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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 19, Issue 6 - Nov 2011
Volume 19, Issue 5 - Sep 2011
Volume 19, Issue 4 - Jul 2011
Volume 19, Issue 3 - May 2011
Volume 19, Issue 2 - Mar 2011
Volume 19, Issue 1 - Jan 2011
Selecting the target year
A Study on Reliability Evaluation of Embedded Software in Vehicle
Baek, Jae-Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 1~7
Various convenient systems which are telecommunication and navigation system and safety system which include Antilock Braking System, Electronic Stability Control, Adaptive Cruise Control have been developed and applied to meet customer needs and each standards since vehicles are used. The complexity of new electronics become significant reason of breakdown especially embedded software failures. Hardware reliability is almost stabilized with long history but software reliability needs more improvements through reliability researches. This new challenge will improve software reliability to clear its overall failures in vehicles. This paper introduces some software reliability models and evaluates embedded software reliability using failure data which occurred during operating.
Navigation Technique of Unmanned Vehicle Using Potential Field Method
Lee, Sang-Won ; Moon, Young-Geun ; Kim, Sung-Hyun ; Lee, Min-Cheol ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 8~15
This paper proposes a real-time navigation algorithm which integrates the artificial potential field (APF) for an unmanned vehicle in the unknown environment. This approach uses repulsive potential function around the obstacles to force the vehicle away and an attractive potential function around the goal to attract the vehicle. In this research, laser range finder is used as range sensor. An obstacle detected by the sensor creates repulsive vector. Differential global positioning system (DGPS) and digital compass are used to measure the current vehicle position and orientation. The measured vehicle position is also used to create attractive vector. This paper proposes a new concept of potential field based navigation which controls unmanned vehicle's speed and steering. The magnitude of repulsive force based on the proposed algorithm is designed not to be over the magnitude of attractive force while the magnitude is increased linearly as being closer to obstacle. Consequently, the vehicle experiences a generalized force toward the negative gradient of the total potential. This force drives the vehicle downhill towards its goal configuration until the vehicle reaches minimum potential and it stops. The effectiveness of the proposed APF for unmanned vehicle is verified through simulation and experiment.
Reduction of Exhaust Emissions Using Various Injector Configurations in Low Temperature Diesel Combustion
Jung, Yong-Jin ; Jang, Jin-Young ; Park, Jung-Seo ; Bae, Choong-Sik ; Kim, Duk-Sang ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 16~23
Low temperature combustion is one of the advanced combustion technology in an internal combustion engine to reduce soot and nitrogen oxides simultaneously. In present experiment three kinds of injector were used to investigate the influence of injection angle and number of nozzle holes on the low temperature combustion in a heavy duty diesel engine. Low temperature diesel combustion is realized from the exhaust gas recirculation rate of 60%. Indicated mean effective pressure of low temperature combustion corresponds to the 70% level of conventional diesel engine combustion. Reduction of hydrocarbon and carbon monoxide, which are produced in low temperature combustion because of the low combustion temperature and a deficit of oxygen, was achieved by using various injector configuration. The result of experiment with
injection angle and 8 holes showed that reductions in hydrocarbon and carbon monoxide could be achieved 58% and 27% respectively maintaining the 7% increased indicated mean effective pressure in low temperature diesel combustion compared with conventional injector.
Performance Analysis of a Geometrically Asymmetric Trapezoidal Fin for an Enhanced Heat Exchanger
Song, Nyeon-Joo ; Kang, Hyung-Suk ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 24~31
Performance of the asymmetric trapezoidal fin with various upper lateral surface slopes is investigated by using the two-dimensional analytic method. For a fin base boundary condition, convection from the inner fluid to the inner wall, conduction from the inner wall to the fin base and conduction through the fin base are considered. Heat loss and fin efficiency are represented as a function of the fin base thickness, base height, inner fluid convection characteristic number, fin tip length and fin shape factor. One of the results shows that heat loss increases while fin efficiency decreases as the fin shape factor increases.
