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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 22, Issue 7 - Nov 2014
Volume 22, Issue 6 - Sep 2014
Volume 22, Issue 5 - Jul 2014
Volume 22, Issue 4 - May 2014
Volume 22, Issue 3 - Apr 2014
Volume 22, Issue 2 - Mar 2014
Volume 22, Issue 1 - Jan 2014
Selecting the target year
Experimental Research on the Power Saving Effect Evaluation of a Variable Displacement Vane Pump for an Automatic Transmission
Kim, Chulsoo ; Bae, Chulyong ; Kim, Chanjung ; Kim, Kyusik ; Son, Taekwan ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 1~7
DOI : 10.7467/KSAE.2014.22.7.001
A variable displacement vane pump is possible to improve the fuel economy by varying the pump capacity with a vane mechanism according to the engine operating speed range and reducing its driving torque. In general the experimental evaluation of the vane pump for the transmission has been performed mainly not with the vehicle or dynamometer test rig but with component test rig due to the implementation and safety problems. In this paper, in order to evaluate the performance of the developed vane pump as well as the compatibility with other rotary and hydraulic components of the target transmission, the transmission dynamometer based test rig is implemented where the developed pump is built into it and then the variable pump capacity and effect of power reduction are investigated experimentally.
Experimental Evaluation of EGR and Fuel Injection Pressure on Combustion, Size-resolved Nano-particle and NOx Emissions Characteristics in an Advanced Light-duty Diesel Engine
You, Jung Been ; Ko, Ahyun ; Jang, Wonwook ; Baek, Sungha ; Jin, Dong Young ; Myung, Cha-Lee ; Park, Simsoo ; Han, Jung Won ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 8~15
DOI : 10.7467/KSAE.2014.22.7.008
In order to satisfy stringent future emission regulation in diesel engines, systematic approaches to mitigate the harmful exhaust emissions were developed, such as engine hardware, fuel injection equipment, engine control, and after-treatment system. In this study, to improve the nano-particle and NOx emissions from a state-of-the-arts diesel engine, effect of various EGR and fuel injection pressure with combustion analysis were evaluated. Size-resolved nano-particle and NOx emissions showed trade-off characteristics with various EGR rate and increment of fuel injection pressure.
Computational Study of Automotive Drum Brake Squeal
Jung, Taeksu ; Cho, Chongdu ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 16~22
DOI : 10.7467/KSAE.2014.22.7.016
Automotive NVH on brake operation is mainly caused by a coupling action of vehicle speed and inter parts friction and its frequency occurs over a broad band of 0.1 kHz~10 kHz. Especially, squeal noise, being a self-excited vibration generated by friction force between drum and lining, occurs over 1 kHz and consequently dynamic instability is induced when friction energy is applied to a brake vibration system. The squeal strongly depends on nonlinear properties influenced by the material of lining, velocity of vehicle, and the dynamic properties of a brake system. The dynamic properties are considered as a main influential design factor to squeal noise, however the analysis of the properties are rarely facilitated due to arbitrariness of shape by wearing down. In this paper, we research generating tendency of squeal noise through complex eigenvalue analysis, tracking drum brake`s unstable modes in accordance with the wear shape of drum and lining such as tapered and bellmouth shape, and analyze computed unstable modes by variable shapes.
Development of a Headlamp Testing System for Automobile Headlamp Beam Pattern Recognition
Kim, Junghoon ; Cho, Chiwoon ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 23~30
DOI : 10.7467/KSAE.2014.22.7.023
"Cut off line" in automotive passing beam has very important safety function because it serves for headlamp aiming. Headlights that are aimed incorrectly will not only perform poorly but also offend oncoming traffic. In addition, an objective definition of cut off line in low beam is necessary, since a requirement for correct aiming of the beams is specified within all the existing regulations. Accordingly, headlight regulations are requirements that automobiles must satisfy in order to be sold in a particular country. In this study, a more advanced recognition method for the cut off lines of the various headlamps commonly used in Europe, North America, and domestic is suggested and a headlamp testing system is developed to adjust the beam to the country-specific regulation. This system uses image processing technology to detect the cut off lines in the beam patterns of halogen headlamps, high-intensity discharge headlamps, and light-emitting diode headlamps as well.
