Lifecycle greenhouse gas emission assessment of EVs using lithium-ion capacitors for wireless charging while driving

Asahi Nakayama･Ryosuke Ota (Tokyo Metropolitan University)

Dynamic wireless power transfer charges the vehicle battery only over limited road sections, resulting in a heavy load on the onboard battery. Therefore, this study investigates a system that combines the battery with a lithium-ion capacitor, which is suitable for high-power input and output, to extend battery lifetime. The effect of this lifetime extension is converted into greenhouse gas emissions over the entire life cycle, and the resulting reduction effect is quantitatively evaluated.

Development of Integrated Technologies for Dynamic Wireless Power Transfer and Autonomous Drive

Osamu Shimizu･Kazuyoshi Hanabusa･Kan Yamazaki (The University of Tokyo)･Zhihong Wang･Yoshinori Hirooka･Shigeo Kishi (PUES)

With the growing popularity of electric vehicles (EVs), wireless power transfer during driving (DWPT) has garnered significant attention in recent years. Applying DWPT to autonomous vehicles realize vehicles capable of driving indefinitely without a driver. A key challenge in utilizing this technology is that lateral misalignment of the coils cannot be resolved even when using sensor fusion technologies—such as cameras, LiDAR, and GPS. Therefore, we propose a method that estimates lateral misalignment based on the DC current at the receiver and vehicle dynamics model, and performs steering correction on the autonomous driving system side.

Energy Management System Utilizing EVs and Shared Energy Storage System

Yuito Ohno (Nagoya University)･Shinkichi Inagaki (Nanzan University)･Tatsuya Suzuki (Nagoya University)

This study investigates an energy management system that coordinates electric vehicles (EVs) and a shared battery within a local community for the effective utilization of surplus photovoltaic generation. We construct an operation method for the system and evaluate it from various perspectives, thereby discussing its effectiveness and remaining challenges toward practical implementation.

Investigation of EMC Testing During Charging and Discharging for On-board Bidirectional Chargers

Akira Mori (Toyota Motor)

The adoption of electric vehicles equipped with bidirectional chargers is advancing to make more effective use of electrical energy. Bidirectional chargers have both charging and discharging modes, but performing the EMC tests required by UN R10 for both modes presents a challenge due to increased testing effort. Therefore, we examined whether comparing EMC test results between the two modes could demonstrate equivalence, allowing testing to be limited to the charging mode alone.

Feasibility of Mobile Containerized DC Microgrids

Takeshi Serizawa (Daihatsu Motor)･Nobuhiro Kobayashi (Maeda)･Shiyouji Takeda (Daihatsu Motor)

We developed a 50 kW-class DC microgrid by applying automotive inverter technology. The system integrates a compact PCS, a 172 kWh battery, and V2X within a 20-foot container, enabling mobility. Combined with BEVs, it realizes a transportable distributed energy infrastructure. Demonstrations are being conducted through collaboration between a construction company and an automotive manufacturer to validate power optimization and business continuity (BCP) benefits, and the effectiveness of this approach is discussed.

Development of an On-board Built-in V2X System Utilizing the MG Neutral Point

Takeshi Serizawa (Daihatsu Motor)･Kazuyuki Yoda･Satoru Fujita (Fuji Electric)･Shiyouji Takeda (Daihatsu Motor)

An on-board built-in V2X system can be realized by combining the neutral point of the motor generator (MG) with the main inverter. This study verifies its effectiveness using a proof-of-concept prototype equivalent to the actual system. Conventional BEV-based power infrastructure requires expensive dedicated V2X equipment. In contrast, the proposed approach enables V2X functionality with minor modifications to existing systems, significantly reducing cost and complexity. Experimental results confirm stable operation and feasibility. The proposed method eliminates additional power conversion hardware and is expected to accelerate the practical use of BEVs as distributed power infrastructure.