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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 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
A Study on the Expansion Cavity Pipe for Performance Improvement of Exhaust System in Automotive
Son, Sung-Man ; Park, Kyoung-Suk ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 1~6
The temperature of exhaust gas was raised by increasing of engine movement on developing engine. Thermal of high temperature and pressure reverse in bellows, because of increasing of engine movement and the thermal performance of converter in combustion. As a result, thermal loss is increased and thermal efficiency is decreased rapidly in bellows, it can occur to damage in mechanical structure. In this study, it was necessary to analyze back pressure performance and thermal characteristic on driving condition in exhaust system. It was adapted braid type bellows and straight type exhaust pipe. It was compared with curve type exhaust pipe for lay-out on considering to design of exhaust system. It was necessary to improve thermal characteristic and back pressure performance so that expansion cavity pipe(ECP) was installed between bellows and catalyst convert. Not only decreasing back pressure was solved but also thermal characteristic problems in exhaust pipe because of increasing capacity. According to this study, the basis of data is presented when new exhaust system is designed.
Kinematic Analysis of a Continuously Variable Valve Actuation Mechanism with Movable Second Cam Center
Kim, Do-Joong ; Kim, Yong-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 7~15
This paper introduces a new variable valve actuation mechanism with movable second cam center. Valve lift and open duration can be continuously varied according to engine speed and load conditions. A new method to analyze the kinematic relations between the first and second cam profiles and valve motion are also introduced. Because of rocker motion of the second cam, conventional motion conversion program could not be used in this problem. An example shows continuous variations of valve motion and adequate ramp incorporation throughout all valve lift modes. Valve acceleration profile at the high lift mode is similar to that of conventional valvetrains. Contact geometry analysis of the mechanism gives basic information on the load conditions between the components.
An Application of DoE Methodology in WAVE Simulation to Identify the Effectiveness of Variables on Engine Performance and to Optimize Responses
Jeong, Dong-Won ; Lim, Ock-Taeck ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 16~25
Testing engine performance using an engine dynamometer requires high technical researchers and many facilities. Nowadays, different variables of CAE program are used for identifying the engine performance instead of engine dynamometer test. This is more convenience, as it does not necessitate an abundance of engine dynamometer experiments and, in addition, produces better results. However, CAE programs also contain various variables which can affect engine performance. Those are coupled with each other, thus making it difficult to determine the effectiveness of different variables on engines. DoE (Design of Experiments) methodology is an efficient way to verify the magnitude of effectiveness on engine performance as well as making responses to be optimized at once without trial & error. This study used data from WAVE simulations, which modeled the DOHC SI engine with in-line 4 cylinders at 1500, 3000 and 4500rpm. DoE methodology is designed properly to determine the effectiveness of five variables on power, BSFC, and volumetric efficiency, as well as to find the optimal response conditions at each rpm through a minimized number of experiments. After finishing DoE process, all the results are examined concerning the reliability of test through a verification experiment.
Robust Model Based Fault Detection of EPB System for Varying Temperature
Moon, Byoung-Joon ; Park, Chong-Kug ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 26~30
In this paper, a robust model based fault detection for varying temperature is proposed, To develop a robust force estimation model, it needs temperature information because the force sensor's output is affected by a temperature variation. If an EPB system does not include a temperature sensor, the model has a much larger error than an EPB system with a built-in temperature sensor. Therefore, the temperature is estimated by using Ohm's law. The force model is applied with a motor current, battery voltage, operation mode, and the estimated temperature to detect a force sensor's abnormal signal fault. The residual is calculated by comparing the value of the measured force and the estimated force. Fault information is collected by using the output of the evaluated residual with the adaptive thresholds. A proposed robust model based fault detection for varying temperature was verified by HILS (Hardware in the Loop Simulation).
Expansion of Operating Range and Reduction of Engine out Emission in Low Temperature Diesel Combustion with Boosting
Shim, Eui-Joon ; Han, Sang-Wook ; Jang, Jin-Young ; Park, Jung-Seo ; Bae, Choong-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 31~38
Supercharging system was adopted to investigate the influence of boost pressure on operating range and exhaust emissions by using a supercharger at low temperature diesel combustion (LTC) condition in a 5-cylinder 2.7 L direct injection diesel engine. The experimental parameters such as injection quantity, injection timing, injection pressure and exhaust gas recirculation (EGR) rate were varied to find maximum operating range in LTC condition. As a result of adopting increased boost pressure in LTC, wider operating range was achieved compared with naturally aspirated condition due to increased mixing intensity. Increased boost pressure resulted in lower hydrocarbon (HC) and carbon monoxide (CO) emissions due to increased swirl rate and mixing intensity, which induced complete combustion. Moreover, increased boost pressure in LTC resulted in much lower soot emissions compared with high speed direct injection (HSDI) condition.
