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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 19, Issue 6 - Nov 2011
Volume 19, Issue 5 - Sep 2011
Volume 19, Issue 4 - Jul 2011
Volume 19, Issue 3 - May 2011
Volume 19, Issue 2 - Mar 2011
Volume 19, Issue 1 - Jan 2011
Selecting the target year
The Effects of EGR and Hydrogen Enriched Gas on Diesel HCCI Engine
Park, Cheol-Woong ; Cho, Jun-Ho ; Oh, Seung-Mook ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 1~8
In recent years, there has been an interest in early-injection diesel engines as it has the potential of achieving a more homogeneous and leaner mixture close to TDC compared to standard diesel engine. The more homogeneous mixture may result in reduced NOx and soot emissions and higher efficiency in homogeneous charge compression ignition engines. While earlier studies have shown that a reduction in NOx emissions from HCCI engine is possible, there are some significant problems including the control of ignition timing and combustion rate. In order to investigate the effect of EGR and hydrogen enriched gas on combustion characteristics and emissions, an experiments with single cylinder CRDi engine were carried out concerning the formation of various premixed charge, which can achieved by early injection, EGR and hydrogen enriched gas. EGR was not effective to further reduce NOx and PM emissions. It was found that NOx emissions were decreased with an introduction of hydrogen enriched gas and an adequate diesel fuel amount.
Development of Torque Assisted Control Method for Integrated Starter/Alternato
Oh, Sung-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 9~16
Research on ISA(Integrated Starter/Alternator) receives wide attention as system voltage is increased to 42V Based on requirement of starter and alternator for the conventional vehicle, system requirement and specification are determined. Also to control proposed system, suitable control methods are proposed. Main control issues with ISA are whether torque assist is required and if so how much torque is needed. In this paper, vehicle performance with various control methods and capacity are simulated and simulation results are analyzed. Vehicle performance is analyzed with vehicle simulator. For the simulation, suitable ISA model is also developed.
Drive-train Jerk Reduction Control for Parallel Hybrid Electric Vehicles
Park, Joon-Young ; Sim, Hyun-Sung ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 17~24
TMED(Transmission Mounted Electric Device) parallel hybrid configuration can realize EV(Electric Vehicle) mode by disengaging the clutch between an engine and a transmission-mounted motor to improve efficiencies of low load driving and regenerative braking. In the EV mode, however, jerk can be induced since there are insufficient damping elements in the drive-train. Though the jerk gives demoralizing influence upon driving comport, adding a physical damper is not applicable due to constraints of the layout. This study suggests the jerk reduction control, composed of active damping method and torque profiling method, to suppress the jerk without hardware modification. The former method creates a virtual damper by generating absorbing torque in the opposite direction of the oscillation. The latter method reduces impulse on the mated gear teeth of the drive-train by limiting the gradient of traction torque when the direction of the torque is reversed. To validate the effectiveness of the suggested strategy, a series of vehicle tests are carried out and it is observed that the amplitude of the oscillation can be reduced by up to 83%.
Study on Vehicle Stability Enhancement for the PACE Formula Vehicle
Kim, Kwan-Ju ; Kim, Hyun-Jun ; Lee, Jun-Heon ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 25~31
The purpose of the study is to enhance the vehicle handling stability of the PACE formula vehicle. Required data for the dynamic analysis of the vehicle are as follows: Mass, moment of inertia, and tire's dynamic properties. Mass and moment of inertia data were calculated using Siemens NX 5.0 which results were verified with VIMF measurements of GMDAT. Dynamic data for the tire were supplied by Kumho Tire. Aerodynamic forces play an important role in the formula vehicle which forces were calculated by using Fluent. Full vehicle dynamic analysis using Carsim software has been carried out to find out the improvement of the vehicle stability by changing the shapes of the rear wing.
