Abstract
In the development of complex systems such as automated driving systems (ADS), Model-Based systems engineering approaches through the use of a system model are useful to manage system complexity. At the current practice of system developments, there is a high possibility that the system requirements, behavior, and even more system constraints will not be reflected if analytical models are built without system models. Therefore, it is difficult to maintain traceability with requirements as development progresses. In this paper, building analytical models for ADS based on the system models are presented. First, system models of ADS are built. In particular, the behavior of ADS is described in terms of functional flow and state using the function based on the safety requirement relating to driving authority delegation of ADS. Then, system parameters and constraints are identified from the behavior of ADS when constructing analytical models relating to driving authority delegation of ADS, and reflect them in the system models. Finally, analytical models are built based on the system model describing the constraints, and system level analysis are performed on driving authority delegation of ADS using analysis models. Analytical models based on the system models allow system engineers to essentially analyze behaviors and constraints reflecting requirements on the system.