An Experimental Study on the Combustion and Emission Characteristics of Blends of GTL / Biodiesel in Diesel Engine
Moon, Gun-Feel ; Lee, Yong-Gyu ; Choi, Kyo-Nam ; Jeong, Dong-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 39~45
An experimental research with 2.0 liter 4-cylinder turbocharged diesel engine was carried out to investigate the combustion and emission characteristics for various alternative fuels. The conventional diesel fuel, neat GTL, blends of 80% of GTL and 20% of biodiesel derived from waste cooking oil are utilized without any modification of engine hardware and ECU data. For GTL and blends of GTL/biodiesel fuel, the ignition delay decreased at the same operating conditions, and overall combustion duration increased slightly. Also, the peak cylinder pressure increased for blends of GTL/biodiesel compared to diesel and GTL fuel. THC and CO emissions with blends of GTL/biodiesel compared to other fuels decreased for the low and middle load conditions. But NOx emission increased due to oxygen content in biodiesel. The number concentrations of PM are higher for blends of GTL/biodiesel than other test fuels in the nucleation mode, while it had an opposite tendency in the accumulation mode, which implies more reduction of PM for blends of GTL/biodiesel on the base of mass concentration.
A Study on NOx Formation Pathway of Methane-Air Lean Premixed Combustion by using PSR Model
Lee, Bo-Rahm ; Kim, Hyun ; Park, Jung-Kyu ; Lee, Min-Chul ; Park, Won-Shik ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 46~52
In this study the predictions of NOx in methane-air lean premixed combustion in PSR were carried out with GRI 3.0 methane-air combustion mechanism and Zeldovich, nitrous oxide, prompt, and NNH NO formation mechanism by using CHEMKIN code. The results are compared to the JSR experimental data of Rutar for the validation of the model. This study concerns about the importance of the chemical pathways. The chemical pathway most likely to form the NO in methane-air lean-premixed combustion was investigated. The results obtained with the 4 different NO mechanisms for residence time(0.5-1.6ms) and pressure(3, 4.7, 6.5 atm) are compared and discussed.
Performance and Emission Characteristics of a DI Diesel Engine Operated with LPG/DME Blended Fuel
Lee, Seok-Hwan ; Oh, Seung-Mook ; Choi, Young ; Cho, Jun-Ho ; Cha, Kyoung-Ok ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 53~60
In this study, LPG-blended DME fuel was experimentally investigated in CI(compression ignition) engine. In particular, performance, emissions characteristics (including hydrocarbon, CO, and NOx emissions), and combustion stability of engine fueled with LPG-blended DME fuel were examined. The extent of LPG fuel in the blended fuel was 0-40 wt%. Results showed that stable engine operation was possible in a wide range of engine loads on DME blended with maximum 30% of LPG by mass in a CI engine. Considering the results of the engine power output and exhaust emissions, blended fuel up to 30% of LPG by mass can be used as an alternative to diesel in a CI engine. LPG blended DME fuel is expected to have potential for enlarging the DME market.
Combustion and Nano-particulate Emissions Characteristics of a Compression Ignition Engine Fueled with Oxygenated Blending Fuel
Cha, June-Pyo ; Yoon, Seung-Hyun ; Chon, Moo-Soo ; Lee, Chang-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 61~66
An experimental investigation was conducted to analyze the effects of biodiesel-ethanol and biodiesel-diesel blended fuels on the characteristics of combustion and exhaust emissions, and size distributions of particulate matter in a single cylinder diesel engine. The three types of test fuel were biodiesel and two blended fuels which were added ethanol and diesel by 20 % volume based fraction into biodiesel, respectively. In this study, the injection rate, combustion pressure, exhaust emissions and size distributions of particulate matter were measured under various injection timings and injection pressures. The experimental results show that biodiesel-ethanol blended fuel has lengthened ignition delay and low combustion pressure in comparison with those of biodiesel and biodiesel-diesel blended fuel even if all fuels indicated similar trends of injection rate under equal injection pressures. In addition, the ethanol blended fuel significantly reduced nitrogen oxidies (NOx) and soot emissions. And then the size distribution of particulate matters shows that blended fuels restrain the formation of particles which were beyond the range of 150nm comparison with biodiesel fuel.
