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Future regulations for emissions will increasingly focus on reducing respirable particles, which are caused by abrasion from brakes, tires and roads. PMP (Particle Measurement Program) under the United Nations Economic Commission for Europe (UNECE) has already defined a measurement cycle together with international organizations to measure brake wear on brake dynamometers. Questions about the sampling method and details about the measurement are open.
This paper will focus on Brake Emissions as the regulations on the one hand are already on the way, and on the other hand the measuring methods are basically defined. Furthermore the central points are not chemical or legislative details, but a view from system and vehicle perspective.
However, the focus of the regulation is currently only on passenger cars with internal combustion engines, since the measurement process only records the emissions of the “brake” component, without taking into account recuperation, for example.
The exact definition of the limit values is still pending, but it can be assumed that they will be based on exhaust emissions of internal combustion engines.
There are numerous measures to reduce particle emissions, which either aim to generally prevent particle emissions from the brake or to filter the particles that have already been emitted.
As a result, the volume of tests relating to the brake will increase massively, as all variants have to be tested and certified. On the other hand, the necessary changes to the brakes are also affecting other properties of the entire vehicle, causing e.g. compromises between performance, emissions and comfort.
The automotive industry will then face a further increase in the challenges when considering tire and road abrasion emissions.
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go back to reference Photo credits: Cover © schank/Shutterstock.com Photo credits: Cover © schank/Shutterstock.com
go back to reference Mathissen, M., Grochowcs, J., Schmidt, C., Vogt, R., Farwick zum Hagen, F., Grabiec, T., Steven, H., Grigoratos, T.: Wear, vol. 414–415, pp. 219–226 (2018) Mathissen, M., Grochowcs, J., Schmidt, C., Vogt, R., Farwick zum Hagen, F., Grabiec, T., Steven, H., Grigoratos, T.: Wear, vol. 414–415, pp. 219–226 (2018)
go back to reference OECD: Non-exhaust Particulate Emissions from Road Transport: An Ignored Environmental Policy Challenge, OECD Publishing, Paris (2020). https://doi.org/10.1787/4a4dc6ca-en OECD: Non-exhaust Particulate Emissions from Road Transport: An Ignored Environmental Policy Challenge, OECD Publishing, Paris (2020). https://doi.org/10.1787/4a4dc6ca-en
go back to reference Jones, Stephen: Active Limitation of Tire Wear & Emissions for Electrified Vehicles, AVL, (2021) Jones, Stephen: Active Limitation of Tire Wear & Emissions for Electrified Vehicles, AVL, (2021)
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