Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 17, Issue 6 - Nov 2009
Volume 17, Issue 5 - Sep 2009
Volume 17, Issue 4 - Jul 2009
Volume 17, Issue 3 - May 2009
Volume 17, Issue 2 - Mar 2009
Volume 17, Issue 1 - Jan 2009
Selecting the target year
Spray and Combustion Characteristics of Biodiesel-Ethanol Blending Fuel
Eom, Dong-Seop ; Choi, Yeon-Soo ; Choi, Yong-Seok ; Lee, Seang-Wook ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 1~7
Ethanol has properties of a lower setting point, higher oxygen contents, lower cetane numbers, and also higher volatility compared to biodiesel. Thus, biodiesel fuel can be improved in the fluidity of and exhaust emissions by blended ethanol fuel. This research aims to understand combustion characteristics of biodiesel-ethanol blending fuel inside a constant volume chamber by obtaining some fundamental data in order to improve combustion atmosphere. To understand the physics of combustion, high speed camera was applied to visualize the development of combustion processes, and combustion pressure and exhaust emission were measured at several blending ratios of ethanol and biodiesel fuel. This information may contribute to improve the performance of biodiesel engine and reduce emissions in future.
An Investigation of HCCI Combustion Processes of Stratified Charge Mixture Using Rapid Compression Machine
Lim, Ock-Taeck ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 8~14
Effect of heterogeneity of combustion chamber has been thought as one of the way to avoid dramatically generating heat in HCCI Combustion. The purpose of this research is to investigate the effect of heterogeneity, especially thermal stratification and fuel strength stratification on HCCI Combustion fueled with DME and n-Butane. Thermal stratification is formed in Combustion Chamber of Rapid Compression Machine with 3 Kinds of pre-mixture has different properties. The stratified charge mixture is adiabatic compressed and on that process, in cylinder gas pressure and two-dimensional chemiluminescence images are measured and analyzed.
Mechanical Properties Anisotropy of Plain Weave Glass Fabric Reinforced Epoxy Resin Laminates
Kim, Yon-Jig ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 15~21
The anisotropic mechanical properties were measured for the three orthogonal orientations of plain weave glass fabric reinforced epoxy resin laminate. In tensile and flexural tests, axial and edge type specimens failed by pull-out of warp and fill yarns, respectively. In contrast, the thickness type specimens failed by adhesive failure process. Longitudinal cracking occurred in several of the edge type specimens during tensile test. That cracking caused pop-in in the stress-strain curve. Defects induced by improper coupon machining caused that cracking.
Design of Magneto-Rheological Clutch Coil Operation Unit using Electro Magnetic Field Analysis
Song, Jun-Han ; Choi, Dook-Hwan ; Chun, Chong-Keun ; Kwon, Young-Chul ; Lee, Tae-Haeng ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 22~28
Recently, there has been an active study about smart fluid to control the vibration, in which MR fluid is evaluated as most efficient because it can generate different bonding forces based on the intensity of the external magnetic fields. This paper attempts to find a mechanism that, under limited conditions during a clutch production that uses such dynamic characteristic, defects the maximum intensity of electromagnetism. Using the finite element analysis program, we predicted a change within the bonding force of the MR fluid occurring inside the clutch when it is subjected to an increased electric current. In addition, we analyzed the change in the magnetic intensity when the coil comprising the coil control center is switched to multiple lines from the standard single line, to find a mechanism that can maximize the effect. Based on this analysis, we developed the clutch and tested its function, hoping to widen future MR fluid's range of application.
Prediction of Particulate Matter Being Accumulated in a Diesel Particulate Filter
Yu, Jun ; Chun, Je-Rok ; Hong, Hyun-Jun ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 29~34
Diesel particulate filter (DPF) has been developed to optimize engine out emission, especially particulate matter (PM). One of the main important factors for developing the DPF is estimation of soot mass being accumulated inside the DPF. Evaluation of pressure drop over the DPF is a simple way to estimate the accumulated soot mass but its accuracy is known to be limited to certain vehicle operating conditions. The method to compensate drawback is adoption of integrating time history of the engine out PM and burning soot. Present study demonstrates current status of the soot estimation methods including the results from the engine test benches and vehicles.
