Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 20, Issue 6 - Nov 2012
Volume 20, Issue 5 - Sep 2012
Volume 20, Issue 4 - Jul 2012
Volume 20, Issue 3 - May 2012
Volume 20, Issue 2 - Mar 2012
Volume 20, Issue 1 - Jan 2012
Selecting the target year
Improvement of Passenger Airbag Based on the Injury Assessment of the 5th Percentile Female Dummy
Kwon, Yul ; Kim, Kwon-Hee ; Son, Chang-Kyu ; Kim, Hyung-Il ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 1~7
DOI : 10.7467/KSAE.2012.20.5.001
Automobile airbag deployment process has been studied with MADYMO software. Based on the FMVSS208 and USNCAP(United States New Car Assessment Program) regulations, four parameters were chosen for the design improvement with reference to the 5th percentile female passenger dummy: time to fire, vent hole size, tether length and tank test pressure of inflator. Sensitivity analyses based on orthogonal arrays show that enhanced protection of small females can be achieved with improved USNCAP rating within the boundary of FMVSS 208.
Welding Properties of 1000MPa Class High Strength Steel Sheets for Car Body Using Disk Laser
Seol, Hyun-Uk ; Song, Mun-Jong ; Lee, Kyu-Hyun ; Lee, Mun-Yong ; Kim, Sok-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 8~12
DOI : 10.7467/KSAE.2012.20.5.008
Application for laser welding have increased steadily in recent years due to its benefits such as high speed, high productivity and high density energy heat source. In this study, the influence of welding parameters was investigated on penetration characteristics, mechanical properties including formability test in disk laser welded 1000MPa class steels. A shielding gas was used and bead-on-plate test was performed with various welding speeds. The main welding test was performed by butt welding with various welding speeds at 2.5 kW laser power.
Research of Natural Gas/Diesel Dual Fuel Vehicle
Lee, Sang-Min ; Lim, Ock-Taeck ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 13~18
DOI : 10.7467/KSAE.2012.20.5.013
This research is about the exhaust gas and driving performance test which are for CNG-Diesel dual fuel engine. The CNG-Diesel dual fuel engine converted from 2500cc diesel has two steps of injection systems; small amount of diesel is injected to mixture CNG in cylinder to ignite before CNG is injected into each intake manifold to form mixture. The amounts of output power and emission in duel fuel consumption were measured by engine dynamometer and exhaust gas analyzer. Over 90% of diesel consumption reduction, similar driving performance to current diesel engine and reduced emission on
and PM, respectively, were indicated through the measurements. The two steps of system were applied to vehicle to investigate exhaust gas characteristics and driving performance via NEDC mode and real driving test. Additional oxidation catalyst was applied to reduce emission on the test vehicle and the NEDC mode test showed the reduction of Co,
, Pm and THC.
Effects of DME Additives on Combustion Characteristics and Nano-particle Distributions in a Single Cylinder Compression Ignition Engine
Kwon, Seok-Joo ; Cha, June-Pyo ; Kang, Min-Gu ; Lee, Chang-Sik ; Park, Sung-Wook ; Lim, Young-Kwan ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 19~25
DOI : 10.7467/KSAE.2012.20.5.019
This study describes effects of DME additives on combustion and exhaust emissions characteristics including nano-particle in a single cylinder compression ignition engine. Considered additives include bio-diesel, n-butanol, and MTBE for increasing kinematic viscosity. Among three additives, n-butanol showed the greatest kinematic viscosity. In addition MTBE showed the highest vapor pressure. In the present study mixing ratios of additives were kept constant at 1 and 10% by volume. Experiments were performed at 1200rpm engine speed and nano-particles were measured by SMPS (Scanning mobility particle sizer) devices. Results of combustion characteristics showed that considered additives had little effects on combustion pressure. However, patterns of heat release rate were dependent on properties of additives. Nano-particles of MTBE were the lowest among considered additives.
