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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 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
Selecting the target year
Development of BLDC Motor for HEV Engine Cooling and Battery Cooling System
Lee, Daewoong ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 153~160
DOI : 10.7467/KSAE.2015.23.2.153
Hybrid Electric Vehicles(HEVs) have seriously come into prevalence recently as car manufacturers and consumers have become more aware of the environmental and economic problems of conventional vehicles. For the alternative power-train and battery cooling systems in HEVs, an effective thermal management system is required, and many automakers are interested in using Brushless DC(BLDC) motors for cooling fans for the overall traction unit's performance and energy saving capability. This paper presents the development status of BLDC motors as major parts of the power-train, i.e. the engine cooling and battery cooling fans of HEVs. A design that uses BLDC motors for the power-train and each battery cooling fan, is successfully implemented through using electro-magnetic analysis, and prototype BLDC motors are examined. As experimental results, the BLDC motors achieved an efficiency of 85% as engine cooling fans and 72% as a battery thermal management fan motor. The electric cogging noise is significantly reduced by changing the skew of the slot pitch angle and optimizing the magnetic shape.
Development of Urban Driving Cycle for Performance Evaluation of Electric Vehicles Part II: Verification of Driving Cycle
Jeong, Nak-Tak ; Yang, Seong-Mo ; Kim, Kwang-Seup ; Choi, Su-Bin ; Wang, Maosen ; You, Sehoon ; Kim, Hyunsoo ; Suh, Myung-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 161~168
DOI : 10.7467/KSAE.2015.23.2.161
Recently, due to various environmental problems such as global warming, increases of international oil prices, exhaustion of resource, a paradigm of world automobile market is rapidly changing from conventional vehicles using internal combustion engine to eco-friendly vehicles using electric power such as EV, HEV, PHEV and FCEV. Generally, in order to measure fuel consumption and pollutant emissions of cars, chassis dynamometer tests are performed on various driving cycles before actual driving test. There are many driving cycles for performance evaluation of conventional vehicles. However, there is a lack of researches on driving cycle for EV. In this study, the urban driving cycle for performance evaluation of electric vehicles was developed. This study is composed of two parts. In the part 1, the urban driving cycle 'GUDC-EV(Gwacheon-city Urban Driving Cycle for Electric Vehicles)' was developed by using driving data, which were obtained through actual driving experiment, and statistic analysis with chronological table. In this paper part 2, in order to verify the developed driving cycle GUDC-EV, virtual EV platforms were configured and simulations were performed with actual driving data using In addition, simulation results were compared with existing driving cycles such as FTP-72, NEDC and Japan 10-15.
Comparison of the LNT Regeneration Methods in 2.2L Common Rail Direct Injection Diesel Engine
Nam, Chungwoo ; Han, Manbae ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 169~177
DOI : 10.7467/KSAE.2015.23.2.169
In this study we investigated the regeneration methods for the lean
trap (LNT) catalyst in a 2.2L direct injection diesel engine. The regeneration methods were 1) in-cylinder post fuel injection and 2) external fuel injection strategy. The in-cylinder post fuel injection method uses in-cylinder injectors with the addition of the post fuel injection to supply enough reductants such as CO,
, THC. The external fuel injection method was enabled by installing a fuel injector with a wide spray angle before the LNT catalyst. Through the engine experiment, the
conversion efficiency, the amount of reductant exhaust gases, fuel consumption, and temperature behavior in the LNT catalyst were evaluated and compared for the two regeneration methods.
A Study of Low Temperature Combustion System Optimization for Heavy Duty Diesel Engine
Han, Youngdeok ; Shim, Euijoon ; Shin, Seunghyup ; Kim, Duksang ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 178~184
DOI : 10.7467/KSAE.2015.23.2.178
According to the regulation on the environment and fuel efficiency is becoming strict, many experiments are conducted to improve efficiency and emission in internal combustion engines. LTC (Low temperature combustion) technology is a promised solution for low emissions but there are a few barriers for the commercial engine. This paper includes optimization that applies LTC method to heavy duty diesel engine. Adequate LTC was applied to low and middle load as adaptability in heavy duty diesel engine, and optimization focused on reduction of fuel consumption was proceeded at high load. Through this research, strategy for practical use of LTC was selected, and fuel consumption has improved on the condition that satisfies the emission regulation at systematic viewpoint.
