Evaluation Review of a Chassis Dynamometer System for xEV Testing
-(4th Report) Overview of JASO E018 Part-3 for the Purpose of Reproducing Actual Driving Conditions-

Noriaki Nakate (JATA)･Hisakazu Suzuki (NALTEC)･Isamu Inoue (Ono Sokki)･Yoku Hirose (HORIBA)･Tomonobu Furuta (MEIDENSHA)･Hideyuki Kuba (Mazda)･Kenji Sato (Toyota Motor)･Yasuhito Takemura (Daihatsu Motor)･Kosuke Tashiro (Mitsubishi Motors)･Masato Taniwaki (Suzuki Motor)･Shohei Nakagawa (Honda Motor)･Masaki Naruke (JARI)･Takeo Horikawa (SUBARU)･Keiichi Masutani (Nissan Motor)･Akira Noda (Former JATA)

The JASO E018 standard specifies control requirements and performance evaluation methods for chassis dynamometers to enable on-bench reproduction of real-world fuel consumption, energy consumption, and exhaust emissions evaluations, as well as diverse driving conditions. Considering the power characteristics of xEVs (electrified vehicles), this standard newly specifies evaluation methods and metrics enabling high-precision evaluations for these vehicles. This report outlines the standard and details the key points determining its various requirements.

From REEV to Hyper-REEV
-Enhancing the Driving Pleasure of Electrified Sports Cars-

Christoph Koehler･Takuya Maeda (IAV Japan)･Marc Sens･Alexander Fandakov･Michael Riess (IAV)

Battery-powered electric drives are shaping the future of passenger cars, but electrified sports cars face reservations due to a lack of emotion. This article presents a powertrain concept for super sports cars that combines electric drive with combustion engine emotions using a range extender. The Hyper-REEV mode synchronizes engine acoustics with acceleration, offering high emotion and high efficiency. The article analyzes requirements and solutions for Hyper-REEV components, including battery design, e-machines, power electronics, and generator. The combustion engine's role is decisive, showcasing high efficiency and dynamic performance. The final part covers the overall concept and control strategy linked to SDV.

Accelerated Reliability Assessment for Power Electronics: Optimizing Traditional Testing Methods for EV Applications

Gerard Ibars Escarre･Yasmine Himene･Javier A. Corea-Araujo･Agustin Bucciarelli (Applus+ IDIADA)･Abdelali El Aroudi (Universitat Rovira i Virgili)

This paper investigates how optimized accelerated testing methodologies can reduce validation timeframes for power electronics in electric vehicle development. Current OEM approaches utilizing Power-Thermal-Cycle-Endurance and High-Temperature-Operation-Endurance protocols require >6-month validation cycles, conflicting with 2-year EV production timelines. Laboratory data reveals limitations applying conventional power cycling to GaN-based OBCs and SiC DC-DC converters, where standard Coffin-Manson models show reduced applicability. Analysis of physics-of-failure approaches and mission profile-oriented strategies demonstrates potential timeframe reductions. Results indicate properly configured accelerated aging tests incorporating junction temperature swing control and realistic switching conditions maintain reliability assessment accuracy while significantly accelerating validation processes for modern automotive power electronics.

A Study on Electrical Efficiency Improvement and Heating Control via Induced Inefficiencies of an Electric Compressor for EV Energy Consumption Improvement

Woo Jun Hur (Hyundai Motor)

This study proposes an integrated strategy to improve the electrical efficiency of electric compressors in electric vehicles (EVs), focusing on improvements in both motor design and inverter control. Key optimizations were applied to stator and rotor parameters, along with advanced inverter control techniques such as MTPA, DPWM, and SiC MOSFET integration. Additionally, a novel loss-based heating control method was explored to support heat pump operation under cold ambient conditions. Experimental validation confirms the effectiveness of the proposed approach, demonstrating its potential for improving EV energy consumption and system-level thermal management.

Contributing to an Energy and Resource Saving Society through Dynamic Wireless Power Transfer for xEV

Yuki Konno･Naoya Kato･Tetsuji Mitsuda･Keisuke Tani･Hayato Sumiya･Hiroko Yahata･Kouji Yamaguchi (DENSO)

In order to contribute to carbon neutrality, we aim to reduce the battery capacity to 1/3 or less as a means of reducing carbon emissions when manufacturing battery of electric vehicles. At the FY25 JSAE, we announced the specifications of the on-road power supply for a heavy-duty vehicle with 1/3 battery. In this case, we clarified the conditions under which long-distance continuous driving is possible by moving the subject to urban areas.