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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Automotive Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Automotive Engineers
Editor in Chief :
Volume & Issues
Volume 22, Issue 7 - Nov 2014
Volume 22, Issue 6 - Sep 2014
Volume 22, Issue 5 - Jul 2014
Volume 22, Issue 4 - May 2014
Volume 22, Issue 3 - Apr 2014
Volume 22, Issue 2 - Mar 2014
Volume 22, Issue 1 - Jan 2014
Selecting the target year
Quantification of Seat Comfort Feeling Long-term Comfort
Park, Hyunkyu ; Kim, Yungsik ; Lee, Jaewon ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 1~4
DOI : 10.7467/KSAE.2014.22.5.001
In recent years, requests for automotive seat comfort are increasing. An important issue of them is long-term seat comfort. Until now, the study for long-term seat comfort has been studied mainly using driver's questionnaire, changing adrenalin and electromyography. Actually the results and methodologies of them are difficult to apply to seat development and design because of money and time required. In this study, we developed Seating Feel Curve for seat comfort evaluation and a long-term seat comfort evaluation which can be applied to the development of seat comfort using seat support.
The Influence of Soft/Hard Segment Composition and Content on the Abrasion Resistance of Polyurethane Coating Agents
Son, Hyung-Suk ; Jeon, Dong-Geun ; Park, Seong-Jin ; Kim, Yong-Sung ; Kwon, Kwi-Teag ; Kim, Ki-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 5~12
DOI : 10.7467/KSAE.2014.22.5.005
Weatherstrip coatings of urethane and silicon type which are fit to EPDM and thermoplastic materials are used in sealing systems for automotive applications for noise reduction and high slip characteristics for external applications, respectively. Polyurethane binder was successfully synthesized from poly(butyladiphate)diol (PBAD), poly(tetramethylene)glycol (PTMG) and isocyanate as starting materials. Then, polyurethane coating agents were prepared by using various additives. To investigate effects of segment types on the abrasion resistance of polyurethane coating agents, thin films based on polyurethane coating materials were fabricated. With increasing the amount of hard segment in the coating agent, abrasion resistance, modulus and tensile strength of the coating films were improved, but the elongation of the coating films was decreased.
Numerical Analysis on Melting Phenomena and Phase Interface Change of Frozen Urea-aqueous Solution by Electric Heater
Woo, Seongmin ; Choi, Byungchul ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 13~19
DOI : 10.7467/KSAE.2014.22.5.013
Urea-SCR system is the selective catalytic reduction to reduce nitrogen oxides (
) emitted from diesel vehicles. The objective of this study is numerical analysis of 3-dimensional unsteady melting problems of frozen urea by using an electric heater. It can be applied to determine capacity of power with respect to time and the location of the urea suction pipe in urea storage tank. The study includes the change of liquid volume fraction, temperature profiles and a influence of natural convection by using the commercial software STAR-CCM+(v7.06). The accuracy of the numerical analysis is estimated by comparisons with experimental data. After validation, a numerical analysis for freezing urea is conducted with four different heating power. From the results, it was found that relation of velocity of phase interface and amount of melting urea by increasing heating power in a container. There is also a difference in trend between velocity of phase interface and amounts of melting urea because of effect of natural convection.
