• Title/Summary/Keyword: Driving Force Coefficient

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Re-adhesion control performance improvement for a vector controlled electric motor coach (백터제어 전동차의 재점착 성능개선에 관한 연구)

  • Byun Yeun-Sub;Lee Byung-Song;Han Kyung-Hee;Bae Chang-Han
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.1455-1460
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    • 2004
  • In electric motor coaches, when the adhesion force coefficient between rail and driving wheel decreases suddenly, the electric motor coach has slip phenomena. The characteristics of adhesion force coefficient is strongly affected by the conditions between rails and driving wheels, such as moisture, dust, and oil on the rails and so on. This paper proposes the vector control structure for the improved re-adhesion control with paralleled control of induction motors under the sudden variation of the adhesion force coefficient.

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Anti-Slip Control for Wheeled Robot Based on Disturbance Observer (외란 관측기를 이용한 이동 로봇의 슬립 제어)

  • Kwon, Sun-Ku;Huh, Uk-Youl;Kim, Jin-Whan;Kim, Hak-Il
    • Proceedings of the KIEE Conference
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    • 2004.05a
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    • pp.50-52
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    • 2004
  • Mobility of an indoor wheeled robot is affected by adhesion force that is related to various floor conditions. When the adhesion force between driving wheels and the floor decreases suddenly, the robot has slip state. First of all, this paper models adhesion characteristics and slip in wheeled robot. Secondly, the paper proposes estimation method of adhesion force coefficient according to slip velocity. In oder to overcome this slip problem, optimal slip velocity must be decided for stable movement of wheeled robot. The paper proposes an anti-slip control system based on an ordinary disturbance observer, that is, the anti-slip control is achieved by reducing the driving torque enough to give maximum adhesion force coefficient. These procedure is implemented using a Pioneer 2-DXE parameter.

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Re-adhesion Control for Wheeled Robot Using Fuzzy Logic (퍼지 제어기를 이용한 이동 로봇의 재점착 제어)

  • Kwon, Sun-Ku;Huh, Uk-Youl;Kim, Hak-Il
    • Proceedings of the KIEE Conference
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    • 2004.07d
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    • pp.2423-2425
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    • 2004
  • Mobility of an indoor wheeled robot is affected by adhesion force that is related to various floor conditions. When the adhesion force between driving wheels and the floor decreases suddenly, the robot has slip state. First of all, this paper models adhesion characteristics and slip in wheeled robot. Secondly, the paper proposes estimation method of adhesion force coefficient(AFC) according to slip velocity. In order to overcome this slip problem, optimal slip velocity must be decided for stable movement of wheeled robot. The paper proposes an anti-slip control system based on an ordinary disturbance observer, that is, the re-adhesion control is achieved by reducing the driving torque enough to give maximum adhesion force coefficient. fuzzy logic controller(FLC) is petty useful with slip through that compare fuzzy with PI control for the controller performance. These procedure is implemented using a Pioneer 2-DXE parameter.

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A Study of Tire Road Friction Estimation for Controlling Rear Wheel Driving Force of 4WD Vehicle (4WD 차량의 후륜 구동력 제어를 위한 구동시 노면마찰계수 추정에 관한 연구)

  • Park, Jae-Young;Shim, Woojin;Heo, Seung-Jin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.5
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    • pp.512-519
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    • 2016
  • In this study, the tire road friction estimation(TRFE) algorithm for controlling the rear wheel driving force of a 4WD vehicle during acceleration is developed using a standard sensor in an ordinary 4WD passenger car and a speed sensor. The algorithm is constructed for the wheel shaft torque, longitudinal tire force, vertical tire force and maximum tire road friction estimation. The estimation results of shaft torque and tire force were validated using a torque sensor and wheel force transducer. In the algorithm, the current road friction is defined as the proportion calculated between longitudinal and vertical tire force. Slip slop methods using current road friction and slip ratio are applied to estimate the road friction coefficient. Based on this study's results, the traction performance, fuel consumption and drive shaft strength performance of a 4WD vehicle are improved by applying the tire road friction estimation algorithm.

The slip & slide simulator for train using induction motors (유도전동기를 이용한 열차의 공전활주 모의 시험기)

  • Byun, Yeun-Sub;Kim, Min-Soo;Lee, Young-Hoon;Kim, Young-Chol
    • Proceedings of the KIEE Conference
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    • 2006.07d
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    • pp.1879-1880
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    • 2006
  • In electric motor coaches, when the adhesion force between rail and driving wheel decreases suddenly, the electric motor coach has slip phenomena. The characteristics of adhesion force coefficient is strongly affected by the conditions between rails and driving wheels, such as moisture, dust, and oil on the rails and so on. This paper proposes the simulation system for slip & slide test using virtual train. We can easily research the adhesion characteristics and adhesion control method with this equipment under the sudden variation of the adhesion force coefficient.

