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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
Editor in Chief :
Volume & Issues
Volume 20, Issue 6 - Nov 2012
Volume 20, Issue 5 - Sep 2012
Volume 20, Issue 4 - Jul 2012
Volume 20, Issue 3 - May 2012
Volume 20, Issue 2 - Mar 2012
Volume 20, Issue 1 - Jan 2012
Selecting the target year
Multidisciplinary Design Optimization of Vehicle Front Suspension System Using PIDO Technology
Lee, Gab-Seong ; Park, Jung-Min ; Choi, Byung-Lyul ; Choi, Dong-Hoon ; Nam, Chan-Hyuk ; Kim, Gi-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 1~8
DOI : 10.7467/KSAE.2012.20.6.001
Multidisciplinary design optimization (MDO) for a suspension component of the vehicle front suspension was performed in this research. Shapes and thicknesses of the subframe were optimized to satisfy multi-disciplinary design requirements; weight, fatigue, crash, noise, vibration, and harshness (NVH), and kinematic and compliance (K&C). Analyses procedures of the performance disciplines were integrated and automated by using the process integration and design optimization (PIDO) technique, and the integrated and automated analyses environments enabled various types of analytic design methodologies for solving the MDO problem. We applied an approximate optimization technique which involves sequential sampling and metamodeling. Since the design variables for thicknesses should be dealt as discrete variables. the evolutionary algorithm is selected as optimization technique. The MDO problem was formulated three types of problems according to the order of priorities among the performance disciplines, and the results of MDO provided design alternatives for various design situations.
A Study on Case Analysis of Motor Vehicle Fires Which Occurred in Operation but Were Found after Parking
Lee, Eui-Pyeong ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 9~16
DOI : 10.7467/KSAE.2012.20.6.009
It is often thought that when a fire is found in parked motor vehicles, the fire may occur after an engine stops. Also, it is easy to judge that when motor vehicle fires occur during engine stopping, it may be caused by arson or electrical causes irrespective of a fuel system. This study analyzed motor vehicle fires which occurred in operation but were found after parking and revealed that these fires were caused by the defect of a fuel system and the same motor vehicle types had fires by the same causes. Moreover, this study provided judgement process of major fire causes and periods for fire investigators to apply when investigating fires of parked motor vehicles. And this fire is related to automotive products liability.
Development of an Integrated Control System between Active Front Wheel System and Active Rear Brake System
Song, Jeong-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 17~23
DOI : 10.7467/KSAE.2012.20.6.017
An integrated dynamic control (IDCF) with an active front steering system and an active rear braking system is proposed and developed in this study. A fuzzy logic controller is applied to calculate the desired additional steering angle and desired slip of the rear inner wheel. To validate IDCF system, an eight degree of freedom, nonlinear vehicle model and a sliding mode wheel slip controller are also designed. Various road conditions are used to test the performance. The results show that the yaw rate of IDCF vehicle followed the reference yaw rate and reduced the body slip angle, compared with uncontrolled vehicle. Thus, the IDCF vehicle had enhanced lateral stability and controllability.
Properties of Roadway Particles from the Interaction between Tire and Road Pavement
Lee, Seok-Hwan ; Kim, Hong-Seok ; Park, Jun-Hyuk ; Woo, Se-Jong ; Kwak, Ji-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 24~32
DOI : 10.7467/KSAE.2012.20.6.024
A large fraction of urban
concentrations is due to non-exhaust traffic emissions including road dust, tire wear particles, and brake lining particles. Although potential health and environmental impacts associated with tire wear debris have been increased, few environmentally and biologically relevant studies of actual tire wear debris have been conducted. Tire wear particles (TWP) are released from the tire tread as a result of the interaction between the tire and the pavement. Roadway particles (RP), meanwhile, are particles on roads composed of a mixture of elements from tires, pavements, fuels, brakes, and environmental dust. The main objective of present study is to identify the contribution of tires to the generation of RP and to assess the potential environmental and health impacts of this contribution. First, a mobile measurement system was constructed and used to measure the roadway particles on asphalt road according to vehicle speed. The equipment of the mobile system provides
concentrations by Dusttrak DRX and number density & size distribution measurements of fine and ultra-fine particles by a fast mobility particle sizer (FMPS) and an aerosol particle sizer (APS). When traveling on an asphalt road at constant speed, there is a clear tendency for PM10 concentration to increase slightly in accordance with an increase in the vehicle speed. It was also found that considerable brake wear particles and particles from tire/road interface were generated by rapid deceleration of the vehicle. The morphology and elements of the roadway particles were also analyzed using SEM-EDX technique.