A Study on T-Joint Welding by High Power Fiber Laser of SAPH Steel Plate for Automobile
Oh, Yong-Seok ; Yoo, Young-Tae ; Shin, Ho-Jun ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 35~44
The purpose of this paper is to describe experimental results about the T-joint welding of the high power continuous wave (CW) fiber laser for SAPH steel plate for seat frame of car. The seat rail is a part of seat frame of cars. The assembling method is mostly fix up using a bolt and nut. But this assembling method has many demerits in productivity such as increasing work process and material cost. This paper presents an experimental study about Laser T-Joint weldability of seat rail. Laser welding has many advantages in lightness and saving material costs of seat frame. The laser beam was moved along the work pieces by six axis robot with process optical fiber. The laser beam is focused with a welding head within incident angle
for the purpose of the T-joint welding through two side full penetration. The range of the root gap size is less than
. Optical microscopy SEM were performed to observe the micro structures and determine the structures of welded zone.
A Study on Die Casting Process of the Automobile Oil Pan Using the Heat Resistant Magnesium Alloy
Shin, Hyun-Woo ; Chung, Yeon-Jun ; Kang, Seung-Goo ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 45~53
Die casting process of Mg alloys for high temperature applications was studied to produce an engine oil pan. The aim of this paper is to evaluate die casting processes of the Aluminium oil pan and in parallel to apply new Mg alloy for die casting the oil pan. Temperature distributions of the die and flow pattern of the alloys in cavity were simulated to diecast a new Mg alloy by the flow simulation software. Dies have to be modified according to material characteristics because melting temperature and heat capacity are different. We changed the shape and position of runner, gate, vent hole and overflow by the simulation results. After several trial and error, oil pans of AE44 and MRI153M Mg alloys are produced successfully without defect. Sleeve filling ratio, cavity filling time and shot speed of die casting machine are important parameter to minimize the defect for die casting Magnesium alloy.
Development of a Model Based Predictive Controller for Lane Keeping Assistance System
Hwang, Jun-Yeon ; Huh, Kun-Soo ; Na, Hyuk-Min ; Jung, Ho-Gi ; Kang, Hyung-Jin ; Yoon, Pal-Joo ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 54~61
Lane keeping assistant system (LKAS) could save thousands of lives each year by maintaining lane position and is regarded as a promising active safety system. The LKAS is expected to reduce the driver workload and to assist the driver during driving. This paper proposes a model based predictive controller for the LKAS which requires cooperative driving between the driver and the assistance system. A Hardware-In-the-Loop-Simulator (HILS) is constructed for its evaluation and includes Carsim, Matlab Simulink and a lane detection algorithm. The single camera is mounted with the HILS to acquire the monitor images and to detect the lane markers. The simulation is conducted to validate the LKAS control performance in various road scenario.
Application of Biodiesel Fuel and EGR Method in an IDI Diesel Engine
Choi, Seung-Hun ; Oh, Young-Taig ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 62~67
In this study, the potential possibility of biodiesel fuel was investigated as an alternative fuel for a naturally aspirated indirect injection diesel engine. The smoke emission of biodiesel fuel was reduced remarkably in comparison with diesel fuel, that is, it was reduced approximately 36% at 2000rpm, full load condition. And, power, torque and brake specific energy consumption showed no significant differences. However, NOx emission of biodiesel fuel was increased compared with commercial diesel fuel. Also, the effects of exhaust gas recirculation(EGR) to reduce the NOx emission has been investigated. It was found that simultaneous reduction of smoke and NOx was achieved with biodiesel fuel(20vol-%) and cooled EGR method
The Study on Disaccord between Industry and College in the Field of Automotive Electricity on Technical Engineering Education
Park, Sung-Jong ; Han, Myoung-Seok ; Kim, Young-Il ; Lee, Sang-Jun ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 68~73
The purpose of this study is to assess key competencies, especially mathematical skills and communications skills, in order to find disaccord between industry and college in the field of automotive electricity on technical engineering education. For this study, an assessment sheet is consisted of nine questions items. Four questions items of them are to assess mathematical skills and five questions items of them are to assess communications skills. 134 copies returned assessment sheets are analyzed after data cleaning and it is concluded that disaccord between industry and college in the field of automotive electricity on technical engineering education is found.
