1. WLTP-DTP Subgroup Additional Pollutants VP2 Results
Date: 10. Dec. 2012
WLTP-DTP-AP, Mörsch/Astorga

2. Validation NO2 Measurement
So far, additional data from 6 labs received:
11 Vehicles
157 Tests with modal and bag results for NO
All labs used CLD
Data is sufficient to close open issue
Analysis
Vehicles
Repititions
UTAC
VP2
CLD 6 3
IAV GM
ACEA 2
TÜV
no modal data
DEKRA
EMPA
Bosmal
no answer
Maruti
Korea
WLTP-DTP-AP, Mörsch/Astorga

3. NO2: Open Issue
Should measurement of NO or NO2 from bag be allowed as alternative to modal measurement?
WLTP-DTP-AP, Mörsch/Astorga

4. NO2: measurement from bag versus modal measurement
Measurement from bag systematically yields higher concentration of NO2
This is due to the reaction of NO to NO2 in the bag
 To avoid error modal measurement is required
WLTP-DTP-AP, Mörsch/Astorga

5. NO2: Repeat Measurements
Repeat measurements (3 to 6 tests) show identical scatter for bag and modal measurement of NO
WLTP-DTP-AP, Mörsch/Astorga

6. NO2: Zero scatter
Basis: 96 results from vehicle with very low NO2 emission
Scatter from modal measurement smaller than from bag
Concentration ca. 0,1 ppm higher
 Modal measurement is reliable
WLTP-DTP-AP, Mörsch/Astorga

7. NO2: Conclusion
To avoid significant systematic error due to reaction in the bag modal measurement is required
Modal measurement is almost as robust as bag measurement
WLTP-DTP-AP, Mörsch/Astorga

8. Validation N2O Measurement
Only few labs have submitted data
No measurements of two systems in parallel
Data is not sufficient for validation but no open issues
WLTP-DTP-AP, Mörsch/Astorga

9. Validation NH3 Measurement
Only few labs have submitted data
Only few measurements of two systems in parallel, no correlation
Data is not sufficient to close open issues
WLTP-DTP-AP, Mörsch/Astorga

10. Open issues for NH3 sampling and measurements
In Situ extractive Approach to solve
Sampling during engine off x xx  request to labs to collect data
Lost sample x  theoretical approach
Go to diluted measurement?  open issue
Addition of diluent x  diluent according spec for pure gases
Calibration x
Loss of NH3 in sample system x  best practice/literature
Temperature of analyser (FTIR) x  technical discussion
Temperature condition x  best practice/literature
Temperature and material x  best practice/literature
of sampling lines
Filter material x  best practice/literature
WLTP-DTP-AP, Mörsch/Astorga

11. Validation of measurement of EtOH and Aldehydes
No data from VP2
Additional measurement campaign necessary
At least two weeks, ca. sept (depending on availability of instruments)
JRC will host (to be confirmed)
Instrument manufacturers methods:
AVL
Horiba
Innova (to be verified)
MAHA
Sensors
GC-Method
FTIR
Call for instruments (on CIRCA)
Vehicles: 2 different FFV, 2 Gasoline
WLTP-DTP-AP, Mörsch/Astorga