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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 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
A Development of a Reliability Prediction Program Using the Field Failure
Baek, Jae-Jin ; Rhie, Kwang-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 1~7
DOI : 10.7467/KSAE.2012.20.2.001
A Failure data from operating condition includes various failures. Reliability evaluation by operating condition is more correct than test condition. Additional, the evaluation result by operating condition is widely used for quality assurance, forecasting amount of manufacturing at EOL. To discover valuable things from the failure data, arrangement of the failure data and information technique to handle data is needed among many failure data. This paper introduces a reliability prediction program to solve this problem based on the failure. And new technologies for parameters estimation with method of Graphic-Wizard-Parameters-Estimation and Genetic Algorithm are introduced.
Nonlinear Dynamic Inversion Based Control for Electronic Throttle
Yang, In-Seok ; Song, Moo-Geun ; Lee, Dong-Ik ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 8~14
DOI : 10.7467/KSAE.2012.20.2.008
"Throttle-by-Wire" is an electronic throttle system in which mechanical cables and hydraulics are replaced by a fieldbus network, electric motors and sensors. It is crucial for an electronic throttle to design a controller that can offer an accurate and fast reference tracking performance in the presence of nonlinearities, such as friction in the gearbox and "limp-home" nonlinearity. This paper presents a nonlinear dynamic inversion based control algorithm for electronic throttle systems. Using the proposed method, the specified control performance can be achieved by canceling inherent nonlinear characteristics of the electronic throttle system. The control performance is investigated through a set of simulation results.
A Study on Lateral Stability Enhancement of 4WS Vehicle with Active Front Wheel Steer System
Song, Jeong-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 15~20
DOI : 10.7467/KSAE.2012.20.2.015
This study is to propose and develop an integrated dynamics control system to improve and enhance the lateral stability and handling performance. To achieve this target, we integrate an AFS and a 4WS systems with a fuzzy logic controller. The IDCS determines active additional steering angle of front wheel and controls the steering angle of rear wheel. The results show that the IDCS improves the lateral stability and controllability on dry asphalt and snow paved road when double lane change and step steering inputs are applied. Yaw rate of the IDCS vehicle tracks reference yaw rate very well and body slip angle is reduced about by 50%. Response time of the IDCS vehicle is also decreased.
Design of Rankine Steam Cycle and Performance Evaluation of HT Boiler for Engine Waste Heat Recovery
Heo, Hyung-Seok ; Bae, Suk-Jung ; Lee, Dong-Hyuk ; Lee, Heon-Kyun ; Kim, Tae-Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 21~29
DOI : 10.7467/KSAE.2012.20.2.021
A dual loop waste heat recovery system with Rankine steam cycles for the improvement of fuel efficiency of gasoline vehicles has been investigated. A high temperature loop (HT loop) only recovers the heat of the exhaust gas. A low temperature loop (LT loop) recovers the residual heat from the HT loop, the coolant heat and the remaining exhaust gas heat. The two separate loops are coupled with a heat exchanger. This paper has dealt with a layout of the dual loop system, the review of the working fluids, and the design of the cycle. The design point and the target heat recovery of the HT boiler, a core part of a HT loop, have been presented. The prototype of the HT boiler was evaluated by experiment. For the performance evaluation of the HT boiler, inlet temperature of the HT boiler working fluid was set equal to the temperature degree of sub-cool of
at the condensing pressure. The exit condition was the degree of super-heat set at
. The characteristics of the HT boiler such as heat recovery and pressure drops of fluids were evaluated with varying flow rates and inlet temperatures of exhaust gas under various evaporating pressure conditions.