Modeling of EMB (Electro Mechanical Brake) to Emulate Gearbox Fault and Control
Choe, Byung-Do ; Hwang, Woo-Hyun ; Huh, Kun-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 33~38
DOI : 10.7467/KSAE.2012.20.6.033
EMB is considered as the next generation braking mechanism because it has simple structure and is environment friendly. However, as other brake mechanisms, EMB should be operated reliably for any operating conditions. EMB should be designed with fail-safe and fault-tolerant control concepts which require robust fault detection algorithms for various possible faults. In the design of fault detection algorithms, it is very difficult to construct faulty conditions in real EMB and thus, simulations are often used to emulate the faulty conditions. In this paper, a simulation tool is developed using the commercial software to emulate gear faults in the EMB mechanism. A backlash compensation algorithm is introduced based on contact point detection because screw backlash causes a delay in clamping force response time.
LDWS Performance Study Based on the Vehicle Type
Park, Hwan-Seo ; Lee, Hong-Guk ; Chang, Kyung-Jin ; Yoo, Song-Min ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 39~45
DOI : 10.7467/KSAE.2012.20.6.039
More than 80 percent of traffic accidents related with lane departure believed to be the result of crossing the lane due to either negligence or drowsiness of the driver. Lane-departure related accident in the highway usually involve high fatality. Even though LDWS is believed to prevent accident 25% and reduce fatalities by 15% respectively, its effectiveness in performance is yet to be confirmed in many aspects. In this study, the vehicle lateral locations relative to warning zone envelop (earliest and latest warning zone) defined in ISO standard, ECE and NHTSA regulations are compared with respect to various factors including delays, vehicle speed and vehicle heading angle with respect to the lane. Since LDWS is designed to be activated at the speed over 60 km/h, vehicle speed range for the study is set to be from 60 to 100 km/h. The vehicle heading angle (yaw angle) is set to be up to 5 degree away from the lane (abrupt lane change) considering standard for lane change test using double lane-change test specification. The TLC is calculated using factors like vehicle speed, yaw angle and reaction time. In addition, the effect of vehicle type has been considered to assess LDWS safety.
Equivalent Consumption Minimization Strategy of Fuel Cell Hybrid Vehicles
Zheng, Chun-Hua ; Park, Yeong-Il ; Lim, Won-Sik ; Cha, Suk-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 46~51
DOI : 10.7467/KSAE.2012.20.6.046
Fuel Cell Hybrid Vehicles (FCHVs) have become a major topic of interest in the automotive industry owing to recent energy supply and environmental problems. Several types of power management strategies have been developed to improve the fuel economy of FCHVs including optimal control strategy based on optimal control theory, rule-based strategy, and equivalent consumption minimization strategy (ECMS). The ECMS is applied in this study. This strategy is based on the heuristic concept that the usage of the electric energy can be exchanged to equivalent fuel consumption. This strategy is known as one of the promising solutions for real-time control of hybrid vehicles. The ECMS for an FCHV is introduced in this paper as well as the equivalent fuel consumption parameter. The relationship between the battery final state of charge (SOC) and the fuel consumption while changing the equivalent fuel consumption parameter is obtained for three different driving cycles. The function of the equivalent fuel consumption parameter is also discussed.
