1. PN Counting from Raw Exhaust via Fixed Dilution and PMP Round Robin Project
JRC and ACEA

2. Current status
Interest in this approach confirmed by some engine manufacturers and some instrument manufacturers
01 Series of amendments to Reg. 132 already includes such possibility but the procedure is not defined
First analysis of potential benefits/issues presented during the last meetings
Correlation with other methods (CVS and partial flow system) and advantages/disadvantages to be checked – Additional data required

3. Current status Experimental program (Ricardo 37th PMP meeting)
Primary dilution (cold / hot)
Losses (thermophoresis, agglomeration)
Volatile removal efficiency (CS or ET)
Pressure effects
Time alignment
Interested parties are expected to generate data to be then discussed within the PMP group
Limited number of tests from JRC from PN-PEMS for HD program

4. Testing program Raw exhaust sampling Uncertainty vs CVS or PFDS
Robustness of systems
Technical specifications
Equations
Sub-23 nm

5. Testing program Commercial systems should be the base
Starting technical requirements from PFDS/PMP or PN-PEMS (eg distance to tailpipe etc)
Equations PN-PEMS (+uncertainty estimation)
CNG, DPF regenerations, high bio-fuels
Crankcase emissions connected to tailpipe
Instruments will be calibrated (especially 10 nm CPCs)

6. Scenario 1*
Evaluation testing at OEMs with JRC equipment in 2018 to address open issues
Feasibility decision and final technical specifications
Round Robin with Golden instrument(s) at tailpipe to evaluate repeatability and reproducibility of raw exhaust method with fixed dilution (no engine to circulate)
*assuming no availability of LD Golden instruments

7. Detailed evaluation program (OEM 1)
Instruments (minimum, in green provided by JRC)
PMP at CVS or PFDS (+10 nm JRC)
PMP at tailpipe (+10 nm JRC)
CS at tailpipe (JRC?) (+10nm JRC)
Daily protocol
WHTC cold, WHTC hot, WHSC, high temperature cycle, “pressure cycle”, WHTC hot
High temperature and pressure cycles could be short

8. Engine 1 (week one)
All 3 systems at the same sampling location (more repetitions necessary)
Systems 2 and 3 at tailpipe with PCRF high
Systems 2 and 3 at tailpipe with PCRF low
System 2 with longer sampling line
System 2 with different temperature at the sampling line or “pre-diluter” (if applicable)
Engine 2 (week two)
As above. The engine should be different technology or different aftertreatment concept or concentration levels. Or different fuel. Or different engine capacity

9. Detailed evaluation program (OEM 2)
Instruments as OEM 1
Daily protocol as OEM 1
Engine 1 (week one)
If OEM 1 used PFDS, CVS should be used.
Engine 2 (week two ) desirable
Final protocol decision after OEM 1 or OEM 2
OEM 3: 2-3 days confirmation testing
OEM 4: as above
OEM 5: as above…