Study on the Influence of Wheel Arches, Wheels, and Side Mirrors on Aerodynamic Performance of a Fast Cruising Passenger Car
Song, Ki-Sun ; Kang, Seung-On ; Park, Hoon-Il ; Kee, Jung-Do ; Kim, Kyu-Hong ; Lee, Dong-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 26~35
DOI : 10.7467/KSAE.2012.20.5.026
This paper investigates the influence on the aerodynamic performance of a passenger cruising very fast by some specific car body parts such as side mirrors, wheel arches and wheels designed hardly regarding aerodynamics. The magnitude of the contribution of each part is analyzed via on the CFD simulations. YF SONATA, a sedan of Hyundai Motors Company, plays a major role as the baseline car in this research, representing all passenger car. The CFD analysis condition consists of 6 different cases depending on whether each part exists or not. According to the CFD results, there were confirmed that additionally to the body parts' own drag, the car body went through somewhat the consequential increment of the drag by them. Among the 3 parts, wheel is the magnate that not only has the maximal drag but drives the drag of the passenger car to increase most steeply and the next is the side mirror.
Numerical Study on the Flow Characteristics with a Vane-type Static Mixer in the Diesel Exhaust Systems
Kang, Kyoung-Nam ; Kim, Man-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 36~43
DOI : 10.7467/KSAE.2012.20.5.036
In this work the mixing and flow characteristics of a vane-type static mixer were investigated numerically for the reduction of NOx in the SCR-system of the diesel engines. The mixer was located in the 57 times pipe diameter away from the inlet. The analysis were performed by changing such various parameters as vane shape, angles, blockage ratio and location of the vane. The flow structure through the mixer was characterized by uniformity index and pressure drop. The results show that uniformity index and pressure coefficient are substantially influenced by the vane shape, angle, blockage ratio and position of the vane of the mixer.
Design Optimization of Intake Muffler for Fuel Cell Electric Vehicle APU
Kim, Eui-Youl ; Lee, Young-Joon ; Lee, Sang-Kwon ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 44~52
DOI : 10.7467/KSAE.2012.20.5.044
Fuel cell electric vehicles have some noise problems due to its air processing unit which is required to feed the ambient air into the fuel cell stack. Discrete-frequency noises are radiated from a centrifugal blower due to rotor-stator interaction. Their fundamental frequency is the blade passing frequency, which is determined by the number of rotor blades and their rotating speed. To reduce such noises, multi-chamber perforated muffler has been designed. In this paper, in order to improve the transmission loss of a perforated muffler, the relationship between the impedance model of a perforated hole and its noise reduction performance is studied, and the applicability of a short-length perforated muffler to air processing unit of fuel cell system is described using acoustic simulation results and experimental data. The acoustic velocity vector across the neck of a perforated hole is very important design factor to optimize the transmission of an intake muffler. The suggested short-length perforated muffler is effective on discrete-frequency noises while keeping the volume of intake muffler minimized.
Evaluation of Fatigue Behavior for Laser Welded High Strength Steel Sheets (SPFC590)
Heo, Cheol ; Kwon, Jong-Wan ; Cho, Hyun-Deog ; Choi, Sung-Jong ; Chung, Woo-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 53~64
DOI : 10.7467/KSAE.2012.20.5.053
Deep and narrow welds can be produced by laser welding at high welding speeds with a narrow heat-affected zone (HAZ) and little distortion of the workpiece. This study aims to evaluate the usefulness of laser welding at automobile component manufacture. Microstructure observation, hardness test, tensile test and fatigue life test are performed by using the fiber laser welded SPFC590 steel sheets which is used widely in the manufacture of automotive seat frame. Three kinds of specimens are only a SPFC590 steel plate, quasi-butt joint plate and lap joint plate by laser welding. The following results that will be helpful to understand the static strength, fatigue crack initiation and growth mechanism were obtained. (1) The tensile strength of quasi butt joint specimens nearly equal to base metal specimens, but lap joint specimens fractured in shear area of weld metal. (2) The fatigue strength of quasi-butt joint specimen was approximately 8 percent lower than that of the base metal specimens. Furthermore, the lap joint specimens were less than 86 percent of the base metal specimens. (3) The lap joint fatigue specimens fractured at shear area in high level stress amplitude, while fractured at normal area in low level stress amplitude. From these results, the applicability of the laser welding to the automobile component is discussed.