Application and Analysis of 1D FRI (Finite Rate of Innovation) Super-resolution Technique in FMCW Radar
Yoo, Kyungwoo ; Kong, Seung-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 31~39
DOI : 10.7467/KSAE.2014.22.7.031
Recently, as Intelligent Transportation System (ITS) and self-driving system become influential in the ground transportation system, automotive radar systems have been actively studied among the various radar systems to implement the vehicle collision detection system and distance measurement system between vehicles. Most of the automotive radars are Frequency Modulated Continuous Wave (FMCW) radar type which can calculate distance and velocity of target by estimating the frequency difference between the transmitted signal and received signal. Therefore, accurate frequency estimation is very important in the FMCW radar system. For this reason, to improve the measurement accuracy of the FMCW radar, Reverse Directional FRI (RD-FRI) Super-Resolution technique which has high frequency estimation accuracy is applied to the FMCW radar system. The feasibility of the proposed technique is evaluated with simulation results and compared with FFT and conventional Super-Resolution techniques. The simulation results show that the proposed technique estimates the frequency with high accuracy and the distance with centimeter accuracy.
Matching GIS Lane Data with Vehicle Position Using Camera Image
Kim, Min-Woo ; Moon, Sang-Chan ; Joo, Da-Ni ; Lee, Soon-Geul ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 40~47
DOI : 10.7467/KSAE.2014.22.7.040
This paper proposes a matching method of GIS lane information with a vehicle position using camera image to reduce DGPS error. Images of straight road are taken using a camera that is installed on the front center of the vehicle, and the distance between the vehicle and the lane are estimated using the images. The current GIS lane data is matched by comparing the estimated distance and the measured distance using a DGPS. Inverse perspective mapping is used to minimize the error of image processing from the heading angle, and single buffering method is applied to decide the exact moment of GIS match. Through practical test on the highway, feasibility of the GIS matching using camera image is confirmed.
A Study on the Property and Performance Characteristics of Different Kind Engine Oil by Endurance Test of Heavy-duty Diesel Engine
Lee, Minho ; Kim, Jeonghwan ; Song, Hoyoung ; Kim, Giho ; Ha, Jonghan ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 48~56
DOI : 10.7467/KSAE.2014.22.7.048
Engine oil is an oil used for lubrication of various internal combustion engines. The main function is to reduce wear on moving parts; it also cleans, inhibits corrosion, improves sealing, and cools the engine by carrying heat away from moving parts. In engines, there are parts which move against each other. Otherwise, the friction wastes the useful power by converting the kinetic energy to heat. Those parts were worn away, which could lead to lower efficiency and degradation of the engine. It increases fuel consumption, decreases power output, and can induce the engine failure. This study was conducted to evaluate the relation between engine oil property changes and engine performance for the diesel engine. This test was performed by using 12L, 6 cylinder, heavy duty engines. Low SAPS 10W30 engine oil (two type engine oils) was used. Test procedure and method was in accordance with the modified CEC L-57-T97 (OM441LA) method. In this study, TAN, TBN, KV and metal components, engine power, blowby gas, A_F were presented to evaluate the relation with engine oil property changes and engine performance. TAN, TBN, KV and metal We found that the components were generally increased but engine performance did not change. This results mean that property changes did not affect on engine performance because those were not enough to affect engine performance.
