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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 24, Issue 5 - Sep 2016
Volume 24, Issue 4 - Jul 2016
Volume 24, Issue 3 - May 2016
Volume 24, Issue 2 - Mar 2016
Volume 24, Issue 1 - Jan 2016
Selecting the target year
Development of a Numerical Algorithm for the Evaluation of Aerodynamic Driving Stability of a Vehicle
Kim, Chul-Ho ; Kim, Chang-Sun ; Lee, Seung-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 265~272
DOI : 10.7467/KSAE.2016.24.3.265
The objective of vehicle aerodynamic design is on the fuel economy, reduction of the harmful emission, minimizing the vibration and noise and the driving stability of the vehicle. Especially for a sedan, the driving stability of the vehicle is the main concern of the aerodynamic design of the vehicle indeed. In this theoretical study, an evaluation algorithm of aerodynamic driving stability of a vehicle was made to estimate the dynamic stability of a vehicle at the given driving condition on a road. For the stability evaluation of a driving vehicle, CFD simulation was conducted to have the rolling, pitching and yawing moments of a model vehicle and compared the values of the moments to the resistance moments. From the case study, it is found that a model sedan running at 100 km/h in speed on a straight level road is stable under the side wind with 45 m/s in speed. But the different results may be obtained on the buses and trucks because those vehicles have the wide side area. From the case study of the model vehicle moving on 100 km/h speed with 15 m/s side wind is evaluated using the numerical algorithm drawn from the study, the value of yawing moment is
, rolling moment
and pitching moment
. These values are smaller than each value of rotational resistance moment the model vehicle has, and therefore, the model vehicle's driving stability is guaranteed when driving 100 km/h with 15 m/s side wind.
Quasi-static Analysis of Vehicle Seatbelt Using Analysis of Variance and Improvement of Tensile Test Correlation
Lee, Kwangseop ; Eo, Youngwoo ; Kim, Samsung ; Kim, Dooyong ; Song, Taeckrim ; Lee, Kyeongsang ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 273~278
DOI : 10.7467/KSAE.2016.24.3.273
This study makes a relative comparison of the results of tensile test and quasi-static analysis using AGL(Adjuster Guide Loop) model that plays a role in adjusting the height of shoulder belt, of the components of the vehicle seatbelt system and attempts to propose a method of reducing the error rate of the quasi-static analysis technique effectively. This study selects two major factors affecting the result of an analysis, draws the result of analysis through the method of experimental design, one of the statistical techniques and understands the contribution rate of the major factors affecting the result of the analysis through ANOVA(Analysis of Variance).
Robust Design of Crankshaft
Lee, Seungwoo ; Yang, Chulho ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 279~284
DOI : 10.7467/KSAE.2016.24.3.279
Finite element analysis along with DOE scheme has been performed to obtain robust design of crankshaft assembly. This study focused on obtaining optimized fillet radius of crankshaft mainly by statistical approach. 27 design cases using 3 factors with 3 levels are constructed by design of experiment. Changes of design factors and noise factor may influence the durability of crankshaft system. General two stages of robust design may enhance the durability of crankshaft model. Increasing crank arm thickness was adopted as a shrink step and change of fillet radius was used as a shift step. By combining these two steps, the stress concentration at the fillet area is reduced and adequate fillet radius is determined for the robust design of crankshaft.