Identification of Optimal Control Parameters for a Pneumatic Active Engine Mount System
Kim, Il-Jo ; Lee, Jae-Cheon ; Choi, Jae-Yong ; Kim, Jeong-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 30~37
DOI : 10.7467/KSAE.2012.20.2.030
Pneumatic Active Engine Mount(PAEM) with open-loop control system has been developed to reduce the transmission of the idle-shake vibration induced by engine effectively and economically. A solenoid valve installed between PAEM and vacuum tank is on-off switched by the Pulse Width Modulate(PWM) control signal to decrease the dynamic stiffness of the engine mount. This paper presents the methodology to identify the optimal values of control parameters of a PAEM, i.e, turn-on timing and duty ratio of PWM signal for 6 different idle driving conditions. A scanning algorithm was first applied to the vehicle test to obtain the approximate optimal control parameters minimizing the vibration at front seat rail and at steering wheel. Then the PAEM system identification was fulfilled to find accurate optimal control parameters by using multi-layer neural networks of Levenberg-Marquardt algorithm with vehicle test data.
The Analysis of Energy Consumption for an Electric Vehicle under Various Driving Circumstance
Lee, Dae-Heung ; Seo, Ho-Won ; Jeong, Jong-Ryeol ; Park, Yeong-Il ; Cha, Suk-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 38~46
DOI : 10.7467/KSAE.2012.20.2.038
This paper discusses the energy consumption for a mid-size electric vehicle(EV) under various conditions. In order to analyze which driving style is more efficient in terms of the system of the EV, we develop the electric vehicle model and apply several types of speed profiles such as different steady speeds, acceleration/deceleration, and a real world driving cycle including the elevation profile obtained from a GPS device. The results show that the energy consumption of the EV is affected by the operating efficiency of components when driving at low speed, while it depends on required power at wheels when driving at high speed. Also this paper investigates the effect of the elevation of a road and the rate of electrical braking on the energy consumption as well as the fuel economy of a conventional vehicle model under the same conditions.
Dynamic Analysis of Monorail System with Magnetic Caterpillar
Won, Jong-Sung ; Tak, Tae-Oh ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 47~55
DOI : 10.7467/KSAE.2012.20.2.047
This work deals with dynamic analysis of a monorail system with magnetic caterpillar where magnets are embedded inside each articulated element of the caterpillar, augmenting traction force of main rubber wheels to climb up slope up to 15 degree grade. Considerations are first given to determine stiffness of the primary and secondary suspension springs in order for the natural frequencies of car body and bogie associated with vertical, pitch, roll and yaw motion to be within generally accepted range of 1-2 Hz. Equations for calculating magnetic force needed to climb up given slope are derived, and a magnetic caterpillar system for 1/6 scale monorail is designed based on the derivation. To assess the hill climbing ability and cornering stability, and make sure smooth operation of the side and vertical guiding wheels which is critical for safety, a multibody model that takes into account of every component level design characteristics of car, bogie, and caterpillar is set up. Through hill climbing simulation and comparison with measurement of the limit slope, the validity of the analysis and design of the magnetic caterpillar system are demonstrated. Also by studying the curving behavior, maximum curving speed without rollover, functioning of lateral motion constraint system, the effects of geometry of guiding rails are studied.
Study of Energy Consumption Efficiency of Electric Two-wheeled Vehicle by Change of Environment Variation
Kil, Bum-Soo ; Kim, Gang-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 56~63
DOI : 10.7467/KSAE.2012.20.2.056
Environment has become a main issue nowadays. People began to show big interest in "futuristic means of transportation", which is an efficient method in
emissions reduction and decreasing use of oil. Due to the noise and emissions of two-wheel vehicle of internal combustion engine, electric two-wheeled vehicles have been supplied in downtown. The electric two-wheeled vehicles use battery as power source. The performance of lithium-ion battery changes as the ambient temperature changes. In this paper, analysis of performance variance of electric two-wheeled vehicles influenced by the temperature using the chassis dynamometer and the environmental chamber was carried out.
