• Title, Summary, Keyword: Fuel efficiency

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OPERATION ALGORITHMS FOR A FUEL CELL HYBRID ELECTRIC VEHICLE

  • PARK C.;KOOK K.;OH K.;KIM D.;KIM H.
    • International Journal of Automotive Technology
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    • v.6 no.4
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    • pp.429-436
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    • 2005
  • In this paper, operation algorithms are evaluated for a fuel cell hybrid electric vehicle (FCHEV). Power assist, load leveling and equivalent fuel algorithm are proposed and implemented in the FCHEV performance simulator. It is found from the simulation results that the load leveling algorithm shows poor fuel economy due to the system charge and discharge efficiency. In the power assist and equivalent fuel algorithm, the fuel cell stack is operated in a relatively better efficiency region owing to the battery power assist, which provides the improved fuel economy.

DTG Big Data Analysis for Fuel Consumption Estimation

  • Cho, Wonhee;Choi, Eunmi
    • Journal of Information Processing Systems
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    • v.13 no.2
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    • pp.285-304
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    • 2017
  • Big data information and pattern analysis have applications in many industrial sectors. To reduce energy consumption effectively, the eco-driving method that reduces the fuel consumption of vehicles has recently come under scrutiny. Using big data on commercial vehicles obtained from digital tachographs (DTGs), it is possible not only to aid traffic safety but also improve eco-driving. In this study, we estimate fuel consumption efficiency by processing and analyzing DTG big data for commercial vehicles using parallel processing with the MapReduce mechanism. Compared to the conventional measurement of fuel consumption using the On-Board Diagnostics II (OBD-II) device, in this paper, we use actual DTG data and OBD-II fuel consumption data to identify meaningful relationships to calculate fuel efficiency rates. Based on the driving pattern extracted from DTG data, estimating fuel consumption is possible by analyzing driving patterns obtained only from DTG big data.

A Study on Vehicle Application and Performance of LNG-Diesel Dual Fuel Engine (LNG-디젤 혼소엔진의 성능 및 실차 적용성 연구)

  • Lee, Seok-Hwan;Kim, Hong-Suk;Cho, Gyu-Baek;Hong, Sun-Cheol;Lee, Jin-Wook
    • Journal of ILASS-Korea
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    • v.16 no.2
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    • pp.97-103
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    • 2011
  • The electronically controlled diesel engine was converted to dual fuel engine system. Test engine was set up for investigating the power output, thermal efficiency and emissions. ND 13-mode tests were employed for the engine test cycle. The emission result of dual fuel mode meets Euro-4 (K2006) regulation and the engine performance of dual fuel engine was comparable to the performance of diesel engine. To estimate economical efficiency, test vehicles have been operated on a certain driving route repeatedly. Fuel economy, maximum driving distance per refueling and driveability were examined on the road including free ways. Developed vehicle can be operated over 500 km with dual fuel mode and shows 80% of diesel substitution ratio. Driveability of dual fuel mode is similar with that of diesel mode.

Development of High Performance Intelligent Oxy-fuel Combustion Reheating Furnace (고성능 순산소 연소시스템의 가열특성에 대한 연구)

  • Lee, Sang-Jun;Noh, Dong-Soon;Kim, Hyouck-Ju;Lee, Eun-Kyung;Choi, Kyu-Sung;Ko, Chang-Buk;Lee, Sung-Soo
    • 한국연소학회:학술대회논문집
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    • pp.175-180
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    • 2004
  • Improving furnace efficiency is a high priority need for aluminum, glass, steel and other metal casting industries. Oxy-fuel combustion is considered to be one of the most effective method to improve thermal efficiency and reduce $NO_x$, SOx and $CO_2$ emissions for high temperature furnaces. The characteristics of an oxy-fuel flame, in particular its shape, radiation profile and exhaust gas composition are considerably different to those of an air-fuel burner. For this reason, a new approach is needed regarding factors such as burner design, power input levels, number and positioning strategies of burners and also control philosophies. In this paper will discuss the latest developments of high performance oxy-fuel combustion reheating furnace system. This high performance oxy-fuel combustion system will be shown to be technologically superior to other types of combustion systems in the areas of fuel efficiency, emissions and productivity.

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Optimal Operation Scheme and Reliability Index Improvement of Micro Grid Using Energy Storage Systems (에너지 저장장치를 이용한 마이크로 그리드의 최적운영 및 신뢰도 지수 개선)

  • Kim, Kyu-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.2
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    • pp.205-210
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    • 2014
  • The micro grid considered in this paper consists of a diesel generator, a photovoltaic array, a wind turbine, a fuel cell, and a energy storage system. This paper explains and simulates the micro grid components in terms of accuracy and efficiency of having a system model based on the costs of fuel as well as operation and maintenance. For operational efficiency, the objective function in a diesel generator consists of the fuel cost function similar to the cost functions used for the conventional fossil-fuel generating plants. The wind turbine generator is modeled by the characteristics of variable output. The optimization is aimed at minimizing the cost function of the system while constraining it to meet the customer demand and safety of micro grid. The operating cost in fuel-cell system includes the fuel costs and the efficiency for fuel to generate electric power. To develop the overall system model gives a possibility to minimize of the total cost of micro grid. The application of optimal operation can save the interruption costs as well as the operating costs, and improve reliability index in micro grid.

