Mr. Berg presented working paper HDH-09-08. He indicated that the extended HILS approach proposed by TU Vienna as a possible alternative would require new test equipment connected to the engine dyno. Overall, benefits would be low, and higher accuracy would better be achieved by powerpack testing.

As regards the WHDHC proposed by TU Graz, WHTC has artifacts, like gear shift torque interrupts that may not be present in a hybrid vehicle with a non-conventional gearbox. In addition, the WHTC is based on assumptions that may not be valid for e.g. a serial hybrid. But also the WHVC would create some problems, since it defines no slopes thus being less
representative for highway applications. Artifacts from conventional gearbox shifting are visible in the vehicle speed profile and would require a smoothing of the speed trace. OICA is in favor of investigating both the WHVC based approach (option 1) and the WHTC based approach (option 2).