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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 21, Issue 6 - Nov 2013
Volume 21, Issue 5 - Sep 2013
Volume 21, Issue 4 - Jul 2013
Volume 21, Issue 3 - May 2013
Volume 21, Issue 2 - Mar 2013
Volume 21, Issue 1 - Jan 2013
Selecting the target year
The Effect of Cooling Fan Control on Fuel Economy of City Bus
Kim, Kibok ; Park, Jinil ; Lee, Jonghwa ; Park, Kyoungseok ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 1~7
DOI : 10.7467/KSAE.2013.21.6.001
This paper focuses on cooling fan control by using a magnetic clutch type for the improvement of fuel economy on a heavy city bus. In general, Heavy duty vehicles use viscous clutch type cooling fan which has some disadvantages, such as slow response, wide temperature variation of engine coolant water. But a magnetic clutch type cooling fan can be controlled electronically so the engine coolant temperature can be precisely controllable and this effects could be used to reduce fuel consumption. A control system for applying the magnetic clutch type cooling fan was developed in this study and applied to the real field test and chassis dynamometer test. The result showed well controlled coolant temperature and enhancement of fuel economy.
A Study on the Signal Transmissibility of High Frequency Crash Pulse according to the Car Structure Difference
Park, Dongkyou ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 8~15
DOI : 10.7467/KSAE.2013.21.6.008
Wide range frequency pulses occur in a car crash test. Until now, low frequency under 400Hz has been used to determine an airbag deployment criteria. Also, FIS (Front Impact Sensor) has been used to detect the crash pulse in early stage. Nowadays, technology to determine an airbag delpoyment criteria by using a high frequency crash pulse without FIS is being focused on. In this paper, the signal transmissibility of high frequency pulse for two different cars was studied. Also, signal transfer test of high frequency pulse was done by using a high speed ball impact. Signal runtime of the frontal impact is compared with that of the side impact. The signal transmissibility difference due to the car structure difference was discussed and structure change for improving the signal transmissibility was proposed.
Development of Proving Ground Test Mode for Durability Test of Active Suspension System
Woo, Jongwoon ; Lee, Seonbong ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 16~23
DOI : 10.7467/KSAE.2013.21.6.016
It is important that proving ground damage is correlated with target customer usage. This paper describes the test mode for durability test of active suspension control system for proving ground correlation and optimization. Acceleration, strain, wheel force and other types of data are collected on a vehicle as it traverses different proving ground surfaces. The primary objective of the analysis is to determine which mixture of proving ground surfaces offers the best representation of customer usage while minimizing the total test time. And durability testing offers the best way to assess the capability of a product to reach its reliability target. The test should be representative of the real environmental load and replicate the same customer usage.
Characteristic Comparison on Internal Cushion Devices at High-speed Pneumatic Cylinders
Kim, Dotae ; Zhang, Zhong Jie ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 24~30
DOI : 10.7467/KSAE.2013.21.6.024
This paper studies the comparative analysis on two different internal cushion devices (the types of needle and relief valve) used to absorb the energy which is generated when the pneumatic cylinder moves with the load at meter-out speed control system. The effect at varying the piston velocity under same driving condition is mainly investigated. The simulation results on pressure in the cushion chamber and the dynamic behavior of the relief valve type cushion device are compared with the needle valve type. Design and performance are improved with the cushion configuration of better quality at high-speed pneumatic cylinder. Based on the relation between absorbed energy and impact energy at cushion process, cushion performance at pneumatic cylinder is evaluated.
Development of FCHEV Virtual Platform using Motor Model Based on Mathematical Formulation
Kim, Sung-Soo ; Park, Sangcheol ; Choi, Jangyoung ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 31~39
DOI : 10.7467/KSAE.2013.21.6.031
A virtual chassis platform for Fuel Cell Hybrid Electric Vehicles(FCHEV) has been developed, and a virtual platform similar to the actual system has been composed. In addition, major components such as a motor, fuel cell and battery for the virtual platform have been constructed by using a mathematical formulation. The FCHEV virtual platform using a detailed model based on the mathematical formula is capable of simulating various conditions according to changes of the control logic and component modules to evaluate performance, considering the vehicle dynamic characteristics. Usability of the mathematical model has been verified by comparative simulations according to the motor current control variation. In addition, reliability of the developed virtual chassis platform has been verified by simulating its fuel consumption with the UDDS(Urban Dynamometer Driving Schedule) FTP-72 velocity profile.
