• Title, Summary, Keyword: Specific fuel consumption

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A Study on the Fuel Characteristics and Engine Performance of Indolene - Methanol Alternative Fuel (인돌렌-메탄올 대체연료의 연료 특성과 엔진성능에 관한 연구)

  • Lee, Min-Ho;Oh, Yool-Kwon;Cha, Kyung-Ok
    • Journal of ILASS-Korea
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    • v.9 no.4
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    • pp.9-16
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    • 2004
  • A study of the propeny and performance effect of Indolene - Methanol Plus High Alcolhols (MPHA) has been completed. This study invested the measurement of fuel properties and performance parameters. The fuel properties investigated are distillation characteristics, heating valuer flash point, specific gravity and water tolerance. The performance parameters measured are minimum advance for best torque (MBT) spark timing, power output. The alcohol concentration was varied from 0 to 100 percent by volume in clear Indolene. The measurement of fuel properties indicated that, in general, Indolene - MPHA blends have higher water tolerance, similar specific gravity, similar flash point and different distillation characteristics compared to Indolene - Methanol blends. The performance parameters were measured using a single cylinder spark ignition engine at different compression ratios. The results of the performance measurements indicated that Indolene - MPHA blends have a higher MBT spark advance, similar power output.

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Operation Algorithm for a Parallel Hybrid Electric Vehicle with a Relatively Small Electric Motor

  • Kyoungcheol Oh;Kim, Donghyeon;Kim, Talchol;Kim, Chulsoo;Kim, Hyunsoo
    • Journal of Mechanical Science and Technology
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    • v.18 no.1
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    • pp.30-36
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    • 2004
  • In this paper, operation algorithms for a parallel HEV equipped with a relatively small motor are investigated. For the HEV, the power assist and the equivalent fuel algorithms are proposed. In the power assist algorithm, an electric motor is used to assist the engine which provides the primary power source. Tn the equivalent fuel algorithm, the electric energy stored in the battery is considered to be an equivalent fuel, and an equivalent brake specific fuel consumption for the electric energy is proposed. From the equivalent fuel algorithm, distribution of the engine power and the motor power is determined to minimize the fuel consumption for a given battery state of charge (SOC) and a required vehicle power. It is found from the simulation results that the fuel economy and the final battery SOC depend on the motor discharge energy and it is the best way to charge the battery only by the regenerative braking, not by the engine to improve the overall fuel efficiency of the HEV with the relatively small motor.

Study on Fuel Consumption Improvement in SI Engine with EGR for Hybrid Electric Vehicle (하이브리드용 가솔린엔진의 EGR을 통한 연비향상에 관한 연구)

  • Park, Cheol-Woong;Choi, Young;Kim, Chang-Gi
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.2
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    • pp.128-135
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    • 2008
  • EGR(exhaust gas recirculation) is considered as a most effective method to reduce the NOx emissions. But high EGR tolerance is always pursued not only for its advantages of the pumping loss reduction and fuel economy benefit in Gasoline-Hybrid engine. However, the occurrence of excessive cyclic variation with high EGR normally prevents substantial fuel economy improvements from being achieved in practice. Therefore, the optimum EGR rate should be carefully determined in order to achieve low fuel consumption and low exhaust emission. In this study, 2 liters gasoline engine with E-EGR system was used to investigate the effects of EGR on fuel efficiency, combustion stability, engine performance and exhaust emissions. With optimal EGR rates, the fuel consumption was improved by 4%. This improvement was achieved while a reduction in NOx emissions of 75% was accomplished. Increase of EGR gas temperature causes the charge air temperature to affect the knock phenomenon and moreover, the EGR valve lift changes for the same control signal.

Study on the effect of Jet Fuel alteration on Turbine Engine Performances through Turbine Engine Test (터빈엔진시험을 통한 제트연료 변경에 따른 엔진성능 변화 연구)

  • Kim, You-Il;Min, Seong-Ki
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.410-415
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    • 2010
  • The engine ground and altitude tests were carried out to investigate the effect of jet fuel alteration on the performance of a small turbojet engine. JP-S was supplied 8% higher than JP-8 by fuel metering system at the same command. The employment of JP-S showed the similar starting characteristic to that of JP-8, however, difference in the ignition time and acceleration rate of engine speed due to the difference of fuel flow rate by fuel metering system was observed. In spite of jet fuel alteration, the test results yield the similar Steady-State engine performance in Net thrust, Air flow, Exhaust Gas Temperature, etc. On the other hand, the Fuel consumption of JP-S increased by 5 % compared with that of JP-8. In point of Specific Fuel Consumption (SFC), SFC of JP-S was approximately 1.1~2.6 %, 5 % higher than that of JP-8 in ground and altitude tests respectively at the same thrust.

