Model Standardization for MBD Throughout Entire Power Unit Development Process

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 refine 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 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 MBD to the entire power unit development process, from performance design phase to performance verification phase, is challenging. This is because 1D models constructed during the performance design phase with MBD are not intended for use in the performance verification phase. Uses of 1D models in the performance verification phase include system and subsystem co-simulation for virtual calibration, Hardware-in-the-Loop Simulation verification using real-time calculation speed of 1D models and use in performance verification facilities such as test dyno. This paper explains efforts to standardize models assuming the use of MBD throughout the entire power unit development process and practical efforts of both of the phase using the standardized models. Model standardization was achieved by constructing 1D system model consisting of a plant model based on the physical architecture standard referred ISO11010-part1, a controller model corresponding to functions of the plant model, and a driver model for various driving scenarios. The application of the standardized 1D system model to the performance verification phase expanded the scope of MBD application, contributing to high-quality performance and efficient development of power units.