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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 24, Issue 5 - Sep 2016
Volume 24, Issue 4 - Jul 2016
Volume 24, Issue 3 - May 2016
Volume 24, Issue 2 - Mar 2016
Volume 24, Issue 1 - Jan 2016
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Strength of Pipe Type Door Impact Beam with Changed Bracket Mounting Method and TRP Application
Kang, Sungjong ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 379~385
DOI : 10.7467/KSAE.2016.24.4.379
Door impact beam plays a key role in minimizing the occupant injury within the side impacted vehicle through preventing intrusion of the impacting vehicle. Steel pipe type door impact beam has been widely adopted since it has simple structure and the overall strength is easily determined according to the pipe size. The brackets welded at pipe ends connect the door impact beam and the door panels by spot welds. In this study, first, the effect of pipe thickness, bracket thickness and door mounting stiffness was respectively analyzed. Next, application of the tailor rolled pipe was examined and several alterations of the bracket mounting method were considered. Application of tailor rolled pipes with superior bracket mounting method showed remarkable strength enhancement and weight reduction possibility in comparison with the current door impact beam.
FPGA-based Traffic Message Delivery System for Car-to-car Communications Using Visible Light Communication Link
Kim, Jong-Young ; Cho, Eunbyeol ; Hwang, Sung-Jo ; Park, Bong-Seok ; Lee, Chung Ghiu ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 386~391
DOI : 10.7467/KSAE.2016.24.4.386
A traffic message delivery system using visible light communication(VLC) link has been demonstrated. The system is proposed to deliver simple traffic messages between cars at low speed. The message set is programmed in an FPGA-based digital board and one of the messages is sent to the other car. Considering the outdoor and indoor environments, the effects of sunlight and fluorescent lamps on received signal waveforms are described. The delivered message is successfully recovered over 2 meter. The link for message delivery can be concatenated.
Study on the Improvement Methods of Engine Efficiency in Hybrid Excavator
Park, Minje ; Min, Kyoungdoug ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 392~400
DOI : 10.7467/KSAE.2016.24.4.392
In this paper, a study based on engine operating conditions versus hybrid excavator engines was conducted about the engine performance and fuel consumption via the 1-D engine simulation model. First of all, engine operating points with performance and emission were determined by driving patterns. The 1-D HFEM(High Frequency Engine Model) was developed for deep insight into engine combustion and the energy conversion phenomena. In accordance with changing operating points, especially High Idle and Rated output conditions, engine parameters and systems such as turbocharger(Waste Gate Turbocharger and Variable Geometry Turbocharger) injection strategies and EGR(Exhaust Gas Recirculation) should be considered. Therefore, various configurations and parametric analysis with optimization methods in hybrid excavator were simulated and optimized by NLPQL(Non-linear Programming by Quadratic Lagrangian algorithm) in 1-D HFEM. As a result, the fuel consumption with the developed hybrid electric excavator engine could be significantly decreased and bsfc(Brake Specific Fuel Consumption) was also reduced about 5 % to 7 % without any performance degradation.
Steering Consuming Energy and Fuel Efficiency Analysis Depending on Steering System Model
Gu, Bonhyun ; Lee, Heeyun ; Park, Yunkyong ; Cha, Sukwon ; Lim, Wonsik ; Jang, Bongchoon ; Bang, Jinseok ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 401~407
DOI : 10.7467/KSAE.2016.24.4.401
For high fuel economy, many kinds of unit in vehicle have been developed. In steering system, as a result, HPS(Hydraulic Power Steering) system has been replaced as EHPS and EPS system. But the structures of these systems are totally different, and that causes the uncertainty of fuel economy evaluation. Therefore we undertake to research to find results and tendency of fuel economy and energy in steering system. For accurate evaluation, we modeled different types of steering systems on same vehicle model. The simulation came into action on various driving cycle. The driving condition is designed to show standby power of pump. Results show differences of fuel efficiency and energy consumption.
