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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Automotive Engineers
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Journal DOI :
The Korean Society of Automotive Engineers
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Volume & Issues
Volume 23, Issue 6 - Nov 2015
Volume 23, Issue 5 - Sep 2015
Volume 23, Issue 4 - Jul 2015
Volume 23, Issue 3 - May 2015
Volume 23, Issue 2 - Mar 2015
Volume 23, Issue 1 - Jan 2015
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Lane Detection-based Camera Pose Estimation
Jung, Ho Gi ; Suhr, Jae Kyu ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 463~470
DOI : 10.7467/KSAE.2015.23.5.463
When a camera installed on a vehicle is used, estimation of the camera pose including tilt, roll, and pan angle with respect to the world coordinate system is important to associate camera coordinates with world coordinates. Previous approaches using huge calibration patterns have the disadvantage that the calibration patterns are costly to make and install. And, previous approaches exploiting multiple vanishing points detected in a single image are not suitable for automotive applications as a scene where multiple vanishing points can be captured by a front camera is hard to find in our daily environment. This paper proposes a camera pose estimation method. It collects multiple images of lane markings while changing the horizontal angle with respect to the markings. One vanishing point, the cross point of the left and right lane marking, is detected in each image, and vanishing line is estimated based on the detected vanishing points. Finally, camera pose is estimated from the vanishing line. The proposed method is based on the fact that planar motion does not change the vanishing line of the plane and the normal vector of the plane can be estimated by the vanishing line. Experiments with large and small tilt and roll angle show that the proposed method outputs accurate estimation results respectively. It is verified by checking the lane markings are up right in the bird`s eye view image when the pan angle is compensated.
Simulation Analysis on the Property of Crack Propagation and Growth at High Tension Steel Plate
Kang, Byungmok ; Kim, Jengo ; Lee, Jaehoon ; Cho, Jaeung ; Han, Moonsik ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 471~477
DOI : 10.7467/KSAE.2015.23.5.471
In this study, the property of crack propagation and growth at high tension steel plate existed with center crack is investigated. The behaviors of fracture mechanics due to existence or not of hole near the center crack in specimen and the length of crack length are investigated when the load is applied at the one side end of specimen. Stress, deformation and deformation of this specimen are evaluated through simulation analysis. By the analysis results at this study, stress intensity factors are obtained. The damage happened at machine or structure with crack or defect can be estimated on the basis of study results.
Climbing Angle Estimation in Yawing Motion by UIO
Byeon, Hyeongkyu ; Kim, Hyunkyu ; Kim, Inkeun ; Huh, Kunsoo ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 478~485
DOI : 10.7467/KSAE.2015.23.5.478
Availability of the climbing angle information is crucial for the intelligent vehicle system. However, the climbing angle information can`t be measured with the sensor mounted on the vehicle. In this paper, climbing angle estimation system is proposed. First, longitudinal acceleration obtained from gyro-sensor is compared with the actual longitudinal acceleration of the vehicle. If the vehicle is in yawing motion, actual longitudinal acceleration can`t be approximated from time derivative of wheel speed, because lateral velocity and yaw rate affect actual longitudinal acceleration. Wheel speed and yaw rate can be obtained from the sensors mounted on the vehicle, but lateral velocity can`t be measured from the sensor. Therefore, lateral velocity is estimated using unknown input observer with nonlinear tire model. Simulation results show that the compensated results using lateral velocity and yaw rate show better performance than uncompensated results.
Development of a Battery Model for Electric Vehicle Virtual Platform
Kim, Sunwoo ; Jo, Jongmin ; Han, Jaeyoung ; Kim, Sung-Soo ; Cha, Hanju ; Yu, Sangseok ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 486~493
DOI : 10.7467/KSAE.2015.23.5.486
In this paper, a battery model for electric vehicle virtual platform was developed. A battery model consisted of a battery cell model and battery thermal management system. A battery cell model was developed based on Randles equivalent circuit model. Circuit parameters in the form of 3D map data was obtained by charge-discharge experiment of Li-Polymer battery in various temperature condition. The developed battery cell model was experimentally verified by comparing voltages. Thermal management system model was also developed using heat generator, heat transfer and convection model, and cooling fan. For verification of the developed battery model in vehicle level, the integrated battery model was applied in to EV(electric vehicle) virtual platform, and virtual driving simulation using UDDS velocity profile was conducted. The accuracy of the developed battery model has been verified by comparing the simulation results from EV platform with the experimental data.
