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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 14, Issue 6 - Nov 2006
Volume 14, Issue 5 - Sep 2006
Volume 14, Issue 4 - Jul 2006
Volume 14, Issue 3 - May 2006
Volume 14, Issue 2 - Mar 2006
Volume 14, Issue 1 - Jan 2006
Selecting the target year
Development of a Fault-Tolerant Steer-By-Wire Control System
Kim, Jae-Suk ; Hwang, Woon-Gi ; Lee, Woon-Sung ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 1~8
The Steer-By-Wire(SBW) system replaces complex mechanical linkages of the current steering system with electric motors, sensors, and electronic control units. However, the SBW system should guarantee its safety and reliability before commercialization, and therefore, a reliable and robust fault-tolerant technology has to be implemented. This paper proposes a fault-tolerant control algorithm for the SBW system. Based on careful analysis on propagation effects of sensor faults, a reliable fault-tolerant control strategy has been developed. The fault-tolerant controller consists of a fault detection part that monitors and detects faults in the steering wheel and road wheel sensors, and a reconfiguration part that switches to normal sensor signal based on fault detection information. It has been demonstrated by simulation that the proposed algorithm detects sensor faults accurately and enables reliable steering control under various dynamic fault situations.
Coupled CFD-FE Analysis Method for IC Engine Cooling Water Jacket under Subcooled Nucleate Boiling Conditions
Lee, Myung-Hoon ; Kim, Dong-Kwang ; Lee, Sang-Kyoo ; Rhim, Dong-Ryul ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 9~16
The present study is to simulate coolant flow in IC engine cooling passages under subcooled nucleate boiling conditions and investigate thermal stress analysis of the solid part. To consider nucleate boiling heat transfer effect, Chen's empirical formula is used through user subroutine programing in CFD code and then nucleate boiling model is compared with Robinson's experimental results, which shows reasonable agreement. This Chen's nucleate boiling model is applied to single cylinder IC engine model and we do cylinder liner thermal stress analysis using commercial FEM code.
An Experimental Study of an Anti-lock Brake System
Kang, Sung-Hwang ; Kim, Jae-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 17~24
Anti-lock brake system(ABS) are designed to prevent wheel lock on all wheels of the vehicle by sensing wheel angular speed, processing the speed sensor signals in suitable digital electronic control circuits and comanding electrohydraulic actuators to control brake pressure. This study considers a control of ABS using wheel circumferential acceleration thresholds which avoids dangerous wheel locking due to excessive brake pressure during the vehicle braking and discusses the 3-channels, 3-sensors ABS system that employs "independent control" technique for the front wheels and "select low" technique for the rear wheels. The validities of the ABS such as vehicle stability, steerability and stopping distance during braking are assured through the vehicle tests on uniform asphalt straight roads.
A Study on the CAI Combustion Characteristics and Stratified Combustion to Extend the Operating Region Using Direct Injection Gasoline Engine
Lee, Chang-Hee ; Choi, Young-Jong ; Lim, Kyoung-Bin ; Lee, Ki-Hyung ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 25~31
Controlled Auto Ignition(CAI) combustion has great potential in achieving significant increase in engine efficiency, while simultaneously reducing exhaust emissions. The process itself involves the auto ignition and subsequent simultaneous combustion of a premixed charge. In this study, NVO(Negative Valve Overlap) system was applied to a CAI engine in order to use residual gas. The fuel was injected directly to the cylinder under the high temperature condition resulting from heating the intake port to initiate CAI combustion. This paper introduced the valve timing strategy and experimental set-up. From this study, the effect of engine speed and valve timing on CAI combustion and exhaust emissions was clarified. In addition, stratified charge method was used to extend CAI operating region.