A Study on Durability Characteristics for Plungers of Conventional Ceramic and Surface Modification by Powder Coating Using High Velocity Oxygen Fuel Thermal Spray
Bae, Myung-whan ; Park, Byoung-ho ; Jung, Hwa ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 285~293
DOI : 10.7467/KSAE.2016.24.3.285
The high velocity oxygen fuel(HVOF) thermal spray is a kind of surface modification techniques to produce the sprayed coating layer. This process is to form the coating layer after spraying the powder to molten or semi-molten state by the ultra-high speed at the high-temperature heat source and conflicting with a substrate. The efficiency of thermal spraying is dropped, however, because the semi-molten powder in a spray process become a factor that degrades the mechanical property by the formed pore within the coating layer. Therefore, it is necessary to melt completely the thermal spray powder in order to produce the coating layer with an optimal adhesive force. In this study, to improve the wear resistance, corrosion resistance and heat resistance, the plungers of high-speed and ultra-high pressure reciprocating hydraulic pumps used in ironworks are manufactured with STS
and are coated by the powders of WC-Co-Cr and WC-Cr-Ni including the WC of high hardness using a HVOF thermal sprayer developed in this laboratory. These are called by the surface-modified plungers. The surface roughness, hardness, and surface and cross-sectional microstructure of these two surface-modified and conventional ceramic plungers are measured and compared before operation with after operation for 100 days. It is found that the values of centerline average surface roughness and maximum height for conventional ceramic plunger are 9.5 to 10.8 and 5.2 to 5.7 times higher than those of surface-modified ones coated by WC-Co-Cr and WC-Cr-Ni because the fine tops and bottoms on surface roughness curve of conventional ceramic plunger are approximately 100 times higher than those of surface-modified ones. In addition, the pores and scratches in the surface microstructure are considerably formed in the order of conventional ceramic, WC-Cr-Ni and WC-Co-Cr surface-modified plungers. The greater the WC content of high hardness powder is less the change in the plunger surface.
Dynamic Performance Analyzing of In-wheel Vehicle considering the Real Driving Conditions and Development of Derivation System for Applying Dynamometer Using Drive Motor's Dynamic Load Torque
Son, Seungwan ; Kim, Kiyoung ; Cha, Suk Won ; Lim, Won Sik ; Kim, Jungyun ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 294~301
DOI : 10.7467/KSAE.2016.24.3.294
This paper discusses about analyzing in-wheel vehicle's dynamic motion and load torque. Since in-wheel vehicle controls each left and right driving wheels, it is dangerous if vehicle's wheels are not in a cooperative control. First, this study builds the main wheel control logic using PID control theory and evaluates the stability. Using Carsim-Matlab/Simulink, vehicle dynamic motion is simulated in virtual 3D driving road. Through this, in-wheel vehicle's driving performance can be analyzed. The target vehicle is a rear-wheel drive in D-class sedan. Second, by using the first In-wheel vehicle's performance results, it derivate the drive motor's dynamic load torque for applying the dynamometer. Extracted load torque impute to dynamometer's load motor, linear experiment in dynamometer can replicated the 3-D road driving status. Also it, will be able to evaluate the more accurate performance analysis and stability, as a previous step of actual vehicle experiment.
A Study of NH
Adsorption/Desorption Characteristics and Model Based Control in the Urea-SCR System
Ham, Yunyoung ; Park, Suyeol ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 302~309
DOI : 10.7467/KSAE.2016.24.3.302
Urea-SCR system is currently regarded as promising NOx reduction technology for diesel engines. SCR system has to achieve maximal NOx conversion in combination with minimal
slip. In this study, model based open loop control for urea injection was developed and assessed in the European Transient Cycle (ETC) for heavy duty diesel engine. On the basis of the transient modeling, the kinetic parameters of the
adsorption and desorption are calibrated with the experimental results performed over the zeolite based catalyst.
storage or surface coverage of SCR catalyst can not be measured directly and has to be calculated, which is taken into account as a control parameter in this model. In order to reduce
slip while maintaining NOx reduction,
storage control algorithm was applied to correct the basic urea quantity. If the actual
surface coverage is higher than the maximal
surface coverage, the urea injection quantity is significantly reduced in the ETC cycle. By applying this logic, the resulting
slip peak can be avoided effectively. With optimizing the kinetic parameters based on standard SCR reaction, it suggests that a simplified, less accurate model can be effective to evaluate the capability of model based control in the ETC cycle.
A Study on Lateral Tire-road Friction Coefficient Estimation Using Tire Pneumatic Trail Information
Han, Kyoungseok ; Choi, Seibum ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 310~318
DOI : 10.7467/KSAE.2016.24.3.310
The demands for vehicle safety systems such as ABS and ESC have been increased. Accurate vehicle state estimation is required to realized the abovementioned systems and tire-friction coefficient is crucial information. Estimation of lateral tire-road friction coefficient using pneumatic trail information is mainly dealt in this paper. Pneumatic trail shows unique characteristics according to the wheel side slip angle and these property is highly sensitive to vehicle lateral motion. The proposed algorithm minimizes the use of conventional tire models such as magic formula, brushed tire model and Dugoff tire model. The pure side slip maneuver, which means no longitudinal dynamics, is assumed to achieve the ultimate goal of this paper. A simulation verification using Carsim and Simulink is performed and the results show the feasibility of the proposed algorithms.
