| Particle Measurement Programme: Minutes of the 55th (July 2025) session |
| Reference Number: PMP-55.1-13 |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 15 Jul 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
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| PMP TF5-SG2 updates on GTR HD brakes: Cycles |
| Reference Number: PMP-55.1-12 |
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TF5-SG2 update on GTR HD brakes test cycle development. Phases include analysis of measured brake cycles from real world data, adjustment of VECTO driver model to meet real world distributions, integration of endurance brake model, and shortening VECTO mission profiles to test cycle candidate. SG2 decided to use VECTO cycles as basis, resulting speed cycle for optimisation, and cycle without road gradients. Next steps include elaborating method to calculate torque and rpm from speed cycle, further shortening cycle to approximately 4 hours, and testing cycle to elaborate quality criterion for reproducibility. Volume flow settings on HD brake dynos require elaboration in SG1. |
| Submitted by: TU Graz |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 10 Jul 26 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
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| GTR 24: Changes and improvements |
| Reference Number: PMP-55.1-08 |
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ILS 3 Findings and GTR 24 Updates addresses improvements to the Particle Measurement Programme. References to three-probe layout and smaller duct diameters are deleted; duct inner diameter is defined as 190–225 mm. A column defining numbers of decimals is added to Table 8.1. Bedding and emissions measurement sections shall use new parts. Temperature requirements at filter holder are clarified to remain above 15°C. Requirements on decimal places are added throughout Tables 13.1, 13.3, 13.4, 13.5, and 13.6. Table 13.6 now counts from 1 to 274. Unit notation is harmonized. Signal filtering requirements are added to Chapter 5.4. Various requests are rejected, including repositioning sampling nozzles and probes, PM₁₀ probe positioning, and OEM-declared threshold pressure values. |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 10 Jul 26 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
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| GTR 24: Extend the TBF export for 5 seconds |
| Reference Number: PMP-55.1-04 |
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PM samplers must sample continuously until 10 seconds after the end of the WLTP, as particles require 10 seconds to reach the filter after the last brake event. PN calculation does not completely cover all PN of the trips’ last brake event due to time delay and smoothing during the calculation period. Based on ILS data, extending the TBF export by 5 seconds would result in maximum emission factor differences of approximately 0.35 percent, estimated below 1 percent overall influence. |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 10 Jul 26 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
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| PMP Task Force 5 Status Report |
| Reference Number: PMP-55.1-08 |
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PMP Task Force 5 is working on HDV Brake Dyno Layout and HDV Brake Test Cycle. A GTR proposal is planned by the end of 2025. |
| Submitted by: JRC |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 10 Jul 26 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |