• Title, Summary, Keyword: Fuel economy

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Fuel Economy Comparison according to Driving Mode Conditions of the Internal Combustion Engine Vehicles (내연기관 자동차의 주행모드 조건에 따른 연비 성능 비교)

  • Choi, Yongjun;Seo, Youngho
    • Journal of Institute of Convergence Technology
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    • v.3 no.1
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    • pp.25-29
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    • 2013
  • The purpose of this paper is to determine the fuel change and weight change impact on the fuel economy and emission characteristic of ICE (Internal Combustion Engine) vehicle. According to fuel type, fuel consumption and emission characteristics were measured and fuel used in this paper was gasoline, diesel, and LPG. Four vehicles with different weight were tested and the fuel economy were compared and analyzed by using scatter graph. Test was carried out using chassis dynamometer, CVS (Constant Volume Sampler), and emission measurement system. Diesel vehicle less emited $CO_2$ compared to gasoline and LPG. Even if same $CO_2$ between gasoline and LPG, there are difference fuel economy depending on carbon proportion of specific fuel. The heavier weight of vehicle, the worse of fuel economy and Better fuel economy performance on highway driving mode.

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Study on Fuel Economy Characteristics by Cumulative Distance of Vehicle (차량 누적거리에 의한 연비 특성 연구)

  • Lim, Jae-Hyuk;Kim, Ki-Ho;Lee, Min-Ho
    • Journal of the Korea Society For Power System Engineering
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    • v.21 no.4
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    • pp.57-61
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    • 2017
  • The vehicle label fuel economy is used as an energy management indicator nationwide. It induces technology development of automobile manufacturers and plays a role of providing information when purchasing a consumer vehicle. However, consumers who purchase a new vehicle continued to complain that the label fuel economy is different from the mandatory fuel economy rate. The domestic fuel economy measurement method is the same as the North American measurement method. The results of the two test modes (urban (FTP-75 mode), highway (HWFET mode)) are calculated in five test modes reflecting various environmental conditions and driving patterns 5-cycle correction formula is used which is equivalent to the fuel efficiency value. In this study, to solve the consumers' curiosity about the fuel economy of new vehicle, we use domestic fuel economy measurement method to measure the new car condition within 150 km of driving distance and the cumulative driving distance condition of domestic label fuel economy test vehicle. A comparative evaluation of fuel economy was carried out for a durability vehicle of $6,500{\pm}1,000km$. A result, mean value of the fuel economy of the four gasoline vehicles increased by 2.7 % in the city center mode and by 2.5 % in the highway mode in the durable vehicle compared new vehicle. And in the case of the diesel vehicle it increased by 2.5 % and 3.9 % respectively. The harmful exhaust gas emitted from the vehicle also resulted in more emissions of both gasoline and diesel vehicles in new vehicles. It is considered that the increase of the frictional force of the vehicle driving system and the lubricating oil system would have an effect on the reduction of the fuel economy of the new vehicle, and it was found that the fuel economy and the exhaust gas were improved by proper cumulative distance (domesticate) to the new vehicle.

Analysis of the Driving Patterns Concerned with Fuel Economy in Seoul Metropolitan Area (서울특별시의 주행특성 분석에 관한 연구)

  • Lee, Y.J.;Kwon, O.S.;Koh, C.J.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.2
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    • pp.1-15
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    • 1995
  • The driving patterns in Seoul metropolitan area were surveyed in an experiment involving 1,212km of driving along seventeen representative routes. The speed and fuel consumption data were recorded and the influence of driving patterns on vehicle fuel economy was analyzed by statistical techniques. The results showed that characteristics of driving in Seoul metropolitan area are far different from that of CVS-75 mode and then on-road fuel economy in Seoul may be small as compared with that of CVS-75 mode. Finally, it was proposed that CVS-75 mode fuel economy should be modified by applying adjustment factor to represent actual on-road fuel economy.

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Automotive Engine Oil and Vehicle Fuel Economy (자동차 엔진오일과 연비)

  • 이영재;김강출;표영덕
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.155-161
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    • 2000
  • To improve the vehicle fuel economy, various technologies such as improvement of power train efficiency, use of light weight material, improvement of aerodynamic design, have been studied. One of the possible way to improve the vehicle fuel economy is to reduce the engine friction loss by improving the engine oil characteristics. In the present paper, it was examined the effect of the engine oil viscosity and the addition of friction modifier to engine oil on vehicle fuel economy improvements. Moreover, the effect of engine oil degradation on vehicle fuel economy was examined with two gasoline vehicles and one diesel vehicle by using the fuel economy test facility.

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Experimental Study on the Effects of Low Viscosity Engine Oils on Fuel Economy (엔진오일의 저점도화가 차량 연비에 미치는 영향에 관한 실험적 연구)

  • Kim, Han-Goo
    • Tribology and Lubricants
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    • v.26 no.5
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    • pp.291-296
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    • 2010
  • The purpose of this paper is to study the fuel economy improvement experimentally when the viscosity of engine oil is lowered. The emissions are measured for CVS-75 mode with SAE viscosity grades. The test results indicate that a close correlation has been found between the engine oil viscosity and the fuel economy. The lowering of engine oil viscosity causes the reduction of friction loss which has a very close relation with the fuel economy. These results as the lowering of engine oil viscosity will be a important factor for improvement of the fuel economy and reduction of the $CO_2$ emission.