Development of Integrated Control Logic of Wheel Motor Drive Electric Bus considering Stability and Driving Performance
Jeong, Jongryeol ; Choi, Jongdae ; Shin, Changwoo ; Lee, Daeheung ; Lim, Wonsik ; Park, Yeong-Il ; Cha, Suk Won ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 40~48
DOI : 10.7467/KSAE.2013.21.6.040
Recently, many types of electric vehicles including a heavy duty vehicle have been developed and released because of the better fuel economy and less gas products. In this study, research about an electric bus which utilizes the wheel motor drive system was conducted. The wheel motor is a motor connected to the wheel directly only with a simple gear so that the developer can utilize the space efficiently and the whole system efficiency will be better because of simple structure. However, because it is different from former types of vehicles which use the differential gear, the development of the integrated control logic is required in order to meet the vehicle stability and driving performance. The developed control logic is composed with direct yaw moment control, regenerative braking control and slip control logics. It is compared to the control logics which does not consist of direct yaw moment control and slip control when the vehicle is exposed in tough situations. For the unification of the control logic, a few maps were developed and applied to determine the output torque of each motor according to the driving status. As a result, it is shown that the developed control logic is more safe and well follow the target speed than the other control logic applied simulations.
Performance Characteristics of Li-ion Battery and Supercapacitor Hybrid Cell for High Power / Low Temperature Discharge
Jang, Woojin ; Hong, Seung-Chul ; Hong, Jung-Pyo ; Hwang, Taeseon ; Oh, Joon-Suk ; Ko, Sungyeon ; Lee, Gaeun ; Ahn, Kyunyoung ; Kim, Hyunsoo ; Suhr, Jonghwan ; Nam, Jae-Do ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 49~57
DOI : 10.7467/KSAE.2013.21.6.049
In this study, we fabricated a parallelly connected Li-ion battery/supercapacitor hybrid cell to combine the advantageous characteristics of Li-ion battery and supercapacitor, high energy density and high power density, respectively, and investigated its discharging characteristics over a wide temperature range from -40 to
. At the initial state of discharging of the hybrid cell, the power was mostly provided by the supercapacitor and then the portion of the Li-ion battery was gradually increased. By installing a switching system into the hybrid cell, which controls the discharging sequence of Li-ion battery and supercapacitor, the maximum power was improved by 40% compared with non switching system. In addition at low temperatures, the power and discharging time of the hybrid cell were significantly enhanced compared to a battery-alone system. The hybrid cell is expected to be applied in electric vehicles and small domestic appliances that require high power at initial discharging state.
A Study on Traffic Accident Reconstruction through Vehicle Crash Test
Kim, Guanhee ; Lim, Jonghun ; Park, Insong ; Chun, Youngbum ; Cho, Chongdu ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 58~63
DOI : 10.7467/KSAE.2013.21.6.058
It is very difficult to evaluate the impact speed, who caused the accident and what the injury risk of the vehicle occupants was from the outcome of the accident. That`s the main reason why there are so many insurance fraud related to vehicle accident. In this study, a vehicle crash accident suspected to an insurance fraud had been reconstructed to evaluate crash speed and the relationship between the crash accident and passenger injury risk. To do this, the scene was reconstructed based on accident investigation report and three vehicle crash tests were done at 27kph, 37kph and 70kph. The crash speed of 27kph and 37kph were chosen based on the damaged vehicle and 70kph was chosen based on the driver`s statement. Based on the damage of vehicle and dummy injury measure, impact speed is estimated around 20 to 30kph and the dummy measures show that the passengers are not seems to be severely injured in this speed range.
A Performance Modeling of the Lean NOx Trap Catalyst with GT-POWER
Kim, Hyunjun ; Han, Manbae ; Jeon, Ji-Yong ; Kim, Tae-Min ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 64~71
DOI : 10.7467/KSAE.2013.21.6.064
In this study we designed a lean
trap (LNT) model with
program and then the LNT model was compared to the bench flow reactor test results. This model consists of 9 kinetic reactions to represent the main steps of NO oxidation,
release and then its reduction. The comparison was performed on the operating conditions at the space velocity of 50,000 1/hr and 80,000 1/hr with the temperature range of
with the even spaced temperature step of
. The experimental results show that the
conversion efficiency was enhanced by the temperature up to
and then decayed at higher temperatures. The LNT model predicts the similar trend of the
conversion efficiency to the experimental results below
, but overestimates above
. This overestimation comes from the higher reduction efficiency which was obtained by the different reduction gas composition such as
in the model to replace
in the bench test.
