Technical Improvements of Portable Emissions Measurement System for Solid Particle Number Larger than 10 nm

Since the introduction of the first Particle Number (PN) regulation for solid particles larger than 23 nm (SPN23) in the European Union (EU), the trend to introduce and strengthen PN regulations has spread globally. PN was added to the regulated components in the European Real Driving Emissions (RDE) regulation in 2017. Furthermore, the scope of the EU regulation will be expanded to include solid particles larger than 10 nm (SPN10) in the future. The authors have previously developed a Portable Emissions Measurement System (PEMS) capable of measuring SPN23. Since measurement of 10 nm PN by PEMS will also be necessary in the future regulations, The authors developed a 10 nm PN-PEMS. In this paper, the technical improvements and the basic performance of the developed 10 nm PN-PEMS are described. The results of SPN10 measurement tests which have been performed on different kinds of vehicles are presented. The developed 10 nm PN-PEMS showed good correlation with a stationary SPN10 measurement system.