A Study on Characteristics of Durability for Plunger of High Speed and Ultra-High Pressure Reciprocating Pump Using High Velocity Oxygen Fuel Spraying
Bae, Myung-Whan ; Park, Byoung-Ho ; Jung, Hwa ; Park, Hui-Seong ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 20~28
DOI : 10.7467/KSAE.2014.22.5.020
The high velocity oxygen fuel spraying (HVOF) is a kind of surface modification process technology to form the sprayed coating layer after spraying the powder to molten or semi-molten state by the ultra-high speed at the high-temperature heat source and conflicting with a substrate. It is desirable to melt completely the thermal spray powder in order to produce the coating layer with an optimal adhesion, however, because a semi-molten powder in a spray process has the low efficiency and become a factor that degrades the mechanical property by the inducement of pore-forming within the coating layer. To improve the wear resistance, corrosion resistance and heat resistance, in this study, the plungers of high-speed and ultra-high pressure reciprocating hydraulic pumps for oil and water used in ironwork are produced with
and the coating layers of plungers are formed by the powders of WC-Co-Cr and WC-Cr-Ni including the high hardness WC. The surface of these plungers is modified by the super-mirror face grinding machine using variable air pressure developed in this laboratory, and then the characteristics of cross-sectional microstructure, and surface roughness and hardness values between no operation and 100 days-operation are examined and made a comparison. The fine tops and bottoms on surface roughness curve of oil-hydraulic pump plunger sprayed by WC-Cr-Ni are molded more and higher than those of water-hydraulic pump sprayed by WC-Co-Cr because the plunger diameter of oil-hydraulic pump is 0.4 times smaller than that of water-hydraulic pump and the pressure of oil-hydraulic pump exerted on the plunger is operated with the 70 bars higher than that of water-hydraulic pump. As a result, it is found that the values of centerline average surface roughness and maximum height for oil-hydraulic pump plunger are bigger than those of water-hydraulic pump plunger.
Thermal Characteristics of Oil-cooled In-wheel Motor in Electric Vehicles
Lim, Dong Hyun ; Kim, Sung Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 29~34
DOI : 10.7467/KSAE.2014.22.5.029
Cooling the in-wheel motor in electric vehicles is critical to its performance and durability. In this study, thermal flow analysis was conducted by evaluating the thermal performance of two conventional cooling models for in-wheel motors under the continuous rating base speed condition. For conventional model #1, in which cooling oil was stagnant in the lower end of the motor, the maximum temperature of the coil was
; for conventional model #2, in which cooling oil was circulated through the exit and entrance of the housing and jig, the maximum temperature of the coil was
. Therefore, both models proved unsuitable for in-wheel motors since the motor control specifications limited the maximum temperature to
Development of Engine ECU_ILS System for Diesel Engine of Commercial Vehicle
Ko, Youngjin ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 35~43
DOI : 10.7467/KSAE.2014.22.5.035
The automobile industry requires technological innovations to reduce fuel consumption with the public interest in environmental conservation in recent years. Thus, the hybrid system is applied not only to passenger cars but also commercial vehicles. The purpose of this paper is to develop engine ECU_ILS to develop commercial hybrid vehicles. In order to develop the engine and vehicle, the dynamometer and exhaust gas analyzer is needed. However, a lot of time and cost are required. In contrast, the model-based development environment that can be applied to a variety of test conditions can reduce development time. Therefore, a HILS system environment that can consider the behavior of actual vehicles for evaluation of the control logic, fuel consumption and exhaust gas is required. This engine ECU_ILS system was developed in this study, can analyze parameter such as the fuel injection rate, fuel injection time, fuel consumption and exhaust gas like the actual vehicle test using map data. Also, this system is expected to be able to analyze the characteristic of vehicle behavior and the development of peripheral device in relation to engine and vehicles. This HILS system can be used to develop control strategies of commercial hybrid vehicle systems in the future.
Structural Durability Analysis due to Hole Configuration Variation of Bike Disc Brake
Han, Moonsik ; Cho, Jaeung ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 44~49
DOI : 10.7467/KSAE.2014.22.5.044
As expansion and contraction of bike disk brake are happened continuously by temperature at repeated urgent braking. In this study, 3 kinds of model are designed according to configurations of holes and thermal durabilities on bike disk brake are investigated by comparing 3 models through temperature and thermal analyses. Maximum thermal stress happened at the disk contacted with pad and the connection part fixing disk rotor. Instead of initial state, the temperature is uniformly distributed at transient state. As the area of hole at disk rotor face becomes wider, thermal stress becomes lower at the initial state. On the other hand, in case the number of holes increases, thermal stress becomes lower at the elapsed time of 100 seconds. The thermal durability of bike disk brake can be improved by applying this study result with configurations of holes.