An Experimental Study of Dilution Methods for Preventing Volatile Particle Generation during Measurement of Diesel Particle Number Concentration
Yim, Tae-Ho ; Kim, Hong-Suk ; Cho, Hyoung-Mun ; Lee, Jin-Wook ; Jeong, Young-Il ; Jeon, Heung-Shin ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 67~73
Recently, Europe decided to start the regulation of diesel engine nanoparticles because of its well known adverse health effects. The diesel nanoparticles can be classified as solid carbon particles and volatile particles. The volatile particles generates during dilution process by condensation of gas phase volatile compounds such as hydrocarbon. The new nanoparticle regulation considers only solid particles because of difficulty of measurement of volatile particles. The aim of this study is to suggest a proper dilution method that prevent the volatile particle generation. As a result, it is found that the
dilution air temperature should be above
in order to prevent volatile particle generation effectively. It is also found that the volatile particles can be removed effectively in the evaporation tube by the increase of evaporation tube temperature. But when exhaust gas is hot enough (>
, in this study) and it is diluted in the first diluter with high temperature air (>
), removal phenomenon of volatile particles by increasing of evaporation tube temperature can not be seen. It means that there are no volatile particles in the diluted exhaust gas. Additionally, dilution ratio is not an important factor for volatile particle generation compared with dilution air temperature or evaporation tube temperature.
A Study on the Magnetic Field Analysis and Optimal Core Design of DC Current Sensor for Vehicles
Lee, Hee-Sung ; Park, Jong-Min ; Kim, Choon-Sik ; Kim, Sung-Gaun ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 74~83
Recently, usage of electric and electronic system for car increases rapidly. Consequently power monitoring supplied to the system is essential for management and controlling. Generally, battery status is monitored through measuring and diagnosing the current measurement method utilizing Hall Effect. Therefore, in this paper, we analysed magnetic field to develop the solution of DC current sensor using Hall Effect which is the core of design and development. By analysing the magnetic field by FEM using Maxwell 3D software, the location of the highest output current and stable part in the Hall IC sensor was shown. Also, the optimal core design of DC current sensor using parametric and Simplex method was presented. A car battery charge and discharge process dependant on time effect on the changing of magnetic field was simulated and compared to the result from the experiment result of actual vehicle.
A Study on Developing Reverse Parking Assistant Algorithm for Hi-modal Tram
Choi, Seong-Hoon ; Park, Tae-Won ; Lee, Soo-Ho ; Moon, Kyeong-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 84~90
The bi-modal tram is under development as a new public transportation. The features of the tram are an extended wheel base and its length. This features result in difficulties for drivers on maneuvering the tram. Therefore, the all wheel steering system is applied to the articulated vehicle. The AWS system enables the vehicle to steer all the rear wheels independently and improves its driving characteristics. However, the bi-modal tram has a problem to move backward in the limited place because of its geometric feature and the AWS system. Hence, the reverse parking assistant algorithm for articulated vehicle is developed to solve the problems of the reverse parking. Using the vehicle model which includes the reverse parking assistant algorithm, the dynamic analysis is performed for several parking cases. By the result of the analysis, the stability and validity of the reverse parking assistant algorithm is verified.
An Experimental Study on Active Regeneration Timing for the Minimization of Fuel Penalty in Active Regeneration DPF System Using Diesel Injection
Rah, Seung-Woo ; Choung, Youn-Kyoo ; Oh, Kwang-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 91~96
The number of vehicles applied diesel engine are rapidly rising for fuel economy. Accompanying this trend, application of an after-treatment system is strictly required as a result of reinforced emission regulation. The Diesel Particulate Filter (DPF) system is considered as the most efficient method to reduce particulate matter by car makers but also in retrofit market. In this paper we discussed the optimization of active regeneration timing by comparing the fuel consumption from back pressure caused by PM loading and from active regeneration. The effects of back pressure of DPFs during PM loading, active regeneration condition and engine emission(PM) on additional fuel consumption are experimentally investigated and the proper regeneration timings according to DPF systems and fuel loss for 160,000km are determined.
