• Title/Summary/Keyword: used automotive tire

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Vehicle Stabilization Using MPC Based on Nonlinear Tire Model (비선형 타이어모델 기반 MPC를 이용한 차량 안정화)

  • Song, Yuho;Kim, Hansu;Kim, Seungki;Kim, Youngwoo;Lee, Tae Hee;Huh, Kunsoo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.6
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    • pp.730-736
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    • 2016
  • Recent research suggests the various applications of Model Predictive Control on vehicle systems. In numerous cases, nonlinear tire models such as the Magic Formula, which are highly complex and are more detailed than necessary, are used. This paper presents a nonlinear tire model that excludes the region of negative slope but expresses the nonlinear properties of tire well enough for tracking the lane of a racing course. The proposed inverse tire model can also be used to calculate the slip angle from the tire force. Thus, the model can be utilized to design the Model Predictive Controller.

Development of Tire Vertical Force Estimation Algorithm in Real-time using Tire Inner Surface Deformation (타이어 내부 표면 변형량을 이용한 타이어 수직하중 실시간 추정 알고리즘 개발)

  • Lee, Jaehoon;Kim, Jin-Oh;Heo, Seung-Jin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.3
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    • pp.142-147
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    • 2013
  • Over the past few years, intelligent tire is developed very actively for more accurate measurement of real-time tire forces generated during vehicle driving situation. Information on the force of intelligent tire could be used very usefully to chassis control systems of a vehicle. Intelligent tire is based on deformation of tire's inner surface from the waveform of a SAW, or Surface Acoustic Wave. The tire vertical force is estimated by using variance analysis of sensor signals. The estimated tire vertical force is compared with the tire vertical force generated during vehicle driving situation in real-time environment. The scope of this paper is a correlation study between the measured sensor signals and the tire vertical force generated during vehicle driving situation.

An Experimental Study of Tire Safety & Economical Efficiency with Respect to Inflation Pressure (공기압에 따른 타이어의 안전성 및 경제성에 관한 실험적 연구)

  • Hong, Seung-Jun;Lee, Ho-Guen
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.1
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    • pp.8-13
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    • 2010
  • Many vehicles have significantly under-inflated tires, primarily because drivers infrequently check their vehicles' tire pressure. When a tire is used while significantly under-inflated, its sidewalls flex more and the tire temperature increases, increasing stress and the risk of failure. In this study we evaluated tire safety and economical efficiency at various inflation pressure. For tire safety we performed FMVSS indoor durability test, measurement of rolling tire temperature, braking performance at dry/wet road condition, and rolling resistance test for economical efficiency. Results show that low pressure decreases tire durability of both speed-increase condition and load-increase condition. Heat temperature of rolling tire increases as pressure decreases and significantly under-inflated tires cause increase of vehicle's stopping distance at wet road condition. Also Under-inflation increases the rolling resistance of a tire and, correspondingly, decreases vehicle's fuel economy.

Failure Studies on the Wear Scars of an Automotive Tire (차량용 타이어의 마멸손상에 관한 고장사례 연구)

  • Lee, II-Kwon;Kim, Chung-Kyun
    • Tribology and Lubricants
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    • v.23 no.5
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    • pp.228-233
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    • 2007
  • This paper presents the case studies on the friction related wears of an automotive tire, which is strongly connected to the safety and comfort of a driver during a running of a car. Wear scars of a tire tread are affected by various causes such as an air pressure, a wheel alignment, a driving speed, road conditions, starting and braking habits of a driver. The data were collected from used tires for a replacement at the car service center. Most of the wear problems came from the improper repair and adjustment of revolving components, which cause an unbalanced wear of a tread part of a tire. Thus, the regular checking of a tire radically reduces the wear scars of a tire and may increase a driving safety and a fuel economy of a car and a wear life of a tire.

The Study on PRAT Performance due to Tire Pattern Shapes using Steady State Rolling Analysis Method (정상 상태 롤링 해석 기법 적용을 통한 타이어 패턴 형상에 따른 PRAT 특성 연구)

  • Sung, Ki-Deug;Park, Hyun-Man;Koo, Byong-Kook;Cho, Choon-Tack
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.5
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    • pp.15-21
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    • 2008
  • It is generally known that the PRAT(Plysteer Residual Aligning Torque) is one of indicating a performance factors of a tire for assessing the vehicle pull, also tire pattern shape, which means lateral groove angle, is very important tire design factor in relation to the PRAT. Lateral grooves of tire pattern are widely divided into center and shoulder parts. So, this paper has studied the correlation between the PRAT and their lateral groove angles using FEM. Especially, the steady state rolling analysis among tire rolling analysis methods has been used for the PRAT performance study. Firstly, analysis result data have been compared with the experimental data to validate FE analysis for PRAT. Next, the PRAT due to the lateral groove angle about PCR(Passenger Car Radial) tire and SUV tire has been analyzed. The tendency of the PRAT due to the lateral groove angles can be used as a guide line for the tire design in relation to vehicle pull.