Development of the Calibration Method for the Boost Pressure and EGR Rate of a WGT Diesel Engine Using Mean Value Model
Chung, Jaewoo ; Kim, Namho ; Lim, Changhyun ; Kim, Deokjin ; Kim, Kiyong ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 319~329
DOI : 10.7467/KSAE.2016.24.3.319
Globally, many researchers have been trying to improve the fuel economy of a vehicle for satisfying future
regulation and minimizing air pollution problem. For the same background, diesel engine and vehicle system optimization using simulation models have been key technologies for the improvement of vehicle system efficiency. Therefore, in this study, calibration method for the air breathing system of a WGT diesel engine using mean value model has been composed for efficient engine and vehicle optimization simulation researches. And virtual WGT performances have been calculated for a 2 cylinder downsized diesel engine system. From these researches, the calibration method for the boost pressure and EGR rate of a virtual diesel engine related with WGT performances could be composed and some of technical issue related with downsized diesel engine could be investigated.
Component Sizing for Development of Novel PHEV System
Lee, Heeyun ; Kang, Changbeom ; Kim, Jinseong ; Cha, Suk Won ; Park, Yeong-il ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 330~337
DOI : 10.7467/KSAE.2016.24.3.330
In this paper, component sizing and analysis of the novel plug-in hybrid electric vehicle powertrain configuration is conducted. Newly proposed powertrain configuration in prior study has an internal combustion engine and two electric motors. To optimize component size of the vehicle system and reduction gear ratio, component sizing methodology is proposed and conducted. Required power for vehicle's dynamic performance is calculated to decide minimum power requirement of powertrain component combination. Component size of engine and electric motor are optimized using vehicle simulation to maximize fuel economy performance. Optimized powertrain configuration and vehicle simulation results present validation of newly proposed vehicle system.
An Analytical Study by Variation of Die and Plug Angle in Drawing Process for the Strength Optimization of Ultra High Pressure Common Rail Fuel Injection Tube Raw Material
Ahn, Seoyeon ; Park, Jungkwon ; Kim, Yonggyeom ; Won, Jongphil ; Kim, Hyunsoo ; Kang, Insan ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 338~344
DOI : 10.7467/KSAE.2016.24.3.338
The study is actively being performed to increase fuel injection pressure of common rail system among countermeasures to meet the emission regulation strengthen of the Diesel engine. The common rail fuel injection tube in such ultra high pressure common rail system has the weakest structural characteristics against vibration that is generated by fuel injection pressure and pulsation during engine operation and driving. Thus the extreme durability is required for common rail fuel injection tube, and the drawing process is being magnified as the most important technical fact for strength of seamless pipe that is the raw material of common rail tube. In this respect, we analyzed the characteristic of dimension and stress variation of the ultra high pressure common rail fuel injection tube by variation of Die and Plug angle in drawing process. Based on the analysis, we tried to obtain the raw material strength of common rail fuel injection tube for applying to the ultra high pressure common rail system. As a result, Plug angle is more important than entry angle of Die and we could obtain the target dimension and strength of the ultra high pressure common rail fuel injection tube through optimization of Plug angle.
Determination of an LNT Regeneration Condition Based on a NO
Storage Fraction in a 2.2L Direct Injection Diesel Engine
Chun, Bongsu ; Lee, Jungwoo ; Han, Manbae ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 345~351
DOI : 10.7467/KSAE.2016.24.3.345
This study was carried out to determine an optimal lean
trap (LNT) regeneration condition based on a
storage fraction. The LNT regeneration was performed by an in-cylinder post fuel injection method. A
storage fraction is defined by the ratio of current cumulated
amount in the LNT to the
storage capacity: 0 means empty and 1 fully loaded. In this study five engine operating conditions were chosen to represent the New European Driving Cycle. With various
storage fractions each engine operating condition, the LNT regeneration was executed and then
conversion efficiency, additional fuel consumption, CO and THC slip, peak catalyst temperature were measured. The results showed that there exist an optimal condition to regenerate the LNT, eg. 1500 rpm 6 bar BMEP with below 0.7
storage fraction in this experimental constraint.