Emission Factor and Fuel Economy Calculation Using Vehicle Inspection and Maintenance Program
Lee, Tae-Woo ; Keel, Ji-Hoon ; Park, Jun-Hong ; Eom, Myoung-Do ; Kim, Jong-Choon ; Lee, Dae-Yup ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 97~106
An objective of this study is to give practical information that could be used for calculating pollutant emission factors and fuel economy from Korean Inspection & Maintenance program, which has been using steady state acceleration simulation mode. Concentration results from I/M test is adequately converted to mass emission factors and fuel efficiency data, which have unit of g/km and km/L, respectively. Exhaust volume flow(EVF), which is for converting emission result from concentration to mass, is measured by tracer method in various vehicle speed - power condition. It is found that there is an apparent second order relationship between EVF and vehicle inertia weight. EVF is expressed in function of vehicle inertia weight in order to estimate EVF in I/M site without measuring device. Converted mass emission results from measured EVF and raw emission analyzer show a satisfactory agreement with those from conventional CVS-bag type measurement system. Mass emission factors and fuel efficiency from measured EVF and estimated EVF also show good agreement to each other. Considering that an I/M program has great advantages to recruit-based emission test in terms of the number of test vehicle, the information in this study can be used for developing an alternative procedure to collect more various data to establish national database of mobile emission factors and fuel economy, even though the driving cycle in I/M program is steady state cycle rather than transient cycle.
Sensitivity Analysis on Design Parameters of the Fuel Injector for CRDI Engines
Jang, Joo-Sup ; Yoon, Young-Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 107~114
A Common-Rail Direct Injection (CRDI) system for high speed diesel engines was developed to meet reductions of noise and vibration, emission regulations. High pressure in the common rail with electric control allows the fuel quantity and injection timing to be optimized and controlled throughout a wide range of engine velocity and load conditions. In this study, CRDI system analysis model which includes fuel and mechanical systems was developed using commercial software, AMESim in order to predict characteristics for various fuel injection components. The parameter sensitivity analysis such as throttle size, injection rate, plunger displacement, supply pressure of fuel injection for system design are carried out.
Crashworthiness Analysis of the Urban Maglev Vehicle according to Korean Railway Safety Law and Urban Transit Safety Law
Lee, Hyun-Cheol ; Koo, Jeong-Seo ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 115~126
This paper studied on the application of the crashworthiness regulations of Korean Railway Safety Law and Urban Transit Safety Law to the urban Maglev vehicle of KIMM. The Urban Maglev vehicle has to comply with the crashworthiness regulations for urban transit vehicles. The collision load cases have been simulated by using explicit finite element analysis. From the numerical results, the crashworthiness regulations of the Urban Transit Safety Law were completely satisfied, but maximum crash pulse requirement in 25 km/h crash event and no plastic deformation requirement in 10 km/h crash event in the Korean Railway Safety Law were not. If a commercial urban Maglev vehicle is developed in the near future, it is necessary that some soft buffing and energy absorbing devices are adopted in its front end so as to satisfy the crashworthiness regulations of the Korean Railway Safety Law.
Prediction of the Transient Performance of the Passenger Diesel Engine with Turbocharger using HIL
Chung, Jin-Eun ; Jin, Young-Wook ; Jeong, Dong-Young ; Chung, Jae-Woo ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 127~132
The transient performance of the passenger diesel engine equipped with the variable geometry turbocharger was simulated using HIL(hardware-in-the-loop) system. The system consists of engine model as software, and the turbocharger test bench as hardware. The engine model is mean value model which is programmed by the Simulink of the Mathworks. The turbocharger test bench is composed of a blower, some sensors, and DAQ boards. A real time simulation is possible since the operating system based on the real time is included. The results show the good response for the transient characteristics. Therefore this HIL system can be used for development of the new turbocharger effectively.
Research on Aggressivity of Light Truck Vehicle and SUV to Passenger Vehicle
Kim, Guan-Hee ; Park, In-Song ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 5, 2009, Pages 133~139
When two cars impact each other, it is usually known smaller vehicle's passenger likely to be more seriously injured than bigger one's. Generally it is known that SUVs and Light Truck Vehicles (LTVs) are bigger and heavier than passenger vehicles and their drive height such as bumper rail and side member, and front end stiffness are higher than those of passenger vehicles. Because of these characteristics the occupants of passenger vehicle struck by SUVs or LTVs are more likely to experience severe injury or fatal injury. To evaluate SUV and LTV's aggressivity to passenger vehicle, SUV to passenger vehicle and LTV to passenger vehicle head-on crash test have been carried out. And finally the way how to reduce incompatibility between SUV and LTV and passenger vehicles is suggested.