Proposal on Method of EV Integrated Thermal Management System Comparison and Development Trend

Hosik Lee･Sukjoo Kim･Chiheon Song･Byungsoon Min (TENERGY)

The technology that has the greatest impact on the low-temperature driving range of electric vehicles is the thermal management system. In order to improve the efficiency of thermal management system, the system configuration is becoming more complex, with system such as heat pump system and waste heat recovery system. In this study, we propose a method for comparative analysis of the thermal management systems by vehicle, and summarize the results of the analysis using the Hyundai Ioniq5 and Tesla Model Y as examples.

Reducing Energy Losses in xEV Motors and Batteries through CO₂ Refrigerant Utilization for Lubrication and Thermal Management

Shoko Horibata･Yuma Miyauchi (Mazda)

Generally, motors, batteries, and air conditioning systems for xEVs are thermally managed through separate pathways for oil, water, and refrigerant. We are working on centralizing of these systems using CO2 refrigerant with electric insulation and low viscosity, enabling both direct cooling and lubrication simultaneously. As a result, we confirmed improvements in thermal management performance, reduction in both the friction losses of the shaft and the agitation resistance of the rotor.

Novel eAxle with Integrated Charging System for Electric Vehicle

Yoshihisa Kubota･Soumei Nakatomi･Takumi Todoroki･Naoya Naito･Keisuke Azusawa･Satoyoshi Oya (Honda R&D)

With the advancement of electric vehicle performance, the increase in electrical components needed to connect various power devices has led to problems associated with increased part count, weight, and cost. In this study, we developed a novel power unit that integrates AC charging and rapid DC charging functions by converting a three-phase motor to a two-phase motor using a drive inverter and motor. This paper reports on the operating systems of the drive and charging functions.

Pareto Solution Search of Unsprung Mechanical Transfer Characteristics and Control System for In-Wheel Motor Vehicle

Norihiro Sugimoto (The University of Tokyo / DENSO)･Sakahisa Nagai･Osamu Shimizu･Hiroshi Fujimoto (The University of Tokyo)･Yusaku Ishiguro･Isao Kuwayama (Bridgestone)

In-wheel motor vehicle can control the sprung vibration by utilizing the suspension reaction force by the driving force. However, the optimization considering the mechanism parameters such as the sprung weight and the tire spring constant as variables has not been carried out. In this study, performance optimization such as riding comfort by simultaneous design of mechanism and control using 1D-model was proposed.