An Experimental Study on the Heating Performance of Coolant Heat Source Heat Pump System for Zero Emission Vehicles
Lee, Daewoong ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 57~62
DOI : 10.7467/KSAE.2014.22.7.057
This study presented the feasibility of a coolant heat-source heat pump system as an alternative heating system for electrically driven vehicles. Heat pumps are among the most environmentally friendly and efficient heating technologies in residential buildings. In various countries, electric mobiles devices such as EV, PHEV, and FCEV, have been mainly concerned with heat pumps for new mobile markets. The experiments herein were conducted for various ambient temperatures and coolant temperatures to reflect the winter season. The system, a coolant heat-source heat pump, consisted of an inside heat exchanger, an outside heat exchanger, a motor driven compressor, an electronic expansion valve, and plumbing parts. For the experimental results, the maximum heating capacity and air discharge temperature are up to 6.3 kW and
respectively at an ambient temperature of
, and coolant at
. However, at
ambient temperature and
coolant temperature, conditions were insufficient to warm the cabin as the air discharge temperature was
Thermal Fluid Flow and Deformation Analysis of Medium Commercial Vehicle Ventilated Brake Disc in Braking
Kang, Chaeuk ; Choi, Gyoojae ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 63~69
DOI : 10.7467/KSAE.2014.22.7.063
Domestic automobile companies have adopted drum type brake system for commercial vehicles. However recently those companies have been applying disc-brake system to solve vehicle control-instability and inefficient heat discharge performance of conventional drum brake system for a medium commercial vehicle. Because the kinetic energy of a running commercial vehicle is relatively high, the brake system should discharge lots of heat energy while braking. A ventilated type brake disc has been used to increase heat discharge performance of a brake system. The vent structure of a disc highly affects cooling efficiency. This paper compares thermal characteristics of three types of vent structure in JASO C421 braking condition. It is found that the slant bend type disc has the lowest temperature and thermal stress distributions in the braking condition.
A Study on Correlation of Effective Discharge Energy and Exhaust Emission of Gasoline Vehicle
Yoo, Jongsik ; Kim, Chulsoo ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 70~75
DOI : 10.7467/KSAE.2014.22.7.070
The experiment was done on traveling at the speed of 20km/h, 60km/h and 100km/h using the performance testing mode for chassis dynamometer. The experimental method were employed to measure the waveform of secondary ignition coil and exhaust emission. In this experiment, the correlation between the secondary waveform coming from ignition coil and exhaust emission were measured in decrepit vehicle. The secondary waveform characterized by the value of effective discharge energy. The following results are obtained by analyzing the data relativity between the effective discharge energy and exhaust emission. The variation rate of effective discharge energy was largest 60km/h, 20km/h, 100km/h velocity in the ordered named. As the vehicle velocity increases, the average variation rate of CO and
decreases and that of HC and
decrease. The value of effective discharge energy, CO,
and fuel consumption is measured badly in case of car with failures in MAP, spark plug and good in case of car with before and after maintenance regardless of vehicle velocities. The value of effective discharge energy is to be nearly parabolic shape as vehicle velocity increases. As the value of effective discharge energy increases, the value of
, HC and
decrease, the value of CO increase. The most sensible factors of exhaust emission were CO,
, and the small variation factors were HC,
Development of Real-time Diagnosis Method for PEMFC Stack via Intermodulation Method
Lee, Young-Hyun ; Yoo, Seungyeol ; Kim, Jonghyeon ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 76~83
DOI : 10.7467/KSAE.2014.22.7.076
During PEMFC(Proton Exchange Membrane Fuel Cell) operation monitoring and diagnosis are important issues for reliability and durability. Stack defect can be followed by a critical cell voltage drop in the stack. One method for monitoring the cell voltage is CVM(Cell Voltage Monitoring), where all cells in the stack are electrically connected to a voltage measuring system and monitored these voltages. The other methods are based on the EIS(Electrochemical Impedance Spectroscopy) and on nonlinear frequency response. In this paper, intermodulation(IM) method for diagnosis PEMFC stack is introduced. To detect one or more critical PEMFC cell voltage PEMFC stack is excited by two or more test sinusoid current, and the frequency response of the stack voltage is analyzed. If one or more critical cell voltage exists, higher harmonics on the voltage frequency spectrum will appear. For the proposed IM method, stack simulation and experiments are conducted.
Study on Optimization of Fuel Injection Parameters and EGR Rate of Off-road Diesel Engine by Taguchi Method
Ha, Hyeongsoo ; Ahn, Juengkyu ; Park, Chansu ; Kang, Jeongho ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 84~89
DOI : 10.7467/KSAE.2014.22.7.084
Not only the emission regulation of on-road vehicle engine, but also emission regulation of off-road engine have been reinforced. It is the reason of wide application of emission reduction technology for off-road engines. In this study, optimization of engine parameters (Injector hole number, Injection timing and EGR rate) for reduction of NOx and smoke emissions were conducted by using the analysis of sensitivity and S/N ratio of Taguchi method(DOE). As results, this paper shows optimum value of the parameters for NOx and smoke emission reduction. From the result of reproducibility verification, it is final that the prediction value of NOx and smoke has the error of below 10%. Consequently, the method and results of this study will be used for quantitative reference to EGR control mapping in next study.
