Performance Evaluation of Flat-Type Dynamometer for Road Simulation Using Driving Force Control of In-Wheel Motor Electric Vehicle

Sakahisa Nagai･Tokikazu Mizuguchi･Yuna Morimoto･Daisuke Gunji･Osamu Shimizu･Hiroshi Fujimoto (The University of Tokyo)･Yuichi Takasaki･Kentaro Kondo･Kohei Tasumoto･Yoshihisa Hojo (Toyo Denki Seizo)

A dynamometer can simulate the vehicle motion by accurately reproducing the reaction force from a road acting on vehicle wheels. An in-wheel motor (IWM) electric vehicle can precisely control the reaction force from a road due to its high torque responsiveness and direct-drive capability. In this paper, the performance of a newly developed flat-type dynamometer that can be installed in a wheel-well is evaluated using the driving force control of an IWM electric vehicle, and the results are compared with those obtained on an actual road.

Road surface simulation evaluation in bench tests using a flat-type dynamometer

Kentaro Kondo･Yuichi Takasaki･Yoshihisa Hojo･Kohei Yasumoto･Kenji Terada･Daisuke Kozakai･Koichi Eitoku (Toyodenki Seizo)

Vehicle bench testing using a dynamometer makes it possible to simulate low-μ road conditions and cornering motion by linking it with a vehicle model. In this paper, we report on simulated control of road conditions using two types of flat-type dynamometers we developed, and on the behavior of the vehicle drivetrain that becomes problematic as the control bandwidth improves, and how to deal with this on the equipment side.

Measurement of Micro-vibration in Rolling Tires using Compressed Sensing DIC

Soma Watahiki (Kozo Keikaku Engineering)･Yuki Kato (Kochi University of Technology)･Masayoshi Otaka (Ono Sokki)･Mitsuki Togoshi･Kohei Choraku (Kozo Keikaku Engineering)･Yoshiho Oda (Ono Sokki)

Image-based measurement of rotating tires faces a trade-off between spatial resolution and frame rate. In this study, we applied “Compressed Sensing DIC,” a technique that reconstructs high-frequency phenomena from low-frame-rate images, to an ultra-high-resolution camera. We report results from the simultaneous measurement of a tire and wheel, successfully visualizing minute vibration modes during rolling.

Vibration Measurement in a Tire-Mounted Protrusion Override Test Using Compressed Sensing DIC

Yuki Kato (Kochi University of Technology)･Soma Watahiki (Kozo Keikaku Engineering)･Masayoshi Otaka (Ono Sokki)･Mitsuki Togoshi (Kozo Keikaku Engineering)･Yoshiho Oda (Ono Sokki)･Kota Matsumura (Kochi University of Technology)

Tyres in motion receive excitation forces from the road surface and exhibit complex vibration behaviour. However, as they are high-speed rotating bodies, it is difficult to measure their vibration using contact sensors with cables. This research therefore developed a method using compressed sensing and digital image correlation to measure the detailed vibration modes and frequency spectra of tyres when they are overriding a tyre-mounted protrusion.

Simultaneous Measurement of Frictional Force Fluctuations and Wear Debris Behavior under Semi-Dry Conditions toward Understanding the Creep-Groan Phenomenon

Hikaru Okubo･junpei Suzuki (Yokohama National University)･Shuhei Tanamachi･Kenta Kurimoto･Yusuke Sunagawa･Yoshiyuki Yamaguchi (Nisshinbo Brake)･Ken Nakano (Yokohama National University)

To elucidate the creep-groan phenomenon that occurs in braking systems, we developed a fundamental experimental platform enabling the simultaneous measurement of frictional force fluctuations and wear debris dynamics under semi-dry sliding conditions—factors believed to be intrinsically linked to this phenomenon. Herein, we report the results obtained from these simultaneous measurements.