A Study on Shape Optimization of Cooling Channel in Hollow Shaft for In-wheel Motor
Lim, Dong Hyun ; Kim, Dong-Hyun ; Kim, Sung Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 72~80
DOI : 10.7467/KSAE.2013.21.6.072
For the proper cooling of in-wheel motor, the cooling channel should have the characteristics which are low pressure drop and adequate cooling oil supply to motor part. In this study, the flow performance of cooling channel for in-wheel motor was evaluated and the shape of the channel was optimized. First, the pressure drop and flow distribution characteristics of the initial channel model were evaluated using numerical analysis. Also, by the result of analysis and design modification, 4 design parameters of the channel were selected. Second, using the Taguchi optimal method, the cooling channel was optimized. In the method, nine models with different levels of the design parameters were generated and the flow characteristics of each models was estimated. Base on the result, the main effect of the design parameters was founded and optimized model was obtained. For the optimized model, the pressure drop and oil flow rate were about 0.196 bar and 0.207 L/min, respectively. The pressure drop decreased by about 0.3 bar and the oil flow rate to the motor part increased by about 0.2 L/min compared to the initial model.
A Design Process for Reduction of Pressure Drop of Air-cooled Condenser for Waste Heat Recovery System
Bae, Sukjung ; Heo, Hyungseok ; Park, Jeongsang ; Lee, Hongyeol ; Kim, Charnjung ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 81~91
DOI : 10.7467/KSAE.2013.21.6.081
A novel design process of a parallel multi-flow type air-cooled condenser of a dual-loop waste heat recovery system with Rankine steam cycles for improving the fuel efficiency of gasoline automobiles has been investigated focusing on reduction of the pressure drop inside the micro-tubes. The low temperature condenser plays a role to dissipate heat from the system by condensing the low temperature loop working fluid sufficiently. However, the refrigerant has low evaporation temperature enough to recover the waste from engine coolant of about
but has small saturation enthalpy so that excessive mass flow rate of the LT working fluid, e.g., over 150 g/s, causes enormously large pressure drop of the working fluid to maintain the heat dissipation performance of more than 20 kW. This paper has dealt with the scheme to design the low temperature condenser that has reduced pressure drop while ensuring the required thermal performance. The number of pass, the arrangement of the tubes of each pass, and the positions of the inlet and outlet ports on the header are most critical parameters affecting the flow uniformity through all the tubes of the condenser. For the purpose of the performance predictions and the parametric study for the LT condenser, we have developed a 1-dimensional user-friendly performance prediction program that calculates feasibly the phase change of the working fluid in the tubes. An example is presented through the proposed design process and compared with an experiment.
Analysis of Fuel Economy Sensitivity for Parallel Hybrid Bus according to Variation of Simulation Input Parameter
Choi, Jongdae ; Jeong, Jongryeol ; Lee, Daeheung ; Shin, Changwoo ; Park, Yeong-Il ; Lim, Wonsik ; Cha, Suk Won ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 92~99
DOI : 10.7467/KSAE.2013.21.6.092
High oil price and global warming problem are being continued all over the world. For this reason, fuel economy and emission of greenhouse gas are regulated by law in many countries. Therefore many companies are researching and producing hybrid electric vehicles (HEVs) which substitute conventional internal combustion engine vehicle. However, these researches and productions are restricted to mainly passenger cars. Because of cost and physical problems, commercial vehicles are difficult to evaluate fuel economy. So simulations are important and it is necessary to know how sensitive parameters that enter into simulation affect. In this paper, forward simulations using AVL Cruise were conducted for analysis of fuel economy for parallel hybrid bus and were repeated by changing each parameter. Based on these results, root mean square errors (RMSE) are calculated for analysis of fuel economy sensitivity. The number of target parameters are 15. These parameters were classified with high and low sensitivity parameter relatively.