Effect of Clear Coat Film on Appearance Characteristics in Car Refinishing
You, Chang-Bae ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 32~37
In car refinishing, the paint film characteristics of clear coat play an important role in appearance quality. Thus, Primarily in this research, the variance of brightness with the change of the thickness of paint film is investigated. Besides, as changing the thickness of paint film, the correlation between surface leveling(which is one of appearance characteristics) is investigated in this research. Throughout this investigation, we come to know that the increase of clear coat paint film thickness leads the improvement of appearance characteristics within specific range of thickness. Furthermore, the fact that too thick paint film does not increase the brightness or appearance characteristic any more is known. The optimum thickness of clear coat film for the best and appearance characteristics is derived from this research and more efficient way of determining optimum thickness of paint film is found. Particularly, haze value and waviness have more influence on vividness than brightness. Throughout all experiments, the appearance characteristics are much better at painted horizontally than vertically. These results are derived due to the facts that to obtain the same paint film thickness at painted vertically with painted horizontally is difficult and the way of vertical painting is different from horizontal painting. Therefore, the improvement of vertical painting and horizontal painting are required.
Remanufacturing Industry for Automobile Parts of European
Mok, Hak-Soo ; Jeon, Chang-Su ; Han, Chang-Hyo ; Park, Sang-Jin ; SaKong, Hoon ; Gunther, Seliger ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 38~44
Remanufacturing is restoring or manufacturing the worn-out or discarded components of an end of life product in order to bring it to the "like new" condition. The aim is to reprocess used products in such a manner that the quality of the products is as good as or better than the new one, in terms of appearance, reliability and performance. This paper investigates the automotive remanufacturing industry in Europe. To further knowledge in this field, the paper focuses on the remanufacturing of the automotive components of end-of-life vehicles. The paper scope emphasizes key remanufacturing companies, which are identified and were surveyed in terms of their business structures. The research aims to address the potential for growth within the remanufacturing industry, with regard to various players. The state of the art in remanufacturing of automotive equipment will be identified.
Optimization of Conditions of Forming Quality for Hot-press-formed Lower Control Arm Using Finite Element Analysis
Son, Hyun-Sung ; Choi, Byung-Keun ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 45~50
Hot-Press-Forming (HPF), an advanced sheet metal forming method using stamping at a high temperature of about
and quenching in an internally cooled die set, is one of the most successful forming process in producing crash-resistant parts such as pillars and bumpers with complex shape, ultrahigh strength, and minimum springback. To optimize conditions of a forming quality in HPF process and secure a safe product without any failures, such as fractures and wrinkling, the simulations based on the coupled thermo-mechanical analysis for a hot-press-formed lower control arm are applied with Taguchi's orthogonal array experiment. Three factor variables - the friction coefficient, blank shape, and hole location for burring - are selected to be optimized. The most effective condition of a forming quality for a hot-press-formed lower control arm is suggested. The simulation results are confirmed with experimental ones.
Monitoring System Design for Estimating Lateral Velocity and Sideslip Angle
Han, Sang-Oh ; Huh, Kun-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 51~57
Information of the lateral velocity and the sideslip angle in a vehicle is very useful in many active vehicle safety applications such as yaw stability control and rollover prevention. Because cost-effective sensors to measure the lateral velocity and the sideslip angle are not available, reliable algorithms to estimation them are necessary. In this paper, a sliding mode observer is designed to estimate the lateral velocity. The side slip angle is estimated using the recursive least square with the disturbance observer and the pseudo integral. The estimated parameters from the combined estimation method are updated recursively to minimize the discrepancy between the model and the physical plant, and any possible effects caused by disturbances. The performance of the proposed monitoring system is evaluated through simulations and experiments.
