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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 16, Issue 6 - Nov 2008
Volume 16, Issue 5 - Sep 2008
Volume 16, Issue 4 - Jul 2008
Volume 16, Issue 3 - May 2008
Volume 16, Issue 2 - Mar 2008
Volume 16, Issue 1 - Feb 2008
Selecting the target year
A Study of Electrical Control Kit for Damping Force of Automotive Shock Absorber
Sohn, Il-Seon ; Lee, Jeong-Goo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 1~6
The performance of shock absorber is directly related to the car behavior and performance, both for handling and comfort. Most of compact car are assembled the passive shock absorber for cost effect but some of compact driver want better performance of shock absorber than standard parts. Therefore, they want the semi-active suspension control system instead of standard damper system. But they only can change the mechanical damping control shock absorber at A/S market. The mechanical damping control shack absorber can not vary the damping force in driving condition so they do not satisfy the mechanical damping control shock absorber system. In this study, electrically damping force controlled shock absorber system is developed based on the mechanical damping force control damper system. This system can vary damping force by switch on dashboard in driving condition. And, this system can satisfy the requirement of tuning market. Therefore, it is expected the system to show the engineering capability of korean damper company and to increase export market share to oversea damper market.
Development of the Optimized Autonomous Navigation Algorithm for the Unmanned Vehicle using Extended Kalman Filter
Yun, Duk-Sun ; Yu, Hwan-Shin ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 7~14
Unmanned vehicle has a performance for finding the path and the way point by itself, so called orientation and direction. For the more precise navigation performance, Extended kalman filter, which is integrated with inertial navigation system and global positioning system is proposed in this paper. Extended kalman filter's performance is evaluated by the simulation and applied to the unmanned vehicle. The test result shows the effectiveness of Extended kalman filter for the navigation.
Prediction of Crack Propagation Path Using Boundary Element Method in IC Packages
Chung, Nam-Yong ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 15~22
Applications of bonded dissimilar materials such as integrated circuit(IC) packages, ceramics/metal and resin/metal bonded joints, are very increasing in various industry fields. It is very important to analyze the thermal stress and stress singularity at interface edge in bonded joints of dissimilar materials. In order to investigate the IC package crack propagating from the edge of die pad and resin, the fracture parameters of bonded dissimilar materials and material properties are obtained. In this paper, the thermal stress and its singularity index for the IC package were analyzed using 2-dimensional elastic boundary element method(BEM). From these results, crack propagation direction and path by thermal stress in the IC package were numerically simulated with boundary element method.
A Development of Safety Window System Module Considering Active Safety Technology
Lee, Jong-Soon ; Son, Il-Moon ; Kwak, Hyo-Yean ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 23~29
It is necessary to develope the active safety system in terms of driver's safety and convenience. In this paper, we were developed the non-contact type of safety window system operated by the initial value of feedback control such as the output signal of photo sensor. It was designed based on the control algorithm with an improved load sensitivity. Therefore, compared with the existing system, it is possible to prevent the occurrence of a mull-function. Also, it has a convenient functions of the window such as an auto up/down and closing, and has a response times better. It can be installed the various types of common vehicles that have the different movement distance and speed of window. In conclusion, the developed system may be adapted the vehicle commercially.
Evaporation Pressure Drop of Carbon Dioxide in Horizontal Tubes with Inner Diameter of 4.57 mm and 7.75 mm
Son, Chang-Hyo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 30~37
The evaporation pressure drop of
(R-744) in horizontal tubes was investigated experimentally. The experiments were conducted without oil in a closed refrigerant loop which was driven by a magnetic gear pump. The main components of the refrigerant loop are a receiver, a variable-speed pump, a mass flow meter, a pre-heater and evaporator (test section). The test section consists of a smooth, horizontal stainless steel tube of 7.75 and 4.57 mm inner diameter. The experiments were conducted at saturation temperature of
, and heat flux of 10 to
. The test results showed the evaporation pressure drop of
are highly dependent on the vapor quality, heat flux and saturation temperature. The pressure drop measured during the evaporation process of
increases with increased mass flux, and decreases as the saturation temperature increased. The evaporation pressure drop of
is very lower than that of R-22. In comparison with test results and existing correlations, the best fit of the present experimental data is obtained with the correlation of Choi et al. But existing correlations failed to predict the evaporation pressure drop of
. Therefore, it is necessary to develop reliable and accurate predictions determining the evaporation pressure drop of
in a horizontal tube.