Development and Validation of FE Adult Headform Impactor for Pedestrian Protection
Choi, Ji-Hun ; Park, Bu-Chang ; Kim, Jong-Sun ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 64~69
DOI : 10.7467/KSAE.2012.20.2.064
Head injury is one of the most common cause of deaths in car-to-pedestrian collisions. To reduce the severity of such injuries, many international safety committees have performed headform impact test for pedestrian protection. In this paper, an adult headform impactor model is developed based on the finite element (FE) method and validated through the numerical simulation. The skin material of headform impactor is known as polyvinyl chloride skin (PVC) and its material was assumed as viscoelastic. The viscoelastic parameters of headform skin are identified by a series of trial and error methods. The new developed FE adult headform impactor is verified by the drop test and FE JARI adult headform impactor provided by Madymo program.
A Study on the PCD Plasma System as an After Treatment Apparatus in Diesel Engine
Ryu, Kyung-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 70~77
DOI : 10.7467/KSAE.2012.20.2.070
The selective catalytic reduction(SCR) system used to reduce NOx in diesel engines requires an NO/
ratio of about 1 in exhaust emissions to realize the fast SCR mode at temperatures lower than
. This study investigated the characteristics of a plasma system as a pre-active apparatus for the fast SCR reaction mode of an SCR system. Plasma was generated by the pulse corona discharge(PCD) method with a four-channel wire-cylinder reactor. This study showed that plasma was easily generated in the exhaust gas by the PCD system, and the peak voltage of the normal state condition for plasma generation was generally 12 kV. The PCD system easily converted NO into
at lower temperatures and the NO/
conversion ratio increased with the discharge current for plasma generation. But the PCD system could not convert NO into
at higher engine speeds and higher engine loads due to the lack of oxygen in exhaust gas. The PCD system also activated the diesel oxidation catalysts(DOC) system to reduce CO emissions.
Study on the Performance Characteristics of Exhaust Heat Recovery Device in Automobile
Hong, Young-Jun ; Choi, Doo-Seuk ; Kim, Jong-Il ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 78~84
DOI : 10.7467/KSAE.2012.20.2.078
The purpose of this study is to investigate the performance characteristics of new exhaust heat recovery device for the engine's fast warm-up. In this study, two different interior area designed for prototyping and on the exhaust heat recovery device to evaluate the performance compare the performance characteristics were chosen a better product. A company's product and selected prototype-2 were evaluated and compared the performance. This experiment was conducted under the same conditions. The time from starting to warm-up of engine was measured. As a result, the performance characteristics of the prototype-2 was not higher than that of the A company's product. However, in comparison with base system, prototype-2 of the exhaust heat recovery device discover that the warm-up time was shortened.
System Identification of In-situ Vehicle Output Torque Measurement System
Kim, Gi-Woo ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 85~89
DOI : 10.7467/KSAE.2012.20.2.085
This paper presents a study on the system identification of the in-situ output shaft torque measurement system using a non-contacting magneto-elastic torque transducer installed in a vehicle drivline. The frequency response (transfer) function (FRF) analysis is conducted to interpret the dynamic interaction between the output shaft torque and road side excitation due to the road roughness. In order to identify the frequency response function of vehicle driveline system, two power spectral density (PSD) functions of two random signals: the road roughness profile synthesized from the road roughness index equation and the stationary noise torque extracted from the original torque signal, are first estimated. System identification results show that the output torque signal can be affected by the dynamic characteristics of vehicle driveline systems, as well as the road roughness.
An Investigation on the Spray Characteristics of DME Common Rail Fuel Injection System with Variation of Ambient Pressure
Lee, Se-Jun ; Oh, Se-Doo ; Jeong, Soo-Jin ; Lim, Ock-Taeck ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 90~97
DOI : 10.7467/KSAE.2012.20.2.090
It is investigated of the DME spray characteristics about varied ambient pressure and fuel injection pressure using the common rail fuel injection system when the nozzle holes diameter is varied. The common rail fuel injection system and fuel cooling system is used since DME has compressibility and vaporization in atmospheric temperature. The fuel injection quantity and spray characteristics were measured. The spray was analyzed of spray shape, penetration length, and spray angle at the six nozzle holes. The 2 types injector were used, the one was 0.166 mm diameter the other one was 0.250 mm diameter. The ambient pressure which is based on gage pressure was 0 MPa, 2.5 MPa, and 5 MPa. The fuel injection pressure was varied by 5 MPa from 35 MPa to 70 MPa. When using the converted injector, compared to using the common injector, the DME injection quantity was increased 127 % but it didn't have the same heat release. Both of the common and converted injector had symmetric spray shapes. In case of converted injector, there were asymmetrical spray shapes until 1.2 ms, but after 1.2 ms the spray shape was symmetrical. Compared with the common and converted injector, the converted injector had shorter penetration length and wider spray angle than the common injector.