A Study on Measuring Clutch Dynamic Torque
Lee, Sung-Koo ; Kim, Dong-Young ; Hur, Man-Dae ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 65~70
DOI : 10.7467/KSAE.2012.20.5.065
Torque fluctuation of engine generate gear rattle noise of transmission and many researches have been studied to decrease rattle noise by adjusting clutch damper system. So design optimization of clutch system is very important to decrease rattle noise and need knowing clutch dynamic torque at real vehicle driving condition. This makes it possible to measure clutch dynamic torque by using a small-size magnetic sensor. We install a small-size magnetic sensor on the input shaft of the transmission and measure the relative angular displacement between clutch hub and disc plate. We can obtain the clutch torque correspond to the angular displacement in the clutch torsional characteristics test. The object of this research is to measure clutch dynamic torque on real vehicle condition. Therefore, Clutch dynamic torque is very useful for investigating operating range of clutch according to engine torque and predicting the damping performance of torsional vibration on the powertrain.
An Experimental and Modeling Study on the Oxidation Kinetics of Nitric Oxide over Platinum-based Catalysts
Kim, Young-Deuk ; Jeong, Soo-Jin ; Kim, Woo-Seung ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 71~80
DOI : 10.7467/KSAE.2012.20.5.071
To improve the
conversion over a SCR (selective catalytic reduction) catalyst, the DOC (diesel oxidation catalyst) is usually placed upstream of the SCR catalyst to enhance the fast SCR reaction (
) using equimolar amounts of NO and
. Here, a ratio of
above 50% should be avoided, because the reaction with
) is slower than the standard SCR reaction (
). In order to accurately predict the performance characteristics of SCR catalysts, it is therefore desired to develop a more simple and reliable mathematical and kinetic models on the oxidation kinetics of nitric oxide over a DOC. In the present work, the prediction accuracy and limit of three different chemical reaction kinetics models are presented to describe the chemicophysical characteristics and conversion performance of DOCs. Steady-state experiments with DOCs mounted on a light-duty four-cylinder 2.0-L turbocharged diesel engine then are performed, using an engine-dynamometer system to calibrate the kinetic parameters such as activation energies and preexponential factors of heterogeneous reactions. The reaction kinetics for NO oxidation over Pt-based catalysts is determined in conjunction with a transient one-dimensional (1D) heterogeneous plug flow reactor (PFR) model with diesel exhaust gas temperatures in the range of 115~
and space velocities in the range of
Statistical Review for USNCAP Front Crash Test Results in MY2011
Beom, Hyen-Kyun ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 81~87
DOI : 10.7467/KSAE.2012.20.5.081
New car assessment program (NCAP) originated from USNCAP in 1979 has been implemented in several countries or markets, for instance USA, Europe, Korea, Japan, China and Australia. NCAP has contributed greatly to reduce accidental tolls. But recently, NCAP performance has no distinction between cars because manufacturer have been continuously developed to improve NCAP performance. Therefore, NHTSA announced new USNCAP protocol becoming effective from MY2011. NHTSA had carried out many NCAP tests based on the new test protocol and announced these test results. In this paper, USNCAP test results were reviewed by statistical method. This review was focused on passenger cars and frontal crash test results in order to investigate effect of changes in new NCAP protocol. There are two key changes, one is sited female dummy in passenger position, the other is enlarged to 4 scoring body regions in each dummy. Results of this review were summarized as followings. Performance in Passenger (12.5%) is lower than Driver's (50%) for number of 5 star vehicle. Neck injury criterion is dominant to NCAP star rating for both dummies in the mean sense. For standard deviation, chest deflection is showed largest value in driver dummy but neck injury criterion is showed for passenger's. DKAB and PKAB were equipped 28.1% and 6.2%, respectively. Consequently, the countermeasure for new USNCAP frontal crash test is essential to control well dummy kinematics with some safety features including KAB to reduce neck injuries.
Analysis of Down Speeding Effect on Fuel Economy during NEDC
Shim, Beom-Joo ; Park, Kyoung-Suk ; Park, Jun-Su ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 88~94
DOI : 10.7467/KSAE.2012.20.5.088
Development trend of modern HSDI diesel engine is now focusing on low fuel consumption and emission because of strong interest in global environmental protection. Two big branches of criteria for modern diesel engine development are down sizing and down speeding. Down sizing keeps engine operation condition to the direction of higher load and thus pursuing for better thermal efficiency. But this may cause degraded vehicle dynamic performance because of reduced back up torque. Down speeding keeps engine operation condition to the direction of slightly higher load and lower engine speed. Therefore reduction of back up torque can be limited within flat torque area. This study analyzed fuel economy effect of down speeding on a vehicle powered by HSDI diesel engine in aspect of engine friction work, intake and exhaust pumping work, exhaust hat loss and thermal loss of fuel leakage of fuel injection system. Contribution factor of each engine and vehicle related parameters under basic and down speeding condition were compared and work balance of down speeding during NEDC was analyzed.
