International Organization of Motor Vehicle Manufacturers
18 Dec 2009 Proposal for an emissions test procedure for heavy-duty hybrid electric vehicles (OICA) GRPE-59-02 2009-12-18 OICA proposes the development of a global technical regulation for certification of HEV. The proposal aims to provide a test procedure and harmonized technical requirements for HEV emissions certification. The proposal is focused on emissions certification rather than on fuel consumption or CO2 certification. OICA further proposes that the regulation should be based on the HILS approach, which starts from a vehicle cycle and simulates powertrain and vehicle components to come up with an engine cycle for emissions testing and measurement. OICA
20 Dec 2010 Proposal for corrigenda to GTR No. 4 (WHDC) (OICA) GRPE-61-04 2010-12-20 OICA
18 Jan 2012 Proposal for corrigendum to global technical regulation No. 4 (OICA) GRPE-63-15 2012-01-18 This proposal would correct editorial errors detected in GTR 4 during the transposition of the GTR provisions into UN Regulation 49 (6 series of amendments). OICA
15 Jan 2015 Proposal for amendments to the draft Amendment 3 to GTR No. 4 (OICA) GRPE-70-18 2015-01-15 Proposal to align the draft Amendment with the harmonized terminology and definitions developed by the informal group on Vehicle Propulsion System Definitions. OICA
11 Jan 2018 HD Fuel Economy - Proposal for global harmonization (OICA) GRPE-76-20 2018-01-11 OICA proposal to pursue gradual harmonization of heavy-duty vehicle fuel efficiency standards, beginning with an effort to define a uniform measurement procedure through a global technical regulation. OICA
12 Jun 2018 Heavy-duty vehicle fuel efficiency harmonization (OICA) GRPE-77-08 2018-06-12 OICA
15 Jan 2020 Discrepancies between GTR 4 and UN R49 (OICA) GRPE-80-17 2020-01-15 OICA
15 Jan 2020 UN GTR 4 Proposal for corrigendum (OICA) GRPE-80-25 2020-01-15 GRPE to consider the proposal from the expert from OICA for corrigendum to GTR4 OICA
11 Jun 2025 GTR 4: Input on amendments to enable application to ADS vehicles (OICA) GRPE-TF-AVRS-25-15 2025-06-11 OICA
28 Mar 2011 Proposal for Corrigendum 1 to Amendment 1 to global technical regulation No. 4 (OICA) GRPE/2011/9 2011-03-28 OICA
1 May 2012 Proposal for Corrigendum 1 to Amendment 1 to GTR No. 4 (OICA) GRPE/2012/10/Rev.1 2012-05-01 Corrections to paragraph cross-references within GTR No.4 which were identified during transposition of the GTR into UN Regulation 49. OICA
18 May 2010 Hybrid vehicles: Hardware in the loop simulation (OICA) HDH-01-04 2010-05-18 OICA
13 Jan 2013 Heavy-duty Hyrbrids: OICA presentation proposing use of SILS in validations (OICA) HDH-12-04 2013-01-13 OICA
19 Mar 2013 OICA input on the HILS validation program (OICA) HDH-13-05 2013-03-19 OICA
17 Oct 2013 Proposal for Plug-in Hybrid Certification (OICA) HDH-15-03 2013-10-17 Presentation concerning heavy-duty hybrids. OICA
19 Oct 2013 Consideration of Vehicle Parameters for HILS Simulation (OICA) HDH-15-06 2013-10-19 Discussion of vehicle characteristics to be taken into account (or left out) in order to ensure an optimally harmonized set of heavy-duty vehicle test procedures for worldwide use. OICA