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

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

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

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

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)

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

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

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

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

Validation of measurement of EtOH and Aldehydes Additional measurement campaign necessary At least two weeks, ca. sept. 2013 (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