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Amendments to GTR 19 were made to address the transposition of WLTP GTRs to UNR. Key modifications include updating the scope to include engines fueled with petrol, addressing depressurization puff loss overflow SHED measurement concerns, and adding procedures for Conformity of Production. The amendments also included options for mono-fuel gas vehicles and revised testing methods. These changes aim to align with UNR WLTP requirements for vehicle emissions testing.
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WLTP-29-05e_Appendix05 Summary of GTR19 Amendment 3 13thJan., 2020
Background of GTR 19 Amendment 3 1/4 During the discussion of transposition on WLTP GTRs to UNR, followings 3 needs were identified: 1. Need to modify the scope 2. Need to modify depressurization puff loss overflow SHED measurement 3. Need to add procedures and requirements on Conformity of Production (CoP) as Optional Annex. EVAP TF was re-opened on 15thOct. 2019 once, to discuss mainly on the procedure on Conformity of Production
1. Modification of Scope 2/4 Original text from GTR19 Amend2 Modified text from GTR19 Amend3 ID Modification from "positive ignition engines" to "engines fuelled with petrol“ • Concern: “compressive ignition engines” uses gasoline are out of scope with this text. (e.g. HCCI engines) • Solution: Considering the meaning of evaporative emission test, it was agreed to modify the text. Addition of Contracting Party option for "mono-fuel gas vehicles“ • Concern: No evaporative emission test will be done for mono-fuel gas vehicles even the gasoline tank is installed. • Request: Japan requested to include those vehicles also into the scope. • Solution: Contracting Party option were added to keep exclusion of mono-fuel gas vehicles from the scope as an option for some countries. Agreed within EVAP TF
2. Modification of depressurisation puff loss overflow SHED measurement 3/4 ■Depressurisation puff loss overflow The puff loss escape from canister when the pressure inside the sealed fuel tank system is released before refuelling. ■ Current measuring methods After 11-hour diurnal (20°C 35°C) 1. Use additional carbon canister 2. Use SHED Measure HC, 1 min after pressure release ■ Concern raised (SHED measurement) 1 min is not enough to mix the air inside SHED, if the canister is berried very inside the vehicle. *1 min comes from US EPA ORVR method. Measurement of puff loss from fuel inlet ■ Solution Modify 1 min to 5 min. (No data to show 5 min is enough but it is identified that 1 min is not enough. If there will be a data obtained in the future that 5 min is not enough, another discussion can be done.) Agreed within EVAP TF among e-mail exchange
3. EVAP CoP test procedure (Optional Annex) NOTE! This CoP test procedure is added to GTR 19 as OPTIONAL ANNEX (CoP test are not done by the manufacturer in some countries.) ■ Point of CoP test: Not like the certification test, the conformity of production tests are done using the vehicles to be sold after the test. ■ Frequency of test Once per year from the EVAP CoP family ■ Test method • Simplified methods (leak test, vent test, and purge test) applied in UNR 83 with slight updates for new technologies like sealed fuel tan systems • If failed, GTR19 full test shall be done But use of a vehicle completed a minimum mileage of 20,000 to 30,000 km is allowed. Agreed with EVAP TF and aligned with UNR WLTP