An Experimental and Numerical Study on Automotive IRDS Condenser
Kim, Hak-Jun ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 58~65
The specific objective of this study was to develop an IRDS (integrated receiver drier subcooling) condenser model for use in a mobile air-conditioning system. A three-zone model based on the desuperheating, two-phase, and subcooling sections of a condenser could be used to estimate the performance with a good accuracy. Overall heat transfer coefficients for each of the three sections, expressed as a function of the air velocity across the condenser and refrigerant mass flow rate and the model using the elemental difference method incorporate calculations to determine the pressure drop, heat performance within the condenser and it includes physical parameters (pass, tube hole size and length) that can be varied to analyze potential design changes without exhaustive experimental efforts. it was found that an accuracy of heat performance was within 5% in case of using the various condensers, the refrigerant pressure drop was predicted within 25% and the pressure drop of air side was well matched with experiment data within 4%.
Design Optimization of an Automotive Injection Molded Part for Minimizing Injection Pressure and Preventing Weldlines
Park, Chang-Hyun ; Pyo, Byung-Gi ; Choi, Dong-Hoon ; Koo, Man-Seo ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 66~72
Injection pressure is an important factor in filling procedure for injection molded parts. In addition, weldlines should be avoided to successfully produce injection molded parts. In this study, we optimally obtained injection molding process parameters that minimize injection pressure. Then, we determined the thickness of the part to avoid weldlines. To solve the optimization problem proposed, we employed MAPS-3D (Mold Analysis and Plastics Solution-3 Dimension), a commercial CAE tool for injection molding analysis, and PIAnO (Process Integration, Automation, and Optimization) as a commercial PIDO (Process Integration and Design Optimization) tool. We integrated MAPS-3D into PIAnO, automated the analysis and design procedure, and performed optimization by employing PQRSM (Progressive Quadratic Response Surface Method) equipped in PIAnO. We successfully obtained optimization results, which demonstrates the effectiveness of our design method.
Speed-Based Emission Factor regarding Vehicle Specific Power and Acceleration during On-road Driving
Lee, Tae-Woo ; Keel, Ji-Hoon ; Park, Jun-Hong ; Park, Yong-Hee ; Hong, Ji-Hyung ; Lee, Dae-Yup ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 73~81
The performance of emission factor has been validated by comparison with on-road test data. Emission factor, which is a function of vehicle speed, has been acquired based on chassis dynamometer test with NIER driving pattern. Portable Emission Measurement System, PEMS has measured on-road emission. Test vehicle was operated on defined test routes under different driving conditions, and made ten trips along its route. Emission factors properly simulate on-road test result, although there is some drawback to consider variety of driving condition on real world. Vehicle specific power and acceleration have been used to explain the distributed on-road result within same vehicle speed range. The trend in carbon dioxide and nitrogen oxide emission with respect to specific power and acceleration is clear. It has been found that specific power is a good explanatory variable for microscopic analysis for modal test result. Acceleration is good for microscopic as well as macroscopic analysis.
Effect of Ethanol-gasoline Blending Ratio on Lean Combustion and Exhaust Emissions Characteristics in a SI Engine Fueled with Bioethanol
Yoon, Seung-Hyun ; Kim, Dae-Sung ; Lee, Chang-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 82~88
Lean combustion and exhaust emission characteristics in a ethanol fueled spark-ignited engine according to ethanol-gasoline fuel blending ratio were investigated. The test engine was
and 10.5 of compression ratio SI engine with 4 cylinders. In addition, lambda sensor system was connected with universal ECU to control the lambda value which is varied from 1.0 to 1.5. The engine performance and lean combustion characteristics such as brake torque, cylinder pressure and rate of heat release were investigated according to ethanol-gasoline fuel blending ratio. Furthermore, the exhaust emissions such as carbon monoxide (CO), unburned hydrocarbon (HC), nitrogen oxides (
) and carbon dioxide (
) were measured by emission analyzers. The results showed that the brake torque, cylinder pressure and the stability of engine operation were increased as ethanol blending ratio is increased. Brake specific fuel consumption (BSFC) was increased in higher ethanol blending ratio while brake specific energy consumption (BSEC) was decreased in higher ethanol blending ratio. The exhaust emissions were decreased as ethanol blending ratio is increased under overall experimental conditions, however, some specific exhaust emission characteristics were mainly influenced by lambda value and ethanol-gasoline fuel blending ratio.