The Durability Characteristics for BDF 20% in a Common Rail Diesel Engine
Choi, Seung-Hun ; Oh, Young-Taig ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 32~37
Biodiesel fuel is already remarkable alternative fuel in many countries. So, many studies are performed on the environmental or economic effects as well as the characteristics of diesel engine fueled biodiesel in combustion and emission. In this study, an CRDI diesel engine used to commercial vehicle was fueled with diesel fuel and 20% biodiesel blended fuel (BDF 20%) with city mode in excess of 300 hours. Engine dynamometer testing was completed at regularly scheduled intervals to monitor the engine performance and exhaust emissions. The engine performance and exhaust emissions were sampled at 1 hour interval for analysis. To check the engine parts (valve and injector), the engine was inspected after test. It was concluded that there were no unusual deteriorations of the engine, or any unusual changes in engine power and exhaust emissions in spite of operation of 300 hours with BDF 20%.
Using Lateral Acceleration and Yaw Rate, Sliding Observer Design for Roll Angle
Lee, Jong-Kuk ; Kwon, Young-Shin ; Lee, Hyeong-Cheol ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 38~46
This paper presents roll angle estimator which used Kalman filter. Recently, the uses of the ELSD (Electronic Limited Slip Differential) and TVD(Torque Vectoring Differential) for vehicle yaw control are studied in many researches. However the roll angle can be negative effect of ELSD and TVD control. Therefore the information of roll angle can be used for vehicle yaw control. Moreover it can be used for rollover prevent control. Recently, most of the vehicles use lateral acceleration and yaw rate sensor. In this paper, design of Kalman filter which used lateral acceleration and yaw rate information is developed. In this paper, in order to verify the estimator ability, the CarSim and Matlab/Simulink are used.
Stiffness and Fatigue Strength Analysis of Fuel Cell Vehicle Body Frame
Choi, Bok-Lok ; Kang, Sung-Jong ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 47~53
Firstly, FEM model for the body frame of a fuel cell vehicle was built up and design optimization results based on different schemes were exhibited. One scheme was to minimize weight while maintaining the normal mode frequencies and the other was to increase the frequencies without weight change. Next, for a rear frame model, shape parameter study on collapse characteristics such as peak resistance load and absorbed energy was carried out. Also, the stiffness of frame mounting brackets was predicted using inertance calculation and the durability of those mounting brackets for vehicle system loads was evaluated. Finally, for a representative mounting model, the influence on durability due to thickness change was analyzed.
Developing an In-vehicle Network Education System Based on CAN
Lee, Byoung-Soo ; Park, Min-Kyu ; Sung, Kum-Gil ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 54~63
An educational network system based on CAN protocol internal to a passenger ground vehicle has been developed. The developed network system has been applied to a commercial plug-in electrical vehicle and verified the educational applicability. To apply this in-vehicle network technology based on CAN, a suitable electric vehicle has been chosen and a CAN network structure has been designed, developed and manufactured. Since the commercial electric vehicle chosen as a test bed has its own proprietary electric network, we explain how the original electric network has been utilized and how the new network system has been designed. The developed network system on a real vehicle has been tested to show the applicability and the performance. Finally, the system has been applied at few classrooms to demonstrate how the in-vehicle network system works and to teach how to analyse the CAN signals. The developed system proven to be effective for educational purpose.
A Study on the Detailed Diesel Surrogate Chemical Mechanism for Analysis of HCCI Engine
Lee, Won-Jun ; Lee, Seung-Ro ; Lee, Chang-Eon ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 64~71
Homogeneous charge compression ignition (HCCI) was the best concept able to provide low NOx and PM in diesel engine emissions. This new alternative combustion process was mainly controlled by chemical kinetics in comparison with the conventional combustion in internal combustion engine. In this paper, detailed kinetic reaction mechanisms of diesel surrogate was investigated to understand the diesel HCCI engine combustion. It was tested two existing mechanisms and two new mechanisms for the comparison of experimental result. The best mechanism for diesel surrogate was suggested through this comparison.
