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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 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
Analytical Assessment on the Cooling Structure of In-wheel Driving Inverter
Kim, Sung Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 1~6
DOI : 10.7467/KSAE.2014.22.2.001
In-wheel driving inverter inside engine room sometimes operates in the harsh environment like high temperature of about
. Especially, the size and power density of the inverter has become smaller and more increased. Thus, it is essential to manage the temperature of the inverter with IGBT (Insulated Gate Bipolar Transistor) switching devices for performance and endurance, because the temperature can be getting increase. In this paper, we performed the thermal flow analysis of inverter models with wave type and pin fin type cooling channels, and investigated the heat transfer characteristics of the inverter models using cooling water on channels at 8 L/min and
. Also, we compared the thermal performance under various conditions such as coolant flow rate and layered power module structure. Therefore, we determined the feasibility of the initial inverter models and the thermal performance enhancement.
Development of Injection Molding Machine Simulation Model Based on Hydraulic Circuit, and Operating Characteristic Examination
Noh, Daekyung ; Jang, Joosup ; Uh, Seungyong ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 7~16
DOI : 10.7467/KSAE.2014.22.2.007
Vehicle industry is developing research for producing high quality injection molded product. The main objective of this study is providing information about hydraulic system for researchers who are involved in the other fields, not hydraulic field. Another objective is developing hydraulic circuit simulation model which analyzes the cause of several destabilizing elements related to quality of injection molded products. Injection molded product consists of a lot of hydraulic parts, and there are many nonlinear facts for dynamic behavior. So, we used `SimulationX` which is specialized in hydraulic system for developing simulation model.
Air Intake Door Control for the High Air Conditioning Performance
Park, Dongkyou ; Kim, Yongchul ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 17~22
DOI : 10.7467/KSAE.2014.22.2.017
Recently, the quick heating performance is an important issue in the car because engine power becomes so high. So car makers have been adapted the additional heating devices as like PTC(Positive Temperature Coefficient) heater. And the quick cooling performance is also important issue because its result is used in the IQS(Initial Quality Study). In this paper, control of the HVAC(Heating, Ventilation and Air Conditioning) intake door has been studied for the quick heating and cooling performance. Heating performance is improved
ambient temperature after 20 minutes. And cooling performance is improved
ambient temperature after 10 minutes. In addition, intake door control system brings on the cost reduction because the flab door can be eliminated. This intake door control system has been adapted to the new developing cars.
Study on Thermal Stress and Flow Analysis at Exhaust Manifold of Car
Cho, Jaeung ; Han, Moonsik ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 23~28
DOI : 10.7467/KSAE.2014.22.2.023
This study investigates fluid flow and thermal stress at automotive exhaust manifolds as model 1 and 2. The maximum displacements happen at joint part connected with 4 pipes and upper middle of both parts in cases of model 1 and 2 respectively. At inner surface of the part connected with engine, maximum equivalent stresses of 991.85 and 698.96 MPa are shown in cases of model 1 and 2 respectively. As maximum velocities at the outlet at model 1 are shown at 19.46 and 14.61 m/s in cases of model 1 and 2 respectively, model 1 has more pressure drop than model 2. As result, model 2 has less pressure drop than 1. Model 2 has less deformation and stress than model 1. Model 2 has also less pressure drop than model 1. Therefore model 2 has more strength durability than model 1. This study result is applied with the design of safe automotive manifold and it can be useful to improve the durability by predicting prevention against the deformation due to exhaust gas.
A Study on the Construction of the Database Structure for the Korea In-depth Accident Study
Kim, Siwoo ; Lee, Jaewan ; Youn, Younghan ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 29~36
DOI : 10.7467/KSAE.2014.22.2.029
The accident statistics use the data from police accident reports and statistics. Although the official accident statistics are useful, they provide very limited information about how accidents occur, the cause of the accident and the injury mechanisms. This limitations could be overcome by carrying out the in-depth accident study and analysing investigations, collecting more detailed information. Meanwhile a net of in-depth investigation teams are operating worldwide, such as NASS (National Accident Sampling System) and CIREN (Crash Injury Research and Engineering Network) in US, OTS (On the spot investigation) in UK. In this study, the database structure and variables of Korea in-depth accidents investigation system would be proposed through considering the database structure of GIDAS (Germany In-Depth Accidents Study). GIDAS is one of the best system on the in-depth accident study system in the world. GIDAS was established in 1999 as a cooperation project between Federal Highway Research Institute of Germany (BASt) and research association on automotive engineering of German Car Industry(FAT). The iGLAD (Initiative for the Global Harmonization of Accident Data) was also considered to introduce into the database variables of Korea in-depth accident study. Current police reports were compared with GIDAS and iGLAD. To collaborate of the Worldwide in-depth accident data, this paper proposed that the database of Korea in-depth accident study would be introduced the structure of GIDAS and the core variables of iGLAD. Harmonization of the structures and core variables of Korea in-depth accident study will be better than the making unique ones. The database structure and core variables of KIDAS(Korea In-Depth Accident Study) introduced of GIDAS and iGLAD.