Evaluation of the Energy Efficiency of the Air Engine
Park, Jaehyeon ; Baek, Jehyun ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 494~501
DOI : 10.7467/KSAE.2015.23.5.494
Nowadays, many people are trying to develop eco-friendly engines such as the electric motor and the air engine because the I.C. engine cause a lot of pollutants. Nevertheless of these effort, there are few evaluation and comparison of these engines to conventionally used I.C. engines. Because of this, it is difficult to determine that the eco-friendly engines are really energy saving engines. In this paper, the efficiency of the air engine is calculated. The air engine does not cause environmental pollution problem because it uses "Compressed air". Due to the air engine operated at a low temperature and spark-free condition, this engine can be used in extreme condition for safety. Despite the many advantages of the air engine, there are few analysis on the air engine because of an air engine is low energy density.
Diesel Engine Intake Port Analysis Using Reverse-engineering Technique
Kim, Chang-Su ; Park, Sung-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 502~507
DOI : 10.7467/KSAE.2015.23.5.502
In this paper, we built a three-dimensional model by applying reverse engineering techniques on targeting the intake port of 2900cc class diesel engine before that three-dimensional design technique is applied. The performance of the intake port is predicted and analysed using the computational flow analysis. Flow Coefficient and Swirl Ratio have been analyzed for two intake port models. One is the intake port for the diesel engine with plunger-type fuel system, and the other is for the diesel engine with CRDI fuel system. Computational result shows that the Flow Coefficient of the intake port with CRDI fuel system is increased upto 10 percentage compared with that with plunger-type. Also, the intake port with plunger-type has high Swirl Ratio at high valve lift, and the intake port with CRDI fuel system has high Swirl Ratio at relatively low valve lift. It is believed that because of high performance of the fuel injector, the intake port with CRDI fuel system is designed for more air amount and not much swirl flow at high valve lift. However, high swirl flow is required at low valve lift for initial fuel and air mixing. The result of this study may be useful for the re-manufacturing industry of automotive parts.
Analysis of Powertrain Efficiency for Input Split Type Hybrid Electric Vehicle considering Planetary-gear Efficiency
Kim, Jeongmin ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 508~514
DOI : 10.7467/KSAE.2015.23.5.508
In this paper, the powertrain efficiency is analyzed for the input split type hybrid electric vehicle. For considering the powertrain loss, the power loss models of planetary gear and motor are applied. And, the mathematic equations of powertrain speed and torque are found by using the lever analogy. With the above models and equations, the powertrain efficiency is analyzed for the 0 to 180 km/h vehicle velocity range. From the analysis results, it is found that the transmission efficiency with the power loss of planetary gear is smaller maximum 2.1% than the transmission efficiency without the power loss of planetary gear.
Fabrication and Evaluation of the SnO
Based Gas Sensor for CO and NOx Detection
Kim, Man Jae ; Lee, Yu-Jin ; Ahn, Hyo-Jin ; Lee, Sang Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 515~523
DOI : 10.7467/KSAE.2015.23.5.515
In this paper, we fabricated and evaluated the gas sensor for the detection of CO gas and
gas among the vehicle exhaust emission gasses. The
(tin dioxide) layer is used as the detection material, and the thin-film type and the nano-fiber type layers are deposited with various thicknesses using sputtering method and electro spinning method, respectively. The experiments are performed in the chamber where the gas concentration is controlled with mass flow controller. The fabricated devices are applied to the CO and
gas, where the device with the thinner
layer shows better sensitivity. The nano-fiber has the larger surface area, and the shorter response time and recovery time are obtained. From the experimental results, both types of gas sensors successfully detect CO and
gases, which can be applied to measure those gases from the vehicle emissions.