The Effect of T90 Temperature on Exhaust Emissions in Low-temperature Diesel Combustion
Han, Man-Bae ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 72~77
This study is to investigate the effect of the distillation temperature in ultra low sulfur diesel fuel on exhaust emissions in the low-temperature diesel combustion with 1.9L common rail direct injection diesel engine. Low temperature diesel combustion was achieved by adopting an external high EGR rate with a strategic injection control. The engine was operated at 1500 rpm 2.6 bar BMEP. The 90% distillation recovery temperature (T90) was
for the respective cetane number (CN) 30 and 55. It was found that there exists no distinctive discrepancy on exhaust emissions with regards to the different T90s. The high CN (CN55) fuels follow the similar trend of exhaust emissions as observed in CN30 fuels' except that high T90 fuel (CN55-T340) produced higher PM compared to low T90 fuel (CN55-T270). This may come from that high T90 plays an active role in aggravating the degree of fuel-air mixture preparedness before ignition.
A Study on the NOx Emission Characteristics of HCNG Engine
Park, Cheol-Woong ; Kim, Chang-Gi ; Choi, Young ; Won, Sang-Yeon ; Lee, Sun-Youp ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 78~83
Natural gas is one of the most promising alternatives to gasoline and diesel fuels because of its high thermal efficiency and lower harmful emissions, including
. Although the high octane value of natural gas increases engine output and efficiency due to the high compression ratio, this fuel is prone to such difficulties as a narrow limit of inflammability and a slow combustion speed in the lean burn operation domain, leading to unstable combustion and higher emissions of harmful exhaust gases. Hydrogen blended with natural gas can extend the lean burn limit while maintaining stable, efficient combustion and achieving lower NOx, hydrocarbon and green house gas emissions. In this study, the effect of hydrogen addition on an engine performance and NOx emission characteristics was investigated in a heavy duty natural gas engine. The results showed that thermal efficiency was increased and NOx emissions were reduced due to the expansion of lean operation range under stable operation. NOx emission can be significantly reduced with the retard of spark advance timing.
Design of Fuzzy Logic Adaptive Filters for Active Mufflers
Ahn, Dong-Jun ; Park, Ki-Hong ; Kim, Sun-Hee ; Nam, Hyun-Do ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 84~90
In active noise control filter, LMS algorithms which used for control filter, assure the convergence property, and computational burden of these algorithms are proportionate to the filter taps. The convergence speed of LMS algorithms is mainly determined by value of the convergence coefficient, so optimal selection of the value of convergence coefficient is very important. In this paper, We proposed novel adaptive fuzzy logic LMS algorithms with FIR filter structure which has better convergence speed and less computational burden than conventional LMS algorithms, for single channel active noise control with ill conditioned signal case. Computer simulations were performed to show the effectiveness of a proposed algorithms.
A Study on Feed Rate Characteristics of Motor-driven Cylinder Lubricator by the Electronically Controlled Quill System Equipped with an Accumulating Distributor in a Large Two-stroke Diesel Engine
Bae, Myung-Whan ; Jung, Hwa ; Bae, Chang-Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 91~98
Minimizing the cylinder wear and the consumption rate of cylinder oil in a large two-stroke diesel engine is of great economic importance. A motor-driven cylinder lubricator for Sulzer RT-flex large two-stroke diesel engines developed by authors is in need of mounting a quill system to lubricate cylinder parts for smoother operation. In order to apply the common-rail lubricating system to the developed cylinder lubricator as the second research stage, the quill system with a progressively quantitative distributor is improved in the electronically controlled quill system with an accumulating distributor. In this study, the effects of lubricator motor speed, plunger stroke and cylinder back pressure on oil feed rate, maximum discharge and delivery pressures are experimentally investigated by using the electronically controlled quill system with an accumulating distributor in the developed cylinder lubricator. It is found that the oil feed rate of the electronically controlled quill system with an accumulating distributor is larger than that of the quill system with a progressively quantitative distributor because of the increase of delivery speed and volume by changing the location of accumulator in the same experimental condition.
