<div class="section abstract"><div class="htmlview paragraph">Diesel Particulate Filters (DPF) are becoming mandatory for many Heavy Duty Vehicle (HDV) and Non Road Mobile Machinery (NRMM) applications as the requirement for particulate filtration performance has increased over this past decade. In a previous study, a new generation of cordierite DPF was developed to meet the latest major emission regulations; PN-PEMS requirement for EuroVI StepE, while maintaining a lower pressure drop and high ash capacity. Despite the improvements made in the latest generation DPF material, the introduction of tighter particulate regulations demands further improvement in DPF technology. More specifically, PN emission limits for Euro7 under wide operation conditions in conjunction with PN down to 10nm, as described in the proposal from Consortium for Ultra Low Vehicle Emission (CLOVE), requires further improvement in PN filtration performance. Pressure drop, which may negatively influence the CO<sub>2</sub> emissions, remains a key performance criteria. The DPF must also have high ash capacity per unit volume to ensure there is enough packaging space for the light off SCR, which is likely going to be essential in managing the severe NOx emissions limits. Furthermore, there is also the chance that other regions such as China and India may choose to adopt these stringent European regulations in an effort to achieve better air quality. To fulfill Euro7 requirement, DPF technologies will need to improve PN emission by more than one order of magnitude while sustaining equal or lower pressure drop and equal or higher ash capacity. This paper investigates the development of new generation Cordierite DPF, whose material concept was optimized to minimize both large and small pores to achieve a good balance between the trade-off performance of PN filtration and pressure drop. Both laboratory and engine bench tests were carried out to compare the performance of this state-of-the-art technology with the performance of the conventional material. The results are presented relative to the assumed Euro7 PN boundary conditions.</div></div>
<div class="section abstract"><div class="htmlview paragraph">The LDV gasoline emission regulation is set to be tightened for Euro7. In particular, the particulate number (PN) requirement has been significantly tightened requiring a GPF with extra - high filtration efficiency to meet the target requirement.</div><div class="htmlview paragraph">In order to meet the stricter PN requirements, GPF substrate material improvement is necessary. However, conventional GPF material improvement for high filtration efficiency will increase the filter backpressure significantly. The relationship between pressure drop and CO<sub>2</sub> emission is difficult to quantify but high pressure drop can potentially increase the CO<sub>2</sub> emission. Therefore, Membrane Technology (MT) is the key to break through the trade-off between filtration performance and pressure drop. MT is thin and dense layer of small grains applied on the GPF surface. MT application can increase particulate filtration efficiency significantly with minimal pressure drop increase. To make MT work effectively, membrane conditions need to be optimized. In addition, the effect of each condition on GPF filtration performance needs to be verified.</div><div class="htmlview paragraph">On the other hand, it is also important to maintain GPF filtration performance, membrane durability and robustness under all GPF operating conditions and Full Useful Life of the vehicle. In order to achieve the membrane durability and robustness, membrane grains need to be adhered to the GPF surface and GPF performance needs to be evaluated for all GPF operating conditions.</div><div class="htmlview paragraph">This paper shows the results of membrane technology optimization for maximizing GPF performance, particulate filtration performance of GPF with MT, and the durability performance of MT.</div></div>
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