Development of Seat Belt Pulling Noise Index and Evaluation System Research
Cho, Hye-Young ; Lee, Sang-Kwon ; Kang, Hee-Su ; Son, Joo-Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 185~190
DOI : 10.7467/KSAE.2015.23.2.185
The purpose of this study is developing the quantify the seat belt pulling Noise index and evaluation method. This paper presents the objective method to evaluate the emotional feeling about the pulling Noise of the seat belt. The physical quantification is required to objectively evaluate the emotional feeling of the pulling Noise. This is called the "Noise metric." The Noise metric is should correlated to the subjective rating of the pulling Noise. The pulling Noise index is developed throughout the linear regression of the Noise metric and the subjective rating. The developed index is used for the objective evaluation of the emotional feeling about the pulling Noise of a seat belt throughout the modification of seat belt components.
Numerical Study on the Flow Characteristics according to the Ventilation Holes Shape of the Carbon Composite Brake Disk
Ko, Dongguk ; Yoon, Suckju ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 191~198
DOI : 10.7467/KSAE.2015.23.2.191
In this study, the flow characteristics at the ventilation holes was analyzed by using numerical method when carbon composite brake disk was rotated at a constant speed. In order to ensure the validity of the analysis results, grid dependency test was performed by considering the accuracy and appropriateness, and 4mm mesh size was selected for decrease of the maximum error rate 63.6%. As a result, the outside air flows in the clearance between the disk and shaft in case of B model. whereas, the outside air flows in the clearance or the outlet of the ventilation holes in case of A and C models. And also average static pressure at the outlet was changed depending on shape of the ventilation holes and rotational speed of the disk in case of A and C models. Besides, in the B model, intake air according to the clearance goes with side surface of ventilation hole, and so increased by mean velocity of 4.64m/s and mean pressure of 0.58pa in the ventilation hole outlet, in case of disk rotational speed of 146.21rad/s.
A Study on Synthetic Method and Material Analysis of Calcium Ammine Chloride as Ammonia Transport Materials for Solid SCR
Shin, Jong Kook ; Yoon, Cheon Seog ; Kim, Hongsuk ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 199~207
DOI : 10.7467/KSAE.2015.23.2.199
Solid materials of ammonia sources with SCR have been considered for the application of lean NOx reduction in automobile industry, to overcome complex problems of liquid urea based SCR. These solid materials produce ammonia gas directly with proper heating and can be packaged by compact size, because of high volumetric ammonia density. Among ammonium salts and metal ammine chlorides, calcium ammine chloride was focused on this paper due to low decomposition temperature. In order to make calcium ammine chloride in lab-scale, simple reactor and glove box was designed and built with ammonium gas tank, regulator, and sensors. Basic test conditions of charging ammonia gas to anhydrous calcium chloride are chosen from equilibrium vapor pressure by Van't Hoff plot based on thermodynamic properties of materials. Synthetic method of calcium ammine chloride were studied for different durations, temperatures, and pressures with proper ammonia gas charged, as a respect of ammonia gas adsorption rate(%) from simple weight calculations which were confirmed by IC. Also, lab-made calcium ammine chloride were analyzed by TGA and DSC to clarify decomposition step in the equations of chemical reaction. To understand material characteristics for lab-made calcium ammine chloride, DA, XRD and FT-IR analysis were performed with published data of literature. From analytical results, water content in lab-made calcium ammine chloride can be discovered and new test procedures of water removal were proposed.
Durability Analysis on Fatigue of Caliper Cylinder
Han, Moonsik ; Cho, Jaeung ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 208~213
DOI : 10.7467/KSAE.2015.23.2.208
In this study, two models due to the configuration of caliper cylinder among the parts of automotive brake system are studied by structural and fatigue analysis. As the maximum equivalent stress at model 2 becomes 1.5 times lower than model 1, model 2 can endure load higher than model 1. In case of fatigue damage analysis on model 1 and 2, model 1 has the damage area more than model 2. Fatigue damage at model 1 happen more than model 2. These study results can be effectively utilized with the design on caliper cylinder by anticipating prevention against its damage and investigating durability.