Engine Room Layout Design Optimization of Fuel Cell Vehicle Using CFD Technique
Kim, Jung-Ill ; Jeon, Wan-Ho ; Cho, Jang-Hyung ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 99~106
This paper deals with engine room layout design optimization of fuel cell electric vehicle (FCEV), which has been proposed as a potential alternative to fossil fuel depletion. Investing the great R&D efforts, the global vehicle manufacturers, especially Honda motor corporate, have shown not prototype vehicle but commercial vehicle using fuel cell in the market recently. In this paper, we analyze cooling performance and flow characteristic in the engine room of newly FCEV, in addition we suggest the optimization process for engine room layout design optimization. The two radiators in the vehicle for fuel cell stack and electronic components cooling have been analyzed and their performance are obtained in terms of cooling performance ratio (CPR). The value of CPR should always be less than one and based on criteria, we have achieved the optimum cooling performance of radiators for stack and electronic components. Aerodynamic performance is evaluated in terms of drag coefficient, improved through underbody modification using air devices.
An Electro-chemical Combined-stress Degradation Test of Rubber for Automotive Radiator Hoses
Kwak, Seung-Bum ; Seo, Boo-Seok ; Choi, Nak-Sam ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 107~113
Coolant rubber hoses for automotive radiators under thermal and mechanical loadings can be degraded and thus failed due to the influences of the locally formed electricity. In this study, an advanced test method was developed to simulate the failure problem of the rubber hose. For carbon black filled EPDM (ethylene-propylene dine monomer) rubber used as a radiator hose material the ageing behaviors by the electro-chemical stresses combined with a tensile strain were analyzed. As the tensile strain increased, the current of the rubber specimen reduced indicating an increase of the internal defects and electrical resistance of the rubber specimen. Elongation at break and IRHD hardness rapidly decreased with increasing the ageing time. Both electro-chemical stress and mechanical tensile stress clearly accelerated the degradation of EPDM rubber.
A Study on Reductions of Cold Start Emissions with Syngas Assist in an SI Engine
Song, Chun-Sub ; Ka, Jae-Geum ; Hong, Woo-Kyung ; Park, Jeoung-Kwon ; Cho, Yong-Seok ; Kim, Chang-Gi ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 114~120
Fuel reforming technology for the fuel cell vehicles has been frequently applied to internal combustion engine for the reduction of engine out emissions. Since syngas which is reformed from fossil fuel has hydrogen as a major component, it has abilities to enhance the combustion characteristics with wide flammability and high speed flame propagation. In this paper, syngas was feed to a 2.0 liter SI engine with MPI to improve exhaust emissions under cold start and early state of idle condition. Syngas fraction is varied to 0%, 10%, 25%, with various ignition timings. Exhaust emission characteristics and the exhaust system temperature were measured to investigate the effects of syngas addition on cold start. Result showed that HC emission could be dramatically reduced due to the fact that syngas has
and no HC as components. The amount of
emission was decreased with the increase of syngas fraction. Because the dilution effect of
and the retard of ignition timing reduces the peak combustion temperature inside the cylinder. Exhaust gas temperature was lower than that of gasoline feeding condition. Retarded ignition timing, however, resulted in increased exhaust gas temperature approximated to gasoline condition. It is supposed that the usage of syngas in an SI engine is an effective solution to meet the future strict emission regulations.
