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Vehicle electronics systems will continue to become more complex and larger in scale. This causes their development to be conducted without control. As a result, system development involves things becoming intertwined with each other, like spaghetti. This has made it extremely difficult to develop an entire electronics system coherently and efficiently, from functional architecture down to physical architecture. There is thus a need to reform the development style of the electronics field to a style which will continuously and efficiently generate high-quality products. This will be achieved by dividing development into functions and components. Function development refer to developing functions that OEMs want to equip in the vehicles, that is, “what to make. Components development refers to “how to realize these components. For this activity, it is necessary to promote and accelerate platform-based development looking down at entire electronics systems.

With the development of car electronics, increasing numbers of ECUs are mounted in vehicles and “function integration” and “unification of mechanical and electronic” are moving forward. In order for DENSO to supply customers with the optimum of these increasingly complex products, we use simulations from upstream processes, where there is a lack of design information, and are proceeding with the construction of virtual development environments in order to create products. This paper discusses these development techniques.