Memorandum from the US Environmental Protection Agency on the proposed addition of test procedures for heavy-duty hybrid vehicles to the global technical regulation on heavy-duty vehicle emissions and fuel consumption (WHDC) identifying “a number of open issues that are causing concern for the United States and require resolution prior to considering the Annex for adoption”.

EC presentation reviewing the interest in and concern over the prospects for integrating the HDH procedures into the Euro VI legislation.

Review of the goals and status of the heavy-duty hybrid HILS test model validation program.

Presentation providing a summary of 15th HDH meeting, status of HDH validation test programs, topics for 16th HDH meeting, status of the amendment drafting group, revised project roadmap & planning, and plans for next meetings.

Presentation on the status of the work, including a new HILS-GTR v0.5 simulation model release, Validation Test Program 2 (VTP2) model verification and drive cycle development, the definition of rated power of hybrid system, and review of major open issues.

Zip compressed file for the amendment and related materials to enable the use of a Hardware-in-the-loop simulation (HILS) method for the certification of heavy-duty hybrid vehicles under Global Technical Regulation No. 4.

ACEA proposal for defining a hybrid key function (torque split for parallel hybrids and energy management for serial hybrids) in the configuration of HILS software in the testing heavy-duty hybrid vehicles. ACEA also proposes to exclude “micro” hybrid systems (i.e., 48-v based systems) used to supplement the internal combustion engine as a means to reduce CO₂ emissions and improve fuel efficiency. The exclusion criteria would be based upon the ratio of positive electrical power to total system power (to be defined).

The HILS method currently used in Japan does use a cold-start test in hybrid testing; however, GTR No. 4 will use a cold-start test. This presentation discusses Japan’s proposal for a “predicted temperature method” that inputs the temperature profile of each component in advance.

Discussion presentation from Japan towards harmonizing the provisions for testing hybrid vehicles in the kokujikan and the proposed GTR to avoid divergent interpretations.

Review of Korean results using the heavy-duty hybrid vehicle mode on a chassis dynamometer per the proposed amendment to enable hybrid vehicle testing under GTR No.4

Status report on research and validation programs concerning:

• HILS Model Library
• WHVC Test Cycle
• System Work Concept
• Rated Power Determination for a Hybrid Vehicle
• Family Concept-Validity of Certification
• Validation Test Phase 2 (VTP2) Validation Results−Sub-presentations of VOLVO, MAN and IVECO
• VTP2 conclusions & discussion of further actions

Decision tree for determining the powertrain family of a given vehicle under the proposed heavy-duty hybrids emissions and fuel consumption test procedures.

Overview of the status of work on the heavy-duty hybrids amendments to GTR No. 4 for the 18th HDH informal group session.

Memorandum from the US EPA providing an overview of obstacles to US adoption of the proposed heavy-duty hybrids amendment and possible remedies to overcome these concerns. This memo addresses remaining concerns beyond those presented earlier in document HDH-16-03.