A Study on the Effect of Compression Ratio and EGR on the Partial Premixed Diesel Compressed Ignition Combustion Engine Applied with the Split Injection Method
Chung, Jae-Woo ; Kang, Jung-Ho ; Lee, Sung-Man ; Kang, Woo ; Kim, Byoung-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 32~38
Currently, due to the serious world-wide air pollution by substances emitted from vehicles, emission control is enforced more firmly and it is expected that the regulation requirements for emission will become more severe. A new concept combustion technology that can reduce the NOx and PM in relation to combustion is urgently required. Due to such social requirement, technologically advanced countries are making efforts to develop an environment-friendly vehicle engine at the nation-wide level in order to respond to the reinforced emission control. As a core combustion technology among new combustion technologies for the next generation engine, the homogenous charge compression ignition(HCCI) is expanding its application range by adopting multiple combustion mode, catalyst, direct fuel injection and partially premixed combustion. This study used a 2-staged injection method in order to apply the HCCI combustion method without significantly altering engine specifications in the aspect of multiple combustion mode and practicality by referring to the results of studies on the HCCI engine. In addition, this study confirmed the possibility of securing optimum fuel economy emission reduction in the IMEP 8bar range(which could not be achieved with existing partially premixed combustion) through forced charging, exhaust gas recirculation(EGR), compression ratio change and application of DOC catalyst.
Evaluation of Mechanical and Electrical Properties of Bipolar Plate Made of Fiber-reinforced Composites for PEM Fuel Cell
Lee, Hee-Sub ; Ahn, Sung-Hoon ; Jeon, Ui-Sik ; Ahn, Sang-Yeoul ; Ahn, Byung-Ki ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 39~46
The fuel cell is one of promising environment-friendly energy sources for the next generation. The bipolar plate is a major component of the PEM fuel cell stack, which takes a large portion of stack cost. In this study, as alternative materials for bipolar plate of PEM fuel cells, graphite composites were fabricated by compression molding. Graphite particles mixed with epoxy resin were used as the main substance to provide electric conductivity To achieve desired electrical properties, specimens made with different mixing ratio, processing pressure and temperature were tested. To increase mechanical strength, one or two layers of woven carbon fabric were added to the graphite and resin composite. Thus, the composite material was consisted of three phases: graphite particles, carbon fabric, and epoxy resin. By increasing mixing ratio of graphite, fabricated pressure and process temperature, the electric conductivity of the composite was improved. The results of tensile test showed that the tensile strength of the two-phase graphite composite was about 4MPa, and that of three-phase composite was increased to 57MPa. As surface properties, contact an91e and surface roughness were tested. Graphite composites showed contact angles higher than
, which mean low surface energy. The average surface roughness of the composite specimens was
Development of Network-based Traction Control System and Study its on Performance Evaluation using Net-HILS
Ryu, Jung-Hwan ; Yoon, Ma-Ru ; Hwang, In-Yong ; SunWoo, Myoung-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 47~57
This paper presents a network-based traction control system(TCS), where several electric control units (ECUs) are connected by a controller area network(CAN) communication system. The control system consists of four ECUs: the electricthrottle controller, the transmission controller, the engine controller and the traction controller. In order to validate the traction control algorithm of the network-based TCS and evaluate its performance, a Hardware-In-the-Loop Simulation(HILS) environment was developed. Herein we propose a new concept of the HILS environment called the network-based HILS(Net-HILS) for the development and validation of network-based control systems which include smart sensors or actuators. In this study, we report that we have designed a network-based TCS, validated its algorithm and evaluated its performance using Net-HILS.
Effect of EGR and Supercharging on the Diesel HCCI Combustion
Park, Se-Ik ; Kook, Sang-Hoon ; Bae, Choong-Sik ; Kim, Jang-Heon ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 58~64
Homogeneous charge compression ignition(HCCI) combustion is an advanced technique for reducing the hazardous nitrogen oxide(NOx) and particulate matter(PM) in a diesel engine. NOx could be reduced by achieving lean homogeneous mixture resulting in combustion temperature. PM could be also reduced by eliminating fuel-rich zones which exist in conventional diesel combustion. However previous researches have reported that power-output of HCCI engine is limited by the high intensive knock and misfiring. In an attempt to extend the upper load limit for HCCI operation, supercharging in combination with Exhaust Gas Recirculation(EGR) has been applied: supercharging to increase the power density and EGR to control the combustion phase. The test was performed in a single cylinder engine operated at 1200 rpm. Boost pressures of 1.1 and 1.2 bar were applied. High EGR rates up to 45% were supplied. Most of fuel was injected at early timing to make homogeneous mixture. Small amount of fuel injection was followed near TDC to assist ignition. Results showed increasing boost pressure resulted in much higher power-output. Optimal EGR rate influenced by longer ignition delay and charge dilution simultaneously was observed.
Measurements and Numerical Analysis of Electric Cart and Fuel Cell to Estimate Operating Characteristic of FCEV
Cho, Yong-Seok ; Kim, Duk-Sang ; An, Seok-Jong ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 65~72
In new generation vehicle technologies, a fuel cell vehicle becomes more important, by virtue of their emission merits. In addition, a fuel cell is considered as a major source to generate the electricity for vehicles in near future. This paper focuses on modeling of not only an electric vehicle and but also a fuel cell vehicle to estimate performances. And an EV cart is manufactured to verify the modeling. Speed, voltage, and current of the vehicle and modeling are compared to estimate them at acceleration test and driving mode test. The estimations are also compared with the data of the Ballard Nexa fuel cell stack. In order to investigate a fuel cell based vehicle, motor and fuel cell models are integrated in a electric vehicle model. The characteristics of individual components are also integrated. Calculated fuel cell equations show good agreements with test results. In the fuel cell vehicle simulation, maximum speed and hydrogen fuel consumption are estimated. Even though there is no experimental data from vehicle tests, the vehicle simulation showed physically-acceptable vehicle characteristics.
A Study on the Creep Deformation Behavior of Mg-Zn-Mn-(Ca) Alloys
Kang, Dae-Min ; Koo, Yang ; Sim, Sung-Bo ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 73~78
In this paper, creep tests of Mg-Zn-Mn and Mg-Zn-Mn-Ca alloys, which were casted by mold with Mg-3%Zn-1%Mn and Mg-3%Zn-1%Mn-0.2%Ca, were done under the temperature range of 473-573K and the stress range of 23.42-78.00Mpa. The activation energies and the stress exponents were measured to investigate the creep plastic deformation of those alloys, and the rupture lifes of Mg-Zn-Mn alloy were also measured to investigate the fracture behavior. From the results, the activation energy of Mg-Zn-Mn and Mg-Zn-Mn-Ca alloys under the temperature range of 473-493K were measured as 149.87, 145.98KJ/mol, respectively, and the stress exponent were measured as 5.13, 6.06 respectively. Also the activation energies Mg-Zn-Mn and Mg-Zn-Mn-Ca alloys under the temperature range of 553-573K were obtained as 134.41, 129.22KJ/mol, respectively, and tress exponent were obtained as 3.48, 4.63, respectively. Finally stress dependence of rupture life and the activation energy of rupture life of Mg-Zn-Mn under the temperature range of 473-493K was measured as 8.05, 170.0(KJ/mol), respectively, which were a little higher than the results of steady state creep.
A Study on Estimate of Bumper Damageability about Vehicle Shape on Car to Car Crash
Lee, Sang-Je ; Jeong, Yun-Seok ; Koo, Do-Hoi ; Lee, Mun-Yong ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 79~83
The present low speed crash regulations and RCAR test for insurance estimate do not tend to reflect car crash occurred on a road. Therefore, car makers are trying to readjust test standard be similar to a real situation. Passenger cars and SUV vehicles on the market will be subject to this study for car to car crash. In addition, we will discuss improvement of test methods for a low speed crash and direction of bumper design by performing this impact analysis.
The Integrated Control Model for the Freeway Corridors based on Multi-Agent Approach
Cho, Ki-Yong ; Bae, Chul-Ho ; Lee, Jung-Hwan ; Chu, Yul ; Suh, Myung-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 84~92
Freeway Corridors consist of urban freeways and parallel arterials that drivers can use alternatively. Ramp metering in freeways and signal control in arterials are contemporary traffic control methods that have been developed and applied in order to improve traffic conditions of freeway corridors. However, most of the existing studies have focused on either optimal ramp metering in freeways, or progression signal strategies between arterial intersections. There have been no traffic control systems in Korea that integrates the freeway ramp metering and arterial signal control. The effective control strategies for freeway operations may cause negative effects on arterial traffic. On the other hand, traffic congestion and bottleneck phenomenon of arterials due to the increasing peak-hour travel demand and ineffective signal operation may generate an accessibility problem to freeway ramps. Thus, the main function of the freeway which is the through-traffic process has not been successful. The purpose of this study is to develop an integrated control model that connects freeway ramp metering systems and signal control systems in arterial intersections. And Optimization of integrated control model which consists of ramp metering and signal control is another purpose. Optimization results are verified by comparison with the results from MATDYMO.
