Particle Emission Reduction in a SI-DI Vehicle by an Open Channel Filter

Euro 6 PN limit for diesel vehicles. Open channel particle filters are used to reduce diesel exhaust PM and PN emissions. These devices cause typically only low back-pressure increases and do not require an active regeneration system, which are clear benefits when the operation of open channel filter is compared to wall-flow filters. In addition, due to the development and new structures, the particle emission reduction efficiencies have increased even up to 80%, slightly depending on the solution and e.g. the engine out particle size distribution. Especially the smallest solid exhaust particles can be reduced efficiently by these devices. In addition to diesel applications, open channel filters offers one approach to reduce the emissions of SI-DI vehicles. In this study, we conducted exhaust particle measurements for SI-DI vehicle with and without open channel filter (Particle Oxidation Catalyst, POC), in order to clarify its effect on exhaust solid particle size distribution and solid particle number.