Performance Analysis of an Active System for Pedestrian Protection Using Impact Analysis
Park, Jong-Sun ; Jeong, Seong-Boem ; Yun, Yong-Won ; Park, Gyung-Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 100~107
DOI : 10.7467/KSAE.2013.21.6.100
Although automotive safety technologies have been developed steadily, the efforts for pedestrian protection still seems to be insufficient. In a car-pedestrian accident, the structures such as the engine under a hood, the lower part of a windshield and the A-pillar are the major causes of fatal pedestrian injuries. Recently, there have been several studies on the active safety system to reduce the pedestrian injuries. The safety system consists of an active hood lift system and a pedestrian airbag. In this research, the safety performance of the active hood lift system and the pedestrian airbag is investigated by using the finite element method. The finite element model of the system is set up based on the head impact test, and the impact analyses are performed. The necessity and the usefulness of the safety system are verified.
Influences of Injector Nozzle Shape on Nozzle Internal Flow and Outlet Characteristics
Kim, Changhyun ; Lee, Kangsoo ; Park, Jaein ; Baek, Jehyun ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 108~116
DOI : 10.7467/KSAE.2013.21.6.108
Diesel engine injector is used for spraying the fuel into the cylinder chamber. Complex phenomenon like cavitation occurs from small scale domain, highly pressurized condition and rapid injection. Flow inside the nozzle affects the whole engine performance including combustion and exhaust, therefore understanding the flow inside the injector nozzle is very important. In this paper, cylindrical and convergent-divergent nozzles are suggested for nozzle types and their influences on nozzle internal flow and nozzle outlet characteristics will be analyzed by changing their outlet diameters.
The Experimental Research of LNT for 3L-DME Engine
Jang, Jinyoung ; Lee, Youngjae ; Pyo, Youngduk ; Cho, Chongpyo ; Woo, Youngmin ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 117~122
DOI : 10.7467/KSAE.2013.21.6.117
This study is aimed to develop LNT(Lean NOx Trap) aftertreatment system for DME engine. Modified DME engine, which was changed from diesel to current DME engine, is used for this research and is equipped with common rail type injector and fuel supplying system. LNT system has reductant injector. DME is also used as reduction agent. For this research, reduction agent injection time width and interval were varied. And also, swirler was used to improve homogeneity of reducing agent in exhaust pipe. The reduction rate of NOx by LNT was increased by longer injection width, short interval and swirler. The maximum diminution of NOx by LNT was over 85%.
A Study on the Emission Characteristics of Korean Light-duty Vehicles in Real-road Driving Conditions
Park, Junhong ; Lee, Jongtae ; Kim, Sunmoon ; Kim, Jeongsoo ; Ahn, Keunwhan ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 123~134
DOI : 10.7467/KSAE.2013.21.6.123
Strengthening vehicle emission regulation is one of important policies to improve air quality in urban area. Due to the limitation of specified driving cycles for certification test to reflect real driving conditions, additional off-cycle emission regulations have been adopted in US and being developed in Europe. The driving cycles of US or Europe have been used in emission certification for Korean light-duty vehicles, but it has not been known how well the driving cycles reflect various real driving patterns in Korea. In that point of view, it is required to estimate vehicle emission based on real road driving conditions to raise the effectiveness of vehicle emission regulation in Korea. In this study, real driving emission measurements have been conducted for three Korean light-duty vehicles with PEMS. The driving routes consisted of urban, rural and motorway in Seoul and Incheon. The data have been analyzed with various averaging methods including moving averaging windows method and compared to emission limits set with emission certification modes applied to tested vehicles. The results have shown that the real driving pollutant emissions of a gasoline and a LPG vehicles have been ranged quite lower than those of emission limits on CVS-75 driving cycle. But real driving NOx of a light duty diesel vehicle has been considerably higher than emission limit of NEDC driving cycle. The higher than expected NOx emission of a diesel vehicle might be caused by different strategy to control EGR in real driving condition from NEDC driving.
