Flex-eDrive: Next Generation e-Powertrain Concept for Maximum Flexibility and Cost Scaling

Christoph Danzer･Rico Resch･René Kockisch･Stephan Günther･Philipp Welke･Tobias Voigt･Volker Helbig･Volker Ambrosius･Hubertus Ulmer (IAV)

The Contribution Starts with an Outlook to Optimum Voltage Levels for the HV-System of Future Heavy-Duty CVs. This and Further Requirements of Future Drive Systems Define the Boundary Conditions for the New Flexible CV-Electric-Drive-Concept. The Basic System Can be Flexibly Integrated into the Vehicle in Longitudinal and Transversal Direction with a High Degree of Common Parts. The transversally installable system employs an adapted design of the basic system and enables an installation as an high efficienct and compact axle-drive. The system may be optimized in terms of installation space and continuous performance by using Phase Change Cooling.

Study of Optimal Thermal and Power Management Control for Hybrid Electric Vehicle Based on Vehicle System 1D Simulation Model

Yuya Hato･Wei-Hsiang Yang･Toshio Hirota･Yushi Kamiya (Waseda University)･Kiyotaka Sato (Mazda)

When using the lithium-ion battery in the electric vehicle, it is necessary to take measures against thermal runaway and degradation at high temperatures and battery voltage drop at low temperatures. In order to achieve this objective, it is important to control the temperature and power of the battery in an appropriate and efficient manner. We studied how to manage lithium-ion batterie and thermal system in hybrid electric vehicles using a vehicle system 1D simulation model and optimization method.

A Study on Calculation Method of EV Range per Charge for Heavy-Duty EV
-Considerations of Test Duration and Influence of Regenerative Braking Characteristics-

Shinji Yoshikawa･Nobunori Okui (NALTEC)

The regulation in TRIAS stipulates to test the EV range per charge of heavy-duty EVs at constant speed using actual vehicles. The EV range per charge is, however, influenced by the characteristics of regenerative braking during deceleration. Therefore, we studied on a calculation method of EV range per charge from the electric energy stored in the battery and the rate of electric energy consumption, considering the test duration and the influence of the characteristics of regenerative braking.

Evaluation Review of a Chassis Dynamometer System for xEV Testing (Second Report)
-Analysis of the Impact of 4WD Chassis Dynamometer Performance Requirements Evaluation Parameters on Electric Power Consumption-

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

In order to reproduce the actual driving conditions of an xEV on a 4WD chassis dynamometer, it is essential to appropriately reflect the unique power performance of an electric vehicle (especially the transient characteristics including sudden acceleration and deceleration) on the platform.
Following the results of the first report, this second report discusses evaluation indices that consider the impact on power consumption rates of the 4WD chassis dynamometer necessary for evaluating actual driving characteristics of xEV

Driving Efficiency and Innovation in BEVs
-Next-Generation Electronics-

Ayman Ayad･Philip Brockerhoff (Schaeffler AG)･Takuya Mimori (Schaeffler Japan)

Electrification is transforming the automotive landscape, driven by the need for efficiency, cost reduction, and sustainability. This presentation introduces advancements in power electronics and charging technologies for BEVs, focusing on wide-bandgap (WBG) materials like silicon carbide (SiC). Key topics include innovative inverter technologies such as the Smart 3-Level topology and hybrid Si-SiC modules, which optimize performance and reduce costs. Additionally, strategies for integrating 400 V charging with 800 V systems are explored, emphasizing efficiency and scalability. These innovations highlight how advanced high-voltage architectures can redefine BEV efficiency, affordability, and sustainability, paving the way for the future of e-mobility.