Vehicle Orientation Estimation by Using Magnetometer and Inertial Sensors
Hwang, Yoonjin ; Choi, Seibum ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 408~415
DOI : 10.7467/KSAE.2016.24.4.408
The vehicle attitude and sideslip is critical information to control the vehicle to prevent from unintended motion. Many of estimation strategy use bicycle model or IMU integration, but both of them have limits on application. The main purpose of this paper is development of vehicle orientation estimator which is robust to various vehicle state and road shape. The suggested estimator use 3-axis magnetometer, yaw rate sensor and lateral acceleration sensor to estimate three Euler angles of vehicle. The estimator is composed of two individual observers: First, comparing the known magnetic field and gravity with measured value, the TRIAD algorithm calculates optimal rotational matrix when vehicle is in static or quasi-static condition. Next, merging 3-axis magnetometer with inertial sensors, the extended Kalman filter is used to estimate vehicle orientation under dynamic condition. A validation through simulation tools, Carsim and Simulink, is performed and the results show the feasibility of the suggested estimation method.
Robust Design of Engine Head Gasket
Lee, Seungwoo ; Yang, Chulho ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 416~424
DOI : 10.7467/KSAE.2016.24.4.416
A robust design of head gasket is pursued by using FEA model of engine assembly. Engine assembly model consists of cylinder head, block, gasket, and head bolt is constructed to understand a complex behavior of this engine compound. Thermal loading is performed on the assembled engine cylinder and block to obtain temperature field. Firing load is added to the results of heat transfer analysis to simulate the engine operation condition. Temperature filed results from heat transfer analysis are mapped into the structural mesh. Contact pressure distribution along the bead has been monitored for the engine operation condition. Based on the results obtained from the analysis, Taguchi method has been adopted for a robust design process of head gasket. Among the control factors, bolt size affects most robustness of head gasket sealing.
Optimal Welding Design for FSW Based on Micro Strength by MSP Test
Yang, Sungmo ; Kang, HeeYong ; Jeong, Byeongho ; Yu, Hyosun ; Son, Indeok ; Choi, Seungjun ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 425~431
DOI : 10.7467/KSAE.2016.24.4.425
The usage of Friction Stir Welding(FSW) technology has been increasing in order to reduce the weight in automobile industries. Previous studies that investigated on the FSW have focused on the aluminum alloy. In this study, Al6061-T6 alloy plates having 5 mm of thickness were welded under nine different conditions from three tool rotation speeds: 900, 1000 and 1100 rpm, and three feed rates: 270, 300 and 330 mm/min. Specimen size of Micro Shear Punch(MSP) test was
. The mechanical properties were evaluated by MSP test and Analysis of Variance (ANOVA). The specimens were classified by advancing side(AS), retreating side(RS), and center(C) of width of tool shoulder. The optimal welding condition of FSW based on micro strengh was obtained when the tool rotation speed was 1100 rpm and the feed rate was 300 mm/min. The maximum load measured AS, RS, and C in the weldment was measured 554.7 N, 642.9 N, and 579.2 N, respectively.
Whiplash Injury Case Studies through Low Speed Rear-end Crash Tests
Lim, Namkyoung ; Shim, Sangwoo ; Jung, Hyuncheol ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 432~438
DOI : 10.7467/KSAE.2016.24.4.432
Whiplash injuries in low-speed rear-end collisions are the most common injuries and has been a social issue in insurance industry, such as excessive medical claim costs along with exaggerated injuries of victims and treatments from hospitals. According to the Korea Insurance Development Institute reports, the number of claims by rear-end collision was approximately 703,000, which accounts for 53.6 % of the total car-to-car collisions in 2014. Part of the neck injury claims in the Korea car insurance was approximately 28.3 %. Furthermore, approximately 98.4% of the injured persons in rear-end collisions sustained minor injuries under AIS2. In order to improve this situation as well as find out the severity of neck injuries from rear-end collision, the Korea Automobile Insurance Repair Research and Training Center conducted car-to-car rear-end crash tests that striking vehicles(SUV) collided into different sizes of struck-vehicles(small, middle, and large sedan) at the impact speeds of 8 km/h ~ 16 km/h. In order to analyze the whiplash injury, the BioRID-II was seated in each struck-vehicles, and the neck injury criteria(NIC), head contact time, maximum vehicle accelerations, and mean vehicle accelerations were calculated from values from the accelerations of the dummy and the struck-vehicles.