Characteristics of Bio-diesel according to Irradiation for Ultrasonic Energy
Park, Chungyeol ; Choi, Dooseuk ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 214~220
DOI : 10.7467/KSAE.2015.23.2.214
Since resources of fossil fuels are limited, development of alternative energies is emphasized and research on new-regenerative energy is actively in progress worldwide. In present research, physical and chemical characteristics of mixed fuel are analyzed in detail for the different mixture rate of conventional and bio-diesel and ultrasonic irradiation time. Experimental setup consists of ultrasonic generator, vibrator, horn, and reflector. Various physical and chemical characteristics of fuel are investigated for volumetric mixture rate of bio-diesel from 0 to 100%. As results, viscosity and surface tension is increased as mixture rate of bio-diesel is increased. Also, molecular splits and reunions are increased and decreased repeatedly after some period of time as ultrasonic energy irradiation time is increased. As conclusion of experiments, Olefin rate, Branch index, and Aromatic rate are influenced by ultrasonic irradiation time.
Characteristics of the In-cylinder Flow and Fuel Behavior with Respect to Fuel Injection Angle and Cone Angle in the PFI Dual Injection Engine
Lee, Seung Yeob ; Chung, Jin Taek ; Park, Young Joon ; Yu, Chul Ho ; Kim, Woo Tae ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 221~229
DOI : 10.7467/KSAE.2015.23.2.221
The PFI dual injection engine using one injector per an intake port was developed for solving the DISI engine cost problem. Excellent fuel atomization and targeting of the PFI dual injection engine made enhancement on the fuel efficiency and engine power. In order to develop a PFI dual injection engine, characteristics of the in-cylinder flow and fuel behavior with respect to fuel injection angle and cone angle of the PFI dual injection engine was investigated. Numerical calculation was conducted to analyze 3D unsteady in-cylinder flow and fuel behavior using STAR-CD. The engine operating condition was 2,000rpm at WOT. As a result, the amount of intake air, evaporated fuel and fuel film according to injection angle and cone angle were presented. The results were influenced by interaction between injected fuel and intake port wall.
Study on the Strategy of CO
Reduction Technology in Vehicle according to CO
Emissions Regulation in EU - Focusing on Auxiliary Energy Improvement -
Seok, Kyu-Up ; Yoon, Hyoung Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 230~238
DOI : 10.7467/KSAE.2015.23.2.230
The main purpose of this paper is to suggest opportunities for reducing
emission in energy conversion of a vehicle, focused on auxiliary energy improvement in the automotive field. As part of worldwide efforts to curb global warming and to protect the domestic industry as trade barriers, many countries have set goals to regulate greenhouse gas emissions. As an example, new
emission regulation in EU was expected to go into effect strictly in 2020. Therefore, global car-makers need to establish strategic responsiveness of the regulations. This paper shows
economic value by using the correct interpretation of the relevant laws and regulations. The
value analyzed using quantitative figures leads to the possibility of auxiliary(accessories, HVAC, electric apparatus etc.) technology for improving fuel economy. As a result, this study generalizes the meaning of electric power saving for each driving mode by auxiliary energy improvement.
Analysis of Work Load for Developing the Control Strategy of Hybrid Agricultural Tractor
Kim, Jinseong ; Park, Yeongil ;
Transactions of the Korean Society of Automotive Engineers, volume 23, issue 2, 2015, Pages 239~245
DOI : 10.7467/KSAE.2015.23.2.239
In order to control the hybrid power system efficiently, the knowledge for the required load of the system is important. The agricultural tractor performs various farm works such as plow, rotary, and baler. When it performs rotary tillage and baler operation, the generated work load is analyzed. To analyze trend of work load, moving average technique is applied to the measurement data. Optimal control inputs for the two works are obtained from simulation using the dynamic programming. The novel fundamental control strategy for parallel hybrid tractor called Max. SOC is proposed.