Abstract
This paper introduces control systems design based on functional analysis using SysML in terms of the model based systems engineering. Optimization problem for a system of interest can be redefined including its time span and physical behavior. Functions of occupant protective control are analyzed using SysML diagrams and possible necessity to take the behavior before the knee contact with the instrument panel into consideration occurs. Thus collaboration control of a lap belt and a knee bolster is derived to reduce injuries of occupants. The optimization results show that the superior performance of reduction of the lower extremities is obtained. Also importance of dynamical model reduction is emphasized in order to not only design the control system but also understand the behavior of the system of interest.
