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운전 편차에 따른 FTP-75 모드 주행 연비 오차에 관한 연구
위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jonghwa Lee),박경석(Kyoungseok Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A fuel economy of vehicle is one of the important problem in the development of vehicles. In order to improve a vehicle fuel economy, it is a very important to consider a fuel economy on FTP-75 mode driving test as an objective one. Although the test procedure is defined well, it necessarily has an error caused by disturbance. One of the important disturbance is driving pattern. A test driver cannot drive perfectly same as a former test. Thus the error caused by it is always exists. It is interesting study to know the error boundary caused by that difference. This paper focuses on vehicle fuel economy error caused by difference of driving pattern.
위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jong-hwa Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
A cylinder pressure data is used with an important factor to evaluate the efficiency of engine system. There are many article about measuring the cylinder pressure. Spark plug type pressure sensor can be installed to the engine without the configuration about below from engine experiment. But, the precision of the sensor diminishes when it is exposed to the high temperature condition compliance with an intermittent fire it gets of combustion it happens. In order to solve this problem, water cooling type direct mount pressure sensor can be used. However this sensor has some weak points. One is a problem of installing sensors. For using this type of sensors, a cylinder head of a test engine must be processed. It needs much money, time and efforts. Another is a problem of extra equipment such as water pump, chiller and hoses. These make it impossible the experiment of vehicle on a road. Most recently, a pressure sensor company developed a new spark plug pressure sensor designed for thermal shock reduction. In this study, experiment is performed to evaluate thermal shock effect of conventional spark plug sensor based on water cooled direct mount sensor. And also the new spark plug sensor is compared with standard spark plug sensor to evaluate the improved performance. It can be used to rate the reliability of the experiment.
위효성(Hyoseong Wi),조근진(Geunjin Jo),박진일(Jinil Park),박경석(Kyoungseok Park),이종화(Jonghwa Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper focuses on fuel economy improvement according to types of power steering system. Usually, conventional power steering system is directly driven by the crankshaft of engine with belt. But there's some inefficiency in high engine speed range. To improve this inefficiency automobile makers develops new power steering systems, a motor driven hydraulic power steering system and a full electric power steering system. However there's insufficient study about effects of type of power steering system on fuel economy. In this paper, researches are performed on effect of type of power steering system on fuel economy by experiment. And it is also calculated the effect on vehicle fuel economy using computer simulation with AVL cruise software. As a result, 1% of vehicle fuel economy improvement can be achieved in a vehicle with motor driven hydraulic power steering system compared to a vehicle with conventional power steering system. In addition 1.7% of vehicle fuel economy improvement can be achieved using full electric power steering system in LA-4 mode. These results could be used to choose a power steering system on the focus of interest.
총합열관리 시스템 개발 및 활용을 통한 고속버스 연비 개선
위효성(Hyoseong Wi),김우석(Wooseok Kim),박진일(Jinil Park),이종화(Jonghwa Lee),박경석(Kyoungseok Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
A vehicle thermal management system(VTMS) will become increasingly important in the face of the saving of natural resources. It was published many times about VTMS on the focus of single system like electric water pump, magnetic fan clutch, water-cooled charged air cooler(WCAC), 2-stage EGR and so on. In this study, we proposed a total thermal management system including control activities of a coolant circuit, a engine oil, a T/M oil, an axle oil and an low temperature intake cooling system. When it comes to higher temperature of engine oil, we consider the low viscosity oil with special additives like friction modifier. In the case of same engine oil, oil temperature varies the viscosity of the oil. And this tendency is similar in the case of transmission oil and axle oil. Firstly, we have checked the effect of temperature of the oil and friction modifier on friction using a chassis dynamometer. And then, we also try to find correlations between friction at the engine, axle, transmission and fuel economy respectively, using a highway bus. In order to accomplish the higher temperature control methodology, we have to make the coolant temperature higher. In addition, as applying a low temperature coolant circuit, it could be possible to reduce the intake temperature-one of the factor to improve a vehicle fuel economy. And then we suggest the new methodology-model based VTMS control-to improve fuel economy of bus applying additional electro-mechanical equipment on a conventional bus. And also we remodel the bus and test it with the chassis dynamometer. Additionally we perform the experiment on a real road. With these equipments we achieved 4.90% improvement of a fuel economy on 10L diesel bus.
정지구간에서 자동변속기 D단 중립 제어가 LA-4 모드 주행 연비에 미치는 영향
위효성(Hyoseong Wi),정연식(Younsik Jung),박진일(Jinil Park),박경석(Kyoungseok Park),이종화(Jonghwa Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper focuses on vehicle fuel economy improvement using D-Range neutral control of automatic transmission. The system objected to reducing of fuel consumption during idle. Usually, turbine of conventional auto transmission is mechanically linked to wheel during idling condition. Therefore speed ratio of torque converter is zero for that period. This causes needless power loss. To improve this inefficiency automobile makers develops electronically-controlled D-range neutral control system. However there's insufficient study about the effect of D-range neutral control system on vehicle fuel economy. In this paper, researches are performed on effect of D-range neutral control system on vehicle fuel economy by experiment with two different vehicle. And it is also estimated the effect on vehicle fuel economy using computer simulation. As a result, 1.8% of LA-4 mode fuel economy improvement can be achieved in a vehicle by D-range neutral control system.
위규성(Gyuseong Wi),박상준(Sangjoon park),위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The development of DCT(Dual Clutch Transmission) is actively taking place. Because DCT has ease of automatic transmission and high efficiency of manual transmission at the same time. But DCT also has clutch slip like automatic transmission due to driver to feel comfortable at gear changing or vehicle starting. In this study, take a look at clutch slip characteristic in vehicle with DCT. And analysis of break down of vehicle fuel economy is performed for DCT which is compared to automatic transmission. Based on this results, simulation was performed for vehicle with DCT and the results are compared with automatic transmission using by CRUISE which made by AVL company
후륜 구동 A/T 차량의 구동축 강성이 발진 가속에 미치는 영향
안동환(Donghwan Ahn),위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Drivers are requiring higher drivability as the quality of life rises and the performance of the vehicle improves. Especially, drive shaft stiffness is closely related to drivability influential factors of a vehicle such as responsiveness, acceleration, and quietness. In order to make good drivability, powertrain of vehicle must generate driving force that corresponds to acceleration performance requested by the driver. In this paper, vehicle acceleration characteristics - one of the most important factor of drivability - are analyzed according to the drive shaft stiffness. In order to predict vehicle acceleration characteristics, a model to analyze the torque flow of an actual vehicle and a model coefficient measurement methodology are required, contribution of each component in the power distribution process must be understood, and a corresponding simulation model must be established. And based on the simulation result of this research, initial vehicle acceleration characteristics depending on driveshaft stiffness was predicted.