A Study on the Durability and Running Stability Evaluation of the Korean PRT
Cho, Jeonggil ; Kim, Junwoo ; Kim, Hyuntae ; Koo, Jeongseo ; Kang, Seokwon ; Jeong, Raggyo ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 50~58
DOI : 10.7467/KSAE.2014.22.5.050
The PRT(Personal Rapid Transit) system is highly interested to meet a need for demand-responsive transport service and increasing demands of traffic in Korea recently. And it is being spotlighted as an eco-friendly transportation system. For these reasons, researches on the PRT system are actively undergoing in Korea. In this study, we evaluated the static structural and fatigue strengths based on ASCE-APM standards and ERRI B 12/RP 17 by means of FE simulation. We also evaluate the running stability by multi-body dynamic analyses and the rollover safety by a theoretical static stability factor according to the road modeling scenarios for the PRT system. From the results of this study, we confirmed the durability and running stability of the Korean PRT under development.
A Study on Biodiesel Fuel of Engine Performance and Emission Characteristics in Diesel Engine
Chen, Lei ; Cheng, Yukun ; Kim, Jaeduk ; Song, Kyukeun ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 59~65
DOI : 10.7467/KSAE.2014.22.5.059
Diesel engines have the superior combustion efficiency and fuel economy that they are widely used for industry, heavyduty vehicles, etc. However, its exhaust emissions have become the major concerns due to their environmental impacts. Moreover, the depletion of fossil fuels is the main issue. Therefore, it is important to look for alternative sources of energy. Bio-diesel is one of the ideal energy which has proved to be ecofriendly for more than fossil fuels. The experimental tests analysed the engine performance and emission characteristics of a diesel engine using diesel and biodiesel blended of BD25, BD45 and BD65, in order to study the use of clean fuel to meet the increasingly stringent emission regulations. The engine performance was examined by using engine dynamometer while an exhaust gas analyzer was used to examine the emission characteristics. The effect of biodiesel on engine performance were lower to diesel through comparing their HP and torque but fuel consumption was slightly increased because of biodiesel has lower heating value and higher density than diesel. However, due to the better lubricity, the brake thermal efficiency of biodiesel was higher than diesel. The emission characteristics were strongly affected by the blending ratio of diesel and biodiesel. The results showed that the smoke opacity, hydrocarbons (HC) and carbon monoxide (CO) emissions decreased while the nitrogen oxides (NOX) slightly increased.
Design Optimization of Over-slam Bumper for Moving Part Over-travel
Choi, Yeonwook ; Ki, Wonyong ; Lee, Jonghyun ; Heo, Seung-Jin ; Rhie, Chulhong ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 66~72
DOI : 10.7467/KSAE.2014.22.5.066
A kinematic analysis method has been used as analysis method for dynamic behavior of moving parts of vehicle, especially hood part. Such analysis method, however, has its limitations in terms of design technology, including, over travel of hood that occurs due to lack of considerations of compliance characteristics, such as flexible components of hood's weather strip and over slam bumper. Therefore, it is necessary to develop a modeling which reflects compliance of flexible components of hood and elastic characteristics of panel for improvement of design process. In this thesis, a finite element method as mentioned earlier, is developed to represent over travel of hood. Also optimization process applying sequential approximate optimization is suggested to prevent over travel. The over travel analysis method and optimization process, which are developed through the research, would make it possible to design with high quality and credibility. Furthermore, it is expected that the time for design would be reduced and the design quality also improved.
CFD Analysis on Gas Injection System of Solid SCR for NOx Reduction of Exhaust Emissions in Diesel Engine
Lee, Hoyeol ; Yoon, Cheon Seog ; Kim, Hongsuk ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 73~83
DOI : 10.7467/KSAE.2014.22.5.073
CFD(computational fluid dynamics) model is developed to simulate direct injection of ammonia gas phase from ammonia transporting materials into the SCR catalyst in the exhaust pipe of the engine with solid SCR. Configurations of one-hole and four-hole nozzle, circumferential type, porous tube type, and the effect of mixer configurations which commonly used in liquid injection of AdBlue are considered for complex geometries. Mal-distribution index related to concentration of ammonia gas, flow uniformity index related to velocity distribution, and pressure drop related to flow resistance are compared for different configurations of complex geometries at the front section of SCR catalyst. These results are used to design the injection system of ammonia gas phase for solid SCR of target vehicle.
