Comparative Assessment for Holistic Evaluation of Drive Systems

The development of vehicle drive systems targets different goals, which are partly con-
tradictory. While the focus is often on increasing efficiency and—depending on the type of drive
system—performance, the aim is to simultaneously reduce costs, weight, and volume as much as
possible. This goal generally presents a conflict of objectives; for example, a gain in efficiency usually
correlates with higher costs, or an increase in performance reduces the maximum achievable efficiency.
Therefore, each drive system represents a compromise among these goals, and depending on the
main focus, the development can be influenced. The methods presented in this work serve as a
methodological framework for the evaluation of vehicle drive systems. The procedure involves
evaluating different drive concepts based on defined criteria and comparing these evaluations with
one another. These criteria can be selected freely and weighted differently, depending on the individ-
ual focus. In the sense of a holistic assessment, a system evaluation factor ultimately serves as an
indicator, which is composed of the rating values of the individual criteria, taking into account their
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specific weightings. With the help of the novel method presented in this paper, the complexity of
comparing differently designed powertrains is reduced, and a holistic assessment covering relevant
viewpoints is possible. Such an all-encompassing view is helpful in the early development phase and
is required as an evaluation basis for further, groundbreaking decisions in concept development.