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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Automotive Engineers
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Journal DOI :
The Korean Society of Automotive Engineers
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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
Design Optimization of an Automotive Vent Valve Using Kriging Models
Park, Chang-Hyun ; Lee, Young-Mi ; Choi, Dong-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 1~9
In this study, the specifications of the components of the vent vale were optimally determined in order to enhance the performance of the vent valve. Design objective was to minimize fuel leakage while satisfying the design constraints on the performance indices. To obtain the optimum solution based on real experiments, several design techniques available in PIAnO, a commercial PIDO tool, were used. First, an orthogonal array was used to generate training design points and then real experiments were performed to measure the experimental data at the training design points. Next, Kriging metamodels for the objective function and design constraints were generated using the experimental data. Finally, a genetic algorithm was employed to obtain the optimization results using the Kriging models. Fuel leakage of the optimized vent valve was found to be reduced by 95.8% compared to that of the initial one while satisfying all the design constraints.
An Experimental Study on Filtration Efficiency and BPT Characteristics by Soot Loading in Partial-diesel Particulate Filter
Kim, Tae-Kwon ; Kim, Young-Jo ; Ha, Ji-Soo ; Lee, Chun-Beom ; Oh, Kwang-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 10~16
Diesel particulate filter is being recognized that it is the most effective technologies to reduce particulate matter. In this study, to determine the characteristics of the cell-open-type pDPF, we employed p-DPF to exhaust gas tunnel of diesel engine and surveyed filtration efficiency and BPT on the basis of PM which is exhausted from engine. In this paper the soot loading mass in DPF can be predicted from increase of differential pressure of DPF so that we can measure filtration efficiency and Balance Point Temperature (BPT) by soot loading mass. The result of the research showed that the filtration efficiency is 65% in ESC mode with 0.7mm hole diameter. For the results of the characteristics of filtration efficiency and BPT according to mass_exh, we found that if mass_exh increases, filtration efficiency increases and BPT decreases.
The Effect of Cetane Number on Exhaust Emissions in Low-temperature Diesel Combustion
Han, Man-Bae ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 17~22
This study is to investigate the effect of the cetane number in ultra low sulfur diesel fuel on combustion characteristics and exhaust emissions at 1500 rpm and 2.6bar BMEP in low-temperature diesel combustion with 1.9L common rail direct injection diesel engine. Low-temperature diesel combustion was achieved by adopting external high EGR rate with the strategic injection control without modification of engine components. Test fuels are ultra low sulfur diesel fuel (sulfur less than 12 ppm) with two cetane numbers (CN), i.e., CN30 and CN55. For the CN30 fuel, as a start of injection (SOI) timing is retarded, the duration of an ignition delay was decreased while still longer than
for all the SOI timings. In the meanwhile, the CN55 fuel showed that an ignition delay was monotonically extended as an SOI timing is retarded but much shorter than that of the CN30 fuel. The duration of combustion for both fuels was increased as an SOI timing is retarded. For the SOI timing for the minimum BSFC, the CN30 produced nearly zero PM much less than the CN55, while keeping the level of NOx and the fuel consumption similar to the CN55 fuel. However, the CN30 produced more THC and CO than the CN55 fuel, which may come from the longer ignition delay of CN30 to make fuel and air over-mixed.
Effects on Vehicle Handling Performance according to Camber Angle Change of Front and Rear Wheel
Park, Seong-Jun ; Sohn, Jeong-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 23~29
In this study, a camber angle generating mechanism for front and rear suspension is suggested. An experimental device is implemented and tested. A full vehicle model with camber angle generating device by using ADAMS/Car is modeled. Step steer simulations are carried out for investigating the effects of vehicle handling performance due to camber angle change of front and rear wheel. According to results, the camber angle of rear suspension affects the vehicle handling performance during both simulations. Therefore, when the vehicle makes the right turn or left turn, left and right wheel of front and rear suspension should have the proper orientation for improving the handling performance, respectively.
Worst-case Development and Evaluation for Vehicle Dynamics Controller in UCC HILS
Kim, Jin-Yong ; Jung, Do-Hyun ; Jeong, Chang-Hyun ; Choi, Hyung-Jeen ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 30~36
The current test methods are insufficient to evaluate and ensure the safety and reliability of vehicle system for all possible dynamic situation including the worst case such as rollover, spin-out and so on. Although the known NHTSA Sine with dwell steering maneuvers are applied for the vehicle performance assessment, they aren't enough to estimate other possible worst case scenarios. Therefore, it is crucial for us to verify the various worst cases including the existing severe steering maneuvers. This paper includes useful worst case based upon the existing worst case scenarios mentioned above and worst case evaluation for vehicle dynamic controller in simulation basis and UCC HILS. The only human steering angle is selected as a design parameter here and optimized to maximize the index function to be expressed in terms of both yaw rate and side slip angle. The obtained scenarios were enough to generate the worst case to meet NHTSA worst case definition. It has been concluded that the new procedure in this paper is adequate to create other feasible worst case scenarios for a vehicle dynamic control system.