Study of Pre-ventilation Effects on the Cabin Thermal Load
Lee, Daewoong ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 84~90
DOI : 10.7467/KSAE.2014.22.5.084
The aim of this paper is to investigate the application of solar energy in reducing cabin thermal load. When a vehicle is parked under the sun in summer, the interior temperature can reach up to
depending on the solar intensity. Solar power, one of the green energies, is used in automobile air conditioning systems, in order to operate the blower. The power supply of a blower's voltage has been used in a solar sunroof experiment. At the climate wind tunnel, cabin temperature changes were conducted with various operating modes of an air handling system and the preventilation parking conditions of several vehicles, outdoors, was also examined. The test results of the solar sunroof, 39.3W power and 14.1% efficiency were obtained. The thermal load behavior was analysed with the air handling system operating mode differently according to the cabin temperature. By simply operating the blower, average cabin temperature decreased between
in those vehicles parked outdoors in summer. This reveals that cabin thermal comfort can be improved without consuming the vehicle's extra energy, and that the performance of the air-conditioning system is better than those currently found in vehicles. Moreover, fuel economy will be increased as a result of the reduction in the use of the air-conditioning system, and many other human advantages will be gained. Such advantages include minimized VOCs and a healthy cabin environment.
Timing Verification of AUTOSAR-compliant Diesel Engine Management System Using Measurement-based Worst-case Execution Time Analysis
Park, Inseok ; Kang, Eunhwan ; Chung, Jaesung ; Sohn, Jeongwon ; Sunwoo, Myoungho ; Lee, Kangseok ; Lee, Wootaik ; Youn, Jeamyoung ; Won, Donghoon ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 91~101
DOI : 10.7467/KSAE.2014.22.5.091
In this study, we presented a timing verification method for a passenger car diesel engine management system (EMS) using measurement-based worst-case execution time (WCET) analysis. In order to cope with AUTOSAR-compliant software architecture, a development process model is proposed. In the process model, a runnable is regarded as a test unit and its temporal behavior (i.e. maximum observed execution time, MOET) is obtained along with on-target functionality evaluation results during online unit test. Furthermore, a cost-effective framework for online unit test is proposed. Because the runtime environment layer and the standard calibration environment are utilized to implement test interface, additional resource consumption of the target processor is minimized. Using the proposed development process model and unit test framework, the MOETs of 86 runnables for diesel EMS are obtained with 213 unit test cases. Using the obtained MOETs of runnables, the WCETs of tasks are estimated and the schedulability is evaluated. From the schedulability analysis results, the problems of the initially designed schedule table is recognized and it is fixed by redesigning of the runnable mapping and task offset. Through the various test scenarios, the proposed method is validated.
Analysis of Fuel Economy for Series Plug-in Hybrid Electric Bus according to Engine Operation Strategy Based on Simulation
Kim, Jinseong ; Lee, Chibum ; Park, Yeong-Il ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 102~107
DOI : 10.7467/KSAE.2014.22.5.102
Because of high oil prices and emission gas problems, many governments tighten regulation of fuel economy and emission gas. For Passenger car, there are many researches for plug-in hybrid electric vehicles and they are being manufactured. On the other hand, there are few researches for plug-in hybrid electric bus that is heavy commercial vehicle. In this study, analysis of fuel economy for series plug-in hybrid electric bus according to engine operation strategy based on simulation is conducted. Forward simulator is developed using Autonomie. Engine operation strategies consist on constant engine operation strategy and engine on/off operation strategy. Considering the engine operation strategy, results of vehicle speed, engine operating points and fuel economy are obtained and analyzed. As a result, engine on/off operation strategy has more advantage than constant engine operation strategy in terms of fuel economy.
