The GTR-24 (Global Technical Regulation) by PMP (Particle Measurement Program) under the United Nations Economic Commission for Europe (UNECE) is published, even the First Amendment of it has been released.
EU 7 timeline is announced, the Brake Emission limits for Light Duty Vehicles are set, official publication is expected for mid of 2024.
There will be several approaches to get vehicles homologated in the future
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System optimization to reach low values regarding the “individual Friction Brake Share Coefficient)
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New technologies like Electromechanical Brake or Lamella Brakes
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New materials (disc and pad)
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Filter systems
The influence of recuperation on Brake Emissions is taken into account via so called Friction Brake Share Coefficients—depending on the degree of electrification. The foreseen possibility to create a vehicle specific iFBSC (individual Friction Brake Share Coefficient) gives some freedom to the OEMs utilizing strategy optimization.
Affected components will not only be software and functions, but also new brake system hardware like Electro Mechanical Brakes, with “true zero drag” and better controllability for brake blending—or integrated lamella brakes with no external emissions.
Another topic mainly again increasing testing efforts is the procedure for aftermarket parts.
Brake development will reach a new summit to get clean AND customer-friendly systems in the end, using more and more Simulation (e.g. Emission Modelling AI based)
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Next steps on legislation side
After the official announcement of the EU 7 the respective periods will start counting down.
In order to increase the confidentiality into the procedures and laboratories another Interlaboratory study has bee initiated by the Taskforce 3 within the PMP (Particle Measurement Program). It is containing a Pre Test to select the GTR-24 compatible labs willing to be part of the main “Round Robin”, which will most likely take place in Autumn 2024
In parallel the legislator will most likely start planning for RDE and ISC, maybe also for OBD
Truck brakes are the next to be regulated.
Tires
Another level of engineering will be caused by Brake Emission RDE Measurements, which are already announced within the GTR-24.
Truck regulations will be still more complex than passenger car ones as trucks have got a much wider range of applications. Actual topics are respective Cycles, Residual Torque and a possible calculation approach based on the Emission Legislation tool VECTO.
Implementation of ISC (In Service Conformity) is just a matter of time.
The first investigations on tire side have been kicked off—starting with abrasion.