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Study on the effect of Jet Fuel alteration on Turbine Engine Performances through Turbine Engine Test (터빈엔진시험을 통한 제트연료 변경에 따른 엔진성능 변화 연구)

  • Kim, You-Il;Min, Seong-Ki
    • Journal of the Korean Society of Propulsion Engineers
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    • v.15 no.2
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    • pp.23-28
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    • 2011
  • The engine ground and altitude tests were carried out to investigate the effect of jet fuel alteration on the performance of a small turbojet engine. JP-S was supplied 8% higher than JP-8 by fuel metering system at the same command. The employment of JP-S showed the similar starting characteristic to that of JP-8, however, difference in the ignition time and acceleration rate of engine speed due to the difference of fuel flow rate by fuel metering system was observed. In spite of jet fuel alteration, the test results yield the similar steady-state engine performance in net thrust, air flow, exhaust gas temperature, etc. On the other hand, the fuel consumption of JP-S increased by 5 % compared with that of JP-8. In point of specific fuel consumption (SFC), SFC of JP-S was approximately 1.1~2.6 %, 5 % higher than that of JP-8 in ground and altitude tests respectively at the same thrust.

A Study on Efficient Utilization of Power-Tiller Engines (동력경운기(動力耕耘機) 기관(機関)의 효율적(效率的) 이용(利用)에 관한 연구(硏究))

  • Ryu, Kwan Hee;Park, Keum Joo
    • Journal of Biosystems Engineering
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    • v.9 no.2
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    • pp.1-7
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    • 1984
  • The engines mounted on power-tillers are used as power source in various kinds of works such as plowing, harrowing, transporting, spraying, water pumping and threshing, etc. But the engines have not been used effectively from a standpoint of fuel consumption because of lack of proper power transmission system and lack of understanding of fuel consumption characteristics of the engines. Therefore, this study was attempted to establish proper power transmission system between the power-tiller engines and various implements. In order to accomplish the above objective, firstly, power requirement and pulley sizes for various implements, which are driven by the power-tiller engines, were investigated to find out whether the power transmission system is proper. Secondly, partload variable engine-speed test was conducted for 3 different sizes of diesel engines to measure to specific fuel consumption. Thirdly, the present power transmission systems were analyzed in terms of specific fuel consumption, and proper power transmission systems were suggested for various implements. The results of this study are summarized as follows: 1. Power requirement for each fixed-type implement of power-tiller varied from 1.5 ps to 11 ps according to its type and operating conditions, but generally in the range of 2.5 ps to 7 ps. 2. Each power tiller and implement were equipped with only one size of pully with few exeptions. With the present power transmission systems, the engines can't be utilized effectively in terms of fuel economy. The pulley size of engine or implement should be diversified to provide the optimum engine speed for different implements. 3. For a diesel eninge with the rated power output of 6 ps, the optimum engine speed to minimize specific fuel consumption was 2200 rpm for the power reguirement in the range of 6 ps or more, 1700 rpm in the range of 4 to 6 ps, and 1200 rpm in the range of 4 ps or less. 4. For a diesel engine with the rated power output of 8 ps, the optimum engine speed was 2200 rpm for the power requirement in the range of 7 ps or more, 1700 rpm in the range of 4.8 to 7 ps, and 1200 rpm in the range of 4.8 ps or less. 5. For a diesel engine with the rated power output of 10 ps, the optimum engine speed was 2200 rpm for the power requirement in the range of 8.4 ps or more, 1700 rpm in the range of 5.4 ps to 8.4 ps, and 1200 rpm in thr range of 5.4 ps or less. 6. Provided the existing implements are dirven by 8 ps diesel engines, the optimum size of engine pulley should be larger than 120mm for the works of requiring less than 4 ps and 90-110mm for the works requiring 4.5-6.5 ps in order to minimize fuel consumption.