Implementation of Node Mapping-based FlexRay-CAN Gateway for In-vehicle Networking System
Bae, Yong-Gyung ; Kim, Man-Ho ; Lee, Suk ; Lee, Kyung-Chang ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 37~45
As vehicles become more intelligent, in-vehicle networking (IVN) systems such as controller area network (CAN) or FlexRay are essential for convenience and safety of drivers. To expand the applicability of IVN systems, attention is currently being focused on the communication between heterogeneous networks such as body networking and chassis networking systems. A gateway based on message mapping method was developed to interconnect FlexRay and CAN networks. However, this type of gateways has the following shortcomings. First, when a message ID was changed, the gateway must be reloaded with a new mapping table reflecting the change. Second, if the number of messages to be transferred between two networks increase, software complexity of gateway increases very rapidly. In order to overcome these disadvantages, this paper presents FlexRay-CAN gateway based on node mapping method. More specifically, this paper presents a node mapping based FlexRay-CAN gateway operation algorithm along with the experimental evaluation for ID change.
A Numerical Study on Combustion Characteristics of HCCI Engine with Stratification Condition of EGR Exhaust Gases
Lee, Won-Jun ; Lee, Seung-Ro ; Lee, Chang-Eon ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 46~52
Homogeneous charge compression ignition (HCCI) is the best concept able to provide low NOx and PM in diesel engine emissions. This new alternative combustion process is mainly controlled by chemical kinetics in comparison with the conventional combustion in internal combustion engine. However, HCCI engine's operation have an excessive rate of pressure rising during the combustion process. In this study, stratification condition of EGR exhaust gases was used to reduce the pressure rising during the combustion process in HCCI engine. Also, combustion characteristics and emissions characteristics were investigated using the detailed diesel surrogate reaction mechanism.
Effects of Warm-up Performance on SI Engine with Exhaust Heat Recovery System
Park, Kyoun-Suk ; Suh, Ho-Cheol ; Park, Sun-Hong ; Kim, In-Tae ; Jang, Sung-Wook ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 53~60
The effect of exhaust heat recovery system can be evaluated by two well known method. First method is to measure the time duration from engine start under cold coolant temperature till coolant get warmed. By this methodology coolant warming duration can be index of warm-up effect. Second method is to analyze heat balance of the engine during warm-up phase under steady engine operation so that wasted energy by losses such as cooling and exhaust can be index of warm-up effect. This study focused on evaluation of warming-up effect by both methodology above mentioned using 2L SI engine under from idle to 2000rpm steady condition. Results, idle operation showed low heat recovery efficiency but under higher engine speed condition, remarkable heat recovery efficiency improvement was observed. In 2000rpm steady condition, warm-up duration of engine is decreased by exhaust heat recovery system.
Studies on the Performance Evaluation of Downsized High-efficiency Cooling Module
Jung, Jung-Hun ; Shin, Yoon-Hyuk ; Park, Sung-Wook ; Jeong, Sun-An ; Kim, Sung-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 61~67
The cooling module needs enough space (or distance) from hood to absorb the energy from any pedestrian collision. Downsized cooling module for pedestrian protection is important to reduce the severity of pedestrian injury. When a vehicle collision happens, the downsized cooling module is required to reduce the risk of injury to the upper legs of adults and the heads of children. In this study, the performance of cooling module to cool the engine was investigated under 25% height reduction. The heat dissipation and pressure drop characteristics have been experimentally studied with the variation of coolant flow rate, air inlet velocity and A/C operation ON/OFF for the downsized cooling module. The results indicated that the cooling performance was about 94% level compared to that of the conventional cooling module. Therefore, we checked that the cooling module had good performance, and expected that the cooling module could meet the same cooling performance as conventional cooling module through optimization of components efficiency.