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A Study on the Factors that Influence Jack Knife Phenomenon of Articulated Vehicles (연결(連結) 차량(車輛)의 재크나이프 현상에 영향(影響)을 미치는 인자(因子)인자에 대한 연구)

  • Kang, D.M.;Ahn, S.M.
    • Journal of Power System Engineering
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    • v.11 no.2
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    • pp.58-63
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    • 2007
  • Vehicular safety and occupant injury have been of considerable interest to the public. The dynamic response of an articulated vehicle is different from that of single body vehicle due to its geometric and inertia properties. Articulated vehicles have the tendency to jackknife if they lose driving safety. Influence of factors for driving safety of an articulated vehicle(Tractor-Semitrailers) has been analysed by the EDVTS, a kinetic analysis program for an articulated vehicle. EDVTS permits an analyst to investigate the effect of many variables in a short period of time, and enables to obtain an accurate explanation of driving safety. The factors used in the analysis include the load, friction coefficient, tire flat, increase of braking force, and trailer geometry. Based on the results, the articulation angle and driving safety were influenced remarkably by the load, coefficient of friction, increase of braking force. However, trailer geometry, such as length and width, did not affect articulation angle and driving safety

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The Estimation of Fatigue Strength of Structure with Practical Dynamic Force by Inverse Problem and Lethargy Coefficient (구조물의 피로강도평가를 위한 역문제 및 무기력계수에 의한 실동하중해석)

  • 양성모;송준혁;강희용;노홍길
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.1
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    • pp.106-113
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    • 2004
  • Most of mechanical structures are composed of many substructures connected to one another by various types of mechanical joints. In automotive engineering, it is important to study these connected structures under various dynamic forces for the evaluations of fatigue life and stress concentration exactly. In this study, the dynamic response of vehicle structure to external forces is classified an inverse problem involving strains from the experiment and the analysis. The practical dynamic forces are determined by the combination of the analytical and experimental method with analyzed strain by quasi-static finite element analysis under unit force and with measured strain by a strain gage under driving load, respectively. In a stressed body, inter-molecular chemical bonds are failed beyond the certain magnitude. The failure of molecular structure in material is considered as a time process of which rate is determined by mechanical stress. That is, the failure of inter-molecular chemical bonds is the fatigue lift of material. This kinetic concept is expressed as lethargy coefficient. And S-N curve is obtained with the lethargy coefficient from quasi-static tensile test. Equivalent practical dynamic force is obtained from the identification of practical dynamic force for one loading point. Using the practical dynamic force and S-N curve, fatigue life of a window pillar is analyzed with FEM under the identified force by the procedure of above mentioned.

Analysis of the Frictional Behavior of Rubber Block (고무 블록의 마찰 거동 해석)

  • Kim, Doo-Man;Yoo, Hyun-Seung
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.14 no.3
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    • pp.16-22
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    • 2006
  • The friction and wear of tire determined by frictional behavior of tire tread that translate driving force, cornering force and braking force between automobile and road as a result of frictional behavior of each tread block. The tire tread block is representative case of rubber block doing frictional behavior. In this paper, frictional behavior of rubber block under compressive force and shear force was analytically obtained by using slip starting position parameter instead of friction coefficient which is uncertain to express exact value between rubber and other surfaces yet. And local coefficients of friction were calculated as a function of compressive force, shear force, shear modulus of rubber, shape factor and slip starting position.

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A Study on the Estimation of Frictiom Coefficient between Tire and Road Surface Using Running Car data (실차 데이터를 이용한 차륜과 노면간의 마찰계수 예측에 관한 연구)

  • 우관제;산기준일
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.6
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    • pp.207-213
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    • 1999
  • In this study, the possibility of estimation of friction coefficient between tire and road surface using running car data are checked. To get necessary data, such as tire and car velocities and braking force, a test car is driven with certain magnitude of decelerations from pre-set initial velocities to stop . The data are used to estimate friction coefficient with property chosen parameters , e.g,, driving stiffness, pressure distribution functions, etc. Experimental results show that running data car be used with properly chosen parameters to estimate friction coefficient.

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A Study on the Characteristics of Accumulator Type Fuel Injection System with Spool Valve (스풀밸브를 이용한 축압식 연료분사계의 작동특성에 관한 연구)

  • Choi, Y.H.;Lee, J.H.;Yoon, S.J.
    • Journal of ILASS-Korea
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    • v.6 no.1
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    • pp.1-8
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    • 2001
  • Fuel injection system is very important in diesel combustion. Recently electronic control of fuel injection system and common rail systems are introduced to reduce the emission and to increase the energy efficiency from diesel engine by control of the injection timing and duration. In this study, evaluation possibility of the system for electronic control by spool valve, one of the accumulator type injection systems with spool valve using solenoid was composed and the operating characteristics were investigated to evaluate the effects of spring coefficient, initial spring force, solenoid driving time, fuel supply pressure on the injection timing and duration. We could confirm the capability that diesel injection was electronically controlled by spool valve.

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