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Enhancement of Low-temperature Combustion in Flexible Fuel Vehicle (FFV) Engine

Article of Honda R&D Technical Review Vol.22 No.2


A variety of vegetable oil-based alternative fuels have been suggested in recent years with a view to preventing global warming due to the CO2 emitted by internal combustion engines. One of those fuels is bio-ethanol. Flexible fuel vehicles (FFV) that are able to run on varieties ranging from 100% aqueous ethanol (E100) to a 22% mixture of ethanol with gasoline (E22) are in use in Brazil. Ethanol is a single-component fuel that does not contain any low-boiling-point components, and there are issues with combustion at low temperatures. The optimum compression ratio was selected to enhance the combustion of ethanol at low temperatures. The flow was also raised and low-temperature combustion was enhanced by operating with one intake valve. In order to raise the commercial product appeal when using E100 at low temperatures, a new engine control was built exclusively for the FFV. Through the use of these technologies, a dedicated FFV engine was developed that achieves a balance of commercial product appeal and power output when using E100.


(1) 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, April, 2007, p. 13-20

Author (organization or company)

Susumu NAKAJIMA(Automobile R&D Center)