Hydro-forming Process of Automotive Rear Sub-frame by Computer Simulation (CAE)
Kim, Kee-Joo ; Sung, Chang-Won ; Baik, Young-Nam ; Lee, Yong-Heon ; Bae, Tae-Sung ; Sohn, Il-Seon ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 38~43
The hydroforming technology has been spreaded dramatically in automotive industry last 10 years. Itmay cause many advantages to automotive applications in terms of better structural integrity of the parts, lower cost from fewer part count, material saving, weight reduction, lower springback, improved strength and durability and design flexibility. In this study, the whole process of rear sub-frame parts development by tube hydroforming using steel material having tensile strength of 440MPa grade is presented. At the part design stage, it requires feasibility study and process design aided by CAE (Computer Aided Design) to confirm hydroformability in details. Effects of parameters such as internal pressure, axial feeding and geometry shape in automotive rear sub-frame by hydroforming process were carefully investigated. Overall possibility of hydroformable sub-frame parts could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of tube material on every forming step such as pre-bending, preforming and hydroforming. In addition, all the components of prototyping tool are designed and interference with press is examined from the point of geometry and thinning.
Characteristic Analysis of BLDC Motor for Vehicle Compressor Based on High Voltage
Kim, Byeong-Woo ; Cho, Hyun-Dock ; Lee, Do-Hee ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 44~51
The performance design and analysis of an electric motor for vehicles is very complicated due to the variety of parameters. This paper presents the design of the BLDC motor for electric air compressor in high voltage(42V) system and compares with the characteristics of IPM, SPM type BLDC motor. Futher, optimal design for the electric motor has been carried out using Equivalent Magnetic Circuit and FEM Modelling. By analyzing the design results, it is found that design parameters for BLDC motor provided an useful tool for vehicles motor design.
Friction Coefficient of Emergency Braking on ABS and Non-ABS Car
Kim, Kee-Nam ; Lee, Ji-Hoon ; Ok, Jin-Kyu ; Yoo, Wan-Suk ; Park, Ji-Yeong ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 52~59
Most accident reconstruction or analysis depend on the coefficient of friction to estimate the vehicle speeds. Skid mark and coefficient of friction are usually utilized to calculate the velocity and behavior of vehicles. For a critical case such as traffic accident reconstruction, however, the initial velocity of the car should be calculated precisely. In this paper, emergency brake tests on ABS and Non-ABS brake system are conducted on the dry pavement asphalt road on speed 40, 60, 80 and 100 km/h respectively. The SWIFT sensor was established in the front wheel and rear wheel at driver side to measure the forces, moments and speeds of revolution of the tires. These tests results can be available to brake tests and accident reconstruction.
Study of Development of a Dust-proof Oil Cooler
Lee, Young-Lim ; Jeon, Euy-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 60~65
A typical louvered-fin oil cooler can be easily contaminated under dusty environment hence resulting in poor performance of a heat exchanger. Thus, in this study, a dust-proof oil cooler has been studied with a unique shape of a 3-dimensional wavy fin since non-louvered fins could have better performance under dusty environment compared to louvered fins. Recently, they have been introduced to commercial and constructional vehicles in Japan. At first numerical analysis has been done to optimize the angle of the wavy fin so that the oil cooler developed can satisfy the target performance. The wavy fin has been then made with roll-forming and roll-pitch stands, and a prototype of an oil cooler with the wavy fin has been finally built with brazing. The performance test showed that the heat release rate of the oil cooler was well beyond the target, 4.94kW and the air-side pressure drop was below the criterion, 0.19kPa. In addition, the results showed that the numerical prediction was effective enough to design the dust-proof oil cooler that satisfies the performance criteria.