The Effect of Olefin Contents on Exhaust Emissions from Gasoline Vehicles
Park, Cheonkyu ; Jung, Choongsub ; Na, Byungki ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 37~43
DOI : 10.7467/KSAE.2014.22.2.037
Exhaust emissions were studied as a function of gasoline olefin composition in two vehicles-MPI and GDi engine equipped vehicles. Three different gasolines were tested which varied in olefin contents-12, 16 and 20 vol%. Exhaust emissions in two vehicles were affected by changes in gasoline olefin composition. Responses to changes in olefins were similar in both vehicles : reducing olefins lowered emissions of NOx and CO. Measured exhaust emissions included total hydrocarbons (THC), oxides of nitrogen (NOx), carbon monooxide(CO), carbon dioxide(
), formaldehyde, benzene, toluene, xylene, 1,3-butadiene and acetylene.
A Study on the Characteristics of Battery SOC Management for SUV Extended Range EV
Jeong, Taecheol ; Kim, Jaehwan ; Kim, Seonkyung ; Sun, Jin ; Kim, SeokMyung ; Kang, Dongwoo ; Noh, Yunjoo ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 44~51
DOI : 10.7467/KSAE.2014.22.2.044
This paper describes system definition of the extended range EV and presents cruising strategy of EV mode and ER mode. Also high voltage battery strategic SOC could be indicated and compared depends on various generator working cycles. A C-segment SUV has been produced and carried out cruising test in order to validate on highway, city and hill climbing road. This paper shows advantages and disadvantages of SOC variation on each road environments and presents the strategies as the cruising test results. On the basis of the test result, this paper suggests future works and research directions for strategy of battery management to extended range EV.
Crash Performance of Front Side Member Impacted with Angle
Kang, Sungjong ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 52~59
DOI : 10.7467/KSAE.2014.22.2.052
Front impacted SUV vehicle shows that the front parts of side members are collapsed by the bending due to the transverse load exerted at the end of side members. Side member models were impacted with various angles in order to study the crash performance according to the impact angle. Even for the small impact angle of
, crash performance seriously deteriorated and the deformations for impact angle
were similar to those from the front body impact analysis. In addition, the angled front impact analysis for the straight member with hat section was carried out and the effects of inner reinforcement shape on crash performance was investigated.
Control Oriented Storage and Reduction Modeling of the Lean NO
Lee, Byoungsoo ; Han, Manbae ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 60~66
DOI : 10.7467/KSAE.2014.22.2.060
A control oriented model of the Lean
trap (LNT) was developed to determine the timing of
regeneration. The LNT model consists of
storage and reduction model. Once
is stored (
storage model), at the right timing
should be released and then reduced (
reduction model) with reductants on the catalyst active sites, called regeneration. The
storage model simulates the degree of stored
in the LNT. It is structured by an instantaneous
storage efficiency and the
storage capacity model. The
storge capacity model was modeled to have a Gaussian distribution with a function of exhaust gas temperature.
release and reduction reactions for the
reduction model were modeled as Arrhenius equations. The parameter identification was optimally performed by the data of the bench flow reactor test results at space velocity 50,000/hr, 80,000/hr, and temperature of
. The LNT model state, storage fraction indicates the degree of stored
in the LNT and thus, the timing of the regeneration can be determined based on it. For practical purpose, this model will be verified more completely by engine test data which simulate the NEDC transient mode.
