• Title/Summary/Keyword: Automotive fuel

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Experimental Study of Automotive Gasolines in a Light Aircraft Engine (자동차용 가솔린의 경비행기 엔진 적합성에 관한 실험적 연구)

  • Sung, N.M.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.1
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    • pp.108-117
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    • 1995
  • The primary purpose of this extensive test effort was to observe real-time operational performance characteristics associated with automotive grade fuel utilized by piston engine powered light aviation aircraft. In fulfillment of this effort, baseline engine operations were established with 100LL aviation grade fuel followed by four blends of automotive grade fuel. A comprehensive sea-level-static test cell/flight test data collection and evaluation effort were conducted to review operational characteristics of a carbureted light aircraft piston engine as related to fuel volatility, fuel temperature, and fuel system pressure. Presented herein are results, data, and conclusions drawn from test cell engine operation as well as flight test operation on 100LL aviation grade and four blends of automotive grade fuel.

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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.

A Study on Reduction of Fuel Consumption by Displaying Fuel Injection Data for Drivers (연료분사정보 표시장치를 통한 자동차 연비향상 효과에 대한 실험적 연구)

  • Ko, Kwang-Ho
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.4
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    • pp.115-120
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    • 2010
  • The reduction rate of fuel consumption by showing the fuel injection data for driver was measured in this study. The fuel injection data are composed of injection period, real time fuel economy and average fuel economy. The fuel consumption was measured by processing the voltage signal of injector and driven distance by GPS sensor. The fuel consumption was reduced by driving more carefully, i.e driving more steady without sudden acceleration and deceleration watching these fuel injection data. The reduction rate was up to 37% and the rate increased as the driver is customed to this driving pattern.

FUEL CELL ELECTRIC VEHICLES: RECENT ADVANCES AND CHALLENGES - REVIEW

  • Yang, W.C.
    • International Journal of Automotive Technology
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    • v.1 no.1
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    • pp.9-16
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    • 2000
  • The growing concerns on environmental protection have been constantly demanding cleaner and more energy efficient vehicles without compromising any conveniences provided by the conventional vehicles. The recent significant advances in proton-exchange-membrane (PEM) fuel cell technology have shown the possibility of developing such vehicles powered by fuel cells. Several prototype fuel cell electric vehicles (FCEV) have been already developed by several major automotive manufactures, and all of the favorable features have been demonstrated in the public roads. FCEV is essentially a zero emission vehicle and allows to overcome the range limitation of the current battery electric vehicles. Being motivated by the laboratory and field demonstrations of the fuel cell technologies, variety of fuel cell alliances between fuel cell developers, automotive manufactures, petroleum companies and government agencies have been formed to expedite the realization of commercially viable FCEV. However, there still remain major issues that need to be overcome before it can be fully accepted by consumers. This paper describes the current fuel cell vehicle development status and the staggering challenges for the successful introduction of consumer acceptable FCEVS.

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A Study on the Impact of Fuel Economy as Tactive Resistance Calculation Methods on HD Chassis Dynamometer for Medium-heavy Duty Vehicle (주행저항 산출방법이 차대동력계를 이용한 중대형 차량의 연비평가 결과에 미치는 영향에 관한 연구)

  • Lee, Iksung;Seo, Dongchoon;Kim, Soohyung;Ko, Sangchul;Chun, Youngwoon;Cho, Sanghyun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.3
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    • pp.307-314
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    • 2015
  • The purpose of this study is know the fuel economy of difference tractive resistance calculation methods on light duty low-floor bus. Two tractive resistance calculation methods(coastdown test and JFCM conversion formula) are tested to understand the difference of fuel economy. JFCM was developed for fuel economy regulations of heavy duty vehicle. That show a big difference as a result of the calculation using coastdown test and JFCM conversion formula. The difference of the tractive resistance affects the fuel economy.

Effect of Flow Control Valve Type on the Performance of DME High Pressure Fuel Pump (유량 제어 밸브 방식이 DME 고압 연료 펌프의 성능에 미치는 영향)

  • Sin, Yunsub;Lee, Geesoo;Kim, Hyunchul;Jeong, Soo-Jin;Park, Kyungyeong;Suh, Hyun Kyu
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.5
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    • pp.67-73
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    • 2013
  • This experimental work described the effect of flow control valve type on the performance of wobble plate type fuel pump for the stable DME fuel supply. In order to study this, different four types of flow control valves (ITV, SCV, IMV and MPROP) were installed on the wobble plate fuel pump, and fuel flow rate, torque, and temperature variation of pump were investigated under various operating conditions by using pump performance test system. It was revealed that wobble plate type fuel pump worked well with ITV and SCV control valve, and the flow rate and torque of fuel pump was in proportion to the value of valve open duty. The maximum flow rate and torque of fuel pump were achieved around the 50% duty of control valve. Temperature variation at all pump measuring points were under $60^{\circ}C$ which is acceptable.