A Study on Cold Start Emission Characteristics using the Syngas in a SI Engine
Song, Chun-Sub ; Kim, Chang-Gi ; Kang, Kern-Young ; Cho, Yong-Seok ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 66~72
Fuel reforming technology for the fuel cell vehicles could be adopted to internal combustion engine for the reduction of engine out emissions. Since syngas which is reformed from fossil fuel has hydrogen as a major component, it has abilities to enhance the combustion characteristics with wide flammability and high speed flame propagation. In this paper, syngas was feed to 2.0 liter gasoline engine during the cold start and early state of idle condition. Not only cold start HC emission but also
emission could be dramatically reduced due to the fact that syngas has no HC and has nitrogen up to 50% as components. Exhaust gas temperature was lower than that of gasoline feeding condition. Delayed ignition timing, however, resulted in increased exhaust gas temperature approximated to gasoline condition. It is supposed that the usage of syngas in the gasoline internal combustion engine is an effective solution to meet the future strict emission regulations by the reduction of cold start THC and
Combustion Optimization of Diesel 2.0 Liter Class Engine with 8-hole Injector Nozzle
Kwon, Soon-Hyuk ; Kim, Min-Su ; Choi, Min-Seon ; Cho, Sung-Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 73~79
Atomization speed of diesel fuel injected from 8-hole nozzle is faster than that of 7-hole nozzle because the hole diameter of 8-hole nozzle is smaller than that of 7-hole nozzle. But both insufficient distance between the fuel sprays and short penetration of injected sprays through 8-hole nozzle hole cause many harmful effects on combustion. In this study, we installed the 8-hole injectors to diesel 2.0 liter class engine, and optimized in-cylinder swirl and penetration via selecting and matching proper cylinder head and combustion bowl. Through this process, we found out the performance and emission potential of 8-hole nozzle installed engine are better than those of 7-hole nozzle installed one.
The Experimental Study on Characteristics of Valve System using Hole Type Valve Lift Sensor
Moon, Gun-Feel ; Lee, Yong-Gyu ; Lee, Seong-Jin ; Choi, Kyo-Nam ; Jeong, Dong-Soo ; Park, Sung-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 80~86
Recently, controlled auto ignition(CAI) in gasoline engines are drawing more attentions due to its extremely low level of NOx emissions and potentials in lowering the fuel consumption rate. The one of the key techniques for realizing CAI combustion in engines is the control of valve system. Since the valve linkage system with higher complexity, or even earn-less valve systems, such as electro-hydraulic and electro-magnetic system, are adopted in CAI engines, it is not easy to estimate the valve lift profile from earn profiles. Therefore new measurement techniques for valve lift in CAI engines have been tried and tested. In this paper, hole type valve lift sensor was developed and tested to check the applicability in CAI engines. The valve lifts could be obtained from the sensor signal, which depends on the distance from the sensor to magnet attached to valve. Various engine speeds, ranging from 2,000 to 6,000 rpm, and valve lifts, maximum up to 9.7 mm, were tested. It was found that the sensor output for valve lift had accuracy of 98% in comparison with the basic specifications of valve lift through improvements of sensor driving circuit.
Experimental Studies on the Stack Cooling Performance Using a
Air Conditioning System in Fuel Cell Vehicles
Kim, Sung-Chul ; Kim, Min-Soo ; Won, Jong-Phil ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 87~93
air conditioning system installed in fuel cell vehicles could be used either for stack cooling or for cabin cooling, and thus was used for the stack cooling when additional stack heat release was required over a fixed radiator capacity for high power generation. This study investigated the performance of the stack cooling system using
air conditioner at various operating conditions. Also, the heat releasing effectiveness and mutual interference were analyzed for the stack cooling system using an air conditioner and compared with the conventional radiator cooling system with/without cabin cooling. The heat release of the stack cooling system with the aid of
air conditioner increased up to 36% more than that of the conventional radiator cooling system with cabin cooling. Furthermore, the heat release of the stack cooling system using
air conditioner increased more by 7% than that of the conventional radiator cooling system without cabin cooling.
Study on Shortening Light-Off Time of Three Way Catalyst and Reduction of Harmful Emissions with Exhaust Synthetic Gas Injection(ESGI) Technology during Cold Start of SI Engines
Cho, Yong-Seok ; Lee, Seang-Wock ; Won, Sang-Yeon ; Song, Chun-Sub ; Park, Young-Joon ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 94~101
Since regulations of exhaust emissions are continuously reinforced, studies to reduce harmful emissions during the cold start period of SI engines have been carried out very extensively worldwide. During the cold start period, raising the temperature of cold exhaust gas is a key strategy to minimize the light-off time of three way catalysts. In this study, a synthetic gas containing a large amount of hydrogen was injected into the exhaust manifold to raise the exhaust gas temperature and to reduce harmful emissions. The authors tried to evaluate changes in exhaust gas temperature and harmful emissions through controlling the engine operating parameters such as ignition timings and lambda values. Also the authors investigated both combustion stability and reduction of harmful emissions. Experimental results showed that combustion of the synthetic gas in the exhaust manifold is a very effective way for solving the problems of harmful emissions and light-off time. The results also showed that the strategy of retarded ignition timings and increased air/fuel ratios with ESGI is effective in raising exhaust gas temperature and reducing harmful emissions. Futhermore, the results showed that engine operating parameters ought to be controlled to lambda = 1.2 and ignition timing =
conditions to reduce harmful emissions effectively under stable combustion conditions.