The Study for Effect of Biodiesel Antioxidants on Properties and Emissions
Kang, Hyungkyu ; Song, Hoyoung ; Park, Sooyoul ; Oh, Sangki ; Na, Byungki ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 67~75
DOI : 10.7467/KSAE.2014.22.2.067
Biodiesel as alternative fuels has been widely studied due to biodiesel merits such as lower sulfur, lower aromatic hydrocarbon and higher oxygen content. But biodiesels could be easily oxidized by several conditions. In this study, various antioxidants such as propyl gallate, TBHA, TBHQ, DTBHQ, butyl-amin, aniline and pyrogallol were added in the biodiesel produced by the used cooking oil, then the material property test and the vehicle emissions test were conducted in accordance with test method. From the results of material property test, all antioxidants were suitable for the quality standard of density and kinematic viscosity, but Propyl gallate and Pyrogallol, as a type of Gallate additives, showed that the result of TAN increased rapidly according to the increase of the amount of additives. In the oxidation stability test, TBHQ, Butyl-amine and Aniline showed the excellent oxidation stability. Also, when considering the material property test, TBHQ was verified to the most excellent additives. In case of the vehicle emissions test, the testing was conducted by using the biodiesel added by TBHQ and was conducted by using two light duty diesel vehicles suitable for the EURO 4 and EURO 5 emission regulation. The result of testing showed that when the TBHQ was added, the amounts of CO, NOx and NMHC+NOx were decreased but the amount of
Optimal Power Distribution for an Electric Vehicle with Front In-line Rear In-wheel Motors
Kim, Jeongmin ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 76~82
DOI : 10.7467/KSAE.2014.22.2.076
In this paper, an optimal power distribution algorithm is proposed for the small electric vehicle with front in-line and rear in-wheel motors. First, it is assumed that the vehicle driving torque and velocity are given conditions. And, an optimal problem is defined that finding the front and rear motor torques which minimizes the battery power. From the above optimization problem, the optimized front-rear motor torque distribution map is obtained. And, the vehicle simulations are performed to verify the performance of the optimal power distribution algorithm which is proposed in this study. The simulations are performed based on the federal urban driving schedule for two cases which are constant ratio power distribution, and optimal power distribution. From the simulation results, it is found that the optimal power distribution shows the 6.3% smaller battery energy consumption than the constant ratio power distribution.
The Effect of Control of Low Temperature Oxidation using DME-gasoline Fuel Mixture on the HCCI Combustion
Park, Youngjin ; Lim, Ocktaeck ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 83~90
DOI : 10.7467/KSAE.2014.22.2.083
The main purpose of the study is to investigate the ideal manner and ratio to inject gasoline and DME simultaneously into intake port, and moreover to confirm the characteristics of combustion and emission of engine. Experimental conditions are 1200 rpm, compression ratio 8.5, intake air temperature (383 K). Internal cylinder pressure was collected to confirm the characteristics of combustion in order to calculate the heat release rate in the cylinder. In addition, HORIBA (MEXA 7100) which was possible analyzing emissions (NOx, CO, HC) was used. Vanguard gasoline engine (23HP386447) was used in this experiment. The result show that fuel design (DME-Gasoline) leads to the decrease of low temperature heat release, which is a benefit for higher-load on the HCCI engine. Also, IMEP and the indicated thermal efficiency increase with combustion-phasing retard, and these observations can be explained by considering the control of low temperature oxidation of DME.
A Numerical Study on the Geometry Optimization of Internal Flow Passage in the Common-rail Diesel Injector for Improving Injection Performance
Moon, Seongjoon ; Jeong, Soojin ; Lee, Sangin ; Kim, Taehun ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 91~99
DOI : 10.7467/KSAE.2014.22.2.091
The common-rail injectors are the most critical component of the CRDI diesel engines that dominantly affect engine performances through high pressure injection with exact control. Thus, from now on the advanced combustion technologies for common-rail diesel injection engine require high performance fuel injectors. Accordingly, the previous studies on the numerical and experimental analysis of the diesel injector have focused on a optimum geometry to induce proper injection rate. In this study, computational predictions of performance of the diesel injector have been performed to evaluate internal flow characteristics for various needle lift and the spray pattern at the nozzle exit. To our knowledge, three-dimensional computational fluid dynamics (CFD) model of the internal flow passage of an entire injector duct including injection and return routes has never been studied. In this study, major design parameters concerning internal routes in the injector are optimized by using a CFD analysis and Response Surface Method (RSM). The computational prediction of the internal flow characteristics of the common-rail diesel injector was carried out by using STAR-CCM+7.06 code. In this work, computations were carried out under the assumption that the internal flow passage is a steady-state condition at the maximum needle lift. The design parameters are optimized by using the L16 orthogonal array and polynomial regression, local-approximation characteristics of RSM. Meanwhile, the optimum values are confirmed to be valid in 95% confidence and 5% significance level through analysis of variance (ANOVA). In addition, optimal design and prototype design were confirmed by calculating the injection quantities, resulting in the improvement of the injection performance by more than 54%.