A Study on Feed Rate Characteristics of Integrated Cylinder Lubricator System with an Accumulated Distribution by the Electronic Control in a Large Two-stroke Diesel Engine
Bae, Myung-Whan ; Jung, Hwa ; Bae, Chang-Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 52~60
DOI : 10.7467/KSAE.2012.20.6.052
Minimizing the cylinder wear and the consumption rate of cylinder oil in a large two-stroke diesel engine is of great economic importance. A motor-driven cylinder lubricator for Sulzer RT-flex large two-stroke diesel engines developed by authors is in need of modifying the lubricating system to lubricate cylinder parts optimally by an electronically controlled quill device according to changes of engine load and revolution speed. In order to apply the developed accumulating distributor to an integrated cylinder lubricator by the electronically controlled system as the third research stage, the lubricating system is improved in the electronically controlled quill device with a solenoid valve. In this study, the effects of lubricator revolution speed, driving pressure and cylinder back pressure on oil feed rate, maximum discharge and delivery pressures are experimentally investigated by using the integrated cylinder lubricator system with an accumulated distribution by the electronic control. It is found that the oil feed rate of the developed integral cylinder lubricator system is less than that of the motor-driven cylinder lubricator by the electronically controlled quill system equipped with an accumulating distributor because of the decrease of delivery speed by increasing the maximum delivery pressure in the same experimental condition.
Analysis of Engine Operation Condition by Using Coastdown Test under Gear Engaged Condition
Shim, Beom-Joo ; Park, Kyoung-Suk ; Park, Jun-Su ; Min, Byeong-Du ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 61~66
DOI : 10.7467/KSAE.2012.20.6.061
Conventional method to transform vehicle driving condition to engine operation mode is to use vehicle road load under neutral gear and mechanical efficiency of drivetrain. But this method requires additional measurement of efficiency of drivetrain on a test rig. And this measurement is normally done at fixed speed and thus estimated accuracy of engine operation mode is not considered to be high enough. This study suggests new method to calculate engine operation mode for prescribed driving mode such as NEDC using vehicle coastdown test under gear engaged condition without measurement of mechanical efficiency of drivetrain. Coastdown test was done under neutral and gear engaged condition for comparison and also trial to extract mechanical loss of drivetrain was carried out. Calculated engine torque by conventional and newly suggested method was compared with actually measured torque of a vehicle on a chassis dynamometer during NEDC. Newly suggested method showed slightly higher accuracy of accumulated brake work during NEDC.
Studies on the Cooling Performance of Front End Module for Pedestrian Protection
Shin, Yoon-Hyuk ; Kim, Sung-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 67~72
DOI : 10.7467/KSAE.2012.20.6.067
Novel Front End Module(FEM) with improved pedestrian protection is very important to reduce the severity of pedestrian injury. The FEM needs to have enough space from hood to absorb the energy from any pedestrian collision. In this study, the cooling performance of the FEM to cool the engine was investigated under 25% height reduction. The results indicated that the cooling performance analysis was about 86% level compared to that of the conventional FEM. Also, good qualitative agreement between CFD predictions and experimental measurements was found. This FEM needs the cooling performance enhancement for changed air flow path at the frontal part of vehicle. Therefore, we showed an improved performance using air guide setup and shape modification under the high load condition.
Effect of Water on the Kinetics of Nitric Oxides Reduction by Ammonia over V-based Catalyst
Kim, Young-Deuk ; Jeong, Soo-Jin ; Kim, Woo-Seung ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 73~82
DOI : 10.7467/KSAE.2012.20.6.073
The main and side reactions of the three selective catalytic reduction (SCR) reactions with ammonia over a vanadium-based catalyst have been investigated using synthetic gas mixtures in the temperature range of
. The three SCR reactions are standard SCR with pure NO, fast SCR with an equimolar mixture of NO and
SCR with pure
. Vanadium based catalyst has no significant activity in NO oxidation to
, while it has high activity for
decomposition at high temperatures. The selective catalytic oxidation of ammonia and the formation of nitrous oxide compete with the SCR reactions at the high temperatures. Water strongly inhibits the selective catalytic oxidation of ammonia and the formation of nitrous oxide, thus increasing the selectivity of the SCR reactions. However, the presence of water inhibits the SCR activity, most pronounced at low temperatures. In this study, the experimental results are analyzed by means of a dynamic one-dimensional isothermal heterogeneous plug-flow reactor (PFR) model according to the Eley-Rideal mechanism.
