Measuring Braking Stiffness with Intelligent Tires

Kazunori Onishi･Syunnosuke Fukumitsu･Akira Sibuya･Masahiro Higuchi･Hiroshi Tachiya (Kanzawa univ.)･Naoki Sekino･Kenta Konishi･Masakatsu Kakura･Daisuke Yokoi (Suzuki Motor)

In this study, the triaxial loads acting on the tire ground surface were measured from wheel strain, together with the vehicle's running condition during straight driving under various road surface conditions. From the measured results, the relation between the road friction coefficient and slip ratio was derived, and the braking stiffness was evaluated.

Measuring Cornering Stiffness with Intelligent Tires

Ryosuke Urasaki･Taiga Horie (Kanazawa Univ.)･Akira Sibuya･Masahiro Higuchi･Hiroshi Tachiya (Kanzawa univ.)･Naoki Sekino･Masakatsu Konishi･Masakatsu Kakura･Daisuke Yokoi (Suzuki Motor)

This study presents a method to determine the triaxial load acting on the tire contact surface from the wheel strain of the tire, and to measure the tire contact load accurately when the vehicle is turning. In addition, the road friction coefficient is obtained from the tire contact load measured under various conditions, and the cornering stiffness is calculated.

A Highly Robust Tire Contact Load Measurement Method Utilizing Wheel Deformation

Shungo Tomita･Keisuke Maeno (Kanazawa Univ.)･Akira Sibuya･Masahiro Higuchi･Hiroshi Tachiya (Kanzawa univ.)･Naoki Sekino･Kenta Konishi･Masakatsu Kakura･Daisuke Yokoi (Suzuki Motor)

This study proposes a measurement method for tire-road force that is highly robust against measurement noise. This method enables tire-road force measurement using only tire rotation speed to identify tire revolutions and strain measurements occurring on the wheel. Measurement experiments were conducted during straight-line driving, and the usefulness of this method was confirmed by quantitative evaluation of the measured tire ground load values against true values.

Measurement of Tire Contact Load Using a Strain-Sensing RFID Tag Sensor

Tomoki IKEGAMI･Syogo Tacguchi (Kanazawa Univ.)･Masahiro Higuchi･Hiroshi Tachiya (Kanzawa univ.)･Kunihiro Komaki･Tomu Tanabe･Youichi Saito (Murata)

RFID tags are used for inventory management of goods as a technology to exchange information wirelessly without power supply. In this study, a basic study was carried out to measure the grounding load by embedding an RFID tag sensor with a strain measurement function in a tire, and the result was confirmed.

Investigation of μ–S Characteristics Using an Indoor Flat Road Tire Measurement System

Masami Matsubara (Waseda University)･Daisuke Yokoi (Suzuki Motor)･Takayuki Toyoshima (Honda Racing Corporation)･Takeshi Hotaka (Honda Motor)･Ichiro Kageyama (Nihon University)･Hideki Sakai (Kindai University)･Hiroshi Tachiya (Kanazawa University)･Yoshiho Oda (Ono Sokki)･Kazuaki Inoue (A&D Company)･Masahiko Matsumoto (Kokusai)･Naohiro Ishigami (TOYO TIRE)･Isao Kuwayama (Bridgestone)･Yoshinori Saito (Nihon Michelin Tire)･Haruyuki Suzuki (Sumitomo Rubber Industries)･Naoto Miyashita (The Yokohama Rubber)

In this study, the μ–S characteristics were investigated using an indoor flat road tire measurement system that enables stable control of environmental conditions, including road surface position, vertical load, tire inflation pressure, and water film thickness. The μ–S characteristics were measured under low-speed conditions while varying the dry and wet road surface, vertical load, and tire inflation pressure. The results demonstrated high reproducibility of the μ–S curves regardless of the measurement section, highlighting the superiority of the indoor testing environment.