A Study on the Acoustical Characteristics of Exhaust Decoupler
Hur, Deog-Jae ; Lim, Jong-Yun ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 93~99
Flexible couplers are widely used for exhaust transmitted vibration reduction in vehicles. This paper describes an investigation into the acoustical characteristics of exhaust flexible coupler by the simulation and testing. Computational acoustic simulation is carrying out to investigate resonance frequency and transmission loss of decoupler using the boundary element method and transfer matrix approach. To confirm the acoustical simulation results of exhaust decoupler, we compare with measured experimental results by the test of transmission loss measurement system. In the comparison with simulation results and tests results, there is correctly fit the resonance frequency and the trend of transmission loss. Also, we show that the acoustical structure of decoupler is analogous to the expended tube or side branch resonator. The characteristics of exhaust decoupler have a marked increase in the acoustic attenuation at the specified frequency bend. Therefore the decoupler is applied to develop the exhaust system not only for the vibration isolator but also for the noise attenuator.
Finite Element Analysis of NiTi Alloy Tubes with the Superelastic Behavior
Kang, Woo-Jong ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 100~106
NiTi alloy known as its shape memory effect also has superelastic characteristic, which makes it possible to be elastic under large deformation. Since the tensile strength of the alloy is very high and density is low compared to carbon steel, it can be applied to lightweight structural design. In order to design structures with shape memory alloy, finite element analysis is used and a constitutive algorithm based on Aurrichio's model is added to LS-DYNA as a user subroutine. Explicit time integration and shell element formulation are used to simulate thin-walled structures. The algorithm uses Drucker-Prager type loading condition to calculate martensite volume fraction during the transformation. The implemented algorithm is verified in uni-axial loading condition and martensite phase transformation can be detected well with the algorithm. In this study, as a energy absorbing structure, thin-walled tube is modeled with finite elements and the deformation behavior is studied. Simulation results has shown that the martensite transformation was generated in loading condition. After plastic deformation reached, the load decreases linearly without reverse martensite transformation.
A Study on the Radiating Source of Electro-magnetic Waves in the Cabin of Automobile
Choe, Gwang-Je ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 107~114
This paper investigates the radiating source of electro-magnetic waves in the cabin of automobile with spark ignition engine. Front seats are very close to the engine room where electro-magnetic waves are expected to be radiating. But front seat area is believed to be a blind zone, which is not affected by radiating electro-magnetic waves, because a bulk board and floor board shield the front seat area. The level and frequency spectrum of electro-magnetic waves are measured at the passenger seat and the engine room. The measured frequency range is
. As a results, the level of the electro-magnetic waves of automatic transmission vehicle is greater than -82dBm. The shapes of frequency spectrum of both engine room and passenger seat are look alike. But the level of electro-magnetic waves of manual transmission vehicle is less than -82dBm and the shapes of frequency spectrum of engine room and passenger seat are different to each other. From these results, we can say that any mal-function caused by electro-magnetic waves in the automobile cabin are only possible for automatic transmission vehicle. Also, it is believed that the radiating source of electro-magnetic waves is inside the vehicle. Thus, based on the transmission line theory, this paper presumably concludes that the cables which connect all the components inside a automatic transmission vehicle must be a radiating source of electro-magnetic waves in the cabin.
Classification of the Korean Road Roughness
Choi, Gyoo-Jae ; Heo, Seung-Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 115~120
A Korean Road Roughness Classification(KRC) method is proposed. Using a dynamic road profiling device equipped with the Accelerometer Established Inertial Profiling Reference(AEIPR) method, road profile measurement is performed on various types of public paved roads in Korea. The road profiling data are processed to classify the characteristics of Korean road roughness. The resultant Korean road roughness classification(KRC) is shown different characteristics compared to the road classification proposed by ISO, MIRA, and Wong. The proposed KRC is composed of 8 classes(A-H, very good-poor) based on the power spectral density and is in good agreements with the characteristics of Korean paved road roughness and can be used well in vehicle ride comfort simulation using domestic road profile.