Effect of Slip-Controlled Torque Converter Damper Clutch in 5-Speed Automatic Transmission on Slip Rate and Fuel Economy
Lee, Gee-Soo ; Kim, Deok-Jung ; Kim, Hyun-Chul ; Na, Byung-Chul ; Heo, Hyung-Seok ; Lee, Ho-Gil ; Jang, Jae-Duk ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 74~80
The objective of this paper was to investigate the slip rate and the slip frequency number of damper clutch of torque converter in 2.4L passenger vehicle with 5-speed A/T and analyze the effect of slip control and control strategy on driving characteristics and the fuel economy. The newly developed torque converter with the more durable wet friction material and the slip-controlled damper clutch system, the DCC system, was installed, which was easily compatible and amendable of the lock-up clutch of the base system. The vehicle has been tested on the fuel economy modes such as FTP-75, HWFET and NEDC (ECE15+EUDC) driving cycle at chassis dynamometer. The DCC mode (II), of which the control strategy had both the lock-up and the slip-controlled clutch, and the DCC mode (I) with full slip-controlled clutch were compared with the base system with only the lock-up clutch. As the research result, comparison to base system, the fuel consumption of the vehicle with the DCC control (II) was effectively improved by 6.6% and 7.7% on FTP-75 and NEDC mode.
Characteristics of Nano-particle Emitted by Auto-ignited Engine with ULSD, Bio-diesel and DME Fuel and Effects of Oxidation Catalyst on Its Reduction
Lee, Jin-Wook ; Bae, Choong-Sik ; Schonborn, Alessandro ; Ladommatos, Nicos ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 81~89
In this experimental study, the effects of clean alternative fuels compatible with diesel combustion on nano-sized particle emission characteristics were investigated in a 0.5L auto-ignited single-cylinder engine with a compression ratio of 15. Because the number concentration of nano-sized particles emitted by automotive engine, that are suspected of being hazardous to human health and environment, might increase with engine fuel considerably and recently attracted attention. So a ultra-low sulfur diesel(ULSD), BD100(100% bio-diesel) and Di-Methyl Ether(DME) fuels used for this study. And, as a particle measuring instrument, a fast-response particle spectrometer (DMS 500) with heated sample line was used for continuous measurement of the particle size and number distribution in the size range of 5 to 1000nm (aerodynamic diameter). As this research results, we found that this measurements involving the large proportion of particles under size order of 300nm and number concentration of
allowed a single or bi-modal distribution to be found at different engine load conditions. Also the influence of oxygen content in fuel and the catalyst could be a dominant factor in controlling the nano-sized particle emissions in auto-ignited engine.
On-Road Testing and Calculation of Emission Factor and Fuel Economy
Lee, Tae-Woo ; Lee, Beom-Ho ; Cho, Seung-Hwan ; Park, Jun-Hong ; Eom, Myoung-Do ; Kim, Jong-Choon ; Lee, Dae-Yup ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 90~101
An objective of this study is to suggest a procedure to evaluate vehicle emissions regardless of the driving pattern. Field experiments using portable emission measurement system were conducted under the real world driving cycle. Standardized average for NOx,
emission and fuel consumption rates were calculated while the vehicle specific power distribution within each vehicle speed bin was taken into consideration. Composite emission factor and fuel economy, which were obtained based on the standardized average results and traffic statistics, showed good similarity to those acquired through the conventional chassis dynamometer tests qualitatively as well as quantitatively. Considering that a conventional method obviously has a limitation to reflect various characteristics of the real world, the new approach suggested in this study can be used as an alternative procedure to collect more specific data to establish the mobile emission factors.
Analysis of Stumble of Manual Transmission Vehicle during Standing Start
Kang, Jae-Hoon ; Kim, Tak-Soo ; Park, Kyung-Suk ; Han, Tae-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 102~109
The stumble (abrupt and big acceleration decrease) occurring in manual transmission vehicle while standing start is analyzed by simulation model. This model was verified by comparing to test results. Mechanism of the stumble is clarified by analyzing simulation results and the key mechanism of the stumble is angular vibration of powertrain including wheel and tires. As a result, several method that can reduce the stumble is proposed by carrying out parametric study, increasing low end torque of engine, increase gear ratio etc.