Reliability-based Design Optimization for Lower Control Arm using Limited Discrete Information
Jang, Junyong ; Na, Jongho ; Lim, Woochul ; Park, Sanghyun ; Choi, Sungsik ; Kim, Jungho ; Kim, Yongsuk ; Lee, Tae Hee ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 100~106
DOI : 10.7467/KSAE.2014.22.2.100
Lower control arm (LCA) is a part of chassis in automotive. Performances of LCA such as stiffness, durability and permanent displacement must be considered in design optimization. However it is hard to consider different performances at once in optimization because these are measured by different commercial tools like Radioss, Abaqus, etc. In this paper, firstly, we construct the integrated design automation system for LCA based on Matlab including Hypermesh, Radioss and Abaqus. Secondly, Akaike information criterion (AIC) is used for assessment of reliability of LCA. It can find the best estimated distribution of performance from limited and discrete stochastic information and then obtains the reliability from the distribution. Finally, we consider tolerances of design variables and variation of elastic modulus and achieve the target reliability by carrying out reliability-based design optimization (RBDO) with the integrated system.
Performance Improvement of PMSM Current Control using Gain Attenuation and Phase Delay Compensated LPF
Kim, Minju ; Choi, Chinchul ; Lee, Wootaik ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 107~114
DOI : 10.7467/KSAE.2014.22.2.107
This paper applies a compensated low pass filter (LPF) to current measurements for permanent magnet synchronous motor (PMSM) drives. The noise limits the bandwidth of current controllers and has more adverse influences on control performances under the light load condition because of the low signal-to-noise ratio. In order to eliminate the noise sensitivity, this paper proposes a digital LPF with a compensator of gain attenuation and phase delay which are unacceptable in current information for PMSM drives. Characteristics of the proposed LPF are analyzed in comparison with the general LPFs. The compensated LPF is basically designed by the orthogonal property of the measured currents in the
stationary reference frame. In addition, an implementation issue of the proposed method is discussed. Experimental results using the proposed method show improvements of the current control performance from two perspectives, rapid step responses and reductions of harmonic distortion.
Optimization of Valve Gates Locations Using Automated Runner System Modeling and Metamodels
Joe, Yong-Su ; Park, Chang-Hyun ; Pyo, Byung-Gi ; Rhee, Byung-Ohk ; Choi, Dong-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 115~122
DOI : 10.7467/KSAE.2014.22.2.115
Injection pressure is one of factors that influence part quality. In this paper, injection pressure was minimized by optimizing valve gate locations. In order to perform design optimization, MAPS-3DTM (Mold Analysis and Plastic Solution-3D) was used for injection mold analysis and PIAnOTM (Process Integration, Automation and Optimization) was used as process integration and design optimization. Also we adapted meta models based on design of experiments for efficiency. By using introduced methodology, we were able to obtain a result so that maximum injection pressure reduced by 28% compared to the initial design. And the validity of the proposed method could also be demonstrated.
A Study on Inequality Rate of Integrated Cylinder Lubricator System with an Accumulated Distribution by the Electronic Control in a Large Two-stroke Diesel Engine
Bae, Myung-Whan ; Jung, Hwa ; Kim, Su-Min ; Bae, Chang Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 123~133
DOI : 10.7467/KSAE.2014.22.2.123
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 improving the lubricating system to lubricate cylinder parts optimally by an electronically controlled quill device according to changes of engine load and revolution speed. In order to apply the developed accumulating distributor to an integrated cylinder lubricator by the electronically controlled system as the third research stage, the lubricating system is improved in the electronically controlled quill device with a solenoid valve. In this study, the effects of lubricator revolution speed, driving pressure(or plunger stroke) and cylinder back pressure on oil feed rate and lubrication inequality rate are investigated by using the integrated cylinder lubricator system with an accumulated distribution by the electronic control(I.C.S.), and the oil feed rate and lubrication inequality rate of I.C.S. are compared with those of the motor-driven cylinder lubricator by the electronically controlled quill system equipped with an accumulating distributor(E.D.S.). It is found that the oil feed rate of I.C.S. is smaller than that of E.D.S. due to the reduction of delivery velocity by the higher delivery pressure, and the variances of lubrication inequality rate for I.C.S. have become smaller than those of E.D.S. as the driving pressure in all experimental conditions increases, except for the driving pressure of 26 bar(plunger stroke 2 mm) at the cylinder lubricator speed of 120 rpm.
