Brief review of open issues concerning electric vehicle testing for resolution during “Phase 1b” of the development of the light-duty vehicle emissions GTR (WLTP).

Review of main test procedures and flowchart towards determining pass/fails.

Review of the European validation program to assess the repeatability of the test procedure described in the Phase 1a GTR text.

Plan for the Asian validation program to assess the repeatability of the WLTP test procedure as part of its phase 1b development.

Heinz Stephen presentation on the technical report on the development of the harmonized driving cycle used in the global technical regulation on light-duty vehicle emissions (WLTP).

Heinz Stephen presentation on the technical report on the development of the test procedures used in the global technical regulation on light-duty vehicle emissions (WLTP).

Heinz Stephen proposals for addressing selected technical issues remaining to be resolved through the supplemental phase (“phase 1B”) for the refinement of the global technical regulation on light-duty vehicle emissions.

Progress report on test validation and refinement efforts from the Technical University of Graz (concerning the chassis dynamometer test) and TNO (concerning the road load/coast down test)

Proposal of a test to reflect the CO2 values obtained under “real life temperature conditions”.

Progress report of the WLTP “Additional Pollutants” expert subgroup.

Table of items for resolution in phase 1b in the development of the light vehicle emissions and fuel consumption global technical regulation.

Letter raising concerns regarding misinterpretation of the definition of a hybrid electric vehicle and resultant misapplication of approval requirements.

Proposal to refine the selection of reference speeds for the road load curve determination (Open Issues List Item 12: Coast down procedure (Annex 4)).

Presentation on the use of “sailing” technologies to reduce CO₂ emissions and raising a question over the ability of the WLTP test cycle to account for the effect of sailing on vehicle emissions and fuel consumption performance. Sailing involves the decoupling of the engine from the drive shaft, enabling hybrid vehicles to cruise (or “sail”) on battery power alone until such time as the engine needs to be restarted to generate electricity and/or resume the torque functions.

ACEA proposes to align the GTR text with the HEV definition used in the EC directive 692/2008/EC (Type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6)).

Discussion of utility factors used in weighting emissions and fuel consumption. Utility factors are ratios based upon driver statistics and vehicle ranges recorded by off-vehicle charging (OVC) hybrid electric vehicles (HEV) (i.e., plug-in hybrid electric vehicles) in charge-depleting and charge-sustaining modes.

Proposal to maintain regulatory language to ensure that vehicles cannot be mis-fueled with a fuel (diesel, leaded or unleaded gasoline, etc.) other than that for which the vehicle is designed.

Heinz Stephen update on efforts to research and resolve open issues.

Proposal on a family definition for road load determination.

Definition of wind tunnel for road load determination (Open Issues #10 and #18).

Supplemental Test for determination of CO2 emissions under representative regional conditions

Study on applicability of driving index (defined in SAE J2951) to WLTP test cycle.

WLTP Phase 1b: Generic formula for hydrocarbon density

WLTP drafting committee working document with corrections to the text of GTR No. 15.

Discussion paper on “open issue 13” (and 11) concerning corrections for wind conditions that impact coast down tests and times for road load determination and ultimately the road load settings of the chassis dynamometer. This document summarizes the views of the special ad hoc group formed to consider this issue.

Discussion paper on the use of the torque meter in the WLTP coast-down methods to measure the running resistance as part of the road load determination. This document summarizes the views of the special ad hoc group formed to consider this issue.

Initial material for deliberations on road load curve determination.

Real-time tailpipe ammonia measurements from vehicles tested over the new Worldwide harmonized Light-duty vehicle Test Cycle (WLTC)

Status report on the evaluation of road load determination (RLD) using a “wind tunnel plus chassis dynamometer” versus “coast-down” methodologies to enable a wind tunnel plus coast-down method in GTR 15 and on comparison of running resistance measured on a chassis dynamometer by ISO 10521-1 methods (stabilized speeds) and by deceleration (short method).

Progress reports from TUG (chassis dynamometer corrections) and TNO (coast down corrections) covering preliminary results (as of 27.03.2014).