Light-weight Design and Simulation of Automotive Rear Bumper Impact Beam Using Boron Steels
Kim, Kee-Joo ; Han, Chang-Pyung ; Lim, Jong-Han ; Lee, Young-Suk ; Won, Si-Tae ; Lee, Jae-Woong ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 98~102
DOI : 10.7467/KSAE.2012.20.2.098
Increasing the fuel economy has been an inevitable issue for the development of new cars, and one of the important measures to improve the fuel economy is to decrease the vehicle weight. In order to obtain this goal, the researches about lighter, stronger and the well impact absorbing bumper impact beam have been studied without sacrificing bumper safety. In this study, the overall weight reduction possibility of rear bumper impact beam could be examined based on the variation of frontal, offset and corner impact crash capability by substituting a ultra high strength steel material (boron steel ) having tensile strength of 1.5 GPa grade instead of conventional steels. In addition, the section variations (open section, closed section, open section with 5 stays) of the bumper impact beam structure were examined carefully. It could be reached that this analysis could be well established and be contributed for design guide and the optimum design conditions of the automotive rear bumper impact beam development.
A Study on Near Cut-In Performance Comparison on Adaptive Cruise Control Stop&Go
Lee, Dong-Han ; Cho, Cheol-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 103~109
DOI : 10.7467/KSAE.2012.20.2.103
Adaptive cruise control Stop&Go system has been developed to reduce the driver's workload on highway or public road. This system is characterized by a moderate control of engine and brake actuator. A control system capable of modeling driver's driving characteristics has been constructed to provide natural vehicle behavior in full speed driving. But, ACC Stop&Go system has some limitations. One of the limitations is a detection limitation on near cut-in situation. This paper presents development of the near cut-in test procedure, finding of the limitation value on near cut-in scenario and performance comparisons on ACC Stop&Go system.
An Experimental Study on RCCI(Reactivity Controlled Compression Ignition) Combustion of Dual-fuel due to Injector Characteristics
Sung, Ki-An ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 110~115
DOI : 10.7467/KSAE.2012.20.2.110
This study describes the characteristics of combustion and exhaust emission in the special engine applying a fuel reactivity controlled compression ignition (RCCI) concept with two different energizing type (solenoid and piezoelectric) injectors for diesel injection. A diesel-gasoline mixed dual-fuel reactivity controlled compression ignition concept is demonstrated as a promising method to achieve high thermal efficiency and low emission in internal combustion engines for transportation vehicles. For investigating the combustion characteristics of RCCI, engine experiments were performed in a light-duty diesel engine over a range of injection timing and mixing rate of gasoline in mass. It was investigated that by increasing the nozzle hole diameter, increasing the combustion pressure and the net indicated mean effective pressure.
and soot can be reduced by advancing start of injection in 84 mixing rate of gasoline in mass. The resulting operation showed that light duty engine could achieve 48 percent net indicated efficiency and 191[g/kW-hr] net indicated specific fuel consumption with lower levels of nitrogen oxides and soot.