Analytical Approach on Intake fort Development of SI Engines Based on Correlations of Design Parameters and Flow Coefficients
Lee, Si-Hun ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 121~129
An Intake Port of SI engines plays a key role on improving engine performance by maximizing full load volumetric efficiency or by optimizing in-cylinder air motion. However, designing an intake port has been usually performed based on port experts' experience and know-how, which means that analytical analyses are relatively insufficient. In this paper, port design parameters which decide an overall port shape were defined in order to correlate them relevantly with flow test results accumulated so far. Test species were composed of all twenty eight SI engines which cover major engine displacements from 1,000cc to 4,000cc. First, they were tested on a steady state flow test rig to find out their flow coefficients. Secondly, those flow coefficients were analyzed based on the port design parameters measured from the engines. The most effective parameters were port height, valve head diameter, and the ratio of port size and cylinder bore diameter. The final correlation equation could predict flow coefficients within 2% deviation.
Thermoelastic Instability in Functionally Graded Materials
Jang, Yong-Hoon ; Ahn, Seong-Ho ; Lee, Seung-Wook ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 130~137
A transient finite element simulation is developed for the two-dimensional thermoelastic contact problem of a stationary functionally graded material between sliding layers, with frictional heat generation. Thermoelastic instability in functionally graded materials is investigated. The critical speed of functionally graded material coating disk is larger than that of the conventional steel disk. The effect of the nonhomogeneity parameter in functionally graded material is also investigated. The results show that functionally gradient materials restrain the growth of perturbation and delay the contact separation.
Exhaust Gas Temperature Characteristics of Catalytic Converter Shape for Motorcycle
Yi, Chung-Seub ; Suh, Jeong-Se ; Chung, Han-Shik ; Jeong, Hyo-Min ; Bae, Jae-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 138~144
This research represents the catalytic converter for application in the motorcycle. Present research model type is a monolithic catalytic converter and this type has been widely used for satisfaction on and the regulations of pollutant emissions in automobiles. The experiment range is found for light-off temperature time of the catalyst converter. And we has to experiment for effective area of catalytic monolith. The experimental result indicated an increase effective area in the catalytic monolith. Specialty, it was found from the result that the more positive effect from result of thermal image camera in the megaphone model. The rate of effective area for base model was about 8.97% and megaphone model was 41.52%, 34.60%, 33.43%, 25.43% and 17.82% on the diffuser angle
. Comparing with base type, megaphone type has more suitable for application to motorcycle.
A Study on the Thermal Behavior Characteristic of Drum Brake considering Braking Patterns
Lee, Kye-Sub ; Son, Sung-Soo ; Yang, Ki-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 145~154
Each part of drum brake system is loaded by continual mechanical force and thermal force every time of braking, so enough strength and stability are required. Thermal characteristic is one of the important factors in drum brake systems design. This paper presents the thermal performance such as temperature distribution and thermal contact stress of drum brake system considering several braking patterns; 80th heat braking test mode, heat fade braking test mode, general road mode, steep slope road mode and off road mode. Transient heat transfer analysis and Thermo elastic contact analysis is executed to obtain the temperature distribution, and to evaluate thermal stress of drum brake by using ABAQUS/Standard code. This procedure of analysis can effectively be used to improve the quality problem of brake system and to get design guideline of the new product.
