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International journal of automotive technology 5건

  1. [국내논문]   A HYDROGEN FUELLED V-8 ENGINE FOR CITY-BUS APPLICATION  

    Sierens, R. (Laboratory of Transporttechnology, University of Gent ) , Verhelst, S. (Laboratory of Transporttechnology, University of Gent, Belgium)
    International journal of automotive technology v.2 no.2 ,pp. 39 - 45 , 2001 , 1229-9138 ,

    초록

    Hydrogen is seen as one of the important energy vectors of the next century. Hydrogen as a renewable energy source, provides the potential for a sustainable development particularly in the transportation sector. Hydrogen driven vehicles reduce both local as well as global emissions. The laboratory of transporttechnology (University of Gent) converted a GM/Crusader V-8 engine for hydrogen use. Once the engine is optimised, it will be built in a low-floor midsize hydrogen city bus for public demonstration. For a complete control of the combustion process and to increase the resistance to backfire (explosion of the air-fuel mixture in the inlet manifold), a sequential timed multipoint injection of hydrogen and an electronic management system is chosen. The results as a function of the engine parameters (ignition timing. injection timing and duration, injection pressure) we given. Special focus is given to topics related to the use of hydrogen as a fuel: ignition characteristics (importance of electrode distance), quality of the lubricating oil (crankcase gases with high contents of hydrogen), oxygen sensors (very lean operating conditions), noise reduction (configuration and length of inlet pipes). The advantages and disadvantages of a power regulation only by the air to fuel ratio (as for diesel engines) against a throttle regulation (normal gasoline or gas regulation) are examined. Finally the goals of the development of the engine are reached: power output of 90 kW, torque of 300 Nm, extremely low emission levels and backfire-safe operation.

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  2. [국내논문]   THE STATE OF THE ART OF THE INTERNAL PLASMA SPRAYING ON CYLINDER BORE IN AlSi CAST ALLOYS  

    Barbezat, G. (Sulzer Metco AG)
    International journal of automotive technology v.2 no.2 ,pp. 47 - 52 , 2001 , 1229-9138 ,

    초록

    For the wear protection of cylinder bore in aluminum cast material the internal plasma spraying technology offers a new economical solution. The size and the weight of the engine blocks significantly can be decreased in comparison with the traditional cast iron sleeves. The coefficient of friction between piston ring and cylinder wall sensitively can be reduced and the wear resistance increased from several factors. The paper gives an overview of the technology from the AlSi cast alloys for engine block to the non destructive testing technology used after the machining by diamond honing. The actual results in engines of different types also will be shown. The economical advantages of the plasma spraying (or the internal coating in cylinder bore also will be discussed in comparison with the different alternatives of technology. The aspect of the market introduction also will be discussed in this paper.

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  3. [국내논문]   ENGINE CONTROL USING COMBUSTION MODEL  

    Ohyama, Y. (Hitachi Car Engineering Co., Ltd.)
    International journal of automotive technology v.2 no.2 ,pp. 53 - 62 , 2001 , 1229-9138 ,

    초록

    The combination of physical models of an advanced engine control system was proposed to obtain sophisticated combustion control in ultra-lean combustion, including homogeneous compression-ignition and activated radical combustion with a light load and in stoichiometric mixture combustion with a full load. Physical models of intake, combustion and engine thermodynamics were incorporated, in which the effects of residual gas from prior cycles on intake air mass and combustion were taken into consideration. The combined control of compression ignition at a light load and sparit ignition at full load for a high compession ratio engine was investigated using simulations. The control strategies of the variable valve timing and the intake pressure were clarified to keep auto-ignition at a light load and prevent knock at a full load.

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  4. [국내논문]   AN EXPLORATORY STUDY OF THE EMISSION REDUCTION TECHNOLOGIES COMPLIANT WITH SULEV REGULATIONS  

    Kim, In Tak (Research & Development Division of Hyundai Motor Company & Kia Motors Corporation ) , Lee, Woo Jik (Research & Development Division of Hyundai Motor Company & Kia Motors Corporation ) , Yoon, Jong Seok (Research & Development Division of Hyundai Motor Company & Kia Motors Corporation ) , Park, Chung Kook (Research & Development Division of Hyundai Motor Company & Kia Motors Corporation)
    International journal of automotive technology v.2 no.2 ,pp. 63 - 75 , 2001 , 1229-9138 ,

    초록

    This paper describes the development of THC reduction technologies compliant with SULEV regulations. Technologies embodied by the developmental work include improvement of fuel spray atomization, quick warm-up through coolant control shut of, and acceleration of fuel atomization for the fast rise of cylinder head temp inside the water jacket as well as the improvement of combustion state. The technologies likewise entail reduced HC while operating in lean A/F condition during engine warm-up with the cold lean burn technology, individual cylinder A/F control for improvement of catalytic converting efficiency, after-treatment such as thin-wall catalyst, HC-adsorber and EHC and etc, through vehicle application evaluation in cold start. We carried out an experimental as well as a practical study against SULEV regulations, and the feasibility of adopting these items in vehicle was likewise investigated.

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  5. [국내논문]   EFFECT OF ETHENE $(C_2 H_4)$ ON THE PLASMA $DeNO_X$ PROCESS FROM DIESEL ENGINE EXHAUST  

    Park, Kwang-Seo (Dongyang Tecynical College ) , Kim, Dong-Inn (Yonsei University ) , Lee, Hyeong-Sang (Yonsei University ) , Chun, Bae-Hyeock (Blue Planet Ltd. ) , Yoon, Woong-Sup (Yonsei University ) , Chun, Kwang-Min (Yonsei University)
    International journal of automotive technology v.2 no.2 ,pp. 77 - 83 , 2001 , 1229-9138 ,

    초록

    Effect of ethene on the $DeNO_X$ conversion process in a simulated diesel engine operating conditions was investigated experimentally and theoretically. With the addition of even a small amount of ethene the NO to $NO_2$ conversion enhances greatly. The energy required to convert one NO molecule is 27 eV with 250 ppm ethene added, while 137 eV without ethene at 473 K. The effect of energy density, temperature, and the initial concentrations of ethene and oxygen are also discussed and the results show that the increase of the mentioned parameters lead to the promotion of NO oxidation. A kinetic model used in this study shows good agreement with the experimental result. Byproducts like formaldehyde ( $CH_2$ 0) and methyl nitrite ( $CH_3$ ONO) predicted by model calculation are broken up into CO and $H_2O$ eventually when high energy is delivered to the gas mixture. Sensitivity analysis shows that the main reactions of NO oxidation when ethene is added we: $HO_2+ NO \arrow NO_2 + OH, RO_2 + NO \arrow NO_2 + RO$ , where R is a hydrocarbon radical. Also the direct oxidizing reaction of NO with O cannot be neglected.

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