Effect of Injection Conditions on the Spray Behaviors of the Multi-hole GDI Injector
Park, Jeong-Hwan ; Park, Su-Han ; Lee, Chang-Sik ; Park, Sung-Wook ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 116~122
DOI : 10.7467/KSAE.2012.20.2.116
The purpose of this study is to investigate the overall spray behavior characteristics for various injection conditions in a gasoline direct injection(GDI) injector with multi-hole. The spray characteristics, such as the spray penetration, the spray angle, and the injection quantity, were studied through the change of the injection pressure, the ambient pressure, and the energizing duration in a high-pressure chamber with a constant volume. The n-heptane with 99.5% purity was used as the test fuel. In a constant volume chamber, the injected spray was visualized by the spray visualization system, which consisted of the high-speed camera, the metal-halide lamp, the injector control device, and the image analysis system with the image processing program. It was revealed that the injection quantity was mainly affected by the difference between the injection pressure and the ambient pressure. For low injection pressure conditions, the injection quantity was decreased by the increase of the ambient pressure, while it nearly maintained regardless of the ambient pressure at high injection pressure. According to the increase of the ambient pressure in the constant volume chamber, the spray development became slow, consequently, the spray tip penetration decreased, and the spray area increased. In additions, the circular cone area decreased, and the vortex area increased.
An Experimental Study on the Clutch Type Water Pump of Diesel Passenger Vehicle for Reducing Fuel Consumption and CO
Jeong, Soo-Jin ; Park, Jung-Kwon ; Oh, Chang-Boke ; Cho, Yong-Seok ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 123~134
DOI : 10.7467/KSAE.2012.20.2.123
A typical cooling system of an engine relies on a water pump that circulates the coolant through the system. The pump is typically driven by the crankshaft through a mechanical link with engine starting. In order to reduce the friction and warm-up time of an engine, the clutch-type water pump (CWP) was applied in 2.0 liter diesel vehicle. The clutch-type water pump can force cooling water to supply into an engine by the operation of an electromagnetic clutch equipped as the inner part of pump system. The onset of CWP is decided by temperature of cooling water and engine oil. And, the control logic for an optimal operation of the clutch-type water pump was developed and applied in engine and vehicle tests. In this study, the warm-up time was measured with the conventional water pump and clutch-type water pump in engine tests. And the emission and the fuel consumption were evaluated under NEDC mode in vehicle tests. Also, tests were carried out for the various temperature conditions starting the operation of CWP. From the results of the study, the application of CWP can improve the fuel consumption and
reduction by about 3%.
Optimal Control 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 2, 2012, Pages 135~140
DOI : 10.7467/KSAE.2012.20.2.135
Fuel Cell Hybrid Vehicles (FCHVs) have already become the subject of major interest among automotive industry as well as power management strategies of FCHVs, as the fuel economy of FCHVs depends on them. There are several types of power management strategies of FCHVs that have been developed to improve the fuel economy of FCHVs. Among them, optimal control theory is applied to this study. A problem is defined and its objective is to minimize the energy consumption of an FCHV and to find the optimal trajectories of powertrain parameters during driving. Necessary conditions for the optimal control are introduced and the simulation results of constant costate are compared to that of variable costate in order to prove that the variable costate can be replaced with the constant costate.
Durability Analysis on Automotive Engine Mount
Han, Moon-Sik ; Cho, Jae-Ung ;
Transactions of the Korean Society of Automotive Engineers, volume 20, issue 2, 2012, Pages 141~147
DOI : 10.7467/KSAE.2012.20.2.141
Engine mount is used to soften the impact of bumper with elasticity recovery and damping capacity. Inner noise and vibration to influence the comfortableness for passenger cause the engine to the chattering phenomenon. In this study, structural analysis can be done by engine mounts designed with 3D modelling. Natural frequencies and harmonic responses are analyzed by using models with some kinds of configurations. When the simulation model is applied by the force of 600N within the range of natural frequencies, the magnitude of deformation becomes 0 to 3mm. As the number of holes around inside mount increases, the capability of vibration absorption and durability becomes larger. In case of 5holes around inside mount, it can be safest on durability. The life of mount becomes larger by changing the configuration of model. The engine mount improved with durability can be designed through the result of simulation.