"><div class="htmlview paragraph">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.</div><div class="htmlview paragraph">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.</div></div>
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