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The Effect of Exhaust Gas Recirculation (EGR) on Combustion Stability, Engine Performance and Exhaust Emissions In a Gasoline Engine

  • Jinyoung Cha;Junhong Kwon;Youngjin Cho;Park, Simsoo
    • Journal of Mechanical Science and Technology
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    • v.15 no.10
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    • pp.1442-1450
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    • 2001
  • The EGR system has been widely used to reduce nitrogen oxides (NO$\_$x/) emission, to improve fuel economy and suppress knock by using the characteristics of charge dilution. However, as the EGR rate at a given engine operating condition increases, the combustion instability increases. The combustion instability increases cyclic variations resulting in the deterioration of engine performance and emissions. Therefore, the optimum EGR rate should be carefully determined in order to obtain the better engine performance and emissions. An experimental study has been performed to investigate the effects of EGR on combustion stability, engine performance,70x and the other exhaust emissions from 1.5 liter gasoline engine. Operating conditions are selected from the test result of the high speed and high acceleration region of SFTP mode which generates more NO$\_$x/ and needs higher engine speed compared to FTP-75 (Federal Test Procedure) mode. Engine power, fuel consumption and exhaust emissions are measured with various EGR rate. Combustion stability is analyzed by examining the variation of indicated mean effective pressure (COV$\_$imep/) and the timings of maximum pressure (P$\_$max/) location using pressure sensor. Engine performance is analyzed by investigating engine power and maximum cylinder pressure and brake specific fuel consumption (BSFC)

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Effect on Characteristics of Exhaust Emissions by Using Emulsified Fuel in Diesel Engine (디젤기관에 있어서 에멀젼연료가 배기배출물 특성에 미치는 영향)

  • Cho, Sang-Gon;Hwang, Sang-Jin;Yoo, Dong-Hoon;Lim, Jae-Keun
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.1
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    • pp.44-50
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    • 2007
  • Diesel engines have high thermal efficiency, and they have less CO & HC emissions than another engines. while NOx & Soot emissions are very much. compared with exhaust emission standards. However, the limit level is more and more strengthened yearly due to the importance of environmental protection. So, the optimal countermeasures for the reduction of NOx & Soot emissions below limit level are required. Therefore. the author has investigated the effects of emulsified fuel on the characteristics of exhaust emissions. using an four-cycle, four-cylinder and direct injection diesel engine because the using of emulsified fuel among various methods for reducing NOx & Soot emissions is simple in installation low in cost and high in efficiency. The results of investigation according to various operating conditions are as follows : 1) Specific fuel consumption increase maximum 19.8% at low load. but is not affected at full load. 2) In case of emulsion ratio 25%, NOx emission decrease 32% at 75% load. 30% at full load. 3) In case of emulsion ratio 25%, Soot emission decrease 84% at 75% load, 59% at full load.

A Study on Emissions and Catalytic Conversion Efficiency Characteristics of an Electronic Control Engine Using Ethanol Blended Gasoline as Fuels

  • Cho Haeng-Muk
    • Journal of Advanced Marine Engineering and Technology
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    • v.29 no.7
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    • pp.722-728
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    • 2005
  • In this paper, the effects of ethanol blended gasoline on emissions and their catalytic conversion efficiency characteristics were investigated in a multiple-point EFI gasoline engine, The results show that with the increase of ethanol concentration in the blended fuels, THC emissions were drastically reduced by up to thirty percent, And brake specific fuel consumption was increased, but brake specific energy consumption could be improved. However, unburned ethanol and acetaldehyde emissions increased. Pt/Rh based three-way catalysts were effective to reduce acetaldehyde emissions, but had low catalytic conversion efficiency for unburned ethanol. The effect of ethanol on CO and NOx emissions and their catalytic conversion efficiency had close relation to the engine's speed, load and air/fuel ratio. Furthermore fuels blended with thirty percent ethanol by volume could dramatically reduced THC CO and NOx emissions at idle speed.

A Study on the Performance of the MPI Gasoline Engine with Gasoline-Ethanol Blends (가솔린-에탄을 혼합연료 사용시의 MPI 가솔린 기관의 성능에 관한 연구)

  • 윤건식;신승한
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.4
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    • pp.92-102
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    • 2001
  • The effect of ethanol-blending on the performances of the MPI gasoline engine was examined. The experiments were carried out for the stoichiometric conditions under MBT spark timing over various operating conditions. The blending rate of ethanol were determined as 10 to 30 percent according to the analysis of the properties of blended fuels. The engine with ethanol-blended fuels showed improved performances such as brake torque, brake power, brake thermal efficiency and exhaust emissions compared with those of pure gasoline over most operating conditions. Though the brake specific fuel consumption was increased by ethanol-blending due to their lower heating values, the increasing rates of the brake specific fuel consumption were limited to the half of the blending rates owing to the increase in the thermal efficiency.

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