Mr. Silberholz presented open issues for the drafting on pages 61 to 75 of HDH-15-04. Those issues were discussed in detail and will be taken into account during the further drafting process. The most prominent ones are listed below:

• Handling of gearboxes and shift algorithms; the Japanese regulation allows both generic and OEM specific model for automatic transmission.
• Definition of the rated power of a hybrid system; institutes were asked to check the US EPA approach and to make a proposal.
• How to deal with vehicles which by design cannot reach the maximum WHVC speed; it was suggested to scale power down, but EPA raised some concerns; Japanese approach should be checked.
• Work (engine or system) to be used for the emissions calculation. Mr. Dekker made clear that NL have concerns about the systems approach. The chairman concluded that there seems to be some diverging views within the group and that this will be an important topic to be discussed at 16th HDH meeting.
• Equivalency between post-transmission powertrain test, HILS with verification on chassis dyno and HILS with verification on system bench (pre-transmission powertrain test).