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Kurotani, Tadashi
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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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A Study on Combustion Control by Dual-Fuel Strategies

Honda R&D Co., Ltd.-Junichi Kamio, Tadashi Kurotani, Takuya Sato, Yukihiko Kiyohiro, Kohtaro Hashimoto, Takahiro Gunji
  • Technical Paper
  • 2007-08-0242
Published 2007-05-23 by Society of Automotive Engineers of Japan in Japan
This work explores the potential of combustion control by dual-fuel strategies using combinations of gasoline, ethanol and diethyl-ether which are produced from ethanol. Steady state characteristics and transient operation of HCCI/SI 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 demonstrated that the strategies involve the potential for optimizing ignition timing of HCCI combustion and suppressing knock in SI combustion with fixed compression ratio. Feedforward and feedback control systems allowed the transient operation including HCCI-SI-HCCI combustion transition and re-ignition in HCCI combustion.