A Study on Thermo-flow Characteristics Analysis of Electric Water Pump
Kim, Sung-Chul ; Song, Hyeong-Geun ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 95~101
DOI : 10.7467/KSAE.2012.20.5.095
An electric water pump for engine cooling system has an advantage which particularly in the cold start, the use of the electric water pump saves fuel and leads to a corresponding reduction in emissions. The canned type electric water pump without mechanical sealing elements was selected to meet the requirements for operational reliability and life. However, the electric water pump for internal combustion engine generates much more heat loss than for hybrid electric vehicle since it is operated by the electric power of high current and low voltage. In this study, the fluid flow and thermal characteristics of the canned type electric water pump as an inverter integrated water pump has been investigated under the effects of heat generation. The analysis conditions such as outdoor air temperature of
, water pump speed of 6000 rpm, coolant temperature of
and coolant flow rate of 120 L/min was used as a standard condition. Therefore, flow fields and temperature distribution inside the water pump were obtained. Also, we checked the feasibility of the canned type for the electric water pump in comparison with the mechanical seal type.
Performance and Emission Characteristics of a Diesel Engine Operated with Wood Pyrolysis Oil
Lee, Seok-Hwan ; Park, Jun-Hyuk ; Choi, Young ; Woo, Se-Jong ; Kang, Kern-Yong ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 102~112
DOI : 10.7467/KSAE.2012.20.5.102
The vast stores of biomass available in the worldwide have the potential to displace significant amounts of fuels that are currently derived from petroleum sources. Fast pyrolysis of biomass is one of possible paths by which we can convert biomass to higher value products. The wood pyrolysis oil (WPO), also known as the bio crude oil (BCO), have been regarded as an alternative fuel for petroleum fuels to be used in diesel engine. However, the use of BCO in a diesel engine requires modifications due to low energy density, high water contents, low acidity, and high viscosity of the BCO. One of the easiest way to adopt BCO to diesel engine without modifications is emulsification of BCO with diesel and bio diesel. In this study, a diesel engine operated with diesel, bio diesel (BD), BCO/diesel, BCO/bio diesel emulsions was experimentally investigated. Performance and gaseous & particle emission characteristics of a diesel engine fuelled by BCO emulsions were examined. Results showed that stable engine operation was possible with emulsions and engine output power was comparable to diesel and bio diesel operation. However, in case of BCO/diesel emulsion operation, THC & CO emissions were increased due to the increased ignition delay and poor spray atomization and NOx & Soot were decreased due to the water and oxygen in the fuel. Long term validation of adopting BCO in diesel engine is still needed because the oil is acid, with consequent problems of corrosion and clogging especially in the injection system.
CTBA Geometry Compensation System
Moon, Ha-Kyung ; Lee, Byung-Rim ; Kim, Hyo-Seok ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 113~119
DOI : 10.7467/KSAE.2012.20.5.113
CTBA(Coupled Torsion Beam Axle) has been adapted as the rear suspension of a compact car. Because that has the advantage of cost and weight in comparison with multi-link type. But CTBA has the disadvantage in vehicle stability to become oversteer occurring toe-out of the rear wheel when cornering and braking. In this study, we suggested CTBA Geometry Compensation System to overcome the disadvantage of CTBA. We predicted braking and cornering vehicle performance from proposed equation and numerical simulation. And also, the results were compared to objective and subjective evaluation in vehicle.
Evaluation of Thermal Comfort and Cooldown Performance inside Automotive Cabin according to Air-conditioning Vent Location
Seo, Jin-Won ; Park, Jae-Hong ; Choi, Yun-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 120~129
DOI : 10.7467/KSAE.2012.20.5.120
As the recent advancement of automobile industry, there has been a great interest in the thermal comfort of the passengers inside the cabin of an automobile. Thermal comfort is affected by temperature, velocities, and mean radiation temperature of air, thermal resistance of clothes and physical active level of human. The present study performed computational analysis to select the location of air-conditioning vent that improves thermal comfort inside the cabin. In order to do this, we considered various air vent positions, and thermal flow analysis of each case is performed using CFD for the cabin with four passengers. The thermal comfort is evaluated using the computational results and the optimum location of air vent is suggested.
