The distribution of mobility equipped with electrified power units is advancing towards carbon-neutral society. The electrified power units require an integration of numerous hardware components and large-scale software to optimize high-performance system. Additionally, a value-enhancement cycle of mobility needs to be accelerated more than ever. The challenge is to achieve high-quality performance and high-efficient development using Model-Based Development (MBD).
The development process based on V-model has been applied to electrified power units in passenger vehicle. Traditionally, MBD has been primarily utilized in the left bank (performance design phase) of the V-model for power unit development. MBD in performance design phase has been widely implemented in research and development because it refines prototype performance and reduces the number of prototypes.
However, applying the MBD to an entire power unit development process from performance design phase to performance verification phase is not achieved. This is because 1D models constructed during the performance design phase with the MBD are not intended for use in the performance verification phase. As a result, the MBD effect is insufficient for the high-efficient development.
Therefore, uses of 1D models that made at the performance design phase for the left bank should be enhanced. In particular, the 1D system model that integrated sub-systems is important for applying the MBD to the verification phase. The 1D system model is able to use for a virtual calibration of control of a vehicle system. In addition, the verification with Hardware-in-the-Loop Simulation (HILS), Engine-in-the-Loop (EIL), and Power unit-in-the-Loop (PIL) is also achieved smoothly by using the sub-system models in the 1D system model. The 1D system model standardization is necessary for achieving the above high-efficient development process.
This paper explains efforts to the standardize model assuming the use of MBD throughout the entire power unit development process and practical efforts of both performance design phase and the verification phase using the standardized model.