A Study on Development of Oval Type High Efficient EGR Cooler
Lee, Joon ; Moon, Jeon-Il ; Han, Chang-Suk ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 89~94
The EGR system is one of important components in diesel engine. The regulation on NOx emission has been tightened up. Therefore, it is a significant issue to develop and commercialize the high efficient EGR cooler system that reduces NOx emission in DI diesel engine. Key performance factor of the EGR cooler system is how to properly design both wavy cooling fins and gas tubes. This paper proposes a high efficient EGR cooler that has been upgraded with both the optimized wavy cooling fins and the improved shape of structure. The evaluation of the heat exchange efficiency, outlet temperature, and gas pressure drop of the EGR cooler is performed with the prototype of the proposed EGR cooler. The result shows a good solution and will be implemented to the model of a clean diesel engine being developed for both domestic and overseas market.
An Experimental Study on the Secondary Waveform Analysis according to Measure of Electronic Control Waveform
Yoo, Jong-Sik ; Kim, Chul-Soo ; Cha, Kyoung-Ok ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 95~100
The test was done on cars travelling at speeds of 20km/h, 60km/h and 100km/h, the performance testing mode for chassis dynamometer. In this test, the secondary waveform were measured, including those using faulty MAP sensors, oxygen sensors and spark plugs. The results from these measurements and their analysis of secondary waveform can be summarized as follows: 1) The secondary waveform measured from the faulty oxygen sensor showed a lot of noise around peak voltage and in the rising and falling sections during spark line which means that the air fuel mixture was non-homogeneous. 2) The secondary waveform from the faulty MAP sensor showed the worst shape compared to other sensors, including variation of spark line, state of air-fuel mixture and velocity of flame front. 3) The spark line time of secondary waveform using a faulty spark plug displayed the shortest and smallest energy spark line, which means that a misfire occurred.
The Effect of Cooling Efficiency on Fouling by EGR Cooler Internal Shape
Nam, Youn-Woo ; Oh, Kwang-Chul ; Lee, Chun-Hwan ; Lee, Chun-Beom ; Lee, Won-Nam ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 101~108
Understanding the exhaust gas recirculation (EGR) cooler fouling in diesel engine is important factor in the durability characteristic of a EGR system. We develope a test rig and PM feeder using carbon black to examine the effect of fouling on EGR cooler devices those were consisted of flat and shell & tube type. The EGR cooler fouling process is a complex interaction involving heat exchanger shape, boundary condition, constitutes, chemistry and operating mode. As the soot deposited to EGR cooler, these formed a thin deposit layer that was less heat exchange than the fresh status of tube enclosing the exhaust gas, resulting in lower heat exchange effectiveness in both type coolers. But these deposits caused different results in pressure drop, it is increased in flat type, but decreased in Shell & tube type of EGR cooler. A cause was estimated from a change of the flow structure and a decrease of contact area as the EGR cooler fouling.
A Mobile Emission Laboratory for Car Chasing Experiment
Lee, Seok-Hwan ; Kim, Hong-Seok ; Lee, Seung-Jae ; Bae, Gwi-Nam ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 109~116
To measure the traffic pollutants with high temporal and spatial resolution under real conditions a mobile emission laboratory (MEL) was designed and built in KIST with close-cooperation with KIMM and Yonsei university. The equipment of the mini-van provides gas phase measurements of CO, NOx,
, THC (Total hydrocarbon) and number density & size distribution measurements of fine and ultra-fine particles by a fast mobility particle sizer (FMPS) and a condensation particle counter (CPC). The inlet sampling port above the bumper enables the chasing of different type of vehicles. This paper introduces the construction and technical details of the MEL and presents data from the car chasing experiment of diesel and CNG city bus. The dilution ratio was increased rapidly according to the chasing distance. Most particles from the diesel city bus were counted under 300 nm and the peak concentration of the particles was located between 40-60 nm. However, the most particles from the CNG city bus were nano particle counted under 50 nm.
