The measurement of brake dust particles is a complex challenging task owing to the open configuration of a brake system; indeed, the emitted particles are directly spread into the environment. The experiments conducted on the inertia brake dynamometer feature controllable and reproducible environmental and load parameters. However, laboratory testing does not allow reproducing the external continuously changing conditions (i.e. traffic condition, driving style, air humidity, vehicle components’ wear and ageing, etc.), which affect the real driving emissions. To this effect, real driving emissions tests aim at assessing the vehicle global emissions in real driving environment and comparing brake particle emissions with other particle emitters, especially the combustion engines. Although real driving emission (RDE) tests enable the detection of brake dust particles emitted in real driving conditions, they are complex and not reproducible due to external, continuously changing parameters. The motivation lies in developing a real driving emission sampling system for brake particle emissions, which meets the quality requirements of the measurements, as well as the prevention of particle losses and contamination, thereby supplementing and reviewing laboratory-based procedures. In addition, a methodology is presented, which allows for the analysis of particle behavior and particle deposition using computational fluid dynamics.
David Hesse, Technische Universität Ilmenau, Germany; Klaus Augsburg, Toni Feißel, Jochen Sommer