Combustion and Emissions Characteristics of a Diesel Engine with the Variation of the HP/LP EGR Proportion
Park, Youngsoo ; Bae, Choongsik ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 90~97
DOI : 10.7467/KSAE.2014.22.7.090
The effects of high pressure and low pressure exhaust gas recirculation (HP/LP EGR) portion on diesel engine combustion and emissions characteristics were investigated in a 2.2 L passenger-car diesel engine. The po3rtion of HP/LP EGR was varied from 0 to 1 while fixing the mass flow rate of fresh air. The intake manifold temperature was lowered with the increasing of the portion of LP EGR, which led to the retardation of heat release by pilot injection. The lowered intake manifold temperature also resulted in low nitrogen oxide (NOx) emissions due to decreased in-cylinder temperature and prolonged ignition delay, however, the carbon monoxide (CO) emission showed opposite trend to NOx emissions. The brake specific fuel consumption (BSFC) was decreased as the portion of LP EGR increased due to lowered exhaust manifold pressure by wider open of turbocharger vane. Consequently, the trade-off relationship between NOx and BSFC could be improved by increasing the LP EGR portion.
The Effect of Fuel Injection Strategy on Combustion and Nano-particle Emissions in a Small Diesel Engine
Kang, Seok-Ho ; Lee, Seang-Wock ; Eom, Dong-Seop ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 98~106
DOI : 10.7467/KSAE.2014.22.7.098
Emission standards for passenger diesel engines are becoming more and more stringent. Especially, Europe started the regulation of nano-particles from 2011 with EURO 5b. The objective of this study is to investigate the effect of fuel injection strategy on combustion and nano-particle emission in a small diesel engine. In this study, we conducted combustion analysis and measured both the weight of PM and number of nano-particels. At first, the optimum injection timing was determined with fixed engine operating conditions, such as engine speed, load, and fuel injection quantity. After that, the injection timing was controlled, and the effect of pilot injection was investigated. The number of nano-particles increased as engine load decreases, and it increased up to 10 times depending on the change of injection timing. The weight of PM emissions was increased at low load, and the PM emissions increased with increasing the number of pilot injections.
Road Surface Marking Detection for Sensor Fusion-based Positioning System
Kim, Dongsuk ; Jung, Hogi ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 107~116
DOI : 10.7467/KSAE.2014.22.7.107
This paper presents camera-based road surface marking detection methods suited to sensor fusion-based positioning system that consists of low-cost GPS (Global Positioning System), INS (Inertial Navigation System), EDM (Extended Digital Map), and vision system. The proposed vision system consists of two parts: lane marking detection and RSM (Road Surface Marking) detection. The lane marking detection provides ROIs (Region of Interest) that are highly likely to contain RSM. The RSM detection generates candidates in the regions and classifies their types. The proposed system focuses on detecting RSM without false detections and performing real time operation. In order to ensure real time operation, the gating varies for lane marking detection and changes detection methods according to the FSM (Finite State Machine) about the driving situation. Also, a single template matching is used to extract features for both lane marking detection and RSM detection, and it is efficiently implemented by horizontal integral image. Further, multiple step verification is performed to minimize false detections.