Nonlinear Static Model-based Feedforward Control Algorithm for the EGR and VGT Systems of Passenger Car Diesel Engines
Park, Inseok ; Park, Yeongseop ; Hong, Seungwoo ; Chung, Jaesung ; Sohn, Jeongwon ; Sunwoo, Myoungho ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 135~146
DOI : 10.7467/KSAE.2013.21.6.135
This paper presents a feedforward control algorithm for the EGR and VGT systems of passenger car diesel engines. The air-to-fuel ratio and boost pressure are selected as control indicators and the positions of EGR valve and VGT vane are used as control inputs of the EGR and VGT controller. In order to compensate the non-linearity and coupled dynamics of the EGR and VGT systems, we have proposed a non-linear model-based feedforward control algorithm which is obtained from static model inversion approach. It is observed that the average modeling errors of the feedforward algorithm is about 2% using stationary engine experiment data of 225 operating conditions. Using a feedback controller including proportional-integral, the modeling error is compensated. Furthermore, it is validated that the proposed feedforward algorithm generates physically acceptable trajectories of the actuator and successfully tracks the desired values through engine experiments.
Development and Performance of BMS Modules for Urban Electric Car Using Life Prediction Method
Lee, Jungho ; Park, Chanhee ; Yang, Gyuneui ; Shim, Gangkoo ; Bae, Chulmin ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 147~154
DOI : 10.7467/KSAE.2013.21.6.147
This study reports on the development and investigation of a BMS module using a new algorithm on the driving performance and battery life of electric vehicles. Here, the initial SOC was calculated using an open circuit voltage (OCV) method and a current integral method was later applied to the BMS module. We verified the performance of the BMS module by comparing both the results of the in-vehicle test and the BMS simulator test. Our verification test showed good agreement between the results of experiments and simulation with a small error of
. Here, we confirmed that the present, newly-developed BMS module not only can predict the battery life but can also monitor SOC, pack voltage, and current temperature.
Combustion Characteristics and Exhaust Emissions in Spark-ignition Engine Using Gasoline-ammonia
Ryu, Kyunghyun ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 155~165
DOI : 10.7467/KSAE.2013.21.6.155
The effect of gaseous ammonia direct injection on the engine performance and exhaust emissions in gasoline-ammonia dual fueled spark-ignition engine was investigated in this study. Results show that based on the gasoline contribution engine power increases as the ammonia injection timing and duration is advanced and increased, respectively. However, as the initial amount of gasoline is increased the maximum power output contribution from ammonia is reduced. For gasoline-ammonia, the appropriate injection timing is found to range from 320 BTDC at low loads to 370 BTDC at high loads and the peak pressures are slightly lower than that for gasoline due to the slow flame speed of ammonia, resulting in the reduction of combustion efficiency. The brake specific energy consumption (BSEC) for gasoline-ammonia has little difference compared to the BSEC for gasoline only. Ammonia direct injection causes slight reduction of
and CO for all presented loads but significantly increases HC due to the low combustion efficiency of ammonia. Also, ammonia direct injection results in both increased ammonia and NOx in the exhaust due to formation of fuel NOx and ammonia slip.
Durability Study on Structural Strength due to the Shape of Excavator Wheel
Cho, Jaeung ; Han, Moonsik ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 166~174
DOI : 10.7467/KSAE.2013.21.6.166
This study investigates the strength durability on the results of structural and vibration analysis due to the shape of excavator wheel. As model 2 has the least stress by comparing three models with maximum equivalent stress, model 2 has most durability among three models at static analysis. Maximum equivalent stress is shown at the bottom part contacted with ground and this part on wheel is most affected by load in cases of all models. Safety factor can be decided with the value of 2.3 by considering the yield stress of this model. The range of maximum harmonic response frequencies becomes 6900 to 7000Hz. As model 2 has the least total deformation and equivalent stress at these critical frequencies, model 2 has the most durability at vibration analysis among three models. The structural and vibration analysis results in this study can be effectively utilized with the design of excavator wheel by investigating prevention and durability against its damage.
Estimation of VOCs Affecting a Used Car Air Conditioning Smell via PLSR
You, Hanmin ; Lee, Taehee ; Sung, Kiwoo ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 175~182
DOI : 10.7467/KSAE.2013.21.6.175
Lately, customers think highly of the emotional satisfaction and as a result, issues on odor are matters of concern. The cases are odor of interior material and air-conditioner of vehicles. In particualar, with respect to the odor of air-conditioner, customers strongly claimed defects with provocative comments : "It smells like something rotten," "It smells like a foot odor," "It stinks like a rag." Generally, it is known that mold of evaporator core in the air-conditioning system decays and this produce VOCs which causes the odor to occur. In this study, partial least squares regression model is applied to predict the strength of the odor and select of important VOCs which affect car air conditioning smell. The PLS method is basically a particular multilinear regression algorithm which can handle correlated inputs and limited data. The number of latent variable is determined by the point which is stabilized mean absolute deviations of VOCs data. Also multiple linear regression is carried out to confirm the validity of PLS method.
