Evaluation review of a chassis dynamometer system for xEV testing (Fourth 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)･Tomonobu Furuta (Meidensha)･Yoku Hirose (HORIBA)

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 Super Cars

Sens Marc (IAV)･Christoph Koehler (IAV)･Michael Riess･Alexander Fandakov (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.

Fundamental Performance Evaluation of a Vehicle Simulation Test System with Multi-type Test Bench Integration

Yoji Komatsu (HORIBA, Ltd)

With the progress of vehicle electrification, the importance of vehicle-level evaluation at the subsystem stage is increasing. In this study, we conducted a fundamental performance evaluation of Test in the Loop System (TILS), a vehicle simulation test system that integrates multi-type test benches such as battery and powertrain. The evaluation focused on comparing the response characteristics between the communication-based integration method and the bus connection method that simulates the actual environment.

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

Gerard Ibars Escarre･Yasmine Himene･Javier A. Corea-Araujo (IDIADA Automotive Technology S.A.)

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

Woojun 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.