4.1 Presentation by research institutes on validation test program 1

Working paper HDH-14-03e is a joint presentation of the three institutes tasked with conducting validation test program 1.

Prof Fredriksson started with an overview of the new model structure (pages 4 to 12). Rationale for the new model structure was a greater flexibility of the modeling approach that allows various combinations of engines, gear boxes and energy storage systems. The new model structure for serial and parallel hybrids was made available for testing at the end of April. It includes a comprehensive component model library, a new signal naming convention based on AUTOSAR and the restructuring of the vehicle models. Relevant powerpack components were included in the library toolbox, while previously developed models were transferred into the model library. The models will be further developed until the end of June 2013 based on feedback from OICA members and other stakeholders.

Mr. Silberholz reported on positive feedback from OEMs on the new model structure. Open issues from the discussions are the actuation of different brake systems in the driver model and time vs. distance based slope pattern. He continued with a detailed analysis of the road slope calculation methods (30 sec moving average method vs. minicycle approach, pages 15-19). The two options are considered not directly comparable due to big deviations in resulting reference power pattern. Reason is that the WHTC denormalization method leads to operation points at lower loads and speeds for hybrid powertrains. Therefore, the WHDHC calculation tool may be not suitable any longer. Further investigations on this item will continue.

As a conclusion of validation test program 1, extensive changes on models and model structure were made, the next model release (including stakeholder remarks) will be available shortly, the comprehensive model and work program documentation will start, and drive cycle modifications need further investigation.