Study on Real Road Eco-driving Methods for BEV
-Effect of One-pedal Driving on Electric Energy Consumption-

Akira Kato･Kai Kato･Sena Fujisaka･Yihong Zhong (Teikyo University)

One-pedal driving allows you to control starting, decelerating, and stopping just by adjusting the accelerator pedal, and some users have reported that it improves electric energy consumption. We will use a typical BEV in Japan to drive around Utsunomiya city with and without the one-pedal function, and report on the effects it has on electric energy consumption characteristics.

Evaluation Review of a Chassis Dynamometer System for xEV Testing

Toshinobu Furuta (Meidensha)･Hisakazu Suzuki (NALTEC)･Isamu Inoue (Ono Sokki)･Yasuhiro Ogawa (HORIBA)･Hideyuki Kuba (Mazda)･Kenji Sato (Toyota Motor)･Yasuhito Takemura (Daihatsu Motor)･Masato Taniwaki (Suzuki Motor)･Shohei Nakagawa (Honda Motor)･Noriaki Nakate (Japan Automobile Transport Technology Accociattion)･Masaki Naruke (JARI)･Kosuke Tashiro (Mitsubishi Motors)･Takeo Horikawa (SUBARU)･Keiichi Masutani (Nissan Motor)･Akira Noda (Former Japan Automobile Transport Technology Accociattion)

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.
Therefore, we investigate and study the requirements of the 4WD chassis dynamometer required to evaluate the actual driving characteristics of xEVs and the concept of creating an evaluation method.

Optimization of Speed Change Pattern for Improving Electricity Consumption of Electric Heavy-duty Vehicles and Verification through Actual Vehicle Chassis Dynamometer Testing (Second Report)
-Derivation of Battery Internal Resistance and Cable Resistance Based on Actual Measurements and Additional Consideration of Those Losses-

Yiyuan Fang･Youta Morohashi･Wei-Hsiang Yang･Yushi Kamiya (Waseda University)

In this study, we focused on the eco-driving speed change pattern of electric heavy-duty vehicles. In the first report, we performed the optimization calculation of vehicle driving energy consumption starting from the energy output of the vehicle battery and used chassis dynamometer test data to verify the optimization results. In this paper, we report the results of a similar study with additional consideration of battery internal loss and cable loss.

Research on Hydrogen Flow Rate Measurement for Fuel Consumption Measurement of Heavy-duty FCV
-2^nd Report: Experimental Study to Improve Measurement Accuracy in Transient Test Cycles-

Hisakazu Suzuki (NALTEC)･Yukiji Ohkura (JAMA)

In order to investigate the measurement accuracy of hydrogen consumption using a Coriolis flowmeter, we conducted chassis dynamometer tests using a fuel cell vehicle. In this report, we used high-pressure hydrogen and a hydrogen flow meter with a pressure adjustment mechanism to improve measurement accuracy. As a result, even in the transient driving cycles such as WLTC and JE05, where past tests showed variations, test results by Coriolis flowmeter were obtained that closely matched the measured values using the gravimetric method, which was determined from the difference in the weight of the gas cylinder.

Domestic Trends of Environmental Regulations on Vehicle toward Decarbonization

Takahito Nishimoto (MLIT)

CO2 emissions from vehicles accounted approximately 15% of Japan's total CO2 emissions at FY2021, and, reducing CO2 emissions from vehicle and improving fuel efficiency are important for climate protection. The international and domestic trends of Environmental regulations on Light-Duty Vehicle and Heavy-Duty Vehicle will be presented in this presentation.

Verify and Replicate of Real Driving Wind Flows in Chassis Dynamometer

Nobunori Okui (NATIONAL TRAFFIC SAFETY and ENVIRONMENT Lab.)･Toshimichi Takahashi (Meidensha)

At the development of the internal combustion engine vehicles, we usually use the chassis dynamometer. The engine of these vehicle is cooling by using the cooling blower. About the electrified vehicles (EVs and FCVs), it is necessary to manage the thermal energy by all the vehicle components when it is driving. Therefore, we need to replicate the real driving wind flows at the whole vehicle by using the cooling blower. In this test, we modified the outlet of the conventional cooling blower and verified the effect of it by using the engine vehicle and the electrified vehicle.

Impact of Vibration Applied to the Vehicle by the Hub Nut Clamp Type Vehicle Restraint Device

Toshimichi Takahashi･Morio Onai･Toshinari Kozeki･Nobuo Okazaki (Meidensha)･Masao Furusawa (F-MA Consulting)

A hub nut clamp type vehicle restraint device is used to secure a vehicle on a chassis dynamometer during testing of completed vehicles. Due to the structure in which bolts are fastened to the wheel hub, vibrations that differ from those experienced on actual roads are generated. The effects of vibration on the vehicle were verified by conducting Operational Modal Analysis and Experimental Modal Analysis.