Optimization of Condensate Water Drain Logic Depending on the Characteristics of Drain Valve in FPS of Fuel Cell Vehicle and Development of Anode Water Management Strategy to Achieve High Fuel Efficiency and Operational Stability (연료전지 자동차 내 수소 공급 시스템에서 드레인 밸브 특성에 따른 드레인 로직 최적화 및 연비와 운전안정성을 고려한 물 관리 전략 개발)

  • AHN, DEUKKUEN;LEE, HYUNJAE;SHIM, HYOSUB;KIM, DAEJONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.2
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    • pp.155-162
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    • 2016
  • A proton exchange membrane fuel cell (PEMFC) produces only water at cathode by an electrochemical reaction between hydrogen and oxygen. The generated water is transported across the membrane from the cathode to the anode. The transported water collected in water-trap and drained to the cathode within the humidifier outlet. If the condensate water is not being drained at the appropriate time, condensate water in the anode can cause the performance degradation or fuel efficiency degradation of fuel cell by the anode flooding or unnecessary hydrogen discharge. In this study, we proposed an optimization method of condensate water drain logic for the water drain performance and the water drain algorithm as considered the condensate water generating speed prep emergency case. In conclusion, we developed the water management strategy of fuel processing system (FPS) as securing fuel efficiency and operating stability.

A Study on the Efficiency Enhancement of the HT-PEMFC Having Fuel Processing System by Connecting Adsorption Chilling System (흡착식 냉방 시스템을 이용한 수소개질/연료전지 시스템의 효율향상)

  • NASEEM, MUJAHID;KIM, CHUL-MIN;LEE, SANGYONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.5
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    • pp.411-417
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    • 2019
  • An adsorption chiller is connected to the fuel processing/fuel cell system to increase the energy efficiency of the system. Since, the minimum temperature of $70^{\circ}C$ is needed to operate the adsorption chiller, HT-PEMFC is used as a heating source and $80^{\circ}C$ hot water in the water tank at the system is supplied to the chiller. Experimentally measured COP of the adsorption chiller was between 0.4-0.5 and the total calcuated efficiency of the connected system was between 60% and 70% comparing to 47% without adsorption chilling system.

Effect of Hydrogen Purge Mode on the Polymer Electrolyte Membrane Fuel Cell (PEMFC) Performance under Dead-ended Anode Operation (양극 닫힌계 작동에서 수소 배출 방법에 의한 고분자전해질 연료전지 성능 영향)

  • Kim, Junseob;Kim, Junbom
    • Applied Chemistry for Engineering
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    • v.30 no.6
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    • pp.687-693
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    • 2019
  • As the hydrogen fuel cell market is expanded starting from hydrogen electric vehicle and power generation field, the demand for fuel cells and hydrogen increases recently. Therefore, research works on fuel cell durability and fuel efficiency are required in order to activate the fuel cell market and commercialization. A dead-ended anode system was used in this study to optimize the fuel cell performance and fuel efficiency. The effect of purge condition according to the applied current and hydrogen supply pressure on the fuel cell performance were evaluated. In addition, the influence of water back diffusion on the different electrolyte membrane thickness was analyzed. The accumulated water was purged with a solenoid valve in the case of 3% voltage decrease in the dead-ended anode system. The experiment was performed with the hydrogen supply pressure of 0.1~0.5 bar and purge duration of 0.1~1 second. A maximum fuel efficiency of 98.9% was achieved under the purge duration of 0.1 s and hydrogen supply pressure of 0.1 bar with a NR 211 (25.4 um) membrane. However, the fuel cell performance decreased in a long-term operation due to some frequent flooding. The fuel efficiency and purge interval increased due to decreased back diffusion rates of the water and nitrogen with a NR 212 (50.8 um) membrane.

Estimation of Gasoline Price Elasticities of Demand for Automobile Fuel Efficiency in Korea : A Hedonic Approach (휘발유 가격변화에 대한 자동차 연비의 수요탄력성 추정 - 대구시를 대상으로 헤도닉기법을 이용하여 -)

  • Lee, Sung Tae;Lee, Myunghun
    • Environmental and Resource Economics Review
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    • v.10 no.1
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    • pp.45-64
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    • 2001
  • This paper estimates the gasoline price elasticities of demand for automobile fuel efficiency in Korea to examine indirectly whether the government policy of raising fuel prices is effective in inducing less consumption of fuel, relying on a hedonic technique developed by Atkinson and Halvorsen (1984). One of the advantages of this technique is that the data for a single year, without involving variation in the price of gasoline, is sufficient in implementing this study. Moreover. this technique enables us to circumvent the multicollinearity problem, which had reduced reliability of the results in previous hedonic studies. The estimated elasticities of dam and for fuel efficiency with respect to the price of gasoline, on average, is 0.42.

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Electric power generation from treatment of food waste leachate using microbial fuel cell

  • Wang, Ze Jie;Lim, Bong Su
    • Environmental Engineering Research
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    • v.22 no.2
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    • pp.157-161
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    • 2017
  • Simultaneous treatment of food waste leachate and power generation was investigated in an air-cathode microbial fuel cell. A TCOD removal efficiency of $95.4{\pm}0.3%$ was achieved for an initial COD concentration of 2,860 mg/L. Maximum power density ranged was maximized at $1.86W/m^3$, when COD concentration varied between 60 mg/L and 2,860 mg/L. Meanwhile, columbic efficiency was determined between 1.76% and 11.07% for different COD concentrations. Cyclic voltammetric data revealed that the oxidation peak voltage occurred at -0.20 V, shifted to about -0.25 V. Moreover, a reduction peak voltage at -0.45 V appeared when organic matters were exhausted, indicating that reducible matters were produced during the decomposition of organic matters. The results showed that it was feasible to use food waste leachate as a fuel for power generation in a microbial fuel cell, and the treatment efficiency of the wastewater was satisfied.