Fuel Economy Improvement Cruise Control Algorithm using Distance and Altitude Data of GPS in Expressway
Choi, Seong-Cheol ; Lee, Jong-Hwa ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 68~75
A vehicle fuel economy is very important issue in view of fuel cost and environmental regulation. It has been improved according to the performance improvement of the vehicle engine, power train and many components. It was evaluated at given mode (LA-4, FTP-75, etc) on an engine dynamometer or computer simulation program. In this paper, the fuel economy improvement cruise control algorithms as controling a vehicle velocity by road load calculated and predicted in a real expressway with gradient was studied. Firstly, the altitude and distance data which was measured with GPS sensor was already installed in the ECU of a vehicle. Then the vehicle equipped with GPS receiver is driven the same expressway. The ECU calculates the gradient angle and the in-/decreasing velocity using the gradient angle by comparing the current received distance and altitude data from GPS with the saved data ahead of the vehicle. Therefore the ECU can calculate and predict the vehicle velocity considering tolerance velocity of next position with running. Then the ECU controls the vehicle velocity to meet this predicted velocity in all section. Three cruise control algorithms with the different velocity profiles for the improvement of fuel economy are proposed and compared with the computer simulation results that the vehicle runs on Youngdong expressway. The proposed CVELCONT2 and CVELCONT3 algorithms were improved 3.7% and 4.8% of fuel economy compared with CONSTVEL which is steady cruising algorithm. These two algorithms are recommended as the Eco-cruise drive methodologies in this paper.
Analysis of Electro-magnetic Interference Noise for Eco-friendly Vehicle
Kim, Hae-Sung ; Yong, Boo-Joong ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 76~81
Fossil fuel, the energy source of internal combustion engine automobiles, is limited in resource and has caused environmental issues for decades. Accordingly, automobile manufacturers from many countries around the world are developing or producing eco-friendly vehicles that utilize alternative sources of energy. These vehicles are equipped with many electronic and electrical components which operate on high voltage and/or large current that were not used in conventional combustion engine automobiles. In this paper, in order to analyze the electro-magnetic interference noise, electric vehicles and fuel cell electric vehicles are tested under the guidelines of KMVSS (Korean Motor Vehicle Safety Standards) as well as under test modes that are not stipulated under the guidelines.
A Study on the Ultra Lean Combustion Characteristics of the BMW N53 GDI Engine
Kim, Hong-Suk ; Oh, Jin-Woo ; Kim, Sung-Dea ; Park, Chul-Wong ; Lee, Seok-Whan ; Jeong, Young-Il ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 82~89
Ultra lean combustion with stratified air-fuel mixture is one of the methods that can improve fuel economy of gasoline engines. The aim of this study is to show that how much fuel economy is improved and what are differences in engine control of the ultra lean combustion compared with stoichiometric combustion. In this study, the BMW N53 GDI engine, which is one of ultra lean combustion GDI engines introduced in the market recently, was tested at various engine operating conditions. Results indicated that fuel consumption rates were improved by 11.9~25.8% by the ultra lean combustion compared with stoichiometric combustion. It was also found that multiple fuel injection, multiple spark, early intake valve opening, and large vlave overlap duration were the features of the ultra lean combustion for combustion stability and emission improvement.
A Study on the Fracture Mode Characteristics of Automotive Application Component Lead-free Solder Joints
Jeon, Yu-Jae ; Kim, Do-Seok ; Shin, Young-Eui ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 90~96
In this study, the characteristic of fractured portion and shape on solder joints were investigated according to the thermal shock test for Automotive Application Component using Sn-3.0Ag-0.5Cu solder, which has a outstanding property as Lead-free solder. The value of pull and shear strength was decreased in principle after 432 cycles thermal shock test. In addition, fracture mode was verified by using EDS and SEM to observe fractured shape on the solder joints before and after thermal shock. In before thermal shock test, the fracture mode revealed typically solder layer's fracture mode. In after thermal shock test, we identified multiple fracture mode of the ductile and brittle fracture. Even though same composition of solder was used to experimental for estimating. the fracture mode varied on the fracture portion's height and the directional angles of shear strength. In conclusion, we identified that mechanical strength was affected on the solder layer's fracture mode.
A Study on the Fuel Economy Prediction Method Based on Vehicle Power Analysis of PRIUS III
Chung, Jae-Woo ; Seo, Young-Ho ; Choi, Yong-Jun ; Choi, Sung-Eun ; Kim, Hyoung-Gu ; Jung, Ki-Yun ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 97~106
Both an optimal design of the engine operating strategy and fuel economy prediction technique for a HEV under the vehicle driving condition are very crucial for the development of vehicle fuel economy performance. Thus, in this study, engine operating characteristics of PRIUS III were analyzed with vehicle running conditions and the correlations between vehicle tractive power and fuel consumption were introduced. As a result, fuel economy performance of PRIUS III with various test modes were predicted and verified. Errors of predicted fuel economy were between -5% and -1%.
A Study of Fuel Pump Durability on the Bio-ethanol for FFV(Flexible Fuel Vehicle) System
Kim, Chang-Soo ; Kwak, Dong-Ho ; Jung, Byung-Jun ; Kim, Jong-Myung ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 107~112
FFV(Flexible Fuel Vehicle) is the vehicle that can be used liberally from gasoline to E100(Ethanol 100%) for fuel. Recently, interest in the bio-fuel is increased by the environmental factors like exhaustion of the fossil fuel and ruduction of greenhouse gases. For the reason, adopting of FFV is activated in the world including North and South America. In general, bio-ethanol has highly corrosive substance in compare with gasoline. In the part of fuel system, corrosion can make a safety problem in case of fuel leakage and engine starting problem. So the fuel system of FFV have to be made of high corrosion-resistant materials. This study examined the effect of bio-ethanol on the durability properties according to component materials in FFV fuel pump motor and regulator using the High Temperature Fuel Circulation Test.
