PMPN Report to WLTP DTP 16 Jan 2013 Prepared by Caro Hosier Post 14 and 15th WLTP PMPN Meetings audio / web conferences

CONTENTS 1.VALIDATION 2 ISSUES 06 Dec Post-test filter weights PM (Phil Price / weighing team 2.Reference filter (Phil Price / weighing team) 3.Tunnel Background (Les Hill / dilution systems team) 4.Evaporation tube temperature (Caro Hosier / PN team) 5.Regeneration – (Francesco / Thannassis JRC) 2.PMPN INPUT ON LAB-PROC ICE ISSUES 06 Dec 2012 – to be continued 1.Effect of regeneration within an 3-phase cycle L-M-H? 2.Did VP2 evaluate data for 3-phase cycle with separate xH Filter in regard to pm? 3.What is the effect on Ki-factor in a 3 phase cycle procedure? 4.Measurement tolerance of PN 5.Measurement tolerance of PM 3.ANNEX 6 DRAFTING ISSUES 13/14 Dec Preconditioning vehicle cycle 2.‘Equivalent’ PN background 3.Max PN background threshold 4.Regeneration 5.Filter Conditioning before test 6.Annex 6 section Annex 6 section Annex 6 section Reference filter weighing

CONTENTS continued 4.ANNEX 5 DRAFTING ISSUES 13/14 Dec Preconditioning vehicle cycle 2.‘Equivalent’ PN background 3.Max PN background threshold 5.Calibration Guideline update timing 6.Next meetings

Open Issues –VP2 IssuesDiscussion pointsStatus 1 Post-test filter weights PM VP2 data - Phil Price / weighing team Teflo filters not examined. CARB use teflo and have 30 minute standard. VP 2 data supports 1 hour conditioning time post-test for filters on TX-40. PMPN Chair to communicate data / draft proposal to Japan for comment. 2 Reference filter (weighing room quality check) VP2 data - Phil Price / weighing team CARB data if available 1-15 days proposed for rolling average as a result of VP2 data. 3 Tunnel Background PM and PN VP2 data - Les Hill / dilution systems team PN background: Further data reviewed.- revised proposal for limit – see Annex 6 OIL. PM background: proposal accepted subject to further confirmation testing re impact of regeneration 4 Evaporation Tube temperature VP2 data – Caro Hosier / PN team Data available from only one lab. No reported issues from instrument manufacturers. Proposal for 350+/- 10 deg C adopted 5 Regeneration investigations VP-2 Christos / Thannassis JRC PMPN recommends that PMP group is requested to include regeneration measurements with the investigations sub 23nm and a final conclusion is drawn from the PMP activities. 4 CLOSED CLOSED CLOSED

Open Issues –Input Lab-Proc ICE IssuesDiscussion pointsStatus 1 Effect of regeneration within an 3-phase cycle L-M-H? a)Data ?Not part of VP2. PMPN agreed separate study must be discussed. Study could be designed to deliver answers to 1) and 3). 2 Did VP2 evaluate data for 3- phase cycle with separate xH Filter in regard to pm? a)VP2 data ? PMPN recommends single measurement. EU Com DG-ENTR supports (see EU WLTP positions Nov 2012). VP2 data inconclusive – but not ideally recommended from uncertainty perspective to split measurements. For further discussion and review of labs with 3 phase measurement when MCTF proposals available. 3 What is the effect on Ki-factor in a 3 phase cycle procedure? a)Data ? Not part of VP2. PMPN agreed separate study must be discussed. Study (desktop or actual testing) could be designed to deliver answers to 1) and 3) 4 Measurement tolerance of PN? (relates to 1-3 tests requirements at cert) a)VP2 Data –see document PMPN to review the tolerance calculations and how this looks when split by emission level. Further discussion required. 5 Measurement tolerance of PM? (relates to 1-3 tests requirements at certification) a)VP2 Data –see document PMPN to review the tolerance calculations and how this looks when split by emission level. Further discussion required. 5

Open Issues – Annex 6 IssuesDiscussion pointsStatus 1 Preconditioning vehicle cycle Is anything specific required for PM/PN ? Draft proposal: nothing specific required for PMPN 2 PN background max subtraction ‘equivalent’ to xxx #/km Is the word ‘equivalent’ necessary ? YES measured in concentration and corrected to #/km via calculations involving flowrate, distance etc 3 PN background max subtraction equivalent to xxx #/km Is this the correct value ? Background PN data required. First proposal of 2E+9 #/km is 0.3% approx of todays EU diesel PN limit value. Consider the 0.5 particles/ccm limit given in the R83… Particle Number System Check Procedures (the particle counter shall report with a HEPA-filter at the inlet). Going up with the dilution rate (PCRF ~ 2000) needed for DPF regeneration measurements this 0.5 particles/ccm noise at the CPC corresponds to about 1.5x10^10 particles/km NEDC. 1.5x10^10 particles/km maximum tunnel background is 2,5 % of the Euro6 PN-lim it To be reviewed again with PMPN group. 6 CLOSED CLOSED

Open Issues – Annex 6 IssuesDiscussion pointsStatus 4Regeneration Is there a need to specify a minimum recommended distance post regeneration to rebuild soot cake ? Recommend minimum >2 or 3 cycles To be checked with PMPN group 5 Measurement Filter paper conditioning before test Drafting options to be discussed Issue closed. Only the sealed petri dish option with 8 hours should be allowed. 7 CLOSED

Open Issues – Annex 6 IssuesDiscussion pointsStatus 6 Annex 6 section PM sampling a)PMPN final sign-off required 7 Annex 6 section PN sampling a)PMPN final sign-off required 8 Annex 6 section PM sampling a)PMPN final sign-off required 9 Reference filter weighting a)Japan questions need for rolling average. PMPN data requested to provide to Japan. 8

Open Issues – Annex 5 IssuesDiscussion pointsStatus 1 Page 41 - Figure 15 redundantPage 41 - Figure 15: A recommended particle sampling system - is redundant. Figure 7 page 37 with same under title is sufficient. 2 Page 41 paragraph : The Determination of the transformation time of the particle number sampling system is not reasonable for PC testing because of the use of a full flow CVS-system. 3 P 49 : : The counting efficiency of the PNC should be monitored for deterioration with a limit of +/- 5% against reference PNC etc.. This limit is not scientifically sound because the demanded counting accuracy of a PNC is +/- 10% see paragraph Either the counting accuracy of the PNC in general is changed to +/- 5% or the PNC monitoring value has to be changed to +/- 10% 9

1.EMRP activities (Hans-Georg Horn) 2.ISO activities (Hans-Georg Horn) 3.JRC VPR RR final report 1.Final report due Dec Calibration Guideline Document 1.CSH to check copyright with Calibration Guidelines with AEA Technology (Ian Marshall) 5.Related issues 1.Impact of measuring during regeneration on stringency of calibration protocols 2.Impact of PMP considerations regarding lowering 50% cut off below 23 nm 6.Calibration Guideline update timing 1.To be developed in conjunction with other issues 5-0. Calibration guidelines All Calibration issues held over for discussion at PMPN session in early 2013

2013 PMPN Major Activities Date TBE : WLTP DTP meeting 16 Jan 2013 : further discussions to close remaining Open Issues Date TBE : Full review of Annex 5 and 6 GTR draft Date TBE : Calibration / Calibration guideline issues (see agenda item 5) Date TBE : Planning regeneration and Ki mode construction study with DTP if needed Date TBE : Follow up with UN-ECE PMP group re progress on <23nm 50% cut off 6-0. Next Meetings / Activities