Study on the Development of Control Strategy for Series Hybrid Electric Bus based on HILS
Jung, Dae-Bong ; Kim, Min-Jae ; Kang, Hyung-Mook ; Min, Kyoung-Doug ; Cho, Yong-Rae ; Lee, Chun-Beom ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 83~91
DOI : 10.7467/KSAE.2012.20.6.083
In recent days, the study on hybridization of the heavy-duty is going on, actively. Especially, the improvement of fuel economy can be maximized in the intra-city bus because it drives the fixed route. For developing the hybrid electric intra-city bus, optimized control strategy which is possible to be applied with real vehicle is necessary. If the real-time control strategy is developed based on the HILS, it is possible to verify the real-time ability and fail-safety function which has the vehicle stay in safe state when the functional errors are occurred. In this study, the HILS system of series hybrid electric intra-city bus is developed to verify the real time control strategy and the fail-safety functions. The main objective of the paper is to build the HILS system for verifying the control strategy (rule-based control) which is implemented to reflect the Dynamic Programming results and fail-safety functions.
A Study on Cause Analysis of a Fire that Broke Out on a No-start Motor Vehicle
Lee, Eui-Pyeong ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 92~99
DOI : 10.7467/KSAE.2012.20.6.092
It is often thought that because no-start motor vehicles cannot start an engine, a fire cannot occur for motor vehicle causes. However, although the engine cannot start up, some parts may be live with electricity if a battery is connected. If the parts have problems, a fire can occur. This study analyzed the causes of fires occurring when a motor vehicle was loaded onto a tow truck to service no-start. It is suggested that no-start motor vehicles should separate a battery terminal to prevent a fire. And this fire is related to automotive products liability.
Fatigue Life Prediction for Automotive Vibroisolating Rubber Component Using Tearing Energy
Moon, Hyung-Il ; Kim, Ho ; Woo, Chang-Soo ; Kim, Heon-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 100~106
DOI : 10.7467/KSAE.2012.20.6.100
Recently, the demand to acquire and improve durability performance has steadily risen in rubber components design. In design process of a rubber component, an analytical prediction is the most effective way to improve fatigue life. Existing methods of analytical estimation have mainly used an equation for fatigue life obtained from fatigue test data. However, such formula is rarely used due to costs and time required for fatigue testing, as well as randomness of rubber materials. In this paper, we describe fatigue life estimation of rubber component using only the results from a relatively simple tearing test. We estimated fatigue life of the Janggu type fatigue specimen and the automotive motor mount, and evaluated reliability of the proposed method by comparing the estimated values with actual test results.
Research and Development of a 2.9 Liter Light-duty DME Truck Using Common Rail Fuel Injection Systems
Jeong, Soo-Jin ; Park, Jung-Kwon ; Oh, Se-Doo ; Lee, Gee-Soo ; Lim, Ock-Taek ; Pyo, Young-Dug ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 107~116
DOI : 10.7467/KSAE.2012.20.6.107
In this study, the trucks(2.9-liter) have been developed to use DME as fuel, and performance test of the vehicle`s DME engine, power, emissions, fuel economy and vehicle aspects was conducted. For experiments, the fuel system(common-rail injectors and high-pressure pump included) and the engine control logic was developed, and ECU mapping was performed. As a result, the rail pressure from 40MPa to approximately 65% increase compared to the base injector has been confirmed that. Also, the pump discharge flow is 15.5 kg/h when the fuel rail pressure is 400rpm(40MPa), and the pump discharge flow is 92.1 kg/h when the fuel rail pressure is 2,000rpm(40MPa). The maximum value of full-load torque capability is 25.5 kgfm(based on 2,000 rpm), and more than 90% compared to the level of the diesel engine were obtained. The DME vehicle was developed in this study, 120 km/h can drive to the stable, and calculated in accordance with the carbon-balance method of fuel consumptions is 5.7 km/L.
