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Research on Engine Controll to Make Effective Use of Bioethanol-Blend Fuels

Article of Honda R&D Technical Review Vol.26 No.1

Summary

Research was carried out on engine systems and control that increase both thermal efficiency and maximum torque by making effective use of the limited ethanol content in E10 gasoline, which contains ethanol. Control that separates E10 gasoline into high octane number fuel (high-concentration ethanol) and low octane number fuel (low-concentration ethanol), using the ethanol effectively under conditions that tend to cause knocking during high-load operation and using mainly gasoline during low-load operation, was applied to a high-compression-ratio engine. A fuel management control logic was created so that, under this system, the basic characteristics of ignition timing and octane number (ethanol fraction) inside the cylinder are determined in accordance with the residual percentage of the fuel, and the gear ratio is cooperatively adjusted to yield an optimal engine speed and load matched to the engine's thermal efficiency at that time. Confirmation of this result in vehicle simulation indicated that in US06 mode, known to be an operating mode that generally is frequently under high load, the system is capable of operating without running short of ethanol. It also indicated that in a low-load operating mode such as the US combined mode, the system was capable of a maximum 26.8% increase in fuel economy through the effective use of separated ethanol.

Reference

(1) Cohn, D. R., Bromberg, L., Heywood, J. B.: Direct Injection Ethanol Boosted Gasoline Engines: Biofuel Leveraging for Cost Effective Reduction of Oil Dependence and CO2 Emissions, MIT LFEE Report 2005-001 (2005)
(2) Bromberg, L., Cohn, D. R., Heywood, J. B.: Calculations of Knock Suppression in Highly Turbocharged Gasoline/Ethanol Engines Using Direct Ethanol Injection, MIT LFEE Report 2006-001 (2006)
(3) Saiki, R., Nakajima, S., Nakashima, H., Miki, K., Oki, H., Goryozono, Y.: Development of 1.8L Flexible Fuel Vehicle System for 2007 Model Year CIVIC for Brazil, Honda R&D Technical Review, Vol. 19, No. 1, p. 13-20
(4) Kamio, J., Kurotani, T., Sato, T., Kiyohiro, Y., Hashimoto, K., Gunji, T.: A Study on Combustion Control by Dual-Fuel Strategies, JSAE Annual Congress Proceedings, No.55-07, p.19-22 (2007)
(5) Kuzuoka, K., Kubo, Y., Kurotani, T., Kamio, J., Kudo, H.: A Study on High Compression Ratio Engine by Effective Use of Bio-Ethanol, Internal Combustion Engine Symposium, 2012-C1-04
(6) Kudo, H., Kuzuoka, K., Kubo, Y., Chishima, H., Kurotani, T.: Research on Engine System making Effective Use of Bio-ethanol-blended Fuels, JSAE Annual Congress Proceedings, No.87-13, p.1-4 (2013)

Author (organization or company)

Tadashi KUROTANI(Automobile R&D Center)、Kohei KUZUOKA(Automobile R&D Center)、Hirotsugu KUDO(Automobile R&D Center)

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