Vehicle Fuel Economy Improvement by Studies on the Engine Cooling and Ancilliaries System of the Heavy Duty Engine (차량 연비 향상을 위한 대형 디젤엔진 차량의 엔진 냉각 및 부대장치 연구)

  • Lyu, Myung-Seok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.3
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    • pp.79-84
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    • 2007
  • Recently it is strongly required to develop the better fuel economy as well as basic power performance based on strict emission legislation. This paper focuses on studies of the engine cooling and ancillaries system among fuel economy factors in the developing stage. Firstly through the analysis of the current specifications, it is assessed whether each components may be designed properly, not overdesigned. Secondly, it is predicted how the fuel economy of each components can be improved. Finally the results are confirmed by vehicle field test equppted with the updatedcomponents. This study found good agreementbetween the prediction and the field test on the vehicle fuel economy improvements of the heavy duty engine vehicle with updated components such as engine cooling and ancilliaries.

A Study for Effects of Automatic Transmission Fluid on Fuel Economy (자동변속기유가 연비에 미치는 영향에 대한 연구)

  • Cha SangYeob;Yang SiWon
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.117-122
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    • 2004
  • In order to improve the fuel economy by design change of automatic transmission, various technologies such as increased shift stages, slip control of lock-up clutch and compact and low-weight design have been developed. And also many OEMs have developed their own ATFs as a part of these automatic transmissions. In this study. to investigate the effects of ATF characteristics on fuel economy, we got the worldwide OEM ATFs and made some reference fluids. And physical properties, frictional characteristics and fuel economy using dynamometer test for these fluids were evaluated. From the investigation, it was found that viscosities of ATFs are correlated with fuel economy in dynamometer test and reducing the viscosities made it possible to obtain fuel economy.

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A Study for Effects of Automatic Transmission Fluid on Fuel Economy (자동변속기유가 연비에 미치는 영향에 대한 연구)

  • Cha, Sang-Yeob;Yang, Si-Won
    • Tribology and Lubricants
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    • v.21 no.3
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    • pp.142-148
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    • 2005
  • In order to improve the fuel economy by design change of automatic transmission, various technologies such as increased shift stages, slip control of lock-up clutch and compact and low-weight design have been developed. And also many OEMs have developed their own ATFs as a part of these automatic transmissions. In this study, to investigate the effects of ATF characteristics on fuel economy, we got the worldwide OEM ATFs and made some reference fluids. And physical properties, frictional characteristics and fuel economy using dynamometer test for these fluids were evaluated. From the investigation, it was found that viscosities of ATFs are correlated with fuel economy in dynamometer test and reducing the viscosities made it possible to obtain fuel economy.

Effect of Engine Friction on Vehicle Fuel Economy during Warm-up (웜업시 엔진 마찰이 차량 모드 연비에 미치는 영향)

  • Lim, Gun-Byoung;Wi, Hyo-Seong;Park, Jin-Il;Lee, Jong-Hwa;Park, Kyoung-Seok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.6
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    • pp.109-114
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    • 2008
  • An improvement of vehicle fuel economy is one of the most important topic in automotive engineering. Lots of engineers make efforts to achieve 1% of fuel economy improvement. Engine friction is an important factor influencing vehicle fuel economy. This paper focuses on effect of engine friction on vehicle fuel economy during warm-up. A computer simulation is one of the powerful tools in automotive engineering field. Recently Simulation is attempting to virtual experiment 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 by both of experiment and simulation. The results of fuel economy analysis on experiment substitute for Cruise to calculate fuel economy. The simulation data such as engine speed, brake torque, shift pattern, vehicle speed, fuel consumption level is well correlated to experiment data. In this paper, the change of warm-up time, faster or slower, through simulation is performed. As a result of the fast warm-up, fuel economy is improved up to 1.7%.

EXPLORING THE FUEL ECONOMY POTENTIAL OF ISG HYBRID ELECTRIC VEHICLES THROUGH DYNAMIC PROGRAMMING

  • Ao, G.Q.;Qiang, J.X.;Zhong, H.;Yang, L.;Zhuo, B.
    • International Journal of Automotive Technology
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    • v.8 no.6
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    • pp.781-790
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    • 2007
  • Hybrid electric vehicles(HEV) combined with more than one power sources have great potential to improve fuel economy and reduce pollutant emissions. The Integrated Starter Generator(ISG) HEV researched in this paper is a two energy sources vehicle, with a conventional internal combustion engine(ICE) and an energy storage system(batteries). In order to investigate the potential of diesel engine hybrid electric vehicles in fuel economy improvement and emissions reduction, a Dynamic Programming(DP) based supervisory controller is developed to allocate the power requirement between ICE and batteries with the objective of minimizing a weighted cost function over given drive cycles. A fuel-economy-only case and a fuel & emissions case can be achieved by changing specific weighting factors. The simulation results of the fuel-economy-only case show that there is a 45.1% fuel saving potential for this ISG HEV compared to a conventional transit bus. The test results present a 39.6% improvement in fuel economy which validates the simulation results. Compared to the fuel-economy-only case, the fuel & emissions case further reduces the pollutant emissions at a cost of 3.2% and 4.5% of fuel consumption with respect to the simulation and test result respectively.