Mr. Planer presented the work program of the Institute for Powertrains & Automotive Engineering (IFA) at the TU Vienna. He started with a general overview of the Japanese HILS method. He concluded that the Japanese process, which verifies simulated results with real data, is a promising concept. In some cases, the model verification might not be accurate enough with cycles other than the JE05 cycle. If model verification fails, component models would have to be improved as often as needed in order to pass the verification test, which could require high efforts. If components are very complex (such as combustion engine), input data for the simulation model might increase, significantly. An extended HILS concept, as shown on page 15 (“engine-in-the-loop”) is suggested for further consideration by the Informal Group.

For the component testing, common methods are used to obtain the component parameters relevant for the simulation models. In the current engine model, influence of temperature is neglected, since engine testing is done under hot condition in Japan. For the gtr n°4, which contains cold and hot start testing, temperature influence need to be taken into consideration. Finally, component testing strongly depends on the requirements of the model. Therefore, the modelling depth is dependent of the desired accuracy.

In summary, the Japanese model is judged to be a good basis, but need to be refined for a global regulation. The suggestions for a global regulation are shown on page 17 [of document HDH-08-03].

The proposed next steps are shown on page 19 [of document HDH-08-03]. As a first step, a real real heavy duty hybrid vehicle should be simulated with the Japanese open source model. This software simulation should use a relatively simple hybrid model, e.g. a serial hybrid. As a second step, a sensitivity analysis should elaborate the influence of individual models and the model depth for each component on the overall quality of the result. Finally, it is necessary to find the break even point between minimal simulation effort and maximum model quality.

Mr. Planer also recommended to consider possible alternatives, such as the extended HILS method and powerpack testing.

The real heavy duty hybrid simulation is not part of the current TU Vienna work package. The secretary asked Mr. Planer to prepare a quote for this program. The program would become the first validation study and would start in June 2012.