Analysis on Combustion Characteristics of CRDi Single-cylinder Diesel Engine with Direct Needle-driven Piezo Injector
Chung, Myungchul ; Sung, Gisu ; Kim, Sangmyung ; Lee, Jinwook ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 108~115
DOI : 10.7467/KSAE.2014.22.5.108
In this study, experimental approaching method was applied under and single-cylinder engine to research the performance of direct needle-driven piezo injector (DPI) for CR direct-injection. As key-point factor of this DPI that relies on direct-acting operating of injector needle, unlike conventional hydraulic-servo, its nozzle needle can be directly driven by piezo actuator. Thus, effect of direct-acting injection of DPI on diesel combustion and emission characteristics was investigated under common-rail single-cylinder direct-injection engine, equipped with three different driving mechanism, including indirect-acting solenoid, piezo and DPI system. As main results, it found that a direct-acting piezo injector has higher of IMEP. And it has higher heat release rate during premixed combustion and mixing controlled combustion phase due to its higher heat release, even though nitrogen oxide (NOx) formations were increased slightly.
A Feasibility Study of Using Diesel/Biodiesel-Pyrolysis Oil-Butanol Blends in a Diesel Engine
Kim, Hoseung ; Jang, Youngun ; Lee, Seokhwan ; Kim, Taeyoung ; Kang, Kernyong ; Yoon, Junkyu ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 116~125
DOI : 10.7467/KSAE.2014.22.5.116
Pyrolysis oil (PO), derived from biomass through fast pyrolysis process have the potential to displace significant amounts of petroleum fuels. The PO derived from wood has been regarded as an alternative fuel to be used in diesel engines. However, the use of PO in a diesel engine is very limited due to its poor properties like low energy density, low cetane number, high acidity and high viscosity of PO. Therefore, one of the easiest way to adopt PO to diesel engine without modifications is blended with other fuels that have high centane number. However, PO that has high amount of polar chemicals is immiscible with non polar hydrocarbons of diesel or biodiesel. Thus, to stabilize a homogeneous phase of diesel/biodiesel-PO blends, a proper surfactant should be used. Nevertheless, PO which was produced from different biomass type have varied characteristics and this complicates the selection of a suitable additive for a specific PO-diesel emulsion. In this regard, a more simple approach such as the use of a co-solvent like ethanol or butanol to induce a more stable phase of the PO-diesel mixture could be a promising alternative. In this study, a diesel engine operated with diesel/biodiesel-PO-butanol blends was experimentally investigated. Performance and gaseous & particle emission characteristics of a diesel engine were examined under the engine loads of IMEP 0.2 ~ 0.8MPa.
Development of Control Algorithm for Intersection Safety System Using the Fusion of V2X and Environmental Sensors
Park, Manbok ; Lee, Sanghyun ; Jun, Sibum ; Kee, Seokcheol ; Kim, Jungbeom ; Kee, Changdon ; Kim, Kyuwon ; Yi, Kyongsu ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 5, 2014, Pages 126~135
DOI : 10.7467/KSAE.2014.22.5.126
This paper describes the development and verification of control algorithms for V2X and environmental sensor integrated intersection support and safety systems. The objective of the research is to develop core technologies for effective fusion of V2X and environmental sensors and to develop new safety function for intersection safety. One of core technologies is to achieve the improvement of GPS accuracy, and the other is to develop the algorithm of a vehicle identification which matches all data from V2X, vehicle sensors and environmental sensors to specific vehicles. A intersection optimal pass (IOP) algorithm is designed based on these core technologies. IOP recommends appropriate speed to pass the intersection in the consideration of traffic light signal and preceeding vehicle existence. Another function is developed to prevent a collision avoidance when car crash caused by traffic violation of surrounding vehicles is expected. Finally all functions are implemented and tested in three test vehicles. It is shown that IOP can support convenient and comfortable driving with recommending optimal pass speed and collision avoidance algorithm can effectively prevent collision caused by traffic sign violation of surrounding vehicles.