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Sub<23 nm Particles Key Messages

Transmitted by the PMP Chair. Informal document GRPE-68-21 ( 68 th GRPE, 7-10 January 2014, agenda item 7 ). Sub<23 nm Particles Key Messages. Document discussed in the PMP meeting 08 Jan 2014. Overview. Particles < 23nm are partially measured today

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Sub<23 nm Particles Key Messages

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  1. Transmitted by the PMP Chair Informal document GRPE-68-21 (68thGRPE, 7-10 January 2014, agenda item 7) Sub<23 nm Particles Key Messages Document discussed in the PMP meeting 08 Jan 2014 PMP-29-02

  2. Overview • Particles < 23nm are partially measured today • The system today works well and is applied across the industry • Light duty • Heavy duty • Extension to NRMM underway PMP-29-02

  3. Particle size / composition • Existing technologies (eg GDI) do not have significantly smaller particle size range than diesels with DPF • Some particles < 23nm on GDI sometimes identified but only at certain specific conditions. The percentage not measured is typically <60% (on average 30-40%) and comparable to diesels (<20%) • We do not know what these particles are – physically or chemically – more work required PMP-29-02

  4. Measurement Equipment - PNC • PNC could be adapted to measure particle size down to 10nm • Current PNC could NOT be adjusted to measure below 10nm. Different model is necessary. It is not as simple as plug and play. PMP-29-02

  5. Measurement Equipment - VPR • VPR Evaluated as not robust to measure down to either 10 or 3 nm today (volatile artifacts are common) • Alternative could be catalytic stripper • Catalytic stripper has also some issues to overcome • Calibration of VPR and determination of transfer functions / losses will be a further issue • Uncertainty of measurement expected to increase when solid sub-23nm particles exist. PMP-29-02

  6. Calibration • ENV-02 recommended ‘not a soot like aerosol’ for calibration – but has not suggested what should be done instead. • Calibration significant challenges for reference CPC (would need to be calibrated to lower particle size). Potentially all calibration to be done by electrometer – fundamental PMP-29-02

  7. Recommendations / Next Steps • No urgent need identified to revise measurement to < 23nm today. • New / emerging technologies to be kept under review regarding <23nm particles. • EU Com requested PMP to continue to develop a robust < 23nm method in case of future need. • PMP will develop a plan and timeline • Guidelines to avoid artefacts to be developed when measuring <23nm particles • With the above recommendations, the work on regeneration measurements for LD vehicles can start. PMP-29-02

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