A Study on Reaction Rate of Solid SCR for NOx Reduction of Exhaust Emissions in Diesel Engine
Lee, Hoyeol ; Yoon, Cheon Seog ; Kim, Hongsuk ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 183~194
DOI : 10.7467/KSAE.2013.21.6.183
Liquid urea based SCR has been used in the market to reduce NOx in the exhaust emission of the diesel engine vehicle. This system has several problems at low temperature, which are freezing below
, solid deposit formation in the exhaust, and difficulties in dosing system at exhaust temperature below
. Also, it is required complicated exhaust packaging equipment and mixer due to supply uniform ammonia concentration. In order to solve these issues, solid urea, ammonium carbonate, and ammonium carbamate are selected as ammonia sources for the application of solid SCR. In this paper, basic research on reaction rate of three ammonia-transporting materials was performed. TGA (Thermogravimetric Analysis) and DTA (Differential Thermal Analysis) tests for these materials are carried out for various heating conditions. From the results, chemical kinetic parameters such as activation energy and frequency factor are obtained from the Arrhenius plot. Additionally, from test results of DSC (Differential Scanning Calorimeter) for these materials, chemical kinetic parameters using the Kissinger method are calculated. Activation energies of solid SCR from this experiment are compared with proper data of literature study, then obtained data of this experiment are used for the design of reactor and dosing system for candidate vehicle.
Evaluation of Vehicle Body Stiffness by Measuring Local Vibration
Lee, Kyung Tae ; Jun, Yong Du ; Choi, Doo Seuk ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 195~200
DOI : 10.7467/KSAE.2013.21.6.195
Road loads data are indispensable in the evaluation of BSR (Buzz, Squeak, and Rattle) of automotive parts/modules. However, there are uncertainties on the best measurement locations for representative body motion and for seat systems. In the present study, we measure road loads at four different locations of a body. A-pillars on the driver and passenger sides and left and right frame fronts of the front passenger seat mountings are selected to study the acceleration behavior at different locations. The measurements are conducted with passenger cars driving local roads at 50km/hr. The measured time-acceleration data are then transformed into PSD (power spectral density) data to compare the characteristics of local accelerations. By defining the deviated acceleration components from rigid body motion, the stiffness of vehicle body could be simply expressed in a quantitative basis. Measured data from two different vehicles are presented to demonstrate their relative vehicle body stiffness.
The Evaluation of Reliability and Forged Process Analysis on Non-weld Forged Steering Shaft
Rha, Wan Yong ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 201~208
DOI : 10.7467/KSAE.2013.21.6.201
Recently, there has been an active study about weight reduction for automotive. This study is prediction and evaluation of one pice type steering component, which is universial joint. Steering system is a core of major safe device in vehicle. Universial shaft adopted in steering system transmit steering torque between olumn and steering gear. Conventional universial shaft is produced by welding process because of geometric complexity. But welding process has some weakness such as deflection on surface, residual stress, and deteronration of material properties so it can deteriorate durability of vehicle.
Control Strategy Development of 4WD Vehicles based on Heuristic Approach and Dynamic Characteristic
Ham, Hyeongjin ; Lee, Hyeongcheol ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 6, 2013, Pages 209~217
DOI : 10.7467/KSAE.2013.21.6.209
This paper presents a control strategy of 4 wheel drive (4WD) vehicles. Proposed control strategy has simple structure and can easily apply to various vehicles with low cost and time. It is consist of feedforward control for traction ability, fedback control for minimizing the wheel speed difference and yaw control for lateral stability. In addition, to integrate the traction and stability control, a blending function is applied. To evaluate the feasibility of the proposed control strategy, actual vehicle experiment is conducted after deciding the tuning parameter through the simulation. The simulation is accomplished by CarSim and Matlab/Simulink and the actual vehicle test is conducted using full size Sports Utility Vehicle (SUV) equipped rear wheel based solenoid type 4WD device.