A Experimental Study on the Performance of Climate Control Seats Using the Discharge Port of the Shape of Nozzle
Jung, Jung-Hoon ; Kim, Sung-Chul ; Won, Jong-Phil ; Noh, Sang-Ho ; Cho, Yong-Seok ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 110~116
Research for climate control seats is being vigorously pursued because requests for passenger's thermal comfort are increasing. Recently, thermoelectric devices have been applied to automotive seats for both cooling and heating operations. The climate control seats using thermoelectric devices can rapidly control the air temperature passing through the devices and directly affect the thermal comfort of passengers. The performance characteristics of the climate control seats were analyzed by experiments for two different types of a leather covered seat and a mesh applied seat. Experimental results show that the cooling and heating performance for the mesh applied seat by using the discharge port of the shape of nozzle was improved significantly in comparison with that for the leather covered seat. The variation of temperature between the inlet air and the outlet air of the climate control seat for the enhanced mesh applied type was by
at cooling mode, and was by
at heating mode, after about 30 minutes, respectively. Also, it is possible to provide rapid thermal comfort to passengers sitting on the seat in the vehicle cabin by using the proposed climate control seat.
Analysis Model Development for Component Design of the Fuel Injection System for CRDI Engines
Jang, Joo-Sup ; Yoon, Young-Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 117~126
A Common-Rail Direct Injection(CRDI) system for high speed diesel engines was developed to meet reductions of noise and vibration, and emission regulations. In this study, CRDI system analysis model which includes fuel and mechanical sub-systems was developed using commercial software, AMESim in order to predict characteristics for various fuel injection components. Each component which constructs system was modeled and verified by sub-model of AMESim obtained characteristics curves of each components. The parameter sensitivity analysis such as throttle size, injection rate, plunger displacement, supply pressure of fuel injection for system design were carried out by the analysis.
OSEK PS Kernel Mechanisms for Reducing Dynamic Memory Usage
Lim, Jin-Tack ; Keum, Han-Hong ; Park, Ji-Yong ; Hong, Seong-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 127~141
While the ever-increasing complexity of automotive software systems can be effectively managed through the adoption of a reliable real-time operating system (RTOS), it may incur additional resource usage to a resultant system. Due to the mass production nature of the automotive industry, reducing physical resources used by automotive software is of the utmost importance for cost reduction. OSEK OS is an automotive real-time kernel standard specifically defined to address this issue. Thus, it is very important to develop and exploit kernel mechanisms such that they can achieve minimal resource usage in the OSEK OS implementation. In this paper, we analyze the task subsystem, resource subsystem, application mode and conformance classes of OSEK OS as well as the OSEK Implementation Language (OIL). Based on our analysis, we in turn devise and implement kernel mechanisms to minimize the dynamic memory usage of the OSEK OS implementation. Finally, we show that our mechanisms effectively reduce the memory usage of OSEK OS and applications.
Performance of LNT Catalyst according to the Supply Condition of Hydrogen Reductants for Diesel Engine
Park, Cheol-Woong ; Kim, Chang-Gi ; Choi, Young ; Kang, Kern-Yong ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 3, 2009, Pages 142~148
The direct injection(DI) diesel engine has become a prime candidate for future transportation needs because of its high thermal efficiency. However, nitrogen oxides(NOx) increase in the local high temperature regions and particulate matter (PM) increases in the diffusion flame region within diesel combustion. Therefore, the demand for developing a suitable after treatment device has been increased. NOx absorbing catalysts are based on the concept of NOx storage and release making it possible to reduce NOx emission in net oxidizing gas conditions. This De-NOx system, called the LNT(Lean NOx Trap) catalyst, absorbs NOx in lean exhaust gas conditions and release it in rich conditions. This technology can give high NOx conversion efficiency, but the right amount of reducing agent should be supplied into the catalytic converter at the right time. In this research, a performance characteristics of LNT with a hydrogen enriched gas as a reductant was examined and strategies of controlling the injection and rich exhaust gas condition were studied. The NOx reduction efficiency is closely connected to the injection timing and duration of reductant. LNT can reduce NOx efficiently with only 1 % fuel penalty.