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중대형 승합차의 차대동력계 시험과 시뮬레이션 방법의 연비 비교 분석 연구
정장호(Jang Ho JUNG),박현창(Hyun Chang PARK),김다은(Da Eun KIM),노경완(Kyung Wan RHO) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
The fuel economy of vehicles is very important for vehicle owners and affected by various kinds of factors. The fuel economy of the medium and heavy-duty vehicles(MHDV) is strongly influenced by weight factors such as payload or the number of passengers. However, there is not clearly determined method and procedure to measure fuel economy of MHDV on the chassis dynamometer with the exhaust gas analyzer in Korea. The United States and European countries have been using simulation programs to calculate the fuel economy of heavy-duty vehicles. Korea has been following the similar step to measure fuel economy of MHDV as well. However, there are pros and cons. The simulation program does not need the large amount of investment for test facilities, but the calculated results from the simulation could not include all the vehicle factors related with fuel economy. The purpose of this study is to compare the results acquired by the simulation program and the chassis dynamometer test. The study results show that the fuel economy from the simulation was up to 36.8% higher than that from the chassis dynamometer test. Because it is difficult to apply all the fuel economy influence factors of heavy-duty vehicles at the simulation program. Therefore it is more appropriat e to directly measure the fuel economy on the chassis dynamometer with the exhaust gas analyzer than to calculate it from simulation program to label fuel economy information on MHDV.
중대형 상용차의 차대동력계와 시뮬레이션 방법에 따른 연비 비교 분석 연구
정장호(Jang Ho JUNG),김다은(Da Eun KIM),노경완(Kyung Wan RHO) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
The fuel economy of vehicles is very important for vehicle owners and affected by various kinds of factors. The fuel economy of heavy-duty vehicles are strongly influenced by weight factors such as payload or the number of passengers. However, there is not clearly determined method and procedure to measure fuel economy of heavy-duty vehicles on the chassis dynamometer in Korea. The United States and European countries have been using simulation programs to calculate heavy-duty vehicles’ fuel economy. Korea has been following the similar step to measure fuel economy of heavy-duty vehicles as well. However, there are pros and cons. The simulation program does not need the large amount of investment for test facilities, but the calculated results form the simulation could not include all the vehicle factors related with fuel economy. The purpose of this study is to compare the results acquired by between the simulation program and the chassis dynamometer. The study results show that the fuel economy of the simulation was up to 29.0% higher than that of the chassis dynamometer. It is not realistic. As a result, the chassis dynamometer method with the exhaust gas analyzer is even better to get fuel economy for heavy-duty vehicles than the simulation program.
과도운전 구간에서의 연비인자 거동 및 이를 고려한 모드연비 시뮬레이션
이동규(Dongkyu Lee),김대광(Daekwang Kim),이병옥(Byoungohk Rhee),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The fuel energy injected into a vehicle is dissipated at subsystems of the vehicle including engine, transmission, drive-train, etc. In this study, a new methodology analyzing contributiveness of vehicle subsystem on fuel economy is proposed. Finding optimal combination of subsystems is as much important as improving efficiency of each subsystem for vehicle fuel economy. In order to achieve it, the simulation of vehicle fuel economy is performed using commercial software. Most of the subsystems are modeled for this simulation and vehicle tests are carried out to get model coefficient. The result of simulation on fuel economy is compared to that of vehicle test. Especially, the result of a simulation considered transient states shows under 1% of error comparing with a test on a chassis-dynamometer.
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.
가솔린 차량의 과도구간에서 점화시기 제어를 고려한 주행모드 시뮬레이션
정연식(Yeonsik Jung),오정택(Jungtaek Oh),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Modern vehicles require a high degree of refinement, including good drive ability to meet customer demands. Vehicle drive ability, which becomes a key decisive factor for marketability, is affected by many parameters such as engine control and the dynamic characteristics in drive lines. This paper focuses on the simulation of FTP-75 mode which is considered with spark timing control on transient condition. Break down of vehicle fuel consumption for FTP-75 mode show that the first is acceleration, foremost is steady, next is the braking, next is the idle. The result of the experiment is that the acceleration is the most important factor for vehicle fuel economy. The retard of spark timing increase in proportion to acceleration. Likewise, BSFC(Break Specific Fuel consumption) which is affected by spark timing also increase in proportion to acceleration. The result of simulation considered transient condition shows 0.48% of error comparing with a test on chassis-dynamometer.
