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In order to make the wireless power transfer system, the fabrication process of coils and the design of electric insulation and high thermal conductive materials are proposed by taking high current inductor system as an analogy. The fabrication process of the coil is developed for high current inductors. The copper plate is pressed and folded double at two fulcrum points to produce coils. The developed process restrains the cracks in the coil, compared with the conventional process involving the bend of rectangular wire in the lateral direction. The electric insulation coatings on the coil are developed. The electrical breakdown strength of the developed coatings is slightly higher than that containing polyamideimides. The developed material has a higher thermal conductivity of 0.83 W/m K. The high thermal conductive potting materials are developed to use between the coil unit and the aluminum case.

Concept of the spray guided direct Injection spark ignition (DISI) was studied to improve the performance of wall-guided DISI. Focusing the effect of multi-hole injector location either centrally-mounted or side-mounted, mixture distribution and ignitability was studied. Computational Fluid Dynamics (CFD) modeling was applied to investigate the history of mixture, ignitable mixture existence around the spark plug in light load condition and homogeneity in full load condition. CFD results showed that side-mounted injection has an advantage over centrally-mounted injection in terms of mixture stability around the spark plug, although the slight disadvantage in homogeneity in full load condition. Side-mounted injection was selected because of robust ignitability potential and further experimental investigation was conducted. Stable combustion window against injection and ignition timing was investigated in experimentally.

The aerodynamic characteristics of the vehicle underbody are one of the critical components to achieve efficient fuel-economical vehicles. On the other hand, computer memory and time make it difficult to make the complex geometry of the underbody of an actual vehicle including the engine room. In this paper, we have investigated a new CFD analysis method using the automatic tetrahedral/prismatic cell generation tools for the analysis of an underbody flow. The CFD analysis results are compared with experimental data. This new method also contributes to reducing the development term of the aerodynamics characteristics with underbody.