Performance of next generation Gasoline Particulate Filter materials under RDE conditions 2019-01-0980
In order to meet the challenging CO2 targets beyond 2020 without sacrificing performance, Gasoline Direct Injection (GDI) technology, in combination with charged aspiration, is expanding in the automotive industry. However, while this technology does provide a significant CO2 reduction, one side effect is an increased Particle Number (PN) emission. As a result, from September 2017, GDI vehicles in Europe are required to meet the stringent PN emission limits of 6x1011 #/km under the Worldwide harmonized Light vehicles Test Procedure (WLTP). In addition, it will be required to maintain a PN emission of 9x1011 #/km under Real Driving Emission (RDE) testing, which includes a Conformity Factor (CF) of 1.5 to account for current measurement inaccuracies on the road. Especially this introduction of RDE testing in Europe and China will provide a unique challenge for the design of exhaust after-treatment systems due to its wide boundary conditions.
Previous investigations have shown that Gasoline Particulate Filter (GPF) technology is an effective method to reduce PN emissions, with minimal impact on CO2 emissions. Due to increasingly stringent global emission requirements as well as the implementation of RDE testing conditions, it is critical to continuously develop and improve GPF performance.
This paper investigates the next development steps and iterations in GPF technologies which will result in improved fresh filtration performance while maintaining acceptable pressure drop levels. Potential development materials will be compared by looking at their performance under laboratory and RDE conditions.
Fumihiko Yoshioka, Kyohei Kato, Takashi Aoki, Mikio Makino, David Waters, Henry Jahnke, Frank Striebel
NGK Insulators, Ltd., NGK Insulators Ltd, NGK Europe GmbH