정연식(Yeonsik Jung),위효성(Hyoseong We),박진일(Jinill Park),이종화(Jonghwa Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, simulation is attempted to reenact vehicle driving mode test not using expensive instruments. It is possible to presuppose fuel economy by changing the performance of accessories using Cruise(vehicle simulation software). But Cruise generates an error in case of FTP mode simulation compare with vehicle driving mode test. Because the result of steady state performance does not indicate transient state driving condition. This paper focuses on the simulation of FTP-75 mode which is considered with fuel injection timing control and boost pressure on transient condition of diesel vehicle. The result of simulation considered transient condition shows 2.9% of error comparing with a test on chassis-dynamometer.
엔진 웜업시 오일온도에 따른 엔진 마찰이 차량 모드 연비에 미치는 영향
김병수(Byeongsu Kim),임건병(Gunbyoung Lim),이병옥(Byoungohk Rhee),박진일(Jinill Park),이종화(Jonghwa Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently Simulation resulted in developing computer is attempting to experiment vehicle driving not using expensive instruments. It is possible to presuppose fuel economy by changing the characteristic of accessories using CRUISE(vehicle simulation software). In this paper, fuel consumption at each part of the vehicle is analyzed from experiment. The results of fuel economy analysis on experiment substitute for Cruise to measure fuel economy. The achieved simulation data such as engine speed, brake torque, shift pattern, vehicle speed, fuel consumption level is almost equal to experiment data. In this paper, it is performed that warm-up time of engine oil temperature is faster or slower through simulation. The faster engine oil warm-up time is, the more engine friction is decreased. As a result of decreasing of engine friction, fuel economy is improved maximum up to 1.7%.
무단변속기에 의한 FTP-75 모드 연비 기여도 및 개선효과 분석
김현우(Hyeonwoo Kim),안동환(Donghwan Ahn),고현상(Hyeonsang Ko),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
A study of AT(auto-transmission) is continuing to improve the fuel economy and powertrain performance with multistage technology in a lot of car companies. But an AT has a problem with stage limit. So a research of CVT(continuously variable transmission) which can drive on the ideal driving condition is going on until nowadays. Further more among these researches, an fuel economy improvement effect analysis is needed when an AT is replaced a CVT, Although a lot of time and money is required in this study simulation can reduce them. In this paper, we analyzed the fuel economy improvement effect when CVT installed on a gasoline vehicle instead of an AT. For this study, we took a FTP-75 mode on chassis dynamometer and analyzed the energy flow down in the CVT vehicle. And we composed modeling and did the simulation by AVL CRUISE based on the results of CVT vehicle analysis data. As a results, it could be accomplished 7.5% improvement of fuel economy when CVT replaced an AT.
미국과 일본의 중대형차 연비규제에 따른 국내 중대형차량의 연비 시뮬레이션
염시호(siho Yum),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
National CO2 emission regulations by Kyoto protocol will be prescribed in the world. In case light vehicles, fuel efficiency is regulated by qualified driving test cycle like CVS75, EURO and etc. These are tested by using chassis dynamometer and exhaust gas analyser. However, Fuel economy regulations of Heavy duty vehicle is not enforced until now. For this reason, Japan prepared the world"s first fuel economy regulations for heavy vehicle by simulation which based on engine experiment. Also, US prepared fuel economy regulations similar to Japan. In this paper, fuel economy regulations of Japan and US are analyzed. And simulate the domestic produced heavy-duty vehicle"s fuel economy by using AVL CRUISE. And check the result which can be satisfied on Japan and US regulations.
김기복(Kibok Kim),박진일(Jinil Park),이종화(Jonghwa Lee),박경석(Kyoungseok Park),김우석(Wooseok Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
A shift pattern is a very important factor on a vehicle fuel economy. Especially for manual transmission vehicles, a fuel economy varies according to a driver's tendency. If an indicator put a driver on notice of gear shift on pertinent point of time, the fuel economy can be improved. This paper focuses on fuel economy improvement through change of gear shifting engine speed and presents a gear shift algorithm considering a traction force, an APS, a vehicle acceleration and a BSFC(Brake Specific Fuel Consumption). The bigger portion of high gear stage is, the better the engine efficiency and lower total cycle there will be. So the fuel economy of the vehicle becomes better. The specification of test vehicle is 6000㏄ diesel engines and the test condition is two cases, shift on high engine speed and shift on low engine speed. In the case of real experiment on the road, when the shift the gears at the normal condition, it was showed a preponderance of 25% at the shift on low engine speed in the average of twice experiments but the result of only 9% at the shift on high engine speed. That is, the lower engine speed is, the better fuel economy is presented. There are similar result at the simulation. However, if the engine speed is low in a gear shift, the vehicle can not be sufficient traction force. So, vehicle speed will be low or the section that can not follow required vehicle speed is occurred. In order to improve these problems, presented a gear shift algorithms that is considering a traction force. Our team got a shift profile to algorithm and applied it to the simulation. As a result, 13.7% of vehicle fuel economy improvement can be achieved comparing to normal condition.