A Study on the Safety Performance of the Air Chamber TMA through Accident Analysis
Jo, Huichang ; Park, Insong ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 352~357
DOI : 10.7467/KSAE.2016.24.3.352
More recently, workers and passengers of casualties has increased by rear-end collisions of unexpected while working on the road. Recently attracted air chamber TMA mounting car accidents which occurred in 3 years, and analyzed the effect of reducing the shock absorption and protection performance and casualties. There is a risk of the vehicle AIS4 more injury of high five accidents of casualties risk, also, was the analysis that there is risk of death was avoided by the air chamber TMA and SGT. Therefore, by mounting the TMA in the rear-end accident, so you can reduce the death and casualties, it must be increased this of attach rate for road construction vehicle.
A Study on the Combustion and Exhaust Emission Characteristics with the Variations of Mixing and Air-fuel Ratio of Bio-ethanol - Gasoline in a SI Engine
Yoon, Seunghyun ; Ha, Sungyong ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 358~364
DOI : 10.7467/KSAE.2016.24.3.358
The combustion and exhaust emission characteristics in a spark ignition (SI) engine with various test fuels (bioethanol - gasoline blends) and air-fuel ratio were investigated in this research. To investigate the influence of the excess air ratio and ethanol blends on the combustion characteristics such as the cylinder pressure, rate of heat release (ROHR), and fuel consumption rate were analyzed. In addition, the reduction effects of exhaust emissions such as carbon monoxide (CO), unburned hydrocarbon (HC), and oxides of nitrogen (NOx) were compared with those of neat gasoline fuel under the various excess-air ratios. The results showed that the peak combustion pressures and the ROHR of bioethanol fuel cases were slightly higher than those of gasoline fuel at all test ranges and fuel ratio. As compared with gasoline fuel (G100) at each given excess air ratio, BSFC of bio-ethanol was increased. The CO, HC, NOx emissions of bio-ethanol blends were lower than those of gasoline fuel under overall experimental conditions.
Development of Clamping Force Estimation Algorithm and Clamp-force Sensor Calibration on Electromechanical Brake Systems
Park, Giseo ; Choi, Seibum ; Hyun, Dongyoon ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 365~371
DOI : 10.7467/KSAE.2016.24.3.365
The electromechanical brake (EMB) is one of future brake systems due to its many advantages. For implementation of the EMB, the correct feed back about clamping force is necessary. Keeping commercialization of the EMB in mind, it is strongly demanded that an expensive load cell measuring the clamping force is replaced with an estimation algorithm. In addition, an estimation of the kissing point where the brake pads start to come into contact with a disk wheel is proposed in this paper. With these estimation algorithms, the clamping force can be expressed as a polynomial characteristic curve versus the motor angle. Also, a method for calibration of measured values by the load cell is proposed and used for an actual characteristic curve. Lastly, the performance of the proposed algorithms is evaluated in comparison with the actual curve on a developed EMB test bench.
A Study on the Speed-based Active Compensation of the Kiss-Point of Dry-type Clutch Equipped with Automated Manual Transmission
Choi, Woo-Seok ; Lee, Kyo-Bum ; Lim, Wonsik ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 3, 2016, Pages 372~378
DOI : 10.7467/KSAE.2016.24.3.372
Clutch torque control is the key to the ride comfort improvement of a vehicle equipped with AMT (automated manual transmission). For such control, the torque transfer starting point, known as the "kiss point," should be indicated or at least estimated to compensate for the clutch torque. The kiss point changes due to wear, high temperature, and fatigue; as such, it should be estimated while the vehicle is being driven. In this study, the method of kiss point active estimation for an AMT vehicle with a dry-type clutch was devised. The kiss point is learned while the engine is in an idle state and while the transmission is at a neutral gear position. It is determined when the input shaft of the transmission starts to rotate by slowly engaging the clutch. The noise of the shaft speed signal during the slow engagement process is filtered for accurate control. The kiss point estimation at various clutch engagement speeds was analyzed via a vehicle test.