Application Software Modeling and Integration Methodology using AUTOSAR-ready Light Software Architecture
Park, In-Seok ; Lee, Woo-Taik ; SunWoo, Myoung-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 117~125
DOI : 10.7467/KSAE.2012.20.6.117
This paper describes a model-based software development methodology for AUTOSAR-ready light software architecture(AUTOSAR-Lite). The proposed methodology briefly represents an application software modeling technique using Matlab/Simulink. Using the proposed technique, application software architecture elements (e.g. software components, runnables, and interfaces) and functional behaviors can be designed in a single modeling environment. From the designed model, the codes of application software is automatically generated using Real-Time Workshop Embedded Coder. The generated application software is easily integrated with hand-coded basic software using the proposed method. In order to evaluate the proposed methodology, a diesel engine management system for a passenger car was employed as a case study. Based on the methodology, 8 atomic software components and 52 runnables are successfully developed, and they are evaluated by engine experiments. From this case study, AUTOSAR compatible model-based application software was successfully developed, and the effectiveness of the proposed methodology was evaluated.
Tire Lateral Force Estimation System Using Nonlinear Kalman Filter
Lee, Dong-Hun ; Kim, In-Keun ; Huh, Kun-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 126~131
DOI : 10.7467/KSAE.2012.20.6.126
Tire force is one of important parameters which determine vehicle dynamics. However, it is hard to measure tire force directly through sensors. Not only the sensor is expensive but also installation of sensors on harsh environments is difficult. Therefore, estimation algorithms based on vehicle dynamic models are introduced to estimate the tire forces indirectly. In this paper, an estimation system for estimating lateral force and states is suggested. The state-space equation is constructed based on the 3-DOF bicycle model. Extended Kalman Filter, Unscented Kalman Filter and Ensemble Kalman Filter are used for estimating states on the nonlinear system. Performance of each algorithm is evaluated in terms of RMSE (Root Mean Square Error) and maximum error.
A Study of the Roust Degradation Model by Analyzing the Filament Lamp Degradation Data
Sung, Ki-Woo ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 132~139
DOI : 10.7467/KSAE.2012.20.6.132
It is generally needed to test durability and lifetime when we develop parts in new technology. In this paper, the accelerated degradation analysis methods are developed to test them. This study is presented robust model estimation method that is less affected by outlier in regresstion model estimation. In addition, the lifetime can be predicted by Degradation-stress relationship in stress level.
Corrosion Characteristics Improvement of Aluminium Tube for Diesel Engine Intercooler with LP-EGR(Low Pressure-Exhaust Gas Recirculation)
Ahn, Joon ; Ha, Seok ; Kwak, Dong-Ho ; Jung, Byung-Jun ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 140~145
DOI : 10.7467/KSAE.2012.20.6.140
Recently, various after-treatment systems, such as LP-EGR(Low Pressure-Exhaust Gas Recirculation), SCR(Selective Catalytic Reduction) and LNT(Lean NOx Trap), were developed to obey the stringent emission regulations of diesel engine. There are many researches on LP-EGR system because it has advantages of NOx reduction and low fuel consumption. But, condensation water is generated in internal of intercooler tube and it contains various types of anion that cause the corrosion of aluminium tube. In this study, it is examined that the condensation water effects on corrosion of aluminium tube. And method for improvement of corrosion characteristics is investigated using the dipping and electrochemical test.
Structural Analysis for Bicycle Frame by Type
Han, Moon-Sik ; Cho, Jae-Ung ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 6, 2012, Pages 146~155
DOI : 10.7467/KSAE.2012.20.6.146
This study aims to analyze durability by comparing displacement on vibration at driving bicycle frame models of 1, 2, 3 and 4. Among maximum equivalent stresses at 4 kinds of models, model 1 has highest value with 410.39 MPa and becomes 30 times than model 4 with lowest value. The natural frequency number at Model 4 increases more than the other models. Among four models, the number of frequency at model 1 becomes lowest at harmonic vibration with real loading condition. In cases of four kinds of models, the maximum stress is shown near the assembly of rear wheel and the maximum displacement is shown near saddle assembly at this harmonic condition. The structural result about this study can be effectively utilized on the design of bicycle frame by investigating durability and prevention against its damage.