Reviews on Very High Cycle Fatigue Behaviors of Structural Metals
Han, Seung-Wook ; Park, Jung-Hoon ; Myeong, No-Jun ; Choi, Nak-Sam ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 134~140
DOI : 10.7467/KSAE.2014.22.2.134
The paper presents an overview of the present state of study on the fatigue behaviors at very high number of cycles (
). A classification of materials with typical S-N curves and influencing factors such as notches, residual stresses, temperatures, corrosion environments and stress ratios are given. The microstructural inhomogeneities of materials and micro-cracks played an important roles in very high cycle fatigue behaviors. The failure mechanisms for the fatigue design of materials and components are mentioned.
Role of Bevel Angles Influenced on the Fatigue Life of Butt-welded Joints
Park, Jihwan ; Han, Changwan ; Jung, Seungbin ; Park, Seonghun ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 141~147
DOI : 10.7467/KSAE.2014.22.2.141
This study aims to investigate the influence of bevel angles on the fatigue life of V-groove butt-welded joints with back-plates made by SM490A steel material, generally used for excavators, because changes in the geometry, material and surface properties of welded regions affect the fatigue life of welded structures. Butt type test specimens were prepared by the
welding of rolled steel plates (SM50A steel) with a thickness of 13.5 mm at a welding speed of 30 cm/min and these Butt type test specimens had two different groove angles, which are
(A type) and
(B type). In order to investigate differences in fatigue life between two types, 4-point bending fatigue tests were conducted with a stress ratio of R
Analysis of the Truck Fire Caused by Return Spring Defect of a Braking System during Expressway Driving
Kim, Younhoi ; Lee, Euipyeong ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 148~155
DOI : 10.7467/KSAE.2014.22.2.148
Most truck fires breaking out on the expressway are directly damaged by fire destruction of truck and freight and many of them cause indirect damage such as serious traffic holdups. This study analyzed the fire causes and their liability of the 25-ton truck fire breaking out during expressway driving. This truck fire was caused by manufacturing defect of return spring of a braking system. The fire liability rested with a maker(manufacturer) rather than a truck owner or a driver and the maker also bore fire liability based on the Product Liability Law.
Effect of Intake Flow Control Method on Part Load Performance in SI Engine(1) - Comparison of Throttling and Masking
Kang, Min Gyun ; Ohm, Inyong ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 156~165
DOI : 10.7467/KSAE.2014.22.2.156
This paper is the first investigation on the effect of flow control methods on the part load performance in a spark ignition engine. For comparison of the methods, two control devices, port throttling and masking, were applied to a conventional engine without any design change of the intake port. Steady flow evaluation shows that steady flow rates per unit opening area and swirl ratio are very low compared with the port throttling and saturated from mid-stage valve lift, however, swirl increases slightly as the lift is higher in case of 1/4 masking control. In the part load performance, the effect of simple port throttling on lean misfire limit expansion is limited and insufficient; on the other hand a masking improves the limit considerably without any port modification for increasing swirl. Also the results show that the intake flow control improves the combustion with following two mechanisms: stratification induced by the combination of the flow pattern and the fuel injection timing attribute to ignition ability and the intensified flow ensure fast burn. In addition fuel consumption reduces under the flow controls and the reduction rate is different according to the operation conditions and control methods. At the Stoichiometric and/or low speed and low load the throttling method is more advantageous; however vice versa at lean and high load condition. Finally, the throttling is more efficient for HC reduction than masking, on the other side the NOx emissions increase under the masking and decrease under the port throttling compared with conventional port scheme.