Integrated Chassis Control System of a Rear In-wheel Motor Vehicle
Kim, Hyundong ; Choi, Gyoojae ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 439~446
DOI : 10.7467/KSAE.2016.24.4.439
An in-wheel motor vehicle is a type of car that is equipped with an electric motor for each wheel. It is possible to acquire vehicle stability through a seperate driving torque control per wheel, since it directly generates the driving torque via the wheel motors. However, the vehicle ride comfort and road holding performance worsen depending on the increase of the wheel weights. In order to compensate for the impaired performance, an integrated chassis control system of the rear in-wheel motor vehicle is proposed. The proposed integrated chassis control system is composed of a driving torque control system, a semi-active suspension system, and an ESC system. According to the vehicle dynamic simulation of an in-wheel motor vehicle equipped with the integrated chassis control system, it is found that the system can improve the driving stability, ride comfort, and driving efficiency of the in-wheel motor vehicle.
A Study on the Strategy of Fuel Injection Timing according to Application of Exhaust Gas Recirculation for Off-road Engine
Ha, Hyeongsoo ; Shin, Jaesik ; Pyo, Sukang ; Jung, Haksup ; Kang, Jungho ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 447~453
DOI : 10.7467/KSAE.2016.24.4.447
The reduction technologies of exhaust gas from both the off-road engine and on-road vehicles are important. It is possible to apply various combustion technologies with engines after the application of a treatment technology to this field. In this study, main injection timing, pilot injection timing, and exhaust gas recirculation (EGR) rate were selected as the experimental parameters whose effects on the emission of exhaust gases and on the fuel consumption characteristics were to be determined. In the experiment, the emission of nitrogen oxide (NOx) and Smoke, and the Torque at the same fuel consumption level, were measured. The experimental data were analyzed using the Taguchi method with an L9 orthogonal array. Additionally, analysis of variation (ANOVA) was used to confirm the influence of each parameter. Consequently, the level of each parameter was selected based on the signal-to-noise ratio data (main injection timing, 3; pilot injection timing, 3; EGR rate, 2), and the results of the Taguchi prediction were verified experimentally (error: NOx, 10.3 %; Smoke, 6.6 %; brake-specific fuel consumption (BSFC), 0.6 %).
A Study on the Characteristics of Simulated Real Driving Emissions by Using Random Driving Cycle
Kwon, Seokjoo ; Kwon, Sangil ; Kim, Hyung-Jun ; Seo, Youngho ; Park, Sungwook ; Chon, Mun Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 454~462
DOI : 10.7467/KSAE.2016.24.4.454
This study was conducted in order to estimate the exhaust emissions analysis method of the real driving emission(RDE). The Association for Emissions Control by Catalyst(AECC) has developed a test procedure by using a random cycle method based on the chassis dynamometer. In order to confirm this approach in Korea, Euro 5(DPF), Euro 6(DPF + LNT), and Euro 6(DPF + SCR) were performed on three different vehicles to determine the exhaust gas characteristics of the random cycle, real-road driving test(PEMS), and emission certification driving mode(NEDC). Six different random cycle driving modes were generated by the vehicle specifications(e.g. curb weight, engine power, gear ratio, and maximum acceleration). The NOx emissions were increased in the NEDC, random cycle, and PEMS order in this study regardless of the test vehicles. The random cycle method has the advantage because it utilizes a chassis dynamometer in the laboratories for a repeatable data collection, and it allows any eminent emission improvement checked prior to a real-road driving test with PEMS.