A Study on the Vibratory Characteristics of the Stack in Fuel Cell Vehicle at Driving Condition (연료전지 차량 주행시 스택의 진동 특성 연구)

  • Ju, Hyung-Jun;Kim, Gi-Hoon;Park, Jae-Yong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.5
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    • pp.50-55
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    • 2010
  • In recent years, the development of fuel cell vehicles has further accelerated because of environmental problem and petroleum resources shortage. The fuel cell vehicles have the stack which converts fuel to electricity. The stack is usually mounted by bush to isolate the vibration of chassis and body. This paper analyzed the vibratory characteristics of stack and chassis, body system. The wheel forces of fuel cell vehicle are measured to estimate the road load data. And the paths of vibration from wheel to stack are analyzed by CAE. According to the test and CAE results, the improvement of stack vibration are evaluated.

Flow analysis of the Hydrogen Recirculation System for Fuel Cells (연료전지 수소 재순환 시스템의 유동해석)

  • Kim, Jae-Choon;Lee, Yong-Taek;Chung, Jin-Taek;Kim, Yong-Chan;Hwang, In-Chul
    • 유체기계공업학회:학술대회논문집
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    • 2005.12a
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    • pp.759-764
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    • 2005
  • In this paper, numerical analysis of hydrogen recycle system has been conducted in order to enhance the efficiency of automotive fuel cell. Generally, the excess hydrogen is provided in the automotive fuel cell. Since the non-reaction hydrogen reduces automotive fuel cell efficiency, reuse of the non-reaction hydrogen can be helpful to improve the fuel cell performance. In case of PEM FC, the water vapor is provided to hydrogen from the cathode so that the mixture experiences phase change depending on the changes of pressure and temperature. The internal flow of the mixture in the hydrogen recirculation system of fuel cell was investigated for real flow conditions. The variation of performance, properties and mass fractions of mixture, hydrogen and water-vapor were investigated. This study was performed based on 80KW level automotive fuel cell's recycling system.

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EXPERIMENTAL ANALYSIS OF DRIVING PATTERNS AND FUEL ECONOMY FOR PASSENGER CARS IN SEOUL

  • Sa, J.-S.;Chung, N.-H.;Sunwoo, M.-H.
    • International Journal of Automotive Technology
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    • v.4 no.2
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    • pp.101-108
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    • 2003
  • There are a lot of factors that influence automotive fuel economy such as average trip time per kilometer, average trip speed, the number of times of vehicle stationary, and so forth. These factors depend on road conditions and traffic environment. In this study, various driving data were measured and recorded during road tests in Seoul. The accumulated road test mileage is around 1,300 kilometers. The objective of the study is to identify the driving patterns of the Seoul metropolitan area and to analyze the fuel economy based on these driving patterns. The driving data which was acquired through road tests was analysed statistically in order to obtain the driving characteristics via modal analysis, speed analysis, and speed-acceleration analysis. Moreover, the driving data was analyzed by multivariate statistical techniques including correlation analysis, principal component analysis, and multiple linear regression analysis in order to obtain the relationships between influencing factors on fuel economy. The analyzed results show that the average speed is around 29.2 km/h, and the average fuel economy is 10.23 km/L. The vehicle speed of the Seoul metropolitan area is slower, and the stop-and-go operation is more frequent than FTP-75 test mode which is used for emission and fuel economy tests. The average trip time per kilometer is one of the most important factors in fuel consumption, and the increase of the average speed is desirable for reducing emissions and fuel consumption.

Numerical Study on the Characteristics of Pressure Pulsations according to Design Factors of Fuel Rail with Self Damping Effect (자체 맥동 감쇠 효과를 갖는 연료레일의 설계 변수별 압력맥동 특성에 관한 수치적 연구)

  • Heo, Hyung-Seok;Bae, Suk-Jung;Song, Kyung-Suk;Kim, Bo-Kyoum
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.1
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    • pp.186-192
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    • 2007
  • In general, pulsation damper is installed in fuel rail for conventional MPI engine to decrease undesirable noise in vehicle cabin room. However, pulsation damper is so expensive that there are prevailing studies to reduce fuel pressure pulsations with integrated damping effect. This paper is one of basic studies for development of fuel rail to abate pulsations with self-damping effect. Primarily, the pressure pulsation characteristics was investigated with aspect ratio of cross section, wall thickness, and materials of fuel rail. A high aspect ratio or thin wall was found to absorb the pressure pulsations effectively. But volume effects on the fuel pressure pulsation reductions were not especially significant than cross section effects because volume increment rate is larger than pressure pulsation reduction rate. The fuel rail made of aluminum is effective for reduction of pressure pulsation than that of low-carbon steel. Pressure change period increases on the basis of same lengths of supply line and fuel rail as the volume is enlarged and/or the thickness of wall is thinned.