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Kuzuoka, Kohei
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Effect of Mixture Stratification and Fuel Reactivity on Dual-Fuel Compression Ignition Combustion Process for SI-Based Engine

Honda R&D Co., Ltd.-Kohei Kuzuoka, Junichi Kamio, Kohtaro Hashimoto
Published 2016-10-17 by SAE International in United States
Compression ignition combustion with a lean mixture has high potential in terms of high theoretical thermal efficiency and low NOx emission characteristics due to low combustion temperatures. In particular, a Dual-Fuel concept is proposed to achieve high ignition timing controllability and an extended operation range. This concept controls ignition timing by adjusting the fraction of two fuels with different ignition characteristics. However, a rapid combustion process after initial ignition cannot be avoided due to the homogenous nature of the fuel mixture, because the combustion process depends entirely on the high reaction rate of thermal ignition.In this study, the effect of mixture stratification in the cylinder on the combustion process after ignition based on the Dual-Fuel concept was investigated. Port injection of one fuel creates the homogeneous mixture, while direct injection of the other fuel prepares a stratified mixture in the cylinder at the compression stroke. The difference in equivalence ratio of the stratified mixture and fuel properties of each specific fuel results in sequential ignition. Thus, the heat release rate is lower; in other words,…
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Study of Ethanol-Gasoline Onboard Separation System for Knocking Suppression

Honda R&D Co., Ltd.-Hiroshi Chishima, Kohei Kuzuoka, Tadashi Kurotani, Hirotsugu Kudo
Published 2015-09-01 by SAE International in United States
Bio-ethanol is used worldwide in fuel mixtures such as E10 gasoline. In this study, an onboard fuel system employing a pervaporation membrane was investigated to separate E10 into high-octane-number fuel (high-concentration ethanol fuel) and low-octane-number fuel (low-concentration ethanol fuel). The optimal operation conditions and size of the membrane unit for the separation system were determined in consideration of the separation rate and vehicle installation. This system can supply separated ethanol with sufficient speed and quantity to improve engine performance under practical driving conditions. In addition, the study was conducted to confirm that separated fuels have properties sufficient for use in automobiles. This separation rate enabled 5-cycle-mode driving without temporary shortage of permeated fuel.
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Study of High-Compression-Ratio Engine Combined with an Ethanol-Gasoline Fuel Separation System

SAE International Journal of Engines

Honda R&D Co., Ltd.-Kohei Kuzuoka, Tadashi Kurotani, Hiroshi Chishima, Hirotsugu Kudo
  • Journal Article
  • 2014-01-2614
Published 2014-10-13 by SAE International in United States
Bio-ethanol is used in many areas of the world as ethanol blended gasoline at low concentrations such as “E10 gasoline”. In this study, a method was examined to effectively use this small amount of ethanol within ethanol blended gasoline to improve thermal efficiency and high-load performance in a high-compression-ratio engine. Ethanol blended gasoline was separated into high-concentration ethanol fuel and gasoline using a fuel separation system employing a membrane. High-ethanol-concentration fuel was selectively used at high-load conditions to suppress knocking. In this system, a method to decrease ethanol consumption is necessary to cover the wide range of engine operation. Lower ethanol consumption could be achieved by Miller-cycle operation because decrease of the effective compression ratio suppresses knocking. However, high-load operation was limited due to the decrease in intake air volume with Miller-cycle operation. To solve this problem, conventional Otto-cycle operation is used in high-load conditions, utilizing large quantities of ethanol injection to avoid knocking. The two different cycles were smoothly switched with innovative application of a variable valve timing system. In summary, optimum control of…
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Study on HCCI-SI Combustion Using Fuels Ethanol Containing

Honda R&D Co., Ltd.-Junichi Kamio, Tadashi Kurotani, Kohei Kuzuoka, Yasuyuki Kubo, Hiroyoshi Taniguchi, Kohtaro Hashimoto
Published 2007-10-29 by SAE International in United States
Bio-ethanol is one of the candidates for automotive alternative fuels. For reduction of carbon dioxide emissions, it is important to investigate its optimum combustion procedure. This study has explored effect of ethanol fuels on HCCI-SI hybrid combustion using dual fuel injection (DFI). Steady and transient characteristics of the HCCI-SI hybrid combustion were evaluated using a single cylinder engine and a four-cylinder engine equipped with two port injectors and a direct injector. The experimental results indicated that DFI has the potential for optimizing ignition timing of HCCI combustion and for suppressing knock in SI combustion under fixed compression ratio. The HCCI-SI hybrid combustion using DFI achieved increasing efficiency compared to conventional SI combustion. Feed-forward and feed-back control systems based on DFI enabled the transient operation including acceleration and deceleration during HCCI combustion, re-ignition of HCCI combustion after fuel cut mode, HCCI-SI-HCCI combustion transition, and suppression of knock in SI combustion.
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