A Study on the Evaporative Emission Characteristics of Korean Gasoline Vehicles
Park, Jun-Hong ; Park, Young-Pyo ; Lim, Yun-Sung ; Lee, Jong-Tae ; Kim, Jung-Su ; Choi, Kwang-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 121~129
Hydrocarbons which are the main sources of VOCs from motor vehicles are emitted not only from the engine exhaust gas but also from evaporation of the fuel in storage and supplying systems. Evaporative emissions from gasoline fuel systems could be classified by diurnal, hotsoak and running loss. Diurnal loss test procedures are different as countries. Korea introduced new evaporative regulation in 2009 with 24hour VT-shed test procedure and relaxed emission standards. The estimations on different test procedures in this study show that the new Korean regulation get a little more severe than before and the 2 day diurnal loss test of U.S. is the most severe. So the test procedures as well as the stronger standards should be considered in the next evaporative emission regulation to reduce VOCs from motor vehicles. The important parameters to affect evaporative emissions are air and fuel temperature and fuel vapor pressure. Diurnal loss increases exponentially as rising air temperature and vapor pressure. The effects of vapor pressure on running loss are different as the capacities of canisters. Tests with simulating real temperature and driving conditions show that hydrocarbons in evaporative emissions could be more than those in exhaust gas in summer season because of the higher air temperature.
Combustion and Emission Characteristics of Biodiesel Blended Fuel by EGR Rate in a 4-cylinder CRDI Diesel Engine
Jeong, Kyu-Soo ; Lee, Dong-Gon ; Youn, In-Mo ; Roh, Hyun-Gu ; Park, Sung-Wook ; Lee, Chang-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 130~136
This study describes the effect of EGR rate on the combustion and emissions characteristics of a four cylinder CRDI diesel engine using biodiesel (soybean oil) blended diesel fuel. The test fuel is composed of 30% biodiesel and 70% ULSD (ultra low sulfur diesel) by volumetric ratio. The experiment of engine emissions and performance characteristics were performed under the various EGR rates. The experimental results showed that ignition delay was extended, the maximum combustion pressure and heat release gradually were decreased with increasing EGR rate. Comparing biodiesel blended fuel to ULSD, the injection quantity of biodiesel blended fuel was further increased than ULSD. The emission results showed that
emission of biodiesel blended fuel becomes higher according to the increase of EGR rate. However, in the case of biodiesel blended fuel, HC, CO and soot emissions were decreased compared to ULSD.
Effects on Aerodynamic Drag Reduction of a Passenger Car by Rear Body Shape Modifications
Song, Ki-Sun ; Kang, Seung-On ; Jun, Sang-Ook ; Park, Hoon-Il ; Kee, Jung-Do ; Kim, Kyu-Hong ; Lee, Dong-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 137~145
This paper suggests possible rear body shape modifications of a passenger car for the improvement of aerodynamic performance, based on the CFD analysis results. YF SONATA, a passenger car of Hyundai Motors Company, plays a major role as the baseline car in this research. Representatively, three parts(trunk rear edge, side rear edge and rear undercover) are modified in a small range in order for the total outer shapes not to be changed enough so that the modified car is not considered different, compared with the baseline. Specifically, using computational fluid dynamics, aerodynamic drag reduction is accomplished maximally about 11% in this research. Finally, it is proved that although the range of changes of the rear body shapes of a passenger car is very strictly confined, by changing a small range of rear body shapes alone the enhancement of aerodynamic performance of a passenger car can be significantly accomplished.
Development of an Autonomous Vehicle: A1
Chu, Keon-Yup ; Han, Jae-Hyun ; Lee, Min-Chae ; Kim, Dong-Chul ; Jo, Ki-Chun ; Oh, Dong-Eon ; Yoon, E-Nae ; Gwak, Myeong-Gi ; Han, Kwang-Jin ; Lee, Dong-Hwi ; Choe, Byung-Do ; Kim, Yang-Soo ; Lee, Kang-Yoon ; Huh, Kun-Soo ; SunWoo, Myoung-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 19, issue 4, 2011, Pages 146~154
This article describes the Autonomous Vehicle #1 (A1), which won the 2010 Autonomous Vehicle Competition (AVC) organized by Hyundai Kia automotive group. The A1 was developed for high speed and stable driving without human intervention. The autonomous system of A1 was developed based on in-vehicle networks, electronic control units, and embedded software. Novel environment perception and navigation algorithm were evaluated and validated through the AVC. In this paper, we presented the system and software architecture of A1.