Development of Urban Driving Cycle for Performance Evaluation of Electric Vehicles Part I : Development of Driving Cycle
Yang, Seong-Mo ; Jeong, Nak-Tak ; Kim, Kwang-Seup ; Choi, Su-Bin ; Wang, Maosen ; Kim, Hyun-Soo ; Suh, Myung-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 117~126
DOI : 10.7467/KSAE.2014.22.7.117
Recently, due to various environmental problems such as global warming, increasing of international oil prices and exhaustion of resource, a paradigm of world automobile market is rapidly changing from vehicles using internal combustion engine to eco-friendly vehicles using electric power such as EV (Electric Vehicle), HEV (Hybrid Electric Vehicle), PHEV (Plug-in Hybrid electric Vehicle) and FCEV (Fuel Cell Electric Vehicle). There are many driving cycles for performance evaluation of conventional vehicles. However there is a lack of researches on driving cycle for EV. This study is composed of part 1 and part 2. In this paper part 1, in order to develop urban driving cycle for performance evaluation of electric vehicles, Gwacheon-city patrol route of police patrol car was selected. Actual driving test was performed using EV. The driving data such as velocity, time, GPS information etc. were recorded. GUDC-EV (Gwacheon-city Urban Driving Cycle for Electric Vehicles) including road gradient was developed through the results of analyzing recorded data. Reliability of the driving cycle development method was substantiated through comparison of electricity performance. In the second part of this study, the developed driving cycle was compared to simulation result of the existing urban driving cycle. Verification of the developed driving cycle for EV performance evaluation was described.
Optimization Design and Development of the Proportional Pressure Control Valve Analysis Model of Active Body Control
Kim, Dongmyung ; Jang, Joosup ; Son, Taekwan ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 127~134
DOI : 10.7467/KSAE.2014.22.7.127
Active body control system is an important system for determining the driving stability and ride comfort of the vehicle. Active body control system is composed of a cylinder unit power supply unit, and control valve unit. Control valve is a proportional pressure control valve, the dynamic characteristics of the valve affects the performance of the active body control system. We have developed an analytical model, we analyzed the design parameters of the proportional pressure control valve. Further, by knowing the design parameters effect on the system and to optimize the design parameters, and improved performance of the dynamic properties.
Development of Power Measurement Method for Electrified Vehicles
Choi, Dongseok ; Ryu, Kihyeon ; Lee, Jaewan ; Park, Yongsung ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 135~143
DOI : 10.7467/KSAE.2014.22.7.135
Electrified vehicles can be classified with hybrid electric vehicles, battery electric vehicles and fuel cell electric vehicles. These vehicles have two more than energy converters which are the part of a powertrain. It is particularly difficult to estimate the power of hybrid electric vehicles due to two different energy converters with different power characteristics. Therefore, a new power concept for these vehicles is needed. The vehicle power as the new concept for solving this problem was defined in this study. The test method and the procedure were made a development in this study. Four electrified vehicles with different electric fraction were used to validate the method. Two percentage of COV was suggested as a criterion for the maximum vehicles power based on the previous studies. The repeatability of this method was within
per cent for the maximum vehicle power and within
per cent for the vehicle speed at maximum vehicle power.
Characteristics of Aggression and Brake Judder by Different ZrSiO
Lee, GirHyoung ; Kang, KukHyoun ; Lee, DongKyu ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 144~151
DOI : 10.7467/KSAE.2014.22.7.144
Recently, according to the advances of vehicle manufacturing technology and the fuel-efficient vehicles, the weight of the vehicle body has been reduced and quietness of the vehicle has been increased. So that, as the emotional qualities of cars, such as NVH, are emphasized in recent years. Also required to be established of the effective measure for brake Judder. The Judder was caused by the increase in DTV by the uneven thermo metamorphosis of brake disc and the partial abrasion of disc. In this study, the disc aggression by friction materials was confirmed and the improving methods of friction materials in connection with the abrasive characteristics reviewed of
each particle size(under
). In addition, the study is institute make use of limit for
raw-material particle size and vol% in friction materials. At the result, the optimum size of
particles was confirmed about 5 to
Automated Modeling and Structure Analysis of Bellows
Lee, Seungwoo ; Yang, Chulho ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 7, 2014, Pages 152~157
DOI : 10.7467/KSAE.2014.22.7.152
Pro-program function of Pro/E has been utilized to expedite the design process of bellows. Design parameters selected for bellows design are manipulated to obtain the shapes user specified. User-oriented function may automate the bellows design process and this function may enable to reduce the design time remarkably. Generated bellows solid model has been applied to study of design sensitivity and optimum design. Among the selected design parameters, thickness of bellows affects system response most. Control-ring installed bellows may reduce the stress and prove to be an effective element for heavy load. The finite element analysis results combined with 3D model generated by pro-program may provide the feasible design directions to the bellows designer.