A Study on the Weight Optimization for the Passenger Car Seat Frame Part
Jang, In-Sik ; Min, Byeong-Jo ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 155~163
Car seat is one the most important element to make comfortable drivability. It can absorb the impact or vibration during driving state. In addition to those factors, it is needed to have enough strength for passenger safety. From energy efficiency and environmental point of view lighter passenger car seat frame becomes hot issue in the auto industry. In this paper, weight optimization methodology is investigated for commercial car seat frame using CAE. Optimized designs for seat frame are developed using commercially available finite element code(ANSYS) and design of experiment method. At first, car seat frame is modelled using 3-D computer aided design tool(CATIA) and simplified for finite element modelling. Finite element analysis is carried out for the case of FMVSS 202 Head Restraint test to check the strength of the original seat frame. Two base brackets are selected as optimized elements that are the heaviest parts in the seat frame. After finite element analysis for the brackets with similar load condition to the previous test optimization technique is applied for 10% to 50% weight reduction. Design of experiment is utilized to obtain optimization design for the bracket based on the modified 50% weight reduction model in which outer shape of the bracket is conserved. Weight optimization models result in the decrease of the strength in spite of weight reduction. The more design points should be considered to get better optimized model. The more advanced optimization technique may be utilized for more parts of the seat frame to increase whole seat frame characteristics in the future.
Establishment of Fracture Criterion on Friction Welded Dissimilar Materials
Chung, Nam-Yong ; Park, Cheol-Hee ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 164~171
Application of friction welding is increasing in the manufacturing process of machine elements in many industry fields. To establish a reasonable strength evaluation method and fracture criterion, it is necessary to analyze stress singularity under the residual stress condition on friction welded interface between dissimilar materials. In this paper, a method to establish fracture criterion on interface of friction welded dissimiliar materials was investigated by using the boundary element method BEM and static tensile testing. A quantitative fracture criterion for friction welded dissimilar materials is suggested by using stress singularity factor,
Laser Diagnostics of Spray and Combustion Characteristics Using Multi-Component Mixed Fuels in a D.I. Diesel Engine
Yoon, Jun-Kyu ; Myong, Kwang-Jae ; Senda, Jiro ; Fujimoto, Hajime ; Cha, Kyung-Ok ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 172~180
This study was to analyze the effect of mixed fuel composition and mass fraction on the characteristics of evaporating diesel spray and combustion under the various ambient conditions. The characteristics of vaporization distribution and combustion were visualized by laser induced fluorescent method and direct photography. The experiments were conducted in the constant volume vessel and rapid compression expansion machine with optical access. Multi-component fuels mixed i-octane, n-dodecane and n-hexadecane were injected the vessel and rapid compression expansion machine with electronically controlled common rail injector. Experimental results show that fuel vapor formed stratified distribution. And vaporization and diffusion are become actively increasing in mass fraction of low boiling point component. Consequently multi-component fuels were expected to control the evaporating behavior according to their suitable mass fraction.
A Prediction Study for Fuel Economy Development in an Express Bus
Lyu, Myung-Seok ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 181~185
A study to get better vehicle fuel economy is described based on an express bus. The approach is based on using a commercial software vehicle simulation to identify the relative efficiency of each of the vehicle systems, such as the engine hardware, engine software calibration, transmission, cooling system and ancillary drives. The simulation-based approach offers a detailed understanding of which vehicle systems are underperforming and by how much the vehicle fuel economy can be improved if those systems are brought up to best-in-class performance. In this way, the optimum vehicle fuel economy can be provided to the vehicle customer. A further benefit is that the simulation requires only a minimum of vehicle testing for initial validation, with all subsequent field test cycles performed in software, thereby reducing development time and cost for the manufacturer.
Methodology for Optimizing Parameters of Vehicle Safety Regulation on Pedestrian Protection
Oh, Cheol ; Kim, Beom-Il ; Kang, Youn-Soo ; Youn, Young-Han ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 5, 2006, Pages 186~194
Traffic accident involved with the vulnerable pedestrian is one of the significant concerns, which has higher possibility of fatality than any other accident types. Worldwide significant efforts have been made to establish a vehicle safety regulation, which is internationally agreed, in order to reduce pedestrian casualties in pedestrian-vehicle collisions. One of the key issues in deriving the regulation is how to effectively select the parameter values associated with the regulation. This study firstly develops a method to optimize parameter values. An optimizing problem in terms of maximizing safety benefits, which are life-saving effects by the regulation, is formulated. Extensive actual accident data analysis and simulations are conducted to establish several statistical models to be used in the proposed optimization procedure. A set of parameter values that can produce maximizing life-saving effects is presented as the outcome of this study. It is expected that the proposed method would play a significant role in determining parameters as a decision support tool toward ensuring better pedestrian safety.