Experiments on Temperature Effect on Air Cavity Resonance and Tire's Vibration Characteristics of a Radial Tire
Kim, Yong-Woo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 102~110
It is well known that the acoustic cavity inside the tire-wheel assembly contributes to vehicle interior noise and ride comfort. In this paper, we performed acoustic and structural modal testings by varying the temperature ranging from
to investigate the effects of temperature on acoustic cavity resonance and structural vibration characteristics for unloaded and loaded tires. The testing has given us some findings, which are reported in this paper.
Effects of the Balance Hole Diameter of an Automotive Closed Type Water Pump on Hydraulic Performance and Axial Force
Lee, Gee-Soo ; Heo, Hyung-Seok ; Kim, Hyun-Chul ; Oh, Chang-Bok ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 111~117
The aim of this paper was to investigate the fluid dynamic behavior of the automotive closed type water pump with balance hole in order to evaluate and justify its overall hydraulic performance and, in particular to analyze the effects of the balance hole on the reduction of hydraulic flow force of it. The analysis has been peformed by applying the commercial computational fluid dynamics (CFD) code, Fluent, to the solution of the 3-D turbulent flow fields of automotive closed type water pump. The reliability of the employed analysis was demonstrated by the comparison between numerical result and experimental data. Although, hydraulic head of the closed type water pump with 3mm diameter of balance hole decreased by 1.1%, axial flow force was effectively reduced by 13.3%, comparison of it with no hole at design point.
Stability Analysis of a Maglev Vehicle Utilizing Electromagnetic Suspension System
Han, Hyung-Suk ; Kim, Sook-Hee ; Yim, Bong-Hyuk ; Hur, Young-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 118~126
The levitation stability of a Maglev vehicle utilizing electromagnetic suspension is primarily influenced by the deformation, roughness, and vibration of the guideway. Optimum design for both the vehicle and the guideway is desirable in order to reduce guideway construction cost, while meeting requirements for stability and ride quality. This paper presents an analysis of the levitation stability of the UTM-01, an urban Maglev vehicle, using a numerical simulation. The ODYN/Maglev, a dynamics analysis program, is used to simulate dynamics to evaluate the stability. A running test of the UTM-01 is also carried out to verify the results of the simulation. Using the simulation results, the levitation stability of the UTM-01 can be numerically analyzed at a variety of vehicle speeds.
Stability Control of Four-Wheel Steering Vehicles
Ko, Young-Eun ; Song, Chul-Ki ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 127~136
Vehicle stability is a very important subject in vehicle design and control, because vehicle safety is closely dependent upon its dynamic stability. The control logic for four-wheel steering(4WS) systems, in which maintaining at least the specified stability region is the control objective, was constructed using the simplified vehicle model of 3 degree-of-freedoms. The improvement of vehicle stability was verified through computer simulations for the slalom and the double lane change maneuver using the multi-body dynamic model in MSC.ADAMS.
Contact Fatigue Life Prediction of Automotive Wheel Bearing
Lee, Sang-Don ; Moon, Kil-Hwan ; Cho, Yong-Joo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 137~143
For most bearings, it is a common requirement to have long durability. Especially wheel bearing fatigue life is the most important in automotive quality. The contact fatigue life analysis of automotive wheel bearing considering real raceway rough surface is presented in this paper. Contact stresses are obtained by contact analysis of a semi-infinite solid based on the use of influence functions; the subsurface stress field is obtained using rectangular patch solutions. Mesoscopic multiaxial fatigue criterion which can yield satisfactory results for non-proportional loading is then applied to predict fatigue damage. Suitable counting method and damage rule were used to calculate the fatigue life of random loading caused by rough surface. The life analysis considering real rough surface of wheel bearing raceway is in good agreement with the experimental results.
A Study on Oil Separation Performance of Crank-Case Ventilation System
Seo, Joon-Ho ; Na, Byung-Chul ; Kim, Jin-Yong ; Park, Seung-Uk ; Lim, Dae-Soon ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 144~150
This research aims to develop parts for advanced fuel/oil filtering re-circulation applicable to this kind of regulation proof engines. These parts can playa role of converting traditional air emission type crankcase into recovery type crankcase so that the engine can deal with environmental regulations, which do not allow minimal amount of toxic gas discharge. For the experiment, test method and specially made testing equipment are prepared. The results showed that oil separation efficiency of the cone type CCV(Crank Case Ventilation) system was higher than one of cylinder type both in bench test and in engine.