Study on the Application of the Electric Drive System of Fuel Pump for Diesel Engine of Commercial Vehicle using HILS
Ko, Youngjin ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 166~174
DOI : 10.7467/KSAE.2014.22.2.166
Fuel injection pressure has steadily increased in diesel engines for the purpose of improving fuel efficiency and cleaning exhaust gas, but it has now reached a point, where the cost for higher pressure does not warrant additional gains. Common rail systems on modern diesel engines have fuel pumps that are mechanically driven by crankshaft. The pumps actually house two pumping module inside: a low pressure pump component and a high pressure pump component. Part of the fuel compressed by the low pressure component returns to the tank in the process of maintaining the pressure in the common rail. Since the returning fuel represents pumping loss, fuel economy improves if the returned fuel can be eliminated by using a properly controled electrical fuel pump. As the first step in developing an electrical fuel pump the fuel supply system on a 6 liter diesel engine was modeled with AMESim to analyze the workload and the fuel feed rate of the injection pump, and the results served as basis for selecting a suitable servo motor and a reducer to drive the pump. A motor controller was built using a DSP and a program which controls the common rail pressure using a proportional control method based on the target fuel pressure information from the engine ECU. A test rig to evaluate performance of the fuel pump is implemented and used to show that the newly developed electrically driven fuel pump can satisfy the fuel flow demand of the engine under various operating conditions when the rotational speed of the pump is adequately controlled.
Analytical Model for the Analysis of Pop-up Deviation of the Trunk Lid with Torsion Bar
Son, Sungmin ; Yun, Jaedeuk ; Jung, Yoongho ; Yim, Hyangsoo ; Jang, Kookjin ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 175~181
DOI : 10.7467/KSAE.2014.22.2.175
A four-link mechanism consisting of torsion bars is used for opening the trunk lid in most midsize sedans. When the weight of the lid is in equilibrium with the spring force exerted by torsion bars, the lid stops opening at a pop-up height. However, the actual pop-up height has large deviations from the specified height even with the same parts in the same car model, which leads to quality issues. Automotive manufacturers have experienced this deviation problem despite much effort to resolve it. In this research, we developed a multi-body dynamics model for the analysis of pop-up deviation of a trunk lid with torsion bars, which can simulate the actual pop-up motion of the trunk lid by considering kinematic constraints of the motion and friction forces in joints. We could also determine the most important factor that governs the pop-up height by sensitivity analysis of all parts. The developed system can be used for the analysis of other trunk lid systems to control the tolerance of parts.
Dynamic Decoupler Design for EGR and VGT Systems in Passenger Car Diesel Engines
Hong, Seungwoo ; Park, Inseok ; Sohn, Jeongwon ; Sunwoo, Myoungho ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 182~189
DOI : 10.7467/KSAE.2014.22.2.182
This paper proposes a decoupler design method to reduce interaction between exhaust gas recirculation (EGR) and variable geometry turbocharger (VGT) systems in passenger car diesel engines. The EGR valve and VGT vane are respectively used to control air-to-fuel ratio (AFR) of exhaust gas and intake pressure. A plant model for EGR and VGT systems is defined by a first order transfer function plus time-delay model, and the loop interaction between these systems is analyzed using a relative normalized gain array (RNGA) method. In order to deal with the loop interaction, a design method for simplified decoupler is applied to this study. Feedback control algorithms for AFR and intake pressure are composed of a compensator using PID control method and a prefilter. The proposed decoupler is evaluated through engine experiment, and the results successfully showed that the loop interaction between EGR and VGT systems can be reduced by using the proposed decoupler. Furthermore, it presents stable performance even off from the designed operating point.
Study on Analytic of Opening Angles for Muffler Variable Valve of Automobile
Park, Chungyeol ; Kim, Kwonse ; Kim, Jongil ; Choi, Dooseuk ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 2, 2014, Pages 190~196
DOI : 10.7467/KSAE.2014.22.2.190
Exhaust system by reinforcement of environment regulation came to the foe study necessity. And Exhaust system has necessary to increase the engine performance and silence. From this cause, Automobile has significantly considered production expense. this study makes process for checking the characteristics about Exhaust variable valve within muffler. Variable valve might reduce the baffle within muffler, It was possible to remove the front muffler. Therefor, To miniaturize a size of muffler might be increased by performance through cost-cutting effect and controling of back pressure. Because the Study on Variable valve installed within muffler, to measure the real data was hardly resulted one of the assignments. From manufactured conduct device, might measure data one of piece which was up-graded of problem. Considering to these point, stressed pressure distribution has analyzed on cross section, floating characteristics about velocity distribution around variable valve using analysis as computational fluid dynamics of Ansys with completed measurement data.