Tire Lateral Force Estimation System Using Nonlinear Kalman Filter (비선형 Kalman Filter를 사용한 타이어 횡력 추정 시스템)

  • Lee, Dong-Hun;Kim, In-Keun;Huh, Kun-Soo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.6
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    • pp.126-131
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    • 2012
  • Tire force is one of important parameters which determine vehicle dynamics. However, it is hard to measure tire force directly through sensors. Not only the sensor is expensive but also installation of sensors on harsh environments is difficult. Therefore, estimation algorithms based on vehicle dynamic models are introduced to estimate the tire forces indirectly. In this paper, an estimation system for estimating lateral force and states is suggested. The state-space equation is constructed based on the 3-DOF bicycle model. Extended Kalman Filter, Unscented Kalman Filter and Ensemble Kalman Filter are used for estimating states on the nonlinear system. Performance of each algorithm is evaluated in terms of RMSE (Root Mean Square Error) and maximum error.

A Study on Effect Analysis and Design Optimization of Tire and ABS Logic for Vehicle Braking Performance Improvement (차량 제동성능 개선을 위한 타이어 인자 분석 및 최적설계에 대한 연구)

  • Ki, Won Yong;Lee, Gwang Woo;Heo, Seung Jin;Kang, Dae Oh;Kim, Ki Woon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.5
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    • pp.581-587
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    • 2016
  • Braking is a basic and an important safety feature for all vehicles, and the final braking performance of a vehicle is determined by the vehicle's ABS performance and tire performance. However, the combination of excellent ABS and tires will not always ensure good braking performance. This is due to the fact that tire performance has non-linearity and uncertainty in predicting the repeated increase and decrease of wheel slip when activating the ABS, thus increasing the uncertainty of tire performance prediction. Furthermore, existing studies predicted braking performance after using an ABS that used a wheel slip control as a controller, which was different from an actual vehicle's ABS that controlled angular acceleration, therefore causing a decrease in the prediction accuracy of the braking performance. This paper reverse-designed the ABS that controlled angular acceleration based on the information on brake pressure, etc., which were obtained from vehicle tests, and established a braking performance prediction analysis model by combining a multi-body dynamics(MBD) vehicle model and a magic formula(MF) tire model. The established analysis model was verified after comparing it with the results of the braking tests of an actual vehicle. Using this analysis model, this study analyzed the braking effect by vehicle factor, and finally designed a tire that had optimized braking performance. As a result of this study, it was possible to design the MF tire model whose braking performance improved by 9.2 %.

Liquefaction Characteristics in Supercritical Decomposition and Extraction of Used Automotive Tire (초임계유체에 의한 폐타이어 분해와 추출에서 오일화의 특성)

  • Kang, W.S.;Kim, J.K.;Kim, I.S.;Park, P.W.
    • Elastomers and Composites
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    • v.34 no.4
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    • pp.350-359
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    • 1999
  • Conversion and oil-yield of a used automotive tire sample in supercritical decomposition and extraction for three solvents such as water, 28% ammoina solution and ammonia, were compared. Supercritical extraction with ammonia gave the highest conversion and oil-yield at the same temperature and pressure. In this paper, supercritical ammonia was used as major solvent and tetralin acting as hydrogen-donor, was used as cosolvent. As the amount of tetralin increased, oil-yield was Increased. When a tire sample was extracted by supercritical ammonia, oil-yield was 48.8% at $280^{\circ}C$, 22.3MPa. But when the weight ratio of tetralin to tire sample (weight of tetralin/weight of tire sample) was 5, oil-yield was 61.2% at $280^{\circ}C$ and 22.3 MPa. These phenomena indicate that as radicals produced in supercritical decomposition become stable, the polymerization and the second decomposition of products may be inhibited. Supercritical extraction of a tire sample swollen by tetralin gave high oil-yield although the amount of tetralin was a little.

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PREDICTION OF SOUND RADIATION FROM TIRE TREADBAND VIBRATION

  • Kim, B.S.
    • International Journal of Automotive Technology
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    • v.2 no.1
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    • pp.33-38
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    • 2001
  • The noise generated from a treadband mechanism of a tire has been the subject of this research. In particular, the treadband has been treated as an infinite tensioned beam resting on an elastic foundation which includes damping. The main objective is here to predict the sound power generated from a system mentioned above by locating harmonic point forces representing the excitation of treadband at the contact patch. It is possible to predict the sound power radiated from this structure by wavenumber transformation techniques. To find out the minimum radiated sound power, All parameters were varied. Thus this model can be used as a tire design guide for selecting parameters which produce the minimum noise radiation.

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An Experimental Study on the Characteristics of Air Flow Velocity Distritutions Inside a Rolling Tire -Unloaded Rolling Tire- (회전하는 타이어 내부공기의 유동특성에 관한 실험적 연구 -무부하 회전구동 타이어-)

  • 김윤제;조정현
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.6
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    • pp.174-181
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    • 1999
  • in order to elucidate the characteristic of velocity distribution of the cavity air. Exploratory tests were conducted on an unloaded rolling radial tire operated at various speeds and inflation pressure. A hot-wire anemometer, rotating with the tire, was used to measure the flow velocity inside the tire cavity. Tow different types of experiments were performed ; one for the effects of rolling speed with constant inflation pressure, the other for the various cavity pressures with constant rolling speed. Experimental results are given as plots of the mean velocity distributions versus the distance from the rim. It is observed that the magnitude of mean velocity in the cavity air shows increasing natures with the increasing of the inflation pressures and rolling speeds.

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