Presentation from the WLTP informal group drafting coordinator on the status of the draft Phase 1b amendment to GTR No. 15 on light vehicle emissions.

Status report to the WLTP informal group as part of the ongoing validation of the Phase 1a test procedures.

Criteria for dual-axis chassis dynamometers have been added to the GTR in paragraph 2.3 in Annex 5, with the intention to make the use of a dual-axis chassis dynamometer mandatory for vehicles tested in 4WD mode. Though these criteria were put in place, there was no specific requirement added to include the requirement that vehicles tested in 4WD mode are actually tested on a dual-axis chassis dynamometer. This proposal would add a paragraph to address this omission.

Review of European testing to validate the Phase 1a test procedures of the light vehicle emissions GTR No. 15.

Summary of feedback received from labs conducting tests according to the phase 1a version of the light vehicle emissions GTR No. 15.

Comments from India concerning the Phase 1b amendment to GTR No. 15 (document GRPE/2016/3).

Update on EU experiences with the initial GTR No. 15 test procedures.

Report on the efforts to resolve outstanding issues concerning the gearshifting requirements under the WLTP test cycle, including items raised during validation phases of the initial GTR procedures.

Report of the task for established to resolve issues regarding the testing of 2WD and 4WD vehicles on single and dual axis dynamometers (in support of EU plans for new regulatory requirements in 2016) following its first session.

Status report regarding open issues carried over from the just completed phase 1b of the development of GTR No. 15.

Table based upon document GRPE-72-10/Rev.2 reviewing errors and inconsistencies remaining in the GTR text.

Clarification of n/v ratios (engine rotational speed divided by vehicle speed) and vehicle mass definitions.

Starting note for the OBD Task Force established for the development of OBD requirement compatible with the WLTP test cycles (and potentially as a separate GTR from GTR No. 15) during the Phase 2 work on GTR No. 15.

Draft proposal for a mandate to develop two different types of tests:

a) In-service-conformity (ISC) testing to be done by the manufacturer and the authority responsible for issuing the emission type approval and intended to assess the durability of emission control systems over a certain period of use.

b) Verification testing typically to be done by an independent third party, i.e. an authority not involved in the initial type approval process, NGOs or the manufacturers’ peers, in order to check the integrity of the initial approval test itself and to ensure that the use of (partially inevitable) test flexibilities by the manufacturer is limited.

1) Bag measurements vs continuous diluted sampling and 2) Calibration gases and mixtures

Starting note for correction factors for the dynamometer roller radius, additional cooling fan, and alternative road load determination process.

Proposal to clarify procedures (calculation of dynamometer setting coefficient) and number of coast-down runs required.

Draft proposal for consideration of testing where the test track is too short to coast down from ~145 km/h to ~15 km/h within a single straight track, thus necessitating split runs.