NOx Conversion Characteristics of HC-LNT System according to Secondary Injection Conditions in a Diesel Engine
Park, Jin-Kyu ; Oh, Jung-Mo ; Lee, Ki-Hyung ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 130~137
DOI : 10.7467/KSAE.2012.20.5.130
Automotive engines need strategies to satisfy with the emission regulations in terms of PM and NOx. HC-LNT (Hydrocarbon-Lean NOx Trap) with secondary injection system is considered as more practical technology in order to cope with emission regulations. The HC-LNT system, which is using diesel fuel itself as a reducing agent, absorbs NOx in lean exhaust gas condition and releases NOx in rich exhaust gas conditions. In this system, inappropriate amounts of reducing agent will slip through the LNT without the profits of conversion and cause additional emission problems. Therefore, the suitable amount of reducing agent should be supplied into the catalytic converter. In this research, engine emission test was conducted to optimize injection quantity at the various engine test conditions. Different exhaust layouts and catalyst shapes have been studied and extension unit which makes better uniformity of exhaust gas was used for HC-LNT system. From this results, the effect of secondary injection conditions on NOx conversion characteristics of HC-LNT was clarified.
Analysis of Agricultural Working Load Experiments for Reduction Gear Ratio Design of an Electric Tractor Powertrain
Kim, Jung-Yun ; Park, Yeong-Il ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 138~144
DOI : 10.7467/KSAE.2012.20.5.138
Recent environmental issues such as exhaust gas and greenhouse effect make the agricultural machinery market takes into account the hybrid and electric propulsion technology used in automotive engineering. Generally the agricultural machinery, particularly an agricultural tractor, needs large load capacity and long continuous operating time comparing with conventional vehicles. In case of a pure electric tractor, it is necessary for considering large capacity batteries and long charging time. Therefore we take an AER extended PHEV (All Electric Range extended Plug-in Hybrid Electric Vehicle) power transmission system in developing an electric tractor in this study. First we propose a PHEV powertrain structure in order to substitute the conventional diesel engine equipped tractor. And we performed the road tests using a conventional mechanical tractor with various load conditions, which were classified and statistically treated real agricultural works. The test results were analysed with respect to the power characteristics of the power source. Finally using the test result, we designed two-stepped reduction gear ratios in the proposed an electric tractor powertrain for carrying out typical agricultural works.
The Inlet Shape Optimization of Aftertreatment System for Diesel Engine with Taguchi Method
Jung, Jong-Hwa ; Kim, Jong-Hag ; Kim, Sang-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 145~151
DOI : 10.7467/KSAE.2012.20.5.145
New design of catalytic converter is proposed by optimization of DFSS (Design For Six Sigma) and DOE (Design Of Experiment) method which is based on taguchi matrix. As a result of the optimization of design of catalytic converter, this paper classifies Exhaust-downpipe shapes with 3 parameters to increase flow velocity uniformity of front catalytic substrate face from CFD results. after finishing with L9 Taguchi test matrix, it can be found the main effect of each design parameter of concept model, and optimal design level. in conclusion, it can be increase flow uniformity from 0.60 upto 0.80 with optimal diffuser shape for Turbo-charger.
A Study on the Characteristics of Wide Band Matching Connector in Round Coaxial Lines
Kim, Byeong-Woo ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 5, 2012, Pages 152~157
DOI : 10.7467/KSAE.2012.20.5.152
In this paper, smoothing plane connector have been proposed as the vehicle connector for the wireless access in vehicular environments (5.925GHz) communication. This smoothing plane connector is designed by considering the properties of critical parameter like smoothing distance of start to end point of contact area. The design simulation and results can be used to determine the most suitable smoothing plane wire dimensions for vehicle communication connector. The optimized WAVE connector inserted the smoothing plane wire has insertion loss less than-0.17dB at 5.925GHz. It provides 20% of insertion loss with good performance. Therefore, the simulated results can be effectively used for optimum design of high frequency connector for vehicle communication.