Characteristic Analysis of the Damper Cylinder for the Automotive Hydraulic Clutch System
Lee, Choon-Tae ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 151~158
The clutch system is a subcomponent of the transmission that is designed to engage and disengage power flow between the engine and the transmission. Recently, the engine power of automobile has been continuously increased because of customer's demand for the bigger one. As the engine power is increased, the vibration transmitted to the hydraulic clutch operating system has been increased. Therefore the demand for the reduction of clutch pedal vibration during the operation has been increased. This paper describes the pressure pulsation reduction characteristics of the damper cylinder which is applied to the hydraulic clutch operating system. And the purpose of this study is to propose an analysis model and investigate the effect of the design variable variations for the hydraulic clutch system. Especially, we studied the effect of damper cylinder parameter variations on the hydraulic clutch system performance.
Development of Optimum High Pressure Algorithm for a Transcritical
Mobile Air-Conditioning System
Lee, Jong-Bong ; Lee, Jun-Kyoung ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 159~165
This paper deals with the optimum high pressure control algorithm for a transcritical
mobile air-conditioning system with belt-driven compressor to achieve the maximum COP. The experiments were performed to find out the maximum COP conditions with various operating conditions. The experimental results showed that the COP was increased and then decreased with increase of the refrigerant high pressure for the system. Therefore the value of high pressure which has maximum COP could be selected. Furthermore, the strong (linear) relation between the optimum high pressure and the gas cooler outlet temperature was revealed, which suggests the use of a simple controller with only one parameter for the transcritical
Development of the Optimization Design Module of a Brake System
Jung, Sung-Pil ; Park, Tae-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 166~171
In this paper, the optimization design module for the brake system of a vehicle is developed. As using this module, design variables, that minimize an object function and satisfy nonlinear constraint conditions, can be found easily. Before an optimization is operated, Plackett-Burman design, one of the factorial design methods, is used to choose the design variables which affect a response function significantly. Using the response surface analysis, second order recursive model function, which informs a relation between design variables and response function, is estimated. In order to verify the reliability of the model function, analysis of variances(ANOVA) table is used. The value of design variables which minimize the model function and satisfy the constraint conditions is predicted through Sequential Quadratic-Programming (SQP) method. As applying the above procedure to a real vehicle simulation model and comparing the values of object functions of a current and optimized system, the optimization results are verified.
An Experimental Study on the Performance Characteristics of the Vortex Tube for Substitution of the Intercooler in a Common-rail Diesel Engine
Im, Seok-Yeon ; Choi, Doo-Seuk ; Ryu, Jeong-In ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 172~178
An object of this study is to confirm performance characteristics of the vortex tube apparatus for substitution of the intercooler in a common-rail diesel engine. The turbo pressure, the intake air flow rate and the
decrease ratio of the intercooler were measured in a experimental engine. The vortex tube apparatus was made after confirmation of the geometric phenomena in fundamental experiments. To investigate energy separation characteristics of the vortex tube, the measured turbo pressure was applied to the vortex tube inlet and the
decrease ratio was compared with one of the intercooler in the cold air mass flow ratio similar to the intake air flow rate of the experimental engine. From the results, we found that the energy separation ratio is increased according to of the inlet pressure and the
decrease ratio of the vortex tube apparatus is higher than one of the intercooler at low engine speed and engine load of medium and low.
Reduction and Effects of
/NO Ratios on the De-
Jung, Seung-Chai ; Yoon, Woong-Sup ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 3, 2008, Pages 179~187
A mathematical modeling of
-SCR process is conducted. The present deterministic model solves one-dimensional conservation equations of mass and species concentrations for channel flows and the catalytic reaction. NO and
reactions by the vanadium catalyst in the presence of
are calculated with the rate expressions of Langmuir-Hinshelwood scheme. The modeling was validated with extensive empirical data regarding
reduction efficiency. Analysis of De-
sensitivity conducted with regard to oxygen and water yielded highly accurate prediction over a wide range of
ratios from 0 to 1 in a temperature range of
reduction largely depends on
ratio at temperatures lower than
. NO reduction efficiency is significantly augmented with increasing in
/NO ratio at higher temperatures, whereas rather insensitive to the
/NO ratio at lower temperatures.