Sizing of Powertrain in Fuel Cell Hybrid Vehicles
Zheng, Chun-Hua ; Shin, Chang-Woo ; Park, Yeong-Il ; Cha, Suk-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 113~118
Fuel Cell Hybrid Vehicle (FCHV) is one of the most promising candidates for the next generation of transportation. It has many outstanding advantages such as higher energy efficiency and much lower emissions than internal combustion engine vehicles. It also has the ability of recovering braking energy. In order to design an FCHV drive train, we need to determine the size of the electric motor, the Fuel Cell System (FCS), and the battery. In this paper, the methodology for the sizing of these components is introduced based on the driveability constraints of the FCHV. A power management strategy is also presented because the battery energy capacity depends on it. The warm-up time of the FCS is also considered in the power management strategy and the simulation result is compared to that without considering the warm-up time.
Analytical Study of Cooling Performance Comparison in a Refrigerator Truck Using R404A and R744
Myung, Chi-Wook ; Kim, Sang-Hun ; Cho, Hong-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 119~125
The analysis of performance characteristics in a refrigerator truck using R404A and R744 was carried out by using theoretical method, and each performance was compared with a variation of operating conditions. The components and cycle simulation model were developed by using EES program. To investigate the performance characteristics with operating conditions, the performance of both systems was simulated according to indoor temperature, outdoor temperature, outdoor air velocity and compressor speed. As a result, the R744 system had a better COP than R404A system for given operating condition. The cooling capacity was not increased over the outdoor air velocity of 3 m/s. Besides, the performance of R404A system was more sensitive to operating conditions compared to that of R744 system.
Thermal Structural Analysis of the Engine Turbocharger under the Transient Temperature History Corresponding to the Motoring Fatigue Test
Choi, Bok-Lok ; Bang, In-Wan ; Chang, Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 126~132
Fatigue cracks of the turbocharger are often observed for high performance engines under thermal shock tests. Maximum exhaust gas temperature of recently developed gasoline engines could reach approximately
. It's very important to estimate transient temperature histories during thermal shock cycles to predict the stress and the fatigue life of the turbocharger. With these temperature profiles, temperature-dependent material properties and boundary conditions, we could identify critical locations by the application of finite element simulation technologies. In this paper, we applied the reliable analysis approach to the actual turbocharger to predict the weak locations due to the repetitions of plastic strains and compared the results with the crack locations under physical engine test.
Robust Design Study of Engine Cylinder Head
Yang, Chull-Ho ; Han, Moon-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 133~139
Maintaining adequate sealing in engine cylinder head is a crucial factor in engine design. Failure of engine operations occurs mainly owing to the leaking by decreased sealing pressure. Reliability-robustness concept is applied to the engine cylinder head system. Deterministic way to obtain engineering solution in CAE industry may not consider the effects of noises and disturbances experienced during operation. However, analytical reliability-robustness concept may make possible to reduce the sensitivity of system with noise factors. Influences of design factors including noise factors would be predicted in analytical way. Optimized design may be obtained by shrinking variability and shifting to design target. Three-dimensional finite element analyses have been performed to apply analytical reliability-robustness concept.
Analysis of Hydraulic Characteristics of Two Solenoid-driven Injectors for CRDi System
Lee, Jin-Wook ; Lee, Jung-Hyup ; Kim, Min-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 6, 2011, Pages 140~147
The injection nozzle of an electro-hydraulic injector for the common rail Diesel fuel injection system is being opened and closed by movement of a injector's needle which is balanced by pressure at the nozzle seat and at the needle control chamber, at the opposite end of the needle. In this study, the slenoid actuator was considered as a prime movers in high pressure Diesel injector. Namely a solenoid-driven Diesel injector with different driving current types, as a general method driven by solenoid coil energy, has been applied with a purpose to develop the analysis model of the solenoid actuator to predict the dynamics characteristics of the hydraulic component (injector) by using the AMESim code. Aimed at simulating the hydraulic behavior of the solenoid-driven injector, the circuit model has been developed as a unified approach to mechanical modeling in this study. As this analytic results, we know the suction force and first order time lag for driving force can be endowed in solenoid-driven injector in controlling the injection rate. Also it can predict that the input current wave exerted on solenoid coil is the dominant factor which affects on the initial needle behavior of solenoid-driven injector than the hydraulic force generated by the constant injection pressure.