1. WLTP-DTP Subgroup Additional Pollutants VP2 Results & Open Issues
Date: 12. Dec. 2012
WLTP-DTP-AP, Mörsch/Astorga

2. Data is sufficient to close open issue
Validation NO2 Measurement
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
Repetitions
UTAC
VP2
CLD 6 3
IAV GM
ACEA 2
TÜV
no modal data
DEKRA
EMPA
Bosmal
no data
Maruti
Korea
WLTP-DTP-AP, Mörsch/Astorga

3. 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
 modal measurement should be required to avoid error
WLTP-DTP-AP, Mörsch/Astorga

4. Validation NH3 Measurements
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

5. NH3-Measurement Issue: Available Proposals:
Measurement from raw exhaust influences subsequent CVS measurements
Not sufficient results from VP2
Available Proposals:
Limit sample flow and return bypass ( influence on small displacements may still be too high)
Additional test for NH3 ( workload)
Measurement from diluted exhaust ( so far no experience, difficulties expected)

6. Necessary for decision:
NH3 Measurement
Necessary for decision:
Postpone finalization of GTR for NH3 measurement till end of 2013
Way out:
Evaluation of diluted measurement
Include in AP validation Sept 2013

7. 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

8. Issue: Way out: N2O Measurement No technical issues foreseen
But not sufficient results from VP2
In industry evaluation has been performed
Way out:
Use data from industry programs to validate draft GTR

9. Measurement of EtOH and Aldehydes
Issue:
No data from VP2
New measurement methods not yet available
Necessary for decision:
Postpone finalization of GTR for EtOH and Aldehydes measurement till end of 2013
Way out:
Validation will be performed separately in Sept. 2013

10. Validation of measurement of EtOH and Aldehydes
Additional measurement campaign necessary
At least two weeks, ca. sept (depending on availability of instruments)
JRC will host the campaign
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