The Characteristics Analysis of Track of Laser Metal Deposition Using AISI M2 Powder
Kim, WonHyuck ; Song, MyungHwan ; Park, InDuck ; Kang, DaeMin ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 463~470
DOI : 10.7467/KSAE.2016.24.4.463
In this paper, the characteristics analysis of LMD track, such as including track structure, track wear resistance and track thickness, were analyzed to enhance the deposition efficiency using a diode-pumped disk laser. SKD61 hot work steel plate and Fe based AISI M2 alloy were used as a the substrate and powder for the LMD process, respectively. The laser power, track pitch and powder feed rate among LMD parameters were adopted to estimate the deposition efficiency. As the laser power is increased, heat input and melting pool on the substrate is grown also increases, so resulting in the increased LMD track thickness was increased. Through EPMA mapping analysis of the cross-section in the LMD track, it was observed that all the elements are evenly distributed inside. Therefore, the entire hardness in the LMD track is expected to be almost uniform regardless of location. The characteristics of the LMD specimen were excellent compared to the STD11 specimen in terms of the wear track width and the wear rate as well as the coefficient of friction. Especially the wear rate of LMD specimen has been significantly reduced by 60 % or more. From Based on the experimental results, the prediction formula of LMD thickness was calculated by using laser power, track pitch and powder feed rate.
An Experimental Study for Machined Patterns of Friction Surface on Disc Brake Rotor in Performance Aspect
Jung, Taeksu ; Cha, Bawoo ; Hong, Yunhwa ; Kim, Cheongmin ; Hong, Younghoon ; Cho, Chongdu ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 471~479
DOI : 10.7467/KSAE.2016.24.4.471
Cross-drilling and slotting on the frictional surface of a brake rotor are methods used for improving the performance of the brake system. These shapes have particular advantages, such as the shaving effect of a slotted shape, which maintains a clean pad-to-rotor contact surface, and the venting effect of a drilled shape, which provides passageways for the gas to escape. In order to understand the effect of the machined pattern on the brake performance aspect, an experimental method is adopted along with the dynamometer test. The cross-drilled rotor, slotted rotor, and mixed pattern rotor with cross-drilling and slotting machining are prepared and tested in terms of friction coefficient, temperature, braking torque, and noise.
A Study about Impact of Battery SOC on Fuel Economy of Conventional Diesel Vehicle
Kim, Sungwoo ; Kim, Kiho ; Ha, Jonghan ; Kwon, Seokjoo ; Seo, Youngho ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 480~486
DOI : 10.7467/KSAE.2016.24.4.480
Manufacturers have been applying several technologies that can improve the fuel economy of their cars. The regulated voltage control(RVC) system, is one of those technologies being used in passenger cars. In RVC, the voltage of an alternator is controlled depending on the electrical load demand or battery SOC, although each manufacturer differs from another in terms of detail. RVC can reduce the load of an alternator by consuming the stored energy of a battery and simultaneously generate energy. In this paper, a diesel passenger car equipped with an RVC system was tested under FTP-75 and HWFET modes to evaluate fuel economy as their initial battery SOC(100, 90, 80 and 60 %). The test results showed that the initial SOC affects fuel economy only under the FTP-75 mode. FTP-75 fuel economy of the 60% SOC was 13.2 % lower than the 100 % SOC. Also, the simultaneous consumption of the two energy sources did not appear in 60 % SOC.
Development of New-type Weight Classification System
Park, Byunghyuk ; Hwang, Jaeho ; Choi, Jaeyoung ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 4, 2016, Pages 487~494
DOI : 10.7467/KSAE.2016.24.4.487
In order to comply with the Federal Motor Vehicle Safety Standard(FMVSS) No. 208 that has been in force since September 2003, an automatic airbag suppression system has become an essential option for detecting and protecting infants and children seated in the front passenger seat of vehicles in the U.S. market. MOBIS has developed the world`s first weight-based OCS under the name NWCS. NWCS is composed of two sensors and ECU. It is sub-packaged in order to minimize the seat structure deviation. In this paper, technical features, robustness and performance of NWCS are summarized and discussed.