A Study on NOx Reduction Efficiency according to Various Injectors used for De-NOx System
Han, Young-Deok ; Oh, Jung-Mo ; Lee, Ki-Hyung ; Lee, Jin-Ha ; Mun, Woong-Ki ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 117~124
Automotive engines require strategies to fulfill the emission regulations in terms of NOx and PM. A dramatic reduction in NOx and PM emissions could be achieved with high pressure injection, innovative combustion strategies and EGR. Recently, Lean NOx Trap (LNT) and Urea-SCR are considered as more practical strategy to suppress the engine-out emissions substantially for copying with severe regulation. These systems need to reduce the reducing agent injection system which has a huge impact on NOx purification efficiency. In this paper, different three injectors have been used to investigate spray characteristics and engine emission test was conducted to clarify the effect of these injectors on the NOx reduction.
Dynamic Analysis of Engine Valve Train with Flexible Multibody Model Considering Contact between Components
Hwang, Won-Gul ; Sung, Won-Suk ; Ahn, Ki-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 125~132
The dynamic characteristics of valve train are responsible for the dynamic performances of engine. We derived the equation of motion for 6 degrees of freedom model of the valve train. Computer model is also developed with flexible multibody model considering contact between components. The simulation results with these two models are compared with experimental results. We investigated the effect of the two spring models, TSDA (Translational Spring Damper Actuator) element and flexible body model, on the valve behavior and spring force. It is found that the dynamic behavior of the two models are not very different at normal operational velocity of the engine. By modeling contact between cam and tappet, the stress distributions of the cam were found. Using stress distribution obtained, contact width and contact stresses of the cam surface were calculated with Hertz contact theory.
Analysis of Cylinder Compression Pressure Uniformity and Valve Timing by Start Motor Current and Cylinder Pressure during Cranking
Kim, In-Tae ; Park, Kyoung-Suk ; Shim, Beom-Joo ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 133~138
Compression pressure of individual cylinder and valve timing have big influence on combustion pressure, indicated mean effective pressure (IMEP), emission, vibration, combustion noise and many other combustion parameters. Therefore, uniformity of compression pressure and valve timing became one of most important engine design and production standard. Conventional method to evaluate compression pressure uniformity is to measure each cylinder pressure by mechanical pressure gage during cranking. This conventional method causes inaccuracy of cylinder pressure measurement because of different cranking speed results from battery status and also causes high manhour and cost. To check valve timing, related FEAD parts should be disassembled and timing mark should be checked manually. This study describes and suggests new methodology to measure compression pressure by analysis of start motor current and to check valve timing by cylinder pressure with high accuracy. With this new methodology, possibility to detect leaky cylinder and wrong valve timing was observed.
Noise Characteristics and Frequency Response Function on Implementation of AZ31 Magnesium Alloy to Automobile Hood Panel
Lee, Choong-Do ; Yeo, Dong-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 1, 2011, Pages 139~146
In present study, it aims to compare the noise and vibration characteristics between magnesium alloy and steel hood panel. The AZ31 magnesium hood panel was fabricated through warm forming process, and the noise and vibration characteristics between both hood panels was compared through the measurement of engine radiation noise and transmission loss, as well as FRF on modal analysis. The sound insulation performance of magnesium alloy was wholly superior to that of steel hood panel, even though the transmission loss of magnesium alloy is lower than that of steel due to mass effect primarily. The FRF characteristics on modal analysis indicates that the resonance frequency of magnesium hood panel is remarkably increased to higher value than that of steel hood panel. The radiation and interior noise of magnesium panel even without acoustic hood insulation were remarkably lower than those of steel hood panel with acoustic insulation, in particular, at a range below 4,000 rpm.