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Overview of Worldwide Harmonized Motorcycle Emission Test Cycle (WMTC) Developments

This document provides a comprehensive summary of the 61st GRPE meeting held from January 11-14, 2011, focusing on the Worldwide Harmonized Motorcycle Emission Test Cycle (WMTC). It highlights key discussions, agreements on performance requirements, and the development of draft documents by the WMTC informal group. The report includes results from the September 2010 meeting, amendments regarding performance requirements and gearshift modifications, and future considerations for durability and evaporative emissions. It serves as an important resource for stakeholders involved in motorcycle emissions regulations.

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Overview of Worldwide Harmonized Motorcycle Emission Test Cycle (WMTC) Developments

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  1. Informal document No. GRPE-61-23 (61st GRPE, 11-14 January 2011, agenda item 4) Worldwide harmonized Motorcycle emission Test Cycle(WMTC) Status report WMTC Inf Gr meeting on 13/14 Sept 2010 Technical Report (ECE/TRANS/WP.29/2009/133) Corrigenda related to gearshift (ECE/TRANS/WP.29/GRPE/2011/7) Amendment related to performance requirements (ECE/TRANS/WP.29/GRPE/2011/4)

  2. WMTC Inf Gr meeting on 13/14 Sept 2010 • Hosted by EC in Brussels • Key WMTC Inf Gr members discussed and agreed outline for most appropriate combination of principal and alternative performance requirements with corresponding reference fuel specification • Continued bilateral discussions on gearshift prescriptions • Drafting group prepared 2 draft official documents for review and comment by WMTC Inf Gr prior to submission to GRPE • Identification of durability, evaporative emission, … as items for future consideration (phase 3) Note: Final meeting report circulated to WMTC Inf Gr members

  3. Technical Report (ECE/TRANS/WP.29/2009/133) • Considered by WMTC Inf Gr as still sufficient and appropriate to accompany the proposed sets of performance requirements http://www.unece.org/trans/doc/2009/wp29/ECE-TRANS-WP29-2009-133e.pdf

  4. Corrigenda related to gearshift (ECE/TRANS/WP.29/GRPE/2011/7) • Corrections related to • Upshift speed equation/formula • Rounding of shift speed calculation results • Clarifications of gearshift modification rules (with examples) http://www.unece.org/trans/doc/2011/wp29grpe/ECE-TRANS-WP29-GRPE-2011-07e.pdf

  5. Amendment on performance requirements (ECE/TRANS/WP.29/GRPE/2011/4) • Performance requirements • Japanese limits as principal limits • 3 sets of alternatives limits (Euro 3; Indian and US) • Reference fuel • Existing WMTC reference fuel as default for principal limits with option to use Japanese reference fuel (or other reference fuel with demonstrated equivalence in terms of emissions) • Existing WMTC reference fuel also linked to Indian and Euro 3 alternative limits • US reference fuel linked to US alternative limits http://www.unece.org/trans/doc/2011/wp29grpe/ECE-TRANS-WP29-GRPE-2011-04e.pdf

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