Auxiliary Brake Apparatus by Air Compression and Release for Stop of Heavy FCV Regenerative Brake (4th Report)
-Side Clearance Seal and Exhaust Air Reuse System for Supercharged Intake Air Adoption-

Chinatsu Sano･Daisuke Maeyama･Toshinori Fujita･Takashi Shibayama (Tokyo Denki University)

A simple structure auxiliary brake by utilizing air compression and release cycle had been proposed in last three reports to prepare for the case of FCV truck regenerative brake failure . In this report, two important challenges towards practical application for the new brake will be reported. The one is exhaust air reuse system for obtaining super charged inlet air to reduce external compressor capacity. And the other is abolition of O-ring to increase reliability by replacing side clearance seal function between piston and cylinder side surface. The test result will be reported.

Study of Abnormality Detection Method using Dual Motor System for EV
-Detection of Motor Torque Decrease by Planetary Gears-

Makoto Kusakabe･Teruhiko Nakazawa･Yasumitsu Osada･Haruhiro Hattori (Toyota Central R&D Labs.)

We propose an anomaly detection method for an EV drive system that combines the power of two motors using a planetary gear.
This system has cooperative control that uses the output torque and the rotational speed difference between the two motors as target values.
We devised a method to detect an anomaly accompanied by a decrease in the torque of one motor from this control variable change.
We conducted a test on an actual machine and confirmed that it is possible to accurately detect the decrease in torque due to a rise in rotor temperature.

Effect of Power Source and Transmission Mechanism on WLTC Electric Consumption of BEV

Yasuo Moriyosihi (Sustainable Engine Research Center / Chiba University)･Minoru Ohno･Mutsumi Mizushima･Tatsuya Kuboyama (Chiba University)

The study of changing combination of motor/generator and gearbox is actively conducted to improve the specific electric consumption of BEV. In this study, OpenModelica model provided by TRAMI was used to predict the specific electric consumption in both steady run and WLTC cycle. As a result, it was quantitatively found that i) WLTC ranking does not necessarily accord with steady one, ii) the ring gear output is good when using planetary gear system and iii) a combination of 2 motor and multi-speed is the best in specific electric consumption.

Realizing Shift Control Adaptation through Transmission-iLS

Daiki Sato･Kohei Dodo･Kenichiro Tsukamoto･Daisuke Kogure･Kazuya Arakawa (Toyota Motor)

Shift control adaptation for powertrains is crucial for capturing vehicle transient behavior, and it often relies on actual vehicle evaluations. To improve development efficiency through early completion, we developed a Hardware-in-the-Loop facility utilizing physical models and high-response dynamometers to replicate gear shift behavior, enabling shift control adaptation without actual vehicle and engine. We also showcase an example where the gear shift performance is predicted using the simulation model that incorporates the obtained results.

Mechanism Analysis of Vehicle Dynamics using Front Wheel Speed-up System for AWD

Akira Ono･Tomohiro Shimizu･Susumu Ito･Yusuke Kakihara･Masami Oguri･Yoshinobu Yamazaki･Yusuke Yabusaki･Hirofumi Kawarazaki･Ryouji Aoki (SUBARU)

The effect of restraining rotation ratio between front and rear wheels for all wheel drive vehicle is well known as improving vehicle dynamics in cornering situation according to previous research.
This paper describes that mechanism analysis of torque transfer phenomena between front and rear axle through the propeller shaft and effect of the vehicle dynamics on the snowy road with the front wheel speed-up system.