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Analysis of the Emission Conversion Performance of Gasoline Particulate Filters Over Lifetime
- Stefan Sterlepper - RWTH Aachen University ,
- Johannes Claßen - RWTH Aachen University ,
- Stefan Pischinger - RWTH Aachen University ,
- Christof Schernus - FEV Europe GmbH ,
- Michael Görgen - FEV Europe GmbH ,
- Jim Cox - FEV Europe GmbH ,
- Martin Nijs - FEV Europe GmbH ,
- Johannes Scharf - FEV Europe GmbH ,
- Dominik Rose - Corning GmbH ,
- Thorsten Boger - Corning GmbH
ISSN: 2641-9637, e-ISSN: 2641-9645
Published September 09, 2019 by SAE International in United States
Citation: Sterlepper, S., Claßen, J., Pischinger, S., Schernus, C. et al., "Analysis of the Emission Conversion Performance of Gasoline Particulate Filters Over Lifetime," SAE Int. J. Adv. & Curr. Prac. in Mobility 2(2):710-720, 2020, https://doi.org/10.4271/2019-24-0156.
Gasoline particulate filters (GPF) recently entered the market, and are already regarded a state-of-the-art solution for gasoline exhaust aftertreatment systems to enable EU6d-TEMP fulfilment and beyond. Especially for coated GPF applications, the prognosis of the emission conversion performance over lifetime poses an ambitious challenge, which significantly influences future catalyst diagnosis calibrations. The paper presents key-findings for the different GPF application variants. In the first part, experimental GPF ash loading results are presented. Ash accumulates as thin wall layers and short plugs, but does not penetrate into the wall. However, it suppresses deep bed filtration of soot, initially decreasing the soot-loaded backpressure. For the emission calibration, the non-linear backpressure development complicates the soot load monitoring, eventually leading to compromises between high safety against soot overloading and a low number of active regenerations. In the second part, a relevant share of ash deposits inside three-way catalysts (TWC) is depicted. In an experiment, the oxygen storage capacity (OSC) of a three-way catalyst was significantly lowered by ash, while a coated GPF showed little effects. A subsequent OSC regeneration of the TWC showed that the OSC drop is not necessarily permanent, reducing the selectivity between full useful life and borderline catalysts.