Brake Wear Particulate Matter and Mitigation Strategies

Dear Colleagues,

Non-exhaust particle emissions (including tyre, road, and brake wear) are projected to be dominating particle emissions from road traffic at least when modern vehicle fleets are examined. Exhaust particle emission levels are regulated and were significantly reduced in the last decades. In contrast, non-exhaust emissions are expected to further increase due to the increase in traffic. In this context, the United Nations Economic Commission for Europe World Forum for Harmonization of Vehicle Regulations (UNECE WP.29) has decided to develop a Global Technical Regulation on brake emissions from light duty vehicles. At the same time, the EU plans to include brake wear particle emissions in the upcoming EURO 7 emission standards legislation.

This special issue is trying to summarize the current state-of-the-art in the field of brake wear particle emissions. This includes basic research of the tribological formation mechanisms, progress on standardization efforts for measuring Particle Mass (PM) and Particle Number (PN) emissions from different types of brakes in a repeatable and reproducible way, as well as the influence of brake wear mitigation measures. Here, a special focus is given on regenerative braking and its potential to reduce PM and/or PN emissions compared to fully conventional ICE vehicles. Finally, the influence of possible future technologies in reducing brake emissions will be examined.

Dr. Marcel Mathissen
Dr. Theodoros Grigoratos
Guest Editors

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