A Study on Design and Dynamic Characteristics of Tearing Tubes Applied in Tram
Choi, Jiwon ; Kwon, Taesoo ; Jung, Hyunseung ; Kim, Jinsung ; Kwak, Jaeho ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 524~536
DOI : 10.7467/KSAE.2015.23.5.524
The paper aims to design and verify tearing tube type energy absorption device applied in tram to ensure safety in case of collision accident. Energy capacity of tearing tube is determinated based on EN15227 and Standard Collision Scenarios Criterion in Detail in Republic of Korea. Tearing tube is designed based on theoretical model suggested by X.Huang et al. and assumption by T.Y. Reddy et al. Real scale collision tests are conducted to analyze the energy absorption characteristics and deformation mode. Bending of curl tips is absorbed collision energy when curl tips and tube body are contacted to each other from the tests and we suggest and include the formula on bending of curl tips in theoretical model.
Modification of Hybrid Diesel Vehicle and Its Effect on the Exhaust Emissions
Kwon, Soonho ; Lim, Jongsoon ; Lee, Hyunwoo ; Lee, Jeonghoon ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 537~544
DOI : 10.7467/KSAE.2015.23.5.537
The effects of the modification of hybrid vehicle components on diesel exhaust emissions were investigated in this study. We examined the changes in exhaust emissions and the fuel consumption (FC) caused by the modification of generator (alternator) and motors. Exhaust emissions such as black carbon (BC), HC,
were measured not only in idle state but also on an actual urban road as well as on a chassis dynamometer. BC,
and HC emissions increased by 95%, 27% and 34% respectively when the generator charged the battery in the idle condition. BC and FC decreased in hybrid mode on the actual urban road partly because the motors were used to assist the diesel engine. In addition, the decreases in exhaust emissions and FC were also evident in the hybrid mode when the vehicle was tested on the chassis dynamometer.
A Design of the Cooling Channel in the Bipolar Plate of PEMFC Using Experimental Design Method
Zhang, Xia ; Kwon, Oh-Jung ; Oh, Byeong Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 545~552
DOI : 10.7467/KSAE.2015.23.5.545
The heat generation in PEMFC is proportional to the electrical power output. Therefore, when the fuel cell produced the maximum output, the maximum heat was generated. In order to maintain the performance of the fuel cell, thermal management is as important as pressure and humidity conditions of the reactive gas. In this study, considering the thermal management for the maximum output operation, the optimal cooling channel design specifications of bipolar plate are found for the highest cooling performance. In the current bipolar plate research, many studies focused on analyzing various factors individually but there is no more study on the interaction between design factors. In this study, the heat transfer was simulated by COMSOL Multiphysics with the main design factors which are designated shape, width and rib length. One of the experimental design methods, general full factorial design method, was used to analyze the main factor and interaction on average temperature and maximum temperature for the design specification of fuel cell bipolar plate. When analysis result shows that all of these three factors are highly important, it can confirm that the interaction occurs between the factors.
A Study on Prevention of Secondary Collision considering Failure of Brake Actuator
Yang, Heecheol ; Kim, Dooyong ; Kang, Taewan ; Soh, Minwoo ; Kwon, Jaejoon ; Park, Kihong ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 5, 2015, Pages 553~563
DOI : 10.7467/KSAE.2015.23.5.553
Reportedly the fatality rate from secondary collision is six times higher than the average fatality rate from all traffic accidents. So prevention of the secondary collision is attracting significant attention from automotive industries. However, the secondary collision prevention systems that have been developed are not considering possibility of brake actuator failure that can occur by the impact during the initial collision. In this paper, a new system has been developed that could prevent secondary collision even in case of brake actuator failure by taking advantage of still operating actuators. In this system, a steering control is performed for maintaining a lane by using linear quadratic regulator. Additionally, the system attempts differential brake control with the remaining braking capability to stop the vehicle in the shortest distance. Through simulation in various collision scenarios